Wellhead leakage alarm device, early warning method and wellhead intelligent leakage prevention system

Abstract

The present invention relates to the field of oil and gas technology, and is a wellhead leakage alarm device, an early warning method, and an intelligent wellhead leakage prevention system. The wellhead leakage alarm device comprises a leakage sensor, a reversible battery, a control unit, and a storage box. The upper end of the storage box is provided with a sucker rod hole for installing a sucker rod. The present invention has a reasonable and compact structure. When the packing is punctured on site, the produced fluid splashes onto the sensing surface of the leakage sensor through the gap between the sucker rod and the packing gland. The leakage sensor sends a signal to the control unit, and the control unit sends a prompt message of the leakage. The operator inspects the wellhead according to the prompt message. The device is suitable for wellhead leakage under various working conditions, can meet the needs of oil fields to promote the construction of intelligent oil fields, can timely warn of the risk of oil well wellhead leakage, reduce the occurrence of wellhead pollution events, realize unmanned operation, provide technical support for the development of green oil fields, and has good prospects for promotion and application.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum and natural gas, and relates to a wellhead leakage alarm device, an early warning method and a wellhead intelligent leakage prevention system. Background Art

[0002] In the daily production and operation of oil fields, the wellhead is required to maintain a sealed state to ensure safe production and prevent environmental pollution caused by leakage, bubbling, puncture and leaking. In the process of mechanical oil production, when the wire rope of the pumping unit reciprocates up and down on the sucker rod, the movement trajectory is uncertain due to the large load change of the sucker rod, and the friction between the sucker rod and the packing is uncertain. In addition, the influence of other factors makes the wellhead sealing packing wear more likely, and the wellhead packing seal leakage often occurs.

[0003] At present, oil production inspection personnel rely on on-site inspections to discover leaks. Once discovered, the packing is tightened or replaced to eliminate the leak. The packing leakage cycle of each well ranges from a few days to dozens of days. Due to the irregular nature of packing leakage, it is necessary to strengthen on-site inspections. With the increase in the number of wells managed by oil production inspection posts, the management difficulty caused by the leakage of packing at the wellhead of the pumping well has become more prominent.

[0004] A Chinese patent document with publication number CN118110461A discloses a wellhead packing leakage monitoring device, which includes an oil receiving box, a photoelectric sensor, an alarm device and a control unit. The oil receiving box is hollow and cylindrical with an opening upward. A mounting hole is provided in the center of the bottom of the oil receiving box, and at least two oil unloading switches are radially provided on the outer side of the lower part of the oil receiving box. A connecting piece is provided on the inner side of the oil receiving box, and a photoelectric sensor with a sensing probe spaced from the bottom of the oil receiving box is provided on the connecting piece. The photoelectric sensor is connected to the control unit and the alarm device respectively. When the wellhead packing leaks, the leaked liquid enters the inner side of the oil receiving box. When the liquid submerges the photoelectric sensor, the induction red light on the photoelectric sensor goes out. After the alarm device senses that the red light goes out, it starts to alarm. The wellhead packing leakage monitoring device can only use the photoelectric sensor to start the alarm when the wellhead packing leaks, and cannot be used when the wellhead packing has a puncture leakage phenomenon, that is, it cannot be used to warn in the early stage of the wellhead leakage. In this way, eliminating the leakage problem when the leakage occurs will increase the difficulty and risk of the operation.

[0005] A Chinese patent document with a publication number of CN216922072U discloses a manual switch device for a ram blowout preventer of an oil well, which includes a gear assembly, wherein the gear assembly includes a first main shaft and a second main shaft, wherein the first main shaft passes through a center hole of a first driving wheel and is transmission-connected to the first driving wheel, and the second main shaft passes through a center hole of a second driving wheel and is transmission-connected to the second driving wheel; the first main shaft is fixedly connected to one side of a steering gear, and the other side of the steering gear is fixedly connected to the second main shaft through a connecting assembly; the first driving wheel and the second driving wheel are meshed and transmission-connected with a first driven wheel and a second driven wheel respectively; and both ends of the ram blowout preventer are respectively matched and connected with the first driven wheel and the second driven wheel. Although the oil well gate blowout preventer can use the manual switch device to achieve synchronous opening and closing of the valve cores on both sides of the gate blowout preventer through the first driven wheel and the second driven wheel, when the light rod is in an eccentric position, the valve cores on both sides cannot straighten the light rod, so that the valve core is squeezed on the outside of the light rod and the blowout preventer cannot be closed normally. In addition, when a blowout accident occurs, manually closing the gate blowout preventer has a safety hazard and the blowout preventer cannot be closed in time. In addition, the connection between the first driven wheel, the second driven wheel and the gate blowout preventer requires a longer valve stem, which is not convenient for subsequent maintenance operations.

[0006] The Chinese patent document with the announcement number CN215256116U discloses an automatic pressure-adjusting polished rod sealing device, which includes: a driving device; a torque-fixing device for adjusting the torque, including: a rotating shaft, one end of which is connected to the output end of the driving device; a chassis, which is fixed on the rotating shaft, and the bottom surface of the chassis abuts against the shoulder of the rotating shaft; a housing, which is fixed on the rotating shaft and is located above the chassis; a second gear, which is fixed on the rotating shaft and is located in the housing; a double gear, which is fixed on the rotating shaft and is located above the second gear, and the upper wheel of the double gear is fixed with a A flange bearing, the flange bearing is mounted on the end of the rotating shaft away from the driving device; there are two adjusting mechanisms, which are symmetrically arranged on the side of the housing, and one end of the adjusting mechanism is against the second gear and the double gear; a transmission device is used to transmit power and compress the packing cap, including: a first gear, which is mounted on the packing box, and the first gear is meshed with the upper wheel of the double gear; a threaded barrel, which is mounted on the packing box and fixed above the first gear; a packing cap, which is threadedly connected above the threaded barrel; and a guide member, which vertically penetrates the packing cap and is connected to the packing box. The automatic pressure-adjusting light rod sealing device has high requirements on the assembly accuracy between the threaded barrel and the packing cap. If the assembly accuracy is low, during use, the inner side of the threaded barrel is prone to wear with the outer side of the packing box, and the wear debris will affect the service life of the second thrust bearing, causing the entire transmission device to fail and increase the maintenance frequency.

[0007] At present, the wellhead alarm devices all start to alarm after leakage occurs at the wellhead, and cannot give early warning of puncture leakage at the wellhead. Once the leakage is discovered, it will be delayed and cause a large amount of leakage, which will bring great safety risks and environmental pollution problems. Subsequent disposal and recovery will also affect the normal development of various work of the enterprise. After the leakage occurs, the wellhead packing is generally tightened by the operating personnel without stopping the machine to prevent and stop the packing from continuing to leak. This operation is affected by the number of wellhead equipment managed by the employees and the operating experience of the personnel. There are many uncertain factors in the timeliness of the operation, and oil leakage and environmental pollution at the wellhead cannot be effectively prevented. Summary of the invention

[0008] The present invention provides a wellhead leakage alarm device, an early warning method and an intelligent wellhead leakage prevention system, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing wellhead alarm device is unable to give an early warning of wellhead leakage, thus causing a large leakage once the leakage is discovered late, bringing great safety risks and environmental pollution.

[0009] One of the technical solutions of the present invention is achieved through the following measures: a wellhead leakage alarm device, including a leakage sensor, a reversible battery, a control unit and a storage box, a sucker rod hole for installing a sucker rod is provided at the upper end of the storage box, a leakage sensor is fixedly installed on the inner side of the lower part of the storage box, a collection hole connected inside and outside is provided on the inner side of the lower part of the storage box corresponding to the position above the leakage sensor, an explosion-proof box is installed on the outer side of the upper part of the storage box corresponding to the position of the collection hole, a plurality of photoelectric panels are fixedly installed on the outer side of the explosion-proof box, a solar controller, a reversible battery and a liquid level sensor with the end passing through the inner side of the explosion-proof box and the collection hole are arranged at intervals in the explosion-proof box, the plurality of photoelectric panels are connected to the solar controller, the solar controller is respectively connected to the reversible battery and the control unit, and the control unit is respectively connected to the leakage sensor and the liquid level sensor.

[0010] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions:

[0011] The above-mentioned liquid level sensor can simultaneously detect the liquid level and the mineralization degree of the produced liquid, and also includes a monitoring frame and a camera fixedly installed on the upper outer side of the monitoring frame. A receiving module is fixedly installed on the lower side of the camera. A transmitting module and a processing module are fixedly installed at intervals in the explosion-proof box. The transmitting module is connected to the receiving module, and the processing module is respectively connected to the camera and the receiving module. The transmitting module and the processing module are both connected to the control unit.

[0012] The second technical solution of the present invention is achieved by the following measures: a wellhead early warning method, S1, a storage box is fixedly installed on the upper end of the packing gland, so that the sucker rod passes through the sucker rod hole, and a sealing ring is installed inside the sucker rod hole;

[0013] S2, fix the explosion-proof box and the storage box together, and fix the monitoring frame on one side of the wellhead;

[0014] S3, start the wellhead leakage alarm device, and the leakage sensor and liquid level sensor collect liquid data in the storage box;

[0015] When the produced fluid splashes onto the surface of the leakage sensor in the storage box, the leakage sensor sends a leakage instruction to the control unit, the control unit sends a start instruction to the transmitting module, the transmitting module sends a signal to the receiving module, the receiving module sends a signal to the processing module, the processing module collects the image information of the upper outer side of the storage box through the camera, and judges whether the packing gland is leaking according to the image information. If leakage occurs, the processing module will send a first-level warning signal to the control unit;

[0016] When the produced fluid leaks and flows into the storage box, and the liquid level sensor determines that the liquid level of the produced fluid flowing into the storage box is greater than or equal to the set value, a secondary warning signal is sent to the control unit;

[0017] When the produced fluid leaks and flows into the storage box, and the liquid level sensor determines that the liquid level and the salinity value of the produced fluid flowing into the storage box are both greater than or equal to the set value, the liquid level sensor sends a third-level warning signal to the control unit;

[0018] S4, the control unit releases alarm information based on the warning signal reception time and the warning signal level.

[0019] The following is a further optimization and / or improvement of the second technical solution of the above invention:

[0020] In the above step S4, the control unit issues alarm information based on the warning signal reception time and the warning signal level, including:

[0021] When the control unit receives the first-level warning signal at time t1, the control unit issues a wellhead leakage warning and inspection prompt information;

[0022] When the control unit receives the second-level warning signal at time t2, it determines the time when the control unit receives the third-level warning signal, marks it as time t3, and determines whether time t3 is less than or equal to t2+K, where K is the time setting value. If so, the control unit issues a wellhead leakage alarm message, and determines the wellhead leakage speed information based on the time difference between time t3 and time t2, and issues an alarm message;

[0023] If not, the control unit sends a reminder message to clean the water accumulated in the wellhead storage box.

[0024] The third technical solution of the present invention is achieved through the following measures: a wellhead intelligent leak prevention system, including a wellhead leakage alarm device, a packing gland, a first sealing valve core, a second sealing valve core, a first drive assembly, a second drive assembly and a cross-shaped valve body, a sucker rod mounting hole which passes through the upper and lower parts of the valve body is provided in the center of the upper end of the valve body, a sealing packing is provided on the inner side of the upper part of the valve body, a compression sleeve is installed on the upper end of the sealing packing, a packing gland is screwed on the outer side of the upper end of the valve body, a first drive assembly is provided on the outer side of the upper part of the valve body, which can make the packing gland rotate and then compress the sealing packing through the compression sleeve, the lower end of the storage box of the wellhead leakage alarm device is fixedly installed on the upper end of the packing gland, the sucker rod hole and the sucker rod mounting hole are connected to each other, and the lower part of the valve body The left end is provided with a first sealing hole, the right end of which is connected with the sucker rod mounting hole, and the right end of the valve body corresponding to the position of the first sealing hole is provided with a second sealing hole, the left end of the valve body being connected with the sucker rod hole, the first sealing hole is provided with a first sealing valve core, the right end of the first sealing valve core is provided with a first sealing groove which runs through the oil pumping rod, the second sealing hole is provided with a second sealing valve core, and the left end of the second sealing valve core is provided with a second sealing groove which runs through the oil pumping rod, and the first sealing valve core and the second sealing valve core can form a sucker rod sealing hole matching the sucker rod when they contact each other, and the outer side of the lower part of the valve body is provided with a second driving assembly which can make the first sealing valve core and the second sealing valve core approach or move away from each other, and the first driving assembly and the second driving assembly are both connected to the control unit.

[0025] The following is a further optimization and / or improvement of the third technical solution of the above invention:

[0026] The above-mentioned first drive assembly may include a support plate, a first drive motor, an adjusting screw and a self-tightening driving gear. The left outer side and the right outer side of the valve body corresponding to the position below the packing gland are provided with symmetrically distributed left mounting steps and right mounting steps. The upper side of the front of the support plate is provided with a mounting hole that passes through from top to bottom. The left inner wall and the right inner wall of the mounting hole are both vertical surfaces, and the distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left mounting step and the right mounting step. The support plate is seated on the left mounting step and the right mounting step. The front side of the support plate is provided with an adjusting screw hole that passes through from front to back. The front side of the valve body corresponding to the position of the adjusting screw hole is provided with a limiting screw hole. The adjusting screw hole is threaded with an adjusting screw that is threaded with the rear outer side in the limiting screw hole. The first drive motor is fixedly installed on the lower side of the rear of the support plate. The output shaft of the first drive motor passes through the upper side of the support plate and is fixedly installed with the self-tightening driving gear. The outer side of the lower part of the packing gland is detachably fixed with a self-tightening driven gear that meshes with the outer side of the upper part of the self-tightening driving gear. The first drive motor is connected to the control unit.

[0027] The left end of the above-mentioned second sealing valve core can be provided with an arc-shaped guide groove which passes through from top to bottom and opens to the left. The right part of the guide groove is connected to the left part of the second sealing groove. The right end of the first sealing valve core corresponding to the front and rear positions of the first sealing groove is fixedly installed with a guide part. The first sealing groove, the guide part and the second sealing groove can form a sucker rod sealing hole.

[0028] A first sealing end cover can be fixedly installed on the left end of the lower part of the valve body, a left threaded hole is provided in the center of the first sealing end cover, a left valve stem whose right end is fixedly installed with the first sealing valve core is threadedly connected in the left threaded hole, the left end of the left valve stem is installed with the corresponding position of the second driving assembly, a first sealing sleeve which is sleeved on the outer side of the left part of the left valve stem is fixedly installed on the left end of the first sealing end cover, a first sealing packing is sleeved in the first sealing sleeve, a first compression sleeve is installed on the left end of the first sealing packing, a first sealing gland is threadedly connected to the outer side of the first sealing sleeve, and the inner side of the left part of the first sealing gland abuts against the left end of the first compression sleeve;

[0029] A second sealing end cover is fixedly installed on the right end of the lower part of the valve body, and a right threaded hole is provided in the center of the second sealing end cover, and a right valve stem whose left end is fixedly installed with the second sealing valve core is threadedly connected in the right threaded hole, and the right end of the right valve stem is installed together with the corresponding position of the second driving assembly, and a second sealing sleeve which is sleeved on the outer side of the right part of the right valve stem is fixedly installed on the right end of the second sealing end cover, and a second sealing packing is sleeved in the second sealing sleeve, and a second compression sleeve is installed on the right end of the second sealing packing, and a second sealing gland is threadedly connected to the outer side of the second sealing sleeve, and the inner side of the right part of the second sealing gland abuts against the right end of the second compression sleeve.

[0030] As a preferred embodiment, the second drive assembly may include a fixed seat, a reducer, a second drive motor, a first driving gear and a second driving gear. A fixed seat is fixedly installed on the outer side of the lower part of the valve body, a reducer is fixedly installed on the front side of the fixed seat, a second drive motor is fixedly installed on the front side of the reducer, a rear end of the output shaft of the second drive motor is driven and installed together with an input shaft of the reducer, a reduction box fixedly installed in the fixed seat is provided on the rear side of the reducer, a driving bevel gear is fixedly installed on the rear end of the output shaft of the reducer after passing through the front side of the reduction box, a left rotating hole and a right rotating hole are respectively provided on the left and right sides of the reduction box, and the first output shaft is rotatably installed in the left rotating hole. A first driven bevel gear meshing with the left portion of the driving bevel gear is fixedly installed on the outer side of the right end of the first output shaft, a first driving gear is fixedly installed on the outer side of the left end of the first output shaft, a first driven gear meshing with the left portion of the first driving gear is fixedly installed on the outer side of the left portion of the left valve stem, a second output shaft is rotatably installed in the right rotating hole, a second driven bevel gear meshing with the right portion of the driving bevel gear is fixedly installed on the outer side of the left end of the second output shaft, a second driving gear is fixedly installed on the outer side of the right end of the second output shaft, a second driven gear meshing with the right portion of the second driving gear is fixedly installed on the outer side of the right portion of the right valve stem, and a second drive motor is connected to the control unit.

[0031] The above-mentioned left valve stem may include a connecting plate and a pull rod. The outer side of the right part of the pull rod is screwed into the left threaded hole. A circular connecting plate is fixedly installed on the left end of the first sealing valve core. A connecting groove opening to the left is provided on the left end of the connecting plate. The connecting groove includes a disassembly section and a rotation section. The disassembly section is in an arc shape opening downward, and the rotation section is in a U shape opening upward. The lower part of the disassembly section and the upper part of the rotation section are connected to each other. A right limiting ring platform rotatably installed on the inner side of the lower part of the rotating section is fixed on the outer side of the right end of the pull rod. A U-shaped limiting platform opening upward is fixed on the inner side of the left part of the rotating section corresponding to the left end position of the right limiting ring platform. A ring-shaped left limiting ring platform is fixedly installed on the outer side of the right part of the pull rod at the position between the left side of the limiting platform and the right side of the first sealing end cover. The first driven gear is fixedly installed on the outer side of the left part of the pull rod on the left side of the first sealing pressure cover. The right valve stem has the same structure as the left valve stem and is symmetrically arranged.

[0032] The above-mentioned second drive assembly may also include a first control module, a left connecting frame is fixedly installed on the left end of the first sealing end cover, and a first travel switch and a second travel switch are fixedly installed in the left connecting frame corresponding to the left and right positions of the first driving gear, respectively. The first travel switch and the second travel switch are both connected to the first control module, and the first control module is respectively connected to the first drive motor, the second drive motor, and the control unit.

[0033] As another preferred embodiment, the second drive assembly may include a left drive component, a right drive component and a second control module, the left drive component includes a left drive motor and a first mounting bracket, the left valve stem includes a first push rod, a first top plate and a first push rod, the outer side of the right portion of the first push rod is screwed into the left threaded hole, a left mounting groove with an opening to the left is provided at the center of the left end of the first sealing valve core, the first push rod is installed in the left mounting groove, the first top plate which is clamped together with the right end of the first push rod is fixedly installed at the left end of the first push rod, the first mounting bracket is fixedly installed at the left end of the first sealing end cover, the left drive motor is fixedly installed at the left end of the first mounting bracket, and the right end of the output shaft of the left drive motor is drivingly connected to the left end of the first push rod;

[0034] The right driving assembly includes a right driving motor and a second mounting bracket, the right valve stem includes a second push rod, a second top plate and a second push rod, the left outer side of the second push rod is screwed into the right threaded hole, a right mounting groove opening to the right is provided in the center of the right end of the second sealing valve core, the second push rod is installed in the right mounting groove, the right end of the second push rod is fixedly mounted with a second top plate clamped together with the left end of the second push rod, the right end of the second sealing end cover is fixedly mounted with a second mounting bracket, the right end of the second mounting bracket is fixedly mounted with the right driving motor, the left end of the output shaft of the right driving motor is transmission-connected with the right end of the second push rod, the control unit is connected with the second control module, and the second control module is respectively connected with the first driving motor, the left driving motor and the right driving motor.

[0035] The structure of the present invention is reasonable and compact. When the packing is leaking on site, the produced fluid splashes onto the sensing surface of the leakage sensor through the gap between the sucker rod and the packing gland. The leakage sensor sends a signal to the control unit, and the control unit sends a prompt message of the leakage. The operating personnel inspect the wellhead according to the prompt message, and can issue an early warning after the wellhead leaks, thus avoiding a large leakage when leaking, which brings great safety risks and hidden dangers of environmental pollution. The leakage can be handled in time, and the difficulty of handling the leakage in the early stage of leakage is also relatively low. Only the packing gland needs to be tightened. At this time, the leakage of produced fluid is small, which can reduce further pollution to the wellhead environment. The device is suitable for wellhead leakage under various working conditions, can meet the needs of oil fields to promote the construction of intelligent oil fields, can timely warn of the risk of oil well wellhead leakage, reduce the occurrence of wellhead pollution incidents, realize unmanned operation, provide technical support for the development of green oil fields, and has good prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Attached Figure 1 This is a schematic diagram of the main structure of the first embodiment of the present invention when in use.

[0037] Attached Figure 2 It is a schematic diagram of the left-side structure when the first embodiment of the present invention is used.

[0038] Attached Figure 3 It is a schematic diagram of the right side cross-sectional structure when the first embodiment of the present invention is used.

[0039] Attached Figure 4 This is a schematic diagram of the circuit structure of the second embodiment of the present invention.

[0040] Attached Figure 5 This is a flow chart of the method of embodiment 3 of the present invention.

[0041] Attached Figure 6 This is a schematic diagram of the main structure of the fourth embodiment of the present invention when in use.

[0042] Attached Figure 7 This is a schematic diagram of the left-side structure when the fourth embodiment of the present invention is used.

[0043] Attached Figure 8 This is a schematic diagram of the main cross-sectional structure of the fourth embodiment of the present invention when in use.

[0044] Attached Fig. 9 The three-dimensional structure of the fourth embodiment of the present invention is shown in FIG. Figure 1 .

[0045] Attached Fig.10 The three-dimensional structure of the fourth embodiment of the present invention is shown in FIG. Figure 2 .

[0046] Attached Fig.11This is a schematic diagram of the three-dimensional structure when the first sealing valve core and the second sealing valve core are close to each other in Embodiment 6 of the present invention.

[0047] Attached Fig.12 It is a schematic diagram of the three-dimensional structure of the first sealing valve core in the sixth embodiment of the present invention.

[0048] Attached Fig.13 It is a schematic diagram of the top cross-sectional structure of the first sealing valve core in the sixth embodiment of the present invention.

[0049] Attached Fig.14 It is a schematic diagram of the three-dimensional structure of the second sealing valve core in the sixth embodiment of the present invention.

[0050] Attached Fig.15 It is a schematic diagram of the top cross-sectional structure of the second sealing valve core in the sixth embodiment of the present invention.

[0051] Attached Fig.16 The three-dimensional structure of the eighth embodiment of the present invention when the second drive motor and the reducer are removed is shown in FIG. Figure 1 .

[0052] Attached Fig.17 The three-dimensional structure of the eighth embodiment of the present invention when the reducer and the reduction box are removed is shown in FIG. Figure 1 .

[0053] Attached Fig.18 The three-dimensional structure of the eighth embodiment of the present invention when the reducer and the reduction box are removed is shown in FIG. Figure 2 .

[0054] Attached Fig.19 The present invention is attached Figure 6 Schematic diagram of the three-dimensional enlarged structure of the self-tightening driven gear.

[0055] Attached Fig. 20 It is a schematic diagram of the three-dimensional structure of the left valve stem in the ninth embodiment of the present invention.

[0056] Attached Fig.21 It is a schematic diagram of an enlarged right-side sectional view of the connecting plate in the ninth embodiment of the present invention.

[0057] Attached Fig. 22 This is a schematic diagram of the circuit structure of the eleventh embodiment of the present invention.

[0058] Attached Fig.23 This is a schematic diagram of the main structure of the twelfth embodiment of the present invention when in use.

[0059] Attached Fig.24 It is a schematic diagram of the front cross-sectional structure of the twelfth embodiment of the present invention when in use.

[0060] Attached Fig.25 This is a schematic diagram of the left-side structure of the twelfth embodiment of the present invention when in use.

[0061] Attached Fig.26 The three-dimensional structure of the twelfth embodiment of the present invention is shown in FIG. Figure 1 .

[0062] Attached Fig. 27 The three-dimensional structure of the twelfth embodiment of the present invention is shown in FIG. Figure 2 .

[0063] Attached Fig.28 Schematic diagram of the three-dimensional structure of the twelfth embodiment of the present invention after the sealing shell is removed Figure 1 .

[0064] Attached Fig.29 Schematic diagram of the three-dimensional structure of the twelfth embodiment of the present invention after the sealing shell is removed Figure 2 .

[0065] Attached Fig.30 This is a schematic diagram of the circuit structure of the twelfth embodiment of the present invention.

[0066] Attached Fig.31 It is a schematic diagram of the three-dimensional structure of the left valve stem in the thirteenth embodiment of the present invention.

[0067] Attached Fig.32 It is a schematic diagram of the three-dimensional structure of the right valve stem in the thirteenth embodiment of the present invention.

[0068] Attached Fig.33 For attachment Fig.24 A schematic diagram of the enlarged right-side sectional view of the first top plate in FIG.

[0069] Attached Fig.34 For attachment Fig.24 A schematic diagram of the enlarged structure of the left view section of the first top plate.

[0070] The codes in the attached drawings are: 1 is a leakage sensor, 2 is a storage box, 3 is a sucker rod hole, 4 is an explosion-proof box, 5 is a liquid level sensor, 6 is a photoelectric panel, 7 is a monitoring frame, 8 is a camera, 9 is a packing gland, 10 is a sucker rod, 11 is a valve body, 12 is a first sealing valve core, 13 is a second sealing valve core, 14 is a sucker rod mounting hole, 15 is a first sealing groove, 16 is a second sealing groove, 17 is a sucker rod sealing hole, 18 is a sealing packing, 19 is a compression sleeve, 20 is a support plate, 21 is a first drive motor, 22 is an adjusting top Thread, 23 is a self-tightening driving gear, 24 is a left mounting step, 25 is a right mounting step, 26 is a transition step, 27 is a block, 28 is a retaining spring, 29 is a self-tightening driven gear, 30 is a guide groove, 31 is a guide portion, 32 is a first sealing end cover, 33 is a second sealing end cover, 34 is a first sealing sleeve, 35 is a second sealing sleeve, 36 is a first sealing packing, 37 is a second sealing packing, 38 is a first compression sleeve, 39 is a second compression sleeve, 40 is a first sealing gland, 41 is a second sealing gland, 42 is a fixed seat, 43 is reducer, 44 is the second driving motor, 45 is the first driving gear, 46 is the second driving gear, 47 is the reduction box, 48 is the driving bevel gear, 49 is the first driven bevel gear, 50 is the second driven bevel gear, 51 is the first output shaft, 52 is the second output shaft, 53 is the first driven gear, 54 is the second driven gear, 55 is the connecting plate, 56 is the pull rod, 57 is the disassembly section, 58 is the rotating section, 59 is the left limit ring platform, 60 is the right limit ring platform, 61 is the limit platform, 62 is the left connecting frame, 63 is the first travel switch, 64 is the second travel switch, 65 is the left drive motor, 66 is the right drive motor, 67 is the first mounting bracket, 68 is the second mounting bracket, 69 is the first push rod, 70 is the second push rod, 71 is the first top plate, 72 is the second top plate, 73 is the first push rod, 74 is the second push rod, 75 is the left taking-out section, 76 is the right taking-out section, 77 is the left limiting section, 78 is the right limiting section, 79 is the first limiting plate, 80 is the second limiting plate, 81 is the third limiting plate, 82 is the fourth limiting plate, 83 is the left limiting boss, and 84 is the right limiting boss. DETAILED DESCRIPTION

[0071] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0072] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0073] The present invention will be further described below in conjunction with embodiments and drawings:

[0074] Embodiment 1: As shown in the attached Figure 1 , 2 As shown in Figures 3 and 4, the wellhead leakage alarm device includes a leakage sensor 1, a reversible battery, a control unit and a storage box 2. A sucker rod hole 3 for installing a sucker rod 10 is provided at the upper end of the storage box 2. The leakage sensor 1 is fixedly installed on the inner side of the lower part of the storage box 2. A collecting hole communicating with the inside and outside is provided on the inner side of the lower part of the storage box 2 corresponding to the position above the leakage sensor 1. An explosion-proof box 4 is installed on the outer side of the upper part of the storage box 2 corresponding to the position of the collecting hole. A plurality of photoelectric panels 6 are fixedly installed on the outer side of the explosion-proof box 4. A solar controller, a reversible battery and a liquid level sensor 5 with the end passing through the inner side of the explosion-proof box 4 and the collecting hole are arranged in intervals in the explosion-proof box 4. The plurality of photoelectric panels 6 are all connected to the solar controller, the solar controller is respectively connected to the reversible battery and the control unit, and the control unit is respectively connected to the leakage sensor 1 and the liquid level sensor 5.

[0075] When in use, the storage box 2 is sleeved on the outside of the sucker rod 10 and fixedly installed on the upper side of the wellhead packing gland 9. In order to facilitate the disassembly and assembly between the storage box 2 and the packing gland 9, a threaded tube is fixed on the upper end of the packing gland 9 (or a ring platform with threads on the outside is processed), and the inner side of the lower end of the storage box 2 is screwed to the outer side of the threaded tube. In order to reduce the weight of the storage box 2, the storage box 2 can be designed as a bottomless box, so that the upper surface of the packing gland 9 can be used as the bottom wall of the storage box 2. A strong magnet is fixed on the inside of the explosion-proof box 4, so that the explosion-proof box 4 can be adsorbed on the outer side of the upper part of the storage box 2. The explosion-proof grade of the explosion-proof box 4 is ExiaⅡBT4, and the sealing protection grade is IP65. It can prevent the intrusion of gas, liquid, and dust. The operating temperature is -40 to 60°C, and it has good corrosion resistance and mechanical strength.

[0076] Photovoltaic panels 6 are installed on both sides of the explosion-proof box 4. The photovoltaic panels 6 are existing well-known technologies. The material of the photovoltaic panels 6 is crystalline silicon. The solar radiation energy can be directly converted into electrical energy through the photoelectric effect, and the excess electrical energy can be stored in the reversible battery through the solar controller. In winter or when the light is insufficient, the reversible battery can realize power supply. When the power of the reversible battery is insufficient, a low-power alarm is issued. The power demand can be met by manual charging. Several photovoltaic panels 6, solar controllers and reversible batteries constitute an existing well-known solar power generation system or solar charging system.

[0077] The sensing surface of the leakage sensor 1 contacts the upper end surface of the packing gland 9. When the produced fluid splashes onto the sensing surface of the leakage sensor 1, in order to avoid the produced fluid staying on the sensing surface for too long, the sensing surface of the leakage sensor 1 can be tilted. The sensing surface of the leakage sensor 1 can also be set downward, so that the leaked produced fluid can flow along the sensing surface, avoiding the leakage sensor 1 from continuously receiving the leaked produced fluid, and avoiding interference. The leakage sensor 1 sends a signal to the control unit, and the storage box 2 can prevent rainwater from falling into the leakage sensor 1 in rainy weather, resulting in false information alarms.

[0078] When the packing punctures and leaks on site, the produced fluid splashes onto the sensing surface of the leakage sensor 1 through the gap between the sucker rod 10 and the packing gland 9. The leakage sensor 1 sends a signal to the control unit, and the control unit sends a prompt message of the leakage. The operator inspects the wellhead according to the prompt message, and can issue an early warning after the wellhead puncture and leak occurs. This avoids a large amount of leakage during leakage, which brings great safety risks and hidden dangers of environmental pollution. The puncture and leak phenomenon can be handled in time, and the difficulty of handling the puncture and leak in the early stage of leakage is also relatively low. It is only necessary to tighten the packing gland 9. At this time, the amount of produced fluid leakage is small, which can reduce further pollution to the wellhead environment. The device is suitable for wellhead leakage under various working conditions, and can meet the needs of oil fields to promote the construction of intelligent oil fields. It can timely warn the risk of oil well wellhead leakage, reduce the occurrence of wellhead pollution incidents, realize unmanned operation, and provide technical support for the development of green oil fields. It has a good prospect for promotion and application. According to actual needs, the above-mentioned wellhead leakage alarm device can be further optimized or / and improved:

[0079] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figures 1 to 4 As shown, the liquid level sensor 5 can detect the liquid level and the mineralization degree of the produced liquid at the same time, and also includes a monitoring frame 7 and a camera 8 fixedly installed on the upper outer side of the monitoring frame 7. A receiving module is fixedly installed on the lower side of the camera 8. A transmitting module and a processing module are fixedly installed at intervals in the explosion-proof box 4. The transmitting module is connected to the receiving module, and the processing module is respectively connected to the camera 8 and the receiving module. The transmitting module and the processing module are both connected to the control unit.

[0080] According to requirements, the storage box 2 can be a split structure, the lower part of the storage box 2 is fixedly installed together with the upper end of the packing cover 9, the lower and upper parts of the storage box 2 are screwed together, the transmitting module is an infrared transmitter, the receiving module is an infrared receiver, and the outer side of the explosion-proof box 4 is provided with a signal hole for the transmitting module to transmit signals to the receiving module. The leakage sensor 1 is a rain sensor or a capacitive sensing rain sensor. The sensing surface of the leakage sensor 1 can be U-shaped and tilted outward from top to bottom. The end of the liquid level sensor 5 is located at the opening of the leakage sensor 1. The liquid level sensor 5 is an integrated liquid level-conductivity detection probe. The camera 8, the sending module, the receiving module and the processing module can form an existing well-known BovaTech drip identification camera or a liquid leakage identification camera, and the control unit is an existing well-known industrial computer.

[0081] When the packing is punctured and leaked on site, the produced fluid splashes onto the sensing surface of the leakage sensor 1 through the gap between the sucker rod 10 and the upper end of the packing gland 9, and the leakage sensor 1 sends a signal to the control unit, and the control unit starts the transmitting module to transmit the signal. When the receiving module receives the signal from the transmitting module, the processing module simultaneously determines whether the wellhead packing gland 9 is leaking based on the picture information of the outer side of the upper part of the storage box 2 taken by the camera 8. The produced fluid will spray out from between the storage box 2 and the sucker rod 10 and leak to the upper end surface of the storage box 2. If the processing module also determines that the wellhead packing is leaking based on the photo information, the processing module sends the photo information of the leakage collected by the camera 8 to the control unit, and the control unit issues a prompt message of the leakage. The operating personnel inspect the wellhead based on the prompt message. The device is suitable for wellhead leakage under various working conditions, can meet the needs of oil fields to promote the construction of intelligent oil fields, can timely warn of the risk of wellhead leakage in oil wells, improve the efficiency and timeliness of on-site emergency disposal of wellhead leakage during oil production, and reduce the occurrence of wellhead pollution incidents.

[0082] The present invention is applicable to various packing boxes at oil wellheads. There is no need to modify the packing boxes. It only needs to adsorb the explosion-proof box 4 with a strong magnet on the outside of the wellhead packing gland 9 or the outside of the storage box 2, and the infrared transmitter faces the infrared receiver next to the camera 8, and then it can be installed and used. The power source of the wellhead leakage alarm device adopts a photoelectric panel 6 plus a reversible battery to achieve independent power supply, which is green and energy-saving and easy to install. The leakage sensor 1 of the wellhead leakage alarm device complements the image information obtained by the processing module to improve the accuracy of the early warning.

[0083] Embodiment 3: As shown in the attached Figures 1 to 5 As shown, the wellhead early warning method includes the following steps:

[0084] S1, the storage box 2 is fixedly mounted on the upper end of the packing gland 9, so that the sucker rod 10 passes through the sucker rod hole 3, and a sealing ring is installed inside the sucker rod hole 3;

[0085] S2, the explosion-proof box 4 and the storage box 2 are fixedly installed together, and the monitoring frame 7 is fixedly installed on one side of the wellhead;

[0086] S3, start the wellhead leakage alarm device, and the leakage sensor 1 and the liquid level sensor 5 collect the liquid data in the storage box 2;

[0087] When the produced fluid splashes onto the surface of the leakage sensor 1 in the storage box 2, the leakage sensor 1 sends a leakage instruction to the control unit, the control unit sends a start instruction to the transmitting module, the transmitting module sends a signal to the receiving module, the receiving module sends a signal to the processing module, the processing module collects the image information of the upper outer side of the storage box 2 through the camera 8, and determines whether the packing gland 9 has leakage according to the image information. If leakage occurs, the processing module will send a first-level warning signal to the control unit;

[0088] When the produced fluid leaks and flows into the storage box 2, and the liquid level sensor 5 determines that the liquid level of the produced fluid flowing into the storage box 2 is greater than or equal to the set value, and the salinity value of the produced fluid is less than the set value, a secondary warning signal is sent to the control unit;

[0089] When the produced fluid leaks and flows into the storage box 2, and the liquid level sensor 5 determines that the liquid level and the salinity value of the produced fluid flowing into the storage box 2 are both greater than or equal to the set value, the liquid level sensor 5 sends a third-level warning signal to the control unit;

[0090] S4, the control unit releases alarm information based on the warning signal reception time and warning signal level, including:

[0091] When the control unit receives the first-level warning signal at time t1, the control unit issues a wellhead leakage warning and inspection prompt information;

[0092] When the control unit receives the second-level warning signal at time t2, it determines the time when the control unit receives the third-level warning signal, marks it as time t3, and determines whether time t3 is less than or equal to t2+K, where K is the time setting value. If so, the control unit issues a wellhead leakage alarm message, and determines the wellhead leakage speed information based on the time difference between time t3 and time t2, and issues an alarm message;

[0093] If not, the control unit sends a prompt message to clean the water in the wellhead storage box 2;

[0094] Among them, time t1 is earlier than time t2, and time t2 is earlier than time t3.

[0095] A sealing ring is installed inside the sucker rod hole 3. When leakage occurs, the produced fluid will still spray out from between the sealing ring and the sucker rod 10 and then leak to the upper end surface of the storage box 2.

[0096] When the produced fluid splashes onto the surface of the leakage sensor 1 in the storage box 2, the leakage sensor 1 sends a leakage instruction to the control unit, the control unit sends a start instruction to the transmitting module, the transmitting module sends a signal to the receiving module, and when the receiving module receives the signal, the camera 8 starts, and the processing module obtains the image information of the upper outer side of the storage box 2 collected by the camera 8, and judges whether the packing gland 9 has leakage according to the image information. If no leakage occurs, the camera 8 stops collecting pictures and returns to the initial state. If leakage occurs, the processing module will send a first-level warning signal to the control unit, and the processing module stores the image information of the upper outer side of the storage box 2 where the leakage occurs, and then the camera 8 ends the image collection work. When the produced fluid splashes onto the surface of the leakage sensor 1 in the storage box 2, the above steps are repeated to judge whether the packing gland 9 has leakage according to the image information. Existing known technology is used, such as the leakage detection method, device, equipment and medium based on deep learning disclosed in the Chinese patent document with publication number CN117710374A;

[0097] If at time t3, the difference between time t3 and time t2 is less than or equal to the set value, and the control unit does not receive the third-level warning signal, the control unit does not issue a wellhead leakage warning message, and the control unit issues a reminder message for cleaning the accumulated water in the wellhead storage box 2.

[0098] In step S3, when the produced fluid leaks and flows into the storage box 2, and the liquid level is greater than or equal to 20 mm, the liquid level sensor 5 sends a secondary warning signal to the control unit; when the produced fluid leaks and flows into the storage box 2, and the liquid level is greater than or equal to 20 mm and the mineralization value of the produced fluid is greater than or equal to 1500 mg / L, the liquid level sensor 5 sends a third-level warning signal to the control unit, and the time setting value K in step S4 is 15 min.

[0099] A storage box 2 is installed on the upper side of the packing gland 9. The material of the storage box 2 is the same as that of the packing gland 9. The storage box 2 and the upper end of the packing gland 9 are screwed together. The storage box 2 can be flexibly disassembled for easy inspection and maintenance. If a leak occurs at the wellhead, the produced fluid enters the storage box 2. The leakage sensor 1 sends a signal after detecting it. An inner ring groove for installing a sealing ring is provided on the inner side of the upper end of the storage box 2. The sealing ring can prevent rain, snow, dust, sand, etc. from entering the storage box 2 and affecting the normal use of the leakage sensor 1. The outer diameter of the storage box 2 can be the same as that of the packing gland 9, and the height inside the storage box 2 is 30 mm.

[0100] The leakage sensor 1 is a capacitive induction rain sensor, which is installed on the inner wall of the storage box 2. When the produced liquid splashes onto the surface of the leakage sensor 1 in the storage box 2, the leakage sensor 1 sends a leakage command to the control unit, the control unit sends a start command to the transmitting module, the transmitting module sends a signal to the receiving module, and when the receiving module receives the signal, the processing module obtains the image information of the upper outer side of the storage box 2 captured by the camera 8, and determines whether the packing gland 9 is leaking based on the image information. If no leakage occurs, the camera 8 stops collecting images. If leakage occurs, the processing module will send a first-level warning signal to the control unit.

[0101] The photovoltaic panel 6 is installed on the upper outer side of the packing gland 9. The photovoltaic panel 6 can directly convert solar radiation energy into electrical energy through the photoelectric effect, and store the excess electrical energy in the built-in reversible battery. In winter or when there is insufficient light, the reversible battery can realize power supply. When the power storage is insufficient, a low-power alarm is issued, and manual charging is required to meet the power supply.

[0102] The explosion-proof box 4 and the photoelectric panel 6 can be integrated into one, and the photoelectric panel 6 can also be fixedly installed on the outer side of the upper part of the packing gland 9 in the following ways: a strong magnet is fixedly installed on the back of the photoelectric panel 6, and the photoelectric panel 6 is adsorbed on the outer side of the packing gland 9 by the strong magnet, which is convenient for disassembly and assembly, and can be flexibly inspected and maintained; a non-metallic fastening belt is arranged on the outer side of the photoelectric panel 6, and the photoelectric panel 6 is fixedly installed together with the outer side of the packing gland 9 through the fastening belt. The photoelectric panel 6 can also be fixedly installed together with the packing gland 9 through a stainless steel cable tie to ensure that the photoelectric panel 6 is safely fixed to prevent the photoelectric panel 6 from falling in windy weather.

[0103] The liquid level sensor 5 is an integrated liquid level-conductivity detection probe. The integrated liquid level-conductivity detection probe is inserted into the collection hole and fixed with screws. The integrated liquid level-conductivity detection probe can simultaneously measure the liquid level and the mineralization of the liquid in the storage box 2. When a leak occurs at the wellhead, the produced fluid enters the storage box 2 through the gap between the sucker rod 10 and the upper end of the packing gland 9, that is, the produced fluid flows into the storage box 2 after the leak occurs. When the amount of the leaked collected fluid is greater than or equal to 20 mm, the liquid level sensor 5 sends a secondary warning signal to the control unit; when the amount of the leaked collected fluid is greater than or equal to 20 mm and the liquid mineralization value is greater than or equal to 1500 mg / L, the liquid level sensor 5 sends a third-level warning signal to the control unit, which can effectively prevent false alarms in rainy and snowy weather conditions, thereby improving the accuracy of wellhead leakage identification and the timeliness of emergency disposal during oil production.

[0104] An existing well-known wireless receiver and wireless transmitter are provided on the outside of the explosion-proof box 4, and both the wireless receiver and the wireless transmitter are connected to the control unit, so that the control unit can connect multiple devices to form a bus network to achieve long-distance, high-reliability data transmission. According to the needs of specific application scenarios, by replacing the communication module, the control unit supports NB-IoT, LoRa, Zigbee, Wi-Fi, 4G, 5G and other wireless communication methods to adapt to different network environments and application scenarios.

[0105] According to the water content of the produced fluid, the alarm liquid level value is set to 20mm, the tested mineralization of the produced fluid water phase is 5600mg / L, the local rainwater mineralization is 400mg / L, the leakage alarm mineralization value is set to 1500mg / L, and an integrated liquid level-conductivity detection probe with an automatic conductivity detection time of less than 10 minutes is selected. The difference between time t3 and time t2 is less than or equal to the set value, and the set value is 15 minutes.

[0106] When the control unit receives a first-level warning signal at time t1, it issues a wellhead leakage warning and inspection reminder message; when the control unit receives a second-level warning signal at time t2, if at time t3, the difference between time t3 and time t2 is less than or equal to 15 minutes, and the control unit receives a third-level warning signal, it issues a wellhead leakage alarm message, and displays the wellhead leakage speed information based on the time difference of the received signal; if at time t3, the difference between time t3 and time t2 is less than or equal to 15 minutes, and the control unit does not receive the third-level warning signal, the control unit does not issue a wellhead leakage warning message, and the control unit issues a reminder message for cleaning the accumulated water in the wellhead storage box 2.

[0107] Embodiment 4: As shown in the attached Figures 6 to 10As shown, the wellhead intelligent leakage prevention system includes a wellhead leakage alarm device, a packing gland 9, a first sealing valve core 12, a second sealing valve core 13, a first driving assembly, a second driving assembly and a cross-shaped valve body 11. A sucker rod mounting hole 14 is provided in the center of the upper end of the valve body 11, which passes through from top to bottom. A sealing packing 18 is provided on the inner side of the upper part of the valve body 11. A compression sleeve 19 is installed on the upper end of the sealing packing 18. A packing gland 9 is screwed on the outer side of the upper end of the valve body 11. A first driving assembly is provided on the outer side of the upper part of the valve body 11, which can make the packing gland 9 rotate and compress the sealing packing 18 through the compression sleeve 19. The lower end of the storage box 2 of the wellhead leakage alarm device is fixedly installed on the upper end of the packing gland 9. The sucker rod hole 3 is connected to the sucker rod mounting hole 14. The left end of the lower part of the valve body 11 is connected to the sucker rod through the right end. A first sealing hole connected to the rod mounting hole 14, a second sealing hole is provided at the right end of the valve body 11 corresponding to the position of the first sealing hole, and the left end is connected to the sucker rod hole 3, a first sealing valve core 12 is installed in the first sealing hole, and a first sealing groove 15 is provided at the right end of the first sealing valve core 12, which passes through the first sealing hole, and a second sealing valve core 13 is installed in the second sealing hole, and a second sealing groove 16 is provided at the left end of the second sealing valve core 13, and a sucker rod sealing hole 17 matching the sucker rod 10 can be formed when the first sealing valve core 12 and the second sealing valve core 13 contact each other, and a second driving assembly is provided on the outer side of the lower part of the valve body 11, which can make the first sealing valve core 12 and the second sealing valve core 13 approach or move away from each other, and the first driving assembly and the second driving assembly are both connected to the control unit.

[0108] According to the requirements, the inner side of the upper part of the sucker rod mounting hole 14 has a conical surface which is larger at the top and smaller at the bottom, and there is a step at the lower end of the conical surface. A copper sleeve is installed on the step, and the sealing packing 18 is installed in the conical surface at the upper end of the copper sleeve. In this way, when the compression sleeve 19 compresses the upper part of the sealing packing 18, the sealing packing 18 can be in sealing contact with the outer side of the sucker rod 10. The inner side of the lower end of the valve body 11 can be provided with a thread for connecting to the wellhead equipment, or a flange for connecting to the wellhead equipment is fixed to the outer side of the lower end of the valve body 11.

[0109] During use, the lower end of the valve body 11 is quickly installed together with the wellhead equipment. When the sealing packing 18 on site is punctured and leaks, the control unit receives the first-level warning signal and sends out a wellhead leakage warning and inspection prompt information. When the pumping unit continues to pump, the control unit operates the first drive assembly, and the first drive assembly compresses the sealing packing 18 through the compression sleeve 19, so that the sealing packing 18 is in sealing contact with the outer side of the sucker rod 10, thereby preventing and stopping the sealing packing 18 from continuing to leak, and can replace the packing tightening operation of the on-site operators.

[0110] When the sucker rod 10 leaks or blows out due to steam channeling, the control unit receives a second-level warning signal within 15 minutes after receiving the first-level warning signal, and then issues a wellhead leakage alarm message. At the same time, the control unit uses the second drive component to make the first sealing valve core 12 and the second sealing valve core 13 close to each other and quickly and promptly seal and contact the outside of the sucker rod 10, thereby ensuring the safe operation of the wellhead blowout preventer of the pumping unit and reducing the occurrence of wellhead pollution incidents. If the control unit does not receive a second-level warning signal within 15 minutes after receiving the first-level warning signal, the wellhead leakage warning message is canceled, and a reminder message for cleaning the accumulated water in the wellhead storage box 2 is issued, realizing unmanned operation and providing technical support for the development of green oil fields, with good prospects for promotion and application.

[0111] The above-mentioned wellhead intelligent leakage prevention system can be further optimized and / or improved according to actual needs:

[0112] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figures 6 to 10 As shown in Figures 1 and 2, the first drive assembly includes a support plate 20, a first drive motor 21, an adjusting screw 22 and a self-tightening driving gear 23. A symmetrically distributed left mounting step 24 and a right mounting step 25 are provided on the left and right outer sides of the valve body 11 corresponding to the position below the packing gland 9. A mounting hole is provided on the upper front side of the support plate 20, and the left inner wall and the right inner wall of the mounting hole are both vertical surfaces. The distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left mounting step 24 and the right mounting step 25. The support plate 20 is seated on the left mounting step 24 and the right mounting step 25. On the installation step 25, an adjusting screw hole that passes through the front and back is provided on the front side of the support plate 20, and a limiting screw hole is provided on the front side of the valve body 11 corresponding to the position of the adjusting screw hole. An adjusting top screw 22 that is screwed on the rear outer side and is screwed in the limiting screw hole is threaded in the adjusting screw hole. A first drive motor 21 is fixedly installed on the lower rear side of the support plate 20, and a self-tightening driving gear 23 is fixedly installed on the output shaft of the first drive motor 21 after passing through the upper side of the support plate 20. A self-tightening driven gear 29 that meshes with the upper outer side of the self-tightening driving gear 23 is detachably fixedly installed on the outer side of the lower part of the packing gland 9, and the first drive motor 21 is connected to the control unit.

[0113] According to the needs, a vent hole connected inside and outside is provided on the upper rear side of the valve body 11 corresponding to the position below the first drive motor 21. A hollow vent nozzle is fixedly installed in the vent hole, and a vent plug is screwed on the inner side of the rear of the vent nozzle. The first drive motor 21 is an existing well-known technology, such as a micro DC motor with model number 90DC. In order to protect the self-tightening driving gear 23 and the self-tightening driven gear 29, two shells arranged in half are installed on the upper side of the support plate 20. One side of the two shells is hingedly installed, and the other side of the two shells can be provided with an existing well-known lock.

[0114] The outer side of the upper part of the packing gland 9 is four-sided, and a transition step 26 is formed between the four-sided and the cylindrical surface on the outer side of the lower part of the packing gland 9. A clamping block 27 seated on the transition step 26 is fixed to the inner side of the self-tightening driven gear 29, and a clamping groove is provided on the four sides corresponding to the position above the self-tightening driven gear 29. A retaining spring 28 in contact with the upper end of the self-tightening driven gear 29 is installed in the clamping groove. This makes it more convenient to disassemble and assemble the self-tightening driven gear 29. When the sealing packing 18 needs to be replaced, it is only necessary to disassemble the packing gland 9 and the self-tightening driven gear 29, thereby reducing the difficulty of replacing the sealing packing 18.

[0115] When the sealing packing 18 is worn to the point where it cannot meet the wellhead sealing requirements, the sealing packing 18 is replaced. First, the explosion-proof box 4 is removed, and then the retaining spring 28 is removed. The self-tightening driven gear 29 is pulled upward from the outside of the packing gland 9 to disengage it from the self-tightening driving gear 23. The self-tightening driven gear 29 is then hung on a rope hanger or a sucker rod 10. After the packing gland 9 is disassembled, the compression sleeve 19 is removed to replace the sealing packing 18. After the operation is completed, the packing gland 9 is tightened, the self-tightening driven gear 29 is downwardly inserted into the packing gland 9 and then seated on the transition step 26. The retaining spring 28 is used for positioning to restore the cooperation between the self-tightening driving gear 23 and the self-tightening driven gear 29.

[0116] When replacing the sealing packing 18, loosen the adjusting top screw 22, move the support plate 20 to the rear side of the self-tightening driving gear 23, so that the self-tightening driving gear 23 and the self-tightening driven gear 29 are disengaged for a distance, disassemble the packing gland 9 and remove the compression sleeve 19 to replace the sealing packing 18. After the operation is completed, tighten the packing gland 9 and tighten the adjusting top screw 22. Adjust the top screw 22 to move the support plate 20 to the initial position (front side), and finally make the self-tightening driving gear 23 and the self-tightening driven gear 29 mesh with each other.

[0117] The support plate 20 can also be moved backward relative to the left mounting step 24 and the right mounting step 25 by rotating the adjusting top screw 22, so that the self-tightening driving gear 23 and the self-tightening driven gear 29 are out of meshing state, and then the self-tightening driven gear 29 and the packing gland 9 are removed from the outside of the valve body 11, and the compression sleeve 19 is removed to replace the sealing packing 18. After the operation is completed, the packing gland 9 is tightened, the self-tightening driven gear 29 and the packing gland 9 are fixedly installed together, and then the packing gland 9 and the valve body 11 are screwed together. When the self-tightening driven gear 29 moves to correspond to the self-tightening driving gear 23, the support plate 20 is moved forward relative to the left mounting step 24 and the right mounting step 25 by rotating the adjusting top screw 22, and finally the meshing relationship between the self-tightening driving gear 23 and the self-tightening driven gear 29 is restored.

[0118] When assembling the self-tightening driving gear 23 and the self-tightening driven gear 29, tighten the adjusting screw 22 to move the support plate 20 backward relative to the left mounting step 24 and the right mounting step 25, so that a certain distance is maintained between the rear side of the self-tightening driving gear 23 and the valve body 11 to facilitate the installation of the packing gland 9 and the self-tightening driven gear 29, and then install the self-tightening driven gear 29 and the packing gland 9 and screw them to the outside of the valve body 11, rotate the packing gland 9 to make the packing gland 9 and the self-tightening driven gear 29 move downward until the self-tightening driven gear 23 is The lower end surface of the wheel 29 is located below the upper end surface of the self-tightening driving gear 23, and then the adjusting top screw 22 is loosened to make the support plate 20 move forward relative to the left mounting step 24 and the right mounting step 25 until the self-tightening driving gear 23 and the self-tightening driven gear 29 are fully engaged. At this time, the head of the adjusting top screw 22 is pressed against the front side of the support plate 20, and the stud end of the adjusting top screw 22 is screwed into the locking screw hole, the rear side of the valve body 11 and the rear inner wall of the mounting hole are in contact, and the distance between the front inner wall of the mounting hole and the front side of the valve body 11 is the largest.

[0119] In order to increase the stability between the support plate 20 and the valve body 11, symmetrical front mounting steps and rear mounting steps are provided on the upper front side and upper rear side of the valve body 11 corresponding to the position between the left mounting step 24 and the right mounting step 25, that is, the outer contour surface of the upper outer side of the valve body 11 is square, the mounting hole is rectangular, the width of the mounting hole is the same as the distance between the vertical surfaces of the left mounting step 24 and the right mounting step 25, the length of the mounting hole is greater than the distance between the vertical surfaces of the front mounting step and the rear mounting step, and the limiting screw hole is provided on the vertical surface of the front mounting step.

[0120] The distance between the front mounting step vertical surface and the rear mounting step vertical surface is smaller than the length of the mounting hole, and the difference between the distance between the front side surface and the rear side surface of the mounting hole and the distance between the front mounting step vertical surface and the rear mounting step vertical surface is 10 to 20 mm.

[0121] The tooth width of the self-tightening driven gear 29 is 10 to 20 mm, and the sum of the stroke height and the tooth width of the self-tightening driven gear 29 is less than the tooth width of the self-tightening driving gear 23. The tooth width of the self-tightening driving gear 23 can be 60 mm, and the tooth width of the self-tightening driven gear 29 can be 15 mm. The stroke height of the sealing packing 18 operation is 28 mm, that is, the stroke height of the self-tightening driven gear 29 is 28 mm.

[0122] The first drive motor 21 is installed on the valve body 11 through the support plate 20. The output shaft of the first drive motor 21 is parallel to the sucker rod 10 and maintains a certain distance from the sucker rod 10, so that the self-tightening driving gear 23 installed on the output shaft of the first drive motor 21 and the self-tightening driven gear 29 installed on the packing gland 9 are parallel shafts and transmit in the same direction to realize the control of the operation of the sealing packing 18. The self-tightening driven gear 29 is installed at the bottom of the packing gland 9. When the sealing packing 18 is full, the self-tightening driven gear 29 is meshed with the upper part of the self-tightening driving gear 23. When the sealing packing 18 is empty, the self-tightening driven gear 29 is meshed with the lower part of the self-tightening driving gear 23.

[0123] In order to facilitate automatic control of the first drive motor 21, the first drive motor 21 is connected to the control unit. When the sealing packing 18 on site is punctured and leaked, the control unit receives the first-level warning signal and sends out a wellhead leakage warning and inspection prompt information. When the pumping unit does not stop pumping, the control unit makes the first drive motor 21 work. The first drive motor 21 compresses the sealing packing 18 through the compression sleeve 19, so that the sealing packing 18 and the outer side of the sucker rod 10 are in sealing contact, thereby preventing and stopping the sealing packing 18 from continuing to puncture and leak. It can replace the packing tightening operation of the on-site operators. In this way, the wellhead packing can be automatically tightened when the pumping unit does not stop pumping. It can replace the packing tightening operation of the on-site operators. The wellhead packing can be tightened by remote control to prevent and stop the packing from continuing to puncture and leak. It is suitable for wellhead sealing under various working conditions and improves the safety and efficiency of wellhead sealing during oil production.

[0124] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 8 , 11 As shown in Figure 15, the left end of the second sealing valve core 13 is provided with an arc-shaped guide groove 30 that passes through from top to bottom and opens to the left. The right part of the guide groove 30 is interconnected with the left part of the second sealing groove 16. The right end of the first sealing valve core 12 corresponding to the front and rear positions of the first sealing groove 15 is fixedly installed with a guide part 31. The first sealing groove 15, the guide part 31 and the second sealing groove 16 can form a sucker rod sealing hole 17.

[0125] During use, the lower end of the valve body 11 is quickly installed with the wellhead equipment, and the guide groove 30 is in an arc shape with an opening to the left. The right part of the guide groove 30 is connected with the left part of the second sealing groove 16. In this way, when the sucker rod 10 in the sucker rod mounting hole 14 is not in the center, the second sealing valve core 13 moves to the left, so that the eccentric sucker rod 10 can move along the inner wall of the guide groove 30 into the second sealing groove 16, which can have a straightening effect on the eccentric sucker rod 10, and then the guide part 31 moves to the right again to seal and contact with the guide groove 30. Finally, the first sealing groove 15, the guide part 31 and the second sealing groove 16 are close to each other to form a cylindrical sucker rod sealing hole 17 that runs through from top to bottom. The outer side of the sucker rod 10 is in sealing contact with the inner wall of the sealing hole, thereby closing the sucker rod mounting hole 14. When the sealing packing 18 on site is punctured and leaks, the second drive assembly works and compresses the sealing packing 18 through the compression sleeve 19 while the pumping unit is pumping continuously, so that the sealing packing 18 is in sealing contact with the outer side of the sucker rod 10, thereby preventing and stopping the sealing packing 18 from continuing to puncture and leak. It can replace the packing tightening operation of the on-site operators. When the sucker rod 10 leaks or a steam blowout occurs, the sucker rod mounting hole 14 can be closed promptly and quickly by the first drive assembly and the second drive assembly, thereby ensuring the safe operation of the wellhead blowout preventer of the pumping unit and reducing the occurrence of wellhead pollution incidents.

[0126] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figures 6 to 10 As shown in 16 to 18, a first sealing end cover 32 is fixedly installed at the left end of the lower part of the valve body 11, and a left threaded hole is provided in the center of the first sealing end cover 32, and a left valve stem whose right end is fixedly installed with the first sealing valve core 12 is threadedly connected in the left threaded hole, and the left end of the left valve stem is installed together with the corresponding position of the second driving assembly, and a first sealing sleeve 34 sleeved on the outer side of the left part of the left valve stem is fixedly installed on the left end of the first sealing end cover 32, and a first sealing packing 36 is sleeved in the first sealing sleeve 34, and a first compression sleeve 38 is installed on the left end of the first sealing packing 36, and a first sealing gland 40 is threadedly connected to the outer side of the first sealing sleeve 34, and the inner side of the left part of the first sealing gland 40 abuts against the left end of the first compression sleeve 38;

[0127] A second sealing end cover 33 is fixedly installed on the right end of the lower part of the valve body 11. A right threaded hole is provided in the center of the second sealing end cover 33, and a right valve stem whose left end is fixedly installed with the second sealing valve core 13 is threadedly connected in the right threaded hole. The right end of the right valve stem is installed with the corresponding position of the second driving assembly. A second sealing sleeve 35 which is sleeved on the outer side of the right part of the right valve stem is fixedly installed on the right end of the second sealing end cover 33. A second sealing packing 37 is sleeved in the second sealing sleeve 35. A second compression sleeve 39 is installed on the right end of the second sealing packing 37. A second sealing gland 41 is threadedly connected to the outer side of the second sealing sleeve 35. The inner side of the right part of the second sealing gland 41 abuts against the right end of the second compression sleeve 39.

[0128] According to needs, an inner ring platform is provided on the inner side of the left part of the first sealing end cover 32 and the inner side of the right part of the second sealing end cover 33, and bearings or bearing shells are installed between the inner ring platform and the outer side of the left valve stem and the outer side of the right valve stem, so that the rotation of the left valve stem and the right valve stem is more flexible.

[0129] During use, when the second drive assembly drives the left valve stem and the right valve stem to rotate, under the action of the left threaded hole and the right threaded hole, the left valve stem and the right valve stem rotate and move closer to or away from each other. When leakage occurs between the first sealing end cover 32 and the left valve stem, the first sealing gland 40 can be tightened, so that the left inner side of the first sealing gland 40 presses the left end of the first compression sleeve 38, so that the first compression sleeve 38 presses the first sealing packing 36, so that the first sealing packing 36 is in close contact with the outer side of the left valve stem, thereby avoiding further leakage between the first sealing end cover 32 and the left valve stem. Similarly, when leakage occurs between the second sealing end cover 33 and the right valve stem, After leakage occurs, the second sealing cover 41 can be tightened, so that the right inner side of the second sealing cover 41 presses the right end of the second compression sleeve 39, so that the second compression sleeve 39 presses the second sealing packing 37, so that the second sealing packing 37 is in close contact with the outer side of the right valve stem, thereby avoiding further leakage between the second sealing end cover 33 and the right valve stem. In order to increase the contact area between the first sealing cover 40 and the first compression sleeve 38, and between the second sealing cover 41 and the second compression sleeve 39, the inner side of the left end of the first sealing cover 40 and the inner side of the right end of the second sealing cover 41 are both provided with an inner ring platform, and the left end of the first compression sleeve 38 and the right end of the second compression sleeve 39 are both provided with an outer ring platform.

[0130] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figures 6 to 10, 16 to 18, the second drive assembly includes a fixed seat 42, a reducer 43, a second drive motor 44, a first driving gear 45 and a second driving gear 46. The fixed seat 42 is fixedly installed on the outer side of the lower part of the valve body 11, the reducer 43 is fixedly installed on the front side of the fixed seat 42, the second drive motor 44 is fixedly installed on the front side of the reducer 43, the rear end of the output shaft of the second drive motor 44 is transmission-installed together with the input shaft of the reducer 43, the rear side of the reducer 43 is provided with a reduction box 47 fixedly installed in the fixed seat 42, the rear end of the output shaft of the reducer 43 passes through the front side of the reduction box 47 and a driving bevel gear 48 is fixedly installed, the left and right sides of the reduction box 47 are respectively provided with a left rotating hole and a right rotating hole, and the first output motor 45 is rotatably installed in the left rotating hole. Output shaft 51, the first output shaft 51 right end outer side is fixedly mounted with a first driven bevel gear 49 which meshes with the left portion of the driving bevel gear 48, the first output shaft 51 left end outer side is fixedly mounted with a first driving gear 45, the left portion of the left valve stem is fixedly mounted with a first driven gear 53 which meshes with the left portion of the first driving gear 45, the second output shaft 52 is rotatably mounted in the right rotating hole, the left end outer side of the second output shaft 52 is fixedly mounted with a second driven bevel gear 50 which meshes with the right portion of the driving bevel gear 48, the right end outer side of the second output shaft 52 is fixedly mounted with a second driving gear 46, the right portion of the right valve stem is fixedly mounted with a second driven gear 54 which meshes with the right portion of the second driving gear 46, and the second drive motor 44 is connected to the control unit.

[0131] According to the requirements, the second drive motor 44 is an existing well-known technology, such as a servo motor of the 130 series. According to the torque required for closing the valve core of the sucker rod 10, a motor with a power of 1.0-1.5KW and a torque greater than 5Nm is selected for matching. The electronic gear ratio of the servo motor driver can be set to 5:3, and it works in a speed control mode. The motor speed can be set at 2000 rpm. The reducer 43 can be an existing well-known ZE120 servo-specific planetary reducer. The input end flange is convenient for transmission connection with the output shaft of the second drive motor 44, and the output end is an optical axis.

[0132] In order to reduce the weight of the fixed seat 42, the fixed seat 42 includes two fixed clamps, which can be made of steel plates with a thickness of 3 mm. The front parts of the two fixed clamps are respectively mounted on the left outer side and the right outer side of the reduction box 47, and the rear parts of the two fixed clamps are respectively mounted on the left outer side and the right outer side of the valve body 11. The two fixed clamps are fixed together by a number of studs distributed at intervals along the circumference and nuts screwed to the left and right outer sides of the studs. A limiting sleeve is mounted on the outer side of the studs corresponding to the position between the two fixed clamps. In order to prevent the fixed clamps from moving left and right, limiting steps are provided on the outer side of the valve body 11 on the right side of the left fixed clamp and on the left side of the right fixed clamp, or limiting blocks are mounted on the upper and lower outer sides of the valve body 11, and the left and right sides of the limiting blocks are parallel to each other.

[0133] The outer side of the left part of the left valve stem corresponding to the left position of the first sealing cover 40 and the first driven gear 53 are connected through a key transmission, and the outer side of the left valve stem corresponding to the left end and right end of the first driven gear 53 are installed with a retaining spring 28, and the installation method between the right valve stem and the second driven gear 54 is the same as the installation method between the first driven gear 53 and the left valve stem.

[0134] The second drive motor 44 can achieve power output of deceleration and torque increase through a reduction mechanism, and realizes the biaxial counter-rotation of the first output shaft 51 and the second output shaft 52 through the active bevel gear 48, the first driven bevel gear 49 and the second driven bevel gear 50, and drives the left valve stem and the right valve stem to rotate respectively through the first active gear 45, the first driven gear 53, the second active gear 46 and the second driven gear 54. The left valve stem and the right valve stem have the same structure and are symmetrically arranged, so that the rotation directions of the left valve stem and the right valve stem are opposite, but the feeding directions of the left valve stem and the right valve stem are approaching or moving away from each other. By controlling the rotation of the second drive motor 44, the first sealing valve core 12 and the second sealing valve core 13 can be in sealing contact with the outer side of the sucker rod 10 after approaching each other, or can be separated from the sucker rod 10 after moving away from each other.

[0135] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figure 6 , 8 As shown in 10, 16 to 18, 20, and 21, the left valve stem includes a connecting plate 55 and a pull rod 56. The outer side of the right part of the pull rod 56 is screwed into the left threaded hole. A circular connecting plate 55 is fixedly installed on the left end of the first sealing valve core 12. A connecting groove opening to the left is provided on the left end of the connecting plate 55. The connecting groove includes a disassembly section 57 and a rotation section 58. The disassembly section 57 is in an arc shape with an opening downward, and the rotation section 58 is in a U shape with an opening upward. The lower part of the disassembly section 57 is connected to the upper part of the rotation section 58. The outer side of the right end of the pull rod 56 is screwed into the left threaded hole. A right limiting ring platform 60 is fixed on the side and is rotatably installed on the inner side of the lower part of the rotating section 58. A U-shaped limiting platform 61 with an opening upward is fixed on the inner side of the left part of the rotating section 58 corresponding to the left end position of the right limiting ring platform 60. An annular left limiting ring platform 59 is fixed on the outer side of the right part of the pull rod 56 between the left side of the limiting platform 61 and the right side of the first sealing end cover 32. The first driven gear 53 is fixedly installed on the outer side of the left part of the pull rod 56 on the left side of the first sealing cover 40. The right valve stem has the same structure as the left valve stem and is symmetrically arranged.

[0136] According to the requirements, the disassembly section 57 is in an arc shape with the opening downward. During use, the pull rod 56 can move left and right under the action of the left threaded hole when rotating. By setting the rotating section 58, the right end of the pull rod 56 can drive the connecting plate 55 to move left and right in the rotating section 58, thereby driving the first sealing valve core 12 to move left and right. In order to increase the connection strength between the connecting plate 55 and the first sealing valve core 12, a connecting groove is provided at the left end of the first sealing valve core 12, and a connecting column is provided in the connecting groove to fix the left end and the right end of the connecting plate 55 together. The left valve stem is divided into sections, which can reduce the processing difficulty of the left valve stem and facilitate the installation between the left valve stem and the first sealing valve core 12. By setting the disassembly section 57, the first sealing end cover 32 is removed. After that, move the pull rod 56 upward so that the right limit ring 60 at the right end of the pull rod 56 is located in the disassembly section 57, so that the right limit ring 60 is separated from the limit platform 61, and the right limit ring 60 is no longer constrained by the limit platform 61. Then move the pull rod 56 to the left to separate the pull rod 56 and the connecting plate 55 from each other, insert the right end of the pull rod 56 into the disassembly section 57, and then move the pull rod 56 downward so that the limit platform 61 is stuck on the outside of the pull rod 56 between the left limit ring 59 and the right limit ring 60, and then fix the first sealing end cover 32 to the left end of the valve body 11 to realize the assembly of the left valve stem, and similarly, the assembly of the right valve stem is realized.

[0137] When the second drive motor 44 is working, it drives the right valve stem and the left valve stem to rotate, and the second drive motor 44 drives the pull rod 56 to rotate. When the pull rod 56 rotates, it moves to the right under the action of the left threaded hole, and the left limit ring platform 59 presses the left side of the limit platform 61, thereby driving the connecting plate 55 and the first sealing valve core 12 to move to the right, and similarly the second sealing valve core 13 moves to the left, so that the first sealing valve core 12 and the second sealing valve core 13 can be close to each other and in sealing contact with the outer side of the sucker rod 10. When the second drive motor 44 drives the right valve stem and the left valve stem to rotate in the opposite direction, the second drive motor 44 drives the pull rod 56 to rotate in the opposite direction. When the pull rod 56 rotates in the opposite direction, it moves to the left under the action of the left threaded hole, and the right limit ring platform 60 presses the right side of the limit platform 61, thereby driving the connecting plate 55 and the first sealing valve core 12 to move to the left, and similarly the second sealing valve core 13 moves to the right, so that the first sealing valve core 12 and the second sealing valve core 13 can be moved away from each other. The sucker rod 10.

[0138] Embodiment 10: As an optimization of the above embodiment, as shown in the attached Figures 6 to 10 As shown in FIGS. 16 to 18 , the difference between the tooth width of the first driving gear 45 and the tooth width of the first driven gear 53 is not less than 15 mm, the difference between the tooth width of the second driving gear 46 and the tooth width of the second driven gear 54 is not less than 15 mm, and the inner wall of the guide groove 30 can contact the outer side of the sucker rod 10 before the guide portion 31.

[0139] The power of the reducer 43 is transmitted through the first output shaft 51 and the second output shaft 52. The first output shaft 51 and the second output shaft 52 are respectively connected to the left valve stem and the right valve stem through a gear pair.

[0140] During the oil well production process, the sucker rod 10 cannot be kept at the center of the sucker rod mounting hole 14. When the deviation is large, the transmission ratio between the left valve stem and the first output shaft 51 is 1.25:1, the gear ratio between the first driving gear 45 and the first driven gear 53 is 1:1.25, the transmission ratio between the right valve stem and the second output shaft 52 is 1.5:1, and the gear ratio between the second driving gear 46 and the second driven gear 54 is 1:1.5. In this way, when the rotation speeds of the first output shaft 51 and the second output shaft 52 are the same, the rotation speeds of the left valve stem and the right valve stem are different. Since the transmission ratio between the right valve stem and the second output shaft 52 is 1.5:1, and the transmission ratio between the left valve stem and the first output shaft 51 is 1.25:1, the rotation speed of the right valve stem is slower than that of the left valve stem.

[0141] When the first sealing valve core 12 and the second sealing valve core 13 are close to each other to close the sucker rod mounting hole 14, the length of the second sealing valve core 13 is 102 mm, the distance between the left end of the first sealing valve core 12 and the right end of the guide portion 31 is 96 mm, and the distance between the right end of the guide portion 31 and the sucker rod 10 is greater than the distance between the left end of the second sealing valve core 13 and the sucker rod 10. The guide groove 30 will approach the sucker rod 10 before the guide portion 31. At this time, if the sucker rod 10 is not at the center of the sucker rod mounting hole 14, the eccentric sucker rod 10 will pass through the inner wall of the guide groove 30 and move to the second The inner right side of the sealing groove 16 makes the sucker rod 10 located in the center of the sucker rod mounting hole 14. The left valve stem rotates quickly. Although the first sealing valve core 12 is far away from the sucker rod 10, it moves toward the sucker rod 10 quickly. Finally, the eccentric sucker rod 10 can be tightly clamped by the successive movements of the first sealing valve core 12 and the second sealing valve core 13, so that the sucker rod 10 is located in the center of the sucker rod mounting hole 14. When the sucker rod 10 needs to be released, the left valve stem rotates quickly, and the guide portion 31 will move away from the contact surface of the sucker rod 10 before the guide groove 30, and the guide groove 30 will then leave the contact surface of the sucker rod 10.

[0142] Since the diameter of the sucker rod 10 is 25 mm and the central diameter of the sucker rod mounting hole 14 is 52 mm, the moving distance of the left valve stem and the right valve stem is about 13.5 mm. When the first sealing valve core 12 and the second sealing valve core 13 are worn (leakage occurs after the first sealing valve core 12 and the second sealing valve core 13 contact the outer side of the sucker rod 10), it is necessary to increase the moving distance of the first sealing valve core 12 and the second sealing valve core 13, thereby the tooth width of the first driving gear 45 and the second driving gear 46 can be set to 60 mm, and the tooth width of the first driven gear 53 and the second driven gear 54 can be set to 15 mm, so that the maximum adjustment distance of the left and right movement of the first driven gear 53 and the second driven gear 54 during the rotation process can be 30 mm, which can meet the requirement of still being able to seal the outer side of the sucker rod 10 when leakage occurs later.

[0143] Embodiment 11: As an optimization of the above embodiment, as shown in the attached Figure 6 , 8 As shown in 10, 16, and 22, the second drive assembly also includes a first control module. A left connecting frame 62 is fixedly installed on the left end of the first sealing end cover 32. A first travel switch 63 and a second travel switch 64 are fixedly installed in the left connecting frame 62 corresponding to the left and right positions of the first driving gear 45, respectively. The first travel switch 63 and the second travel switch 64 are both connected to the first control module, and the first control module is respectively connected to the first drive motor 21, the second drive motor 44, and the control unit.

[0144] According to the requirements, the first travel switch 63 and the second travel switch 64 are both existing well-known travel switches, such as the model LXW5-11D1 micro switch, the first control module is an existing well-known programmable controller, the first control module can be fixedly installed in the explosion-proof box 4, the first drive motor 21 and the second drive motor 44 are connected to the control unit through the first control module, the first sealing end cover 32 and the left end of the valve body 11 are fixedly installed together by a plurality of connecting bolts distributed along the circumference. In order to improve the sealing performance between the first sealing end cover 32 and the left end face of the valve body 11, a sealing gasket is provided between the right end of the first sealing end cover 32 and the left end of the valve body 11. In order to facilitate the disassembly and assembly of the first driven gear 53, the left connecting frame 62 is left The Z-shaped portion is located above the first driven gear 53, the upper portion of the first stroke switch 63 is fixedly installed with the left end of the left connecting frame 62 by connecting screws, and the right end of the left connecting frame 62 is provided with connecting holes that pass through the left and right sides, so that the left connecting frame 62, the first sealing end cover 32 and the left end surface of the valve body 11 can be used to fix the left connecting frame 62, the first sealing end cover 32 and the valve body 11 together. If it is necessary to remove the first driven gear 53, it is only necessary to loosen the connecting screws between the first stroke switch 63 and the left connecting frame 62, rotate the left portion of the left connecting frame 62, so that the first stroke switch 63 is located at the upper left side of the first driven gear 53, or remove the first stroke switch 63 to carry out the disassembly operation of the first driven gear 53.

[0145] The first stroke switch 63 and the second stroke switch 64 are fixedly installed on the inner side of the left part of the left connecting frame 62. In order to facilitate the adjustment of the position of the second stroke switch 64, an adjusting screw hole can be set on the right part of the left connecting frame 62, and the connecting screw of the second stroke switch 64 is screwed into the adjusting screw hole. In this way, the position of the second stroke switch 64 can be adjusted by rotating the connecting screw, and the adjustment is more convenient. In order to fix the second stroke switch 64, a locking nut can be screwed on the outer side of the connecting screw at the right part of the left connecting frame 62. The left connecting frame 62 can also be symmetrically fixedly installed on the right end of the second sealing end cover 33.

[0146] Handles are fixedly installed on the outer side of the left end of the pull rod 56 and the outer side of the right end of the right valve stem. In this way, when a power outage or an unexpected failure occurs, the first driven gear 53 and the first driving gear 45, the second driven gear 54 and the second driving gear 46 are separated from each other, and the first sealing valve core 12 and the second sealing valve core 13 can be moved closer to or away from each other by turning the handle.

[0147] When the first sealing valve core 12 and the second sealing valve core 13 are close to each other to close the sucker rod mounting hole 14, the length of the second sealing valve core 13 is 96 mm, the distance between the left end of the first sealing valve core 12 and the right end of the guide portion 31 is 102 mm, and the distance between the right end of the guide portion 31 and the sucker rod 10 is greater than the distance between the left end of the second sealing valve core 13 and the sucker rod 10. The guide groove 30 will approach the sucker rod 10 before the guide portion 31. At this time, if the sucker rod 10 is not at the center of the sucker rod mounting hole 14, the eccentric sucker rod 10 will pass through the inner wall of the guide groove 30 and move to the second The inner right side of the sealing groove 16 makes the sucker rod 10 located in the center of the sucker rod mounting hole 14, and the left valve stem rotates quickly. Although the first sealing valve core 12 is far away from the sucker rod 10, it moves toward the sucker rod 10 quickly. Finally, the eccentric sucker rod 10 can be clamped by the successive movement of the first sealing valve core 12 and the second sealing valve core 13, so that the sucker rod 10 is located in the center of the sucker rod mounting hole 14. When the first driven gear 53 touches the contact of the second travel switch 64, the first control module receives the feedback signal and sends a command at the same time to stop the second drive motor 44 from rotating.

[0148] When the sucker rod 10 needs to be loosened, the left valve stem rotates faster, and the guide portion 31 will move away from the contact surface of the sucker rod 10 before the guide groove 30, and the guide groove 30 will then leave the contact surface of the sucker rod 10. When the first driven gear 53 touches the contact of the second travel switch 64, the first control module receives a feedback signal and issues an instruction at the same time, the second drive motor 44 stops rotating, the left connecting frame 62 can also be installed on the second sealing end cover 33, and the first travel switch 63 and the second travel switch 64 can also be triggered by the second driven gear 54.

[0149] Initially, the distance between the first travel switch 63 and the second travel switch 64 is 15 mm. When the first sealing valve core 12 and the second sealing valve core 13 are worn (leakage occurs after the first sealing valve core 12 and the second sealing valve core 13 contact the outer side of the sucker rod 10), it is necessary to increase the moving distance of the first sealing valve core 12 and the second sealing valve core 13, and the stroke setting can be increased. The distance between the first travel switch 63 and the second travel switch 64 can be adjusted (the position of the second travel switch 64 can be adjusted left and right on the left connecting frame 62), so that the maximum adjustment distance of the left and right movement of the first driven gear 53 and the second driven gear 54 during the rotation process can be 30 mm, which can still seal the outer side of the sucker rod 10 when leakage occurs in the later stage.

[0150] The specific working process of this embodiment is: when the sucker rod 10 leaks or a steam blowout occurs, timely and reliable control can be performed to ensure the safe operation of the wellhead blowout preventer of the pumping unit in an unattended situation and reduce the occurrence of wellhead pollution incidents.

[0151] When the sucker rod 10 leaks or blowouts occur due to steam channeling, the control unit receives a second-level warning signal within 15 minutes after receiving the first-level warning signal, and then issues a wellhead leakage alarm message. At the same time, the control unit sends a valve closing command to the second drive motor 44 through the first control module. When the second drive motor 44 receives the valve closing command from the first control module, the output shaft of the second drive motor 44 rotates, and the speed is reduced and the torque is increased through the reducer 43. The output shaft of the reducer 43 drives the first output shaft 51 and the second output shaft 52 to rotate respectively through the driving bevel gear 48, the first driven bevel gear 49 and the second driven bevel gear 50. The first output shaft 51 rotates clockwise, driving the first driving gear 45 clockwise. The needle rotates, thereby driving the first driven gear 53 to rotate, so that the first sealing valve core 12 moves to the right to close the left part of the sucker rod mounting hole 14, and the second output shaft 52 rotates counterclockwise at the same time, driving the second driving gear 46 to rotate counterclockwise, thereby driving the second driven gear 54 to rotate so that the second sealing valve core 13 moves to the left and closes the right part of the sucker rod mounting hole 14. When the first driven gear 53 moves to the right to trigger the second stroke switch 64, the first sealing valve core 12 and the second sealing valve core 13 completely close the sucker rod mounting hole 14. If the control unit does not receive the second-level warning signal within 15 minutes after receiving the first-level warning signal, the wellhead leakage warning information is cancelled, and the command to close the valve is cancelled at the same time.

[0152] When the sucker rod mounting hole 14 needs to be closed, the control unit sends a valve opening instruction to the second drive motor 44 through the first control module. When the second drive motor 44 receives the valve opening instruction, the output shaft direction of the second drive motor 44 rotates, and the output shaft of the reducer 43 drives the first output shaft 51 and the second output shaft 52 to rotate through the active bevel gear 48, the first driven bevel gear 49 and the second driven bevel gear 50 respectively. The first output shaft 51 rotates counterclockwise, driving the first active gear 45 to rotate counterclockwise, thereby driving the first driven gear 53 to rotate so that the first sealing valve core 12 moves to the left to open the left part of the sucker rod mounting hole 14. At the same time, the second output shaft 52 rotates clockwise, driving the second active gear 46 to rotate clockwise, thereby driving the second driven gear 54 to rotate so that the second sealing valve core 13 moves to the right to open the right part of the sucker rod mounting hole 14. When the first driven gear 53 moves to the right to trigger the first travel switch 63, the first sealing valve core 12 and the second sealing valve core 13 completely open the sucker rod sealing hole 17.

[0153] When manual operation is required, the first driven gear 53 and the second driven gear 54 are removed, or the first driven gear 53 and the first driving gear 45, and the second driven gear 54 and the second driving gear 46 are separated from each other. By turning the handle, the first sealing valve core 12 and the second sealing valve core 13 can be moved closer to each other to close the sucker rod mounting hole 14 or moved away from each other to open the sucker rod mounting hole 14.

[0154] Embodiment 12: As another optimization of Embodiment 7, as shown in the attached Figures 23 to 30 As shown, the second drive assembly includes a left drive component, a right drive component and a second control module, the left drive component includes a left drive motor 65 and a first mounting bracket 67, the left valve stem includes a first push rod 69, a first top plate 71 and a first push rod 73, the right outer side of the first push rod 69 is screwed into the left threaded hole, a left mounting groove with an opening to the left is provided in the center of the left end of the first sealing valve core 12, the first push rod 73 is installed in the left mounting groove, the first top plate 71 which is clamped together with the right end of the first push rod 69 is fixedly installed on the left end of the first push rod 73, the first mounting bracket 67 is fixedly installed on the left end of the first sealing end cover 32, the left drive motor 65 is fixedly installed on the left end of the first mounting bracket 67, and the right end of the output shaft of the left drive motor 65 is drivingly connected with the left end of the first push rod 69;

[0155] The right drive assembly includes a right drive motor 66 and a second mounting bracket 68, the right valve stem includes a second push rod 70, a second top plate 72 and a second push rod 74, the left outer side of the second push rod 70 is screwed into the right threaded hole, a right mounting groove opening to the right is provided in the center of the right end of the second sealing valve core 13, a second push rod 74 is installed in the right mounting groove, the right end of the second push rod 74 is fixedly mounted with a second top plate 72 which is clamped together with the left end of the second push rod 70, the right end of the second sealing end cover 33 is fixedly mounted with a second mounting bracket 68, the right end of the second mounting bracket 68 is fixedly mounted with the right drive motor 66, the left end of the output shaft of the right drive motor 66 is transmission-connected with the right end of the second push rod 70, the control unit is connected with the second control module, and the second control module is respectively connected with the first drive motor 21, the left drive motor 65 and the right drive motor 66.

[0156] According to the requirements, the first control module is an existing well-known programmable control module, and the first control module can be fixedly installed in the explosion-proof box 4. The left drive motor 65 and the right drive motor 66 are both existing well-known technologies, such as a servo motor of the 130 series. The first drive motor 21, the left drive motor 65, and the right drive motor 66 are connected to the control unit through the second control module. In order to reduce the weight of the first mounting bracket 67, the first mounting bracket 67 includes four screws and four pull rod sleeves. An outer ring table is fixed to the outer side of the right end of the first sealing end cover 32, and a through hole corresponding to the base of the left drive motor 65 is provided at the left end of the outer ring table. The right end of each screw passes through the mounting hole of the base of the left drive motor 65 and is screwed with a right connecting nut. The left end of each screw passes through the through hole at the corresponding position and is A left connecting nut is threadedly connected, and a pull rod sleeve is mounted on the outer side of each screw corresponding to the right end of the left drive motor 65 and the left end of the mounting ring. The right end of the output shaft of the left drive motor 65 and the left end of the first push rod 69, as well as the left end of the output shaft of the right drive motor 66 and the right end of the second push rod 70 are all installed together through the existing well-known transmission sleeve transmission. The inner sides of the first ends of the two transmission sleeves are key-connected with the outer sides of the right end of the output shaft of the left drive motor 65 and the outer sides of the left end of the output shaft of the right drive motor 66, respectively. The cross-section of the inner sides of the second ends of the two transmission sleeves is square, and the outer sides of the left end of the left valve stem and the right end of the right valve stem are both squares that match the inner sides of the second ends of the transmission sleeves. The outer sides of the left end of the left valve stem and the outer sides of the right end of the right valve stem are respectively inserted into the inner sides of the second ends of the transmission sleeves at the corresponding positions.

[0157] The control unit can control the left drive motor 65 and the right drive motor 66 through the first control module to close or open the first sealing valve core 12 and the second sealing valve core 13 on both sides of the sucker rod 10. The servo motor is used to control the opening operation of the first sealing valve core 12 and the second sealing valve core 13, so that the first sealing valve core 12 and the second sealing valve core 13 can achieve the closing action more accurately, and can also realize the time when the first sealing valve core 12 and the second sealing valve core 13 reach the sucker rod 10. When the sucker rod 10 is not in the center of the sucker rod mounting hole 14, the second sealing valve core 12 and the second sealing valve core 13 are opened. The valve core 13 contacts the outer side of the sucker rod 10 before the first sealing valve core 12. After the sucker rod 10 contacts the inner wall of the guide groove 30, it moves into the second sealing groove 16 under the action of the arc-shaped inner wall of the guide groove 30, so that the sucker rod 10 is located in the center of the sucker rod mounting hole 14. The first sealing valve core 12 moves leftward again to achieve the sealing effect on the outer side of the sucker rod 10. When the first sealing valve core 12 and the second sealing valve core 13 fail, they can also be replaced with the existing known light sealing valve core of the gate blowout preventer, so that the two sealing valve cores are close to the outer side of the rear sealing sucker rod 10.

[0158] The specific working process of this embodiment is as follows: when the sucker rod 10 leaks or a steam blowout occurs, the control unit receives a second-level warning signal within 15 minutes after receiving the first-level warning signal, and then issues a wellhead leakage alarm message. At the same time, the control unit sends a valve closing instruction to the left drive motor 65 and the right drive motor 66 through the second control module. When the left drive motor 65 and the right drive motor 66 receive the valve closing instruction from the second control module, they will drive the left valve stem and the right valve stem to rotate. When the output shafts of the left drive motor 65 and the right drive motor 66 reach the set torque value, the left drive motor 65 and the right drive motor 66 stop rotating, thereby achieving the purpose of closing the valve cores on both sides of the sucker rod 10. If the control unit does not receive a second-level warning signal within 15 minutes after receiving the first-level warning signal, the wellhead leakage warning message is cancelled, and the valve closing instruction is cancelled at the same time.

[0159] When it is necessary to close the sucker rod mounting hole 14, the control unit sends a valve closing instruction to the left drive motor 65 and the right drive motor 66 through the second control module. When the left drive motor 65 and the right drive motor 66 receive the valve opening instruction from the second control module, they will drive the left valve stem and the right valve stem to rotate in the opposite direction. When the output shafts of the left drive motor 65 and the right drive motor 66 reach the set number of turns, the left drive motor 65 and the right drive motor 66 stop rotating, thereby achieving the purpose of opening the valve cores on both sides of the sucker rod 10.

[0160] Embodiment 13: As an optimization of the above embodiment, this embodiment is a clamping method between the first push rod 69 and the first top plate 71 and the second push rod 70 and the second top plate 72, as shown in the attached Fig.23 , 24 As shown in , 26 to 29, 31 to 34, a left card slot opening to the left is provided at the left end of the first top plate 71, and the left card slot includes a left take-out section 75 and a left limit section 77, the left take-out section 75 is in an arc shape opening downward, and the left limit section 77 is in a U shape opening upward, and the lower part of the left take-out section 75 is connected to the upper part of the left limit section 77, and a first limit plate 79 rotatably mounted on the inner side of the lower part of the left limit section 77 is fixedly installed on the right end of the first push rod 69, and a U-shaped left limit boss 83 opening upward is fixedly installed on the inner side of the left limit section 77 corresponding to the left side of the first limit plate 79, and a second annular limit plate 80 is fixedly installed on the outer side of the right part of the first push rod 69 between the left side of the left limit boss 83 and the right side of the first sealing end cover 32;

[0161] The second top plate 72 is provided with a right slot opening to the right at the right end, and the right slot includes a right removal section 76 and a right limiting section 78. The right removal section 76 is in an arc shape opening downward, and the right limiting section 78 is in a U shape opening upward. The lower portion of the right removal section 76 and the upper portion of the right limiting section 78 are communicated with each other, and a third limiting plate 81 rotatably mounted on the inner side of the lower portion of the right limiting section 78 is fixedly installed on the left end of the second push rod 70, and a U-shaped right limiting boss 84 opening upward is fixedly installed on the inner side of the right portion of the right limiting section 78 corresponding to the right side position of the third limiting plate 81, and a fourth annular limiting plate 82 is fixedly installed on the outer side of the left portion of the second push rod 70 at a position between the right side of the right limiting boss 84 and the left side of the second sealing end cover 33.

[0162] According to the requirements, the left extraction section 75 and the right extraction section 76 are both in the shape of an arc with the opening downward, and the first limit plate 79 and the third limit plate 81 are both circular. During use, the first push rod 69 can move left and right under the action of the left threaded hole when it rotates. By setting the left limit section 77, the right end of the first push rod 69 can drive the first top plate 71 to move left and right in the left limit section 77, thereby driving the first top rod 73 and the first sealing valve core 12 to move left and right. The left valve stem is divided into sections, which can reduce the processing difficulty of the left valve stem and facilitate the installation between the left valve stem and the first sealing valve core 12. By setting the left extraction section 75, after removing the first sealing end cover 32, the first push rod 69 is moved upward so that the first limit plate 79 at the right end of the first push rod 69 is located in the left extraction section 77. 5, so that the first limit plate 79 and the left limit boss 83 are separated from each other, and the first limit plate 79 is no longer constrained by the left limit boss 83, and then the first push rod 69 is moved leftward to separate the first push rod 69 and the first top plate 71 from each other, and the right end of the first push rod 69 is inserted into the left removal section 75, and then the first push rod 69 is moved downward, so that the left limit boss 83 is stuck on the outside of the first push rod 69 between the first limit plate 79 and the second limit plate 80, and then the first sealing end cover 32 is fixedly installed with the left end of the valve body 11 to realize the assembly of the left valve stem, and the assembly of the right valve stem can be realized in the same way.

[0163] When the output shaft of the left driving motor 65 rotates, the first push rod 69 is driven to rotate. When the first push rod 69 rotates, it moves to the right under the action of the left threaded hole, and the second limit plate 80 presses the left side of the left limit boss 83, thereby driving the first push rod 73 and the first sealing valve core 12 to move to the right. Similarly, when the output shaft of the right driving motor 66 rotates, the second sealing valve core 13 moves to the left, so that the first sealing valve core 12 and the second sealing valve core 13 can be close to each other and sealed to the outside of the sucker rod 10. When the output shaft of the left drive motor 65 rotates in the opposite direction, the first push rod 69 is driven to rotate in the opposite direction. When the first push rod 69 rotates in the opposite direction, it moves to the left under the action of the left threaded hole, and the first limit plate 79 presses the right side of the left limit boss 83, thereby driving the first push rod 73 and the first sealing valve core 12 to move to the left. Similarly, when the output shaft of the right drive motor 66 rotates in the opposite direction, the second sealing valve core 13 moves to the right, so that the first sealing valve core 12 and the second sealing valve core 13 can be moved away from the sucker rod 10.

[0164] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A wellhead leakage early warning method, applied to a wellhead intelligent leakage prevention system, characterized in that The wellhead intelligent anti-leakage system includes a wellhead leakage alarm device, a packing gland, a first sealing valve core, a second sealing valve core, a first drive assembly, a second drive assembly and a cross-shaped valve body. The wellhead leakage alarm device includes a leakage sensor, a reversible battery, a control unit, a storage box, a liquid level sensor and a camera. The upper end of the storage box is provided with a sucker rod hole for installing a sucker rod; The wellhead leakage early warning method includes the following steps: S1, fix the storage box on the upper end of the packing gland so that the sucker rod passes through the sucker rod hole, and install a sealing ring inside the sucker rod hole; S2, fix the explosion-proof box and the storage box together, and fix the monitoring frame on one side of the wellhead; S3, start the wellhead leakage alarm device, and the leakage sensor and liquid level sensor collect liquid data in the storage box; when the produced fluid splashes onto the surface of the leakage sensor in the storage box, the leakage sensor sends a leakage instruction to the control unit, the control unit sends a start instruction to the transmitting module, the transmitting module sends a signal to the receiving module, the receiving module sends a signal to the processing module, the processing module collects the image information of the upper outer side of the storage box through the camera, and judges whether the packing gland is leaking according to the image information. If leakage occurs, the processing module will send a first-level warning signal to the control unit; When the produced fluid leaks and flows into the storage box, and the liquid level sensor determines that the liquid level of the produced fluid flowing into the storage box is greater than or equal to the set value, a secondary warning signal is sent to the control unit; When the produced fluid leaks and flows into the storage box, and the liquid level sensor determines that the liquid level and the salinity value of the produced fluid flowing into the storage box are both greater than or equal to the set value, the liquid level sensor sends a third-level warning signal to the control unit; S4, the control unit releases alarm information based on the warning signal reception time and warning signal level; A sucker rod mounting hole is provided in the center of the upper end of the valve body, which passes through from top to bottom. The lower end of the storage box of the wellhead leakage alarm device is fixedly installed on the upper end of the packing gland. The sucker rod hole and the sucker rod mounting hole are connected to each other. A first sealing hole is provided at the left end of the lower part of the valve body, and the right end of the valve body corresponding to the position of the first sealing hole is provided with a second sealing hole whose left end is connected with the sucker rod mounting hole. A first sealing valve core is sleeved in the first sealing hole, a first sealing groove which passes through from top to bottom is provided at the right end of the first sealing valve core, a second sealing valve core is sleeved in the second sealing hole, and a second sealing groove which passes through from top to bottom is provided at the left end of the second sealing valve core. When the first sealing valve core and the second sealing valve core contact with each other, a sucker rod sealing hole which matches the sucker rod can be formed. A second driving assembly which can make the first sealing valve core and the second sealing valve core approach or move away from each other is provided on the outer side of the lower part of the valve body, and the first driving assembly and the second driving assembly are both connected to the control unit; The left end of the second sealing valve core is provided with an arc-shaped guide groove which runs through from top to bottom and opens to the left, and the right end of the first sealing valve core corresponding to the front and rear sides of the first sealing groove is fixedly installed with a guide part.

2. The wellhead leakage early warning method according to claim 1, characterized in that: Step S4, the control unit releases alarm information based on the warning signal reception time and the warning signal level, including: When the control unit receives the first-level warning signal at time t1, the control unit issues a wellhead leakage warning and inspection prompt information; When the control unit receives the second-level warning signal at time t2, it determines the time when the control unit receives the third-level warning signal, marks it as time t3, and determines whether time t3 is less than or equal to t2+K, where K is the time setting value. If so, the control unit issues a wellhead leakage alarm message, and determines the wellhead leakage speed information based on the time difference between time t3 and time t2, and issues an alarm message; If not, the control unit sends a reminder message to clean the water accumulated in the wellhead storage box.

3. The wellhead leakage early warning method according to claim 1 is characterized in that A sealing packing is arranged on the inner side of the upper part of the valve body, a compression sleeve is installed on the upper end of the sealing packing, a packing gland is screwed on the outer side of the upper end of the valve body, and a first driving assembly is arranged on the outer side of the upper part of the valve body, which can rotate the packing gland and compress the sealing packing through the compression sleeve.

4. The wellhead leakage early warning method according to claim 3 is characterized in that The first drive assembly includes a support plate, a first drive motor, an adjusting screw and a self-tightening driving gear. A symmetrically distributed left mounting step and a right mounting step are provided on the outer side of the left and right parts of the valve body corresponding to the position below the packing gland. A mounting hole is provided on the upper side of the front of the support plate, and the left inner wall and the right inner wall of the mounting hole are both vertical surfaces. The distance between the left inner wall and the right inner wall of the mounting hole is the same as the distance between the vertical surfaces of the left mounting step and the right mounting step. The support plate is seated on the left mounting step and the right mounting step. An adjusting screw hole is provided on the front side of the support plate and is connected to the front side of the valve body corresponding to the position of the adjusting screw hole. An adjusting screw screw is screwed in the adjusting screw hole and is screwed in the limiting screw hole on the outer side of the rear side. The first drive motor is fixedly installed on the lower side of the rear of the support plate. The output shaft of the first drive motor passes through the upper side of the support plate and is fixedly installed with the self-tightening driving gear. The outer side of the lower part of the packing gland is detachably fixedly installed with a self-tightening driven gear meshing with the outer side of the upper part of the self-tightening driving gear. The first drive motor is connected to the control unit.

5. The wellhead leakage early warning method according to claim 3 or 4, characterized in that The right portion of the guide groove is connected to the left portion of the second sealing groove, and the first sealing groove, the guide portion and the second sealing groove can form a sucker rod sealing hole.

6. The wellhead leakage early warning method according to claim 5, characterized in that A first sealing end cover is fixedly installed at the left end of the lower part of the valve body, a left threaded hole is provided in the center of the first sealing end cover, a left valve stem whose right end is fixedly installed with the first sealing valve core is threadedly connected in the left threaded hole, the left end of the left valve stem is installed together with the corresponding position of the second driving assembly, a first sealing sleeve which is sleeved on the outer side of the left part of the left valve stem is fixedly installed on the left end of the first sealing end cover, a first sealing packing is sleeved in the first sealing sleeve, a first compression sleeve is installed on the left end of the first sealing packing, a first sealing gland is threadedly connected to the outer side of the first sealing sleeve, and the inner side of the left part of the first sealing gland abuts against the left end of the first compression sleeve; A second sealing end cover is fixedly installed on the right end of the lower part of the valve body, and a right threaded hole is provided in the center of the second sealing end cover, and a right valve stem whose left end is fixedly installed with the second sealing valve core is threadedly connected in the right threaded hole, and the right end of the right valve stem is installed together with the corresponding position of the second driving assembly, and a second sealing sleeve which is sleeved on the outer side of the right part of the right valve stem is fixedly installed on the right end of the second sealing end cover, and a second sealing packing is sleeved in the second sealing sleeve, and a second compression sleeve is installed on the right end of the second sealing packing, and a second sealing gland is threadedly connected to the outer side of the second sealing sleeve, and the inner side of the right part of the second sealing gland abuts against the right end of the second compression sleeve.

7. The wellhead leakage early warning method according to claim 6 is characterized in that The second drive assembly includes a fixed seat, a reducer, a second drive motor, a first driving gear and a second driving gear. A fixed seat is fixedly installed on the outer side of the lower part of the valve body, a reducer is fixedly installed on the front side of the fixed seat, a second drive motor is fixedly installed on the front side of the reducer, the rear end of the output shaft of the second drive motor is driven and installed together with the input shaft of the reducer, a reduction box fixedly installed in the fixed seat is provided on the rear side of the reducer, a driving bevel gear is fixedly installed on the rear end of the output shaft of the reducer after passing through the front side of the reduction box, a left rotating hole and a right rotating hole are respectively provided on the left and right sides of the reduction box, the first output shaft is rotatably installed in the left rotating hole, and the first output shaft A first driven bevel gear meshing with the left part of the driving bevel gear is fixedly installed on the outer side of the right end, a first driving gear is fixedly installed on the outer side of the left end of the first output shaft, a first driven gear meshing with the left part of the first driving gear is fixedly installed on the outer side of the left part of the left valve stem, a second output shaft is rotatably installed in the right rotating hole, a second driven bevel gear meshing with the right part of the driving bevel gear is fixedly installed on the outer side of the left end of the second output shaft, a second driving gear is fixedly installed on the outer side of the right end of the second output shaft, a second driven gear meshing with the right part of the second driving gear is fixedly installed on the outer side of the right part of the right valve stem, and a second driving motor is connected to the control unit; Alternatively, the second drive assembly includes a left drive component, a right drive component and a second control module, the left drive component includes a left drive motor and a first mounting bracket, the left valve stem includes a first push rod, a first top plate and a first push rod, the outer side of the right portion of the first push rod is screwed into the left threaded hole, a left mounting groove with an opening to the left is provided in the center of the left end of the first sealing valve core, the first push rod is installed in the left mounting groove, the first top plate which is clamped together with the right end of the first push rod is fixedly installed on the left end of the first push rod, the first mounting bracket is fixedly installed on the left end of the first sealing end cover, the left drive motor is fixedly installed on the left end of the first mounting bracket, and the right end of the output shaft of the left drive motor is drivingly connected with the left end of the first push rod; The right driving assembly includes a right driving motor and a second mounting bracket, the right valve stem includes a second push rod, a second top plate and a second push rod, the left outer side of the second push rod is screwed into the right threaded hole, a right mounting groove opening to the right is provided in the center of the right end of the second sealing valve core, the second push rod is installed in the right mounting groove, the right end of the second push rod is fixedly mounted with a second top plate clamped together with the left end of the second push rod, the right end of the second sealing end cover is fixedly mounted with a second mounting bracket, the right end of the second mounting bracket is fixedly mounted with the right driving motor, the left end of the output shaft of the right driving motor is transmission-connected with the right end of the second push rod, the control unit is connected with the second control module, and the second control module is respectively connected with the first driving motor, the left driving motor and the right driving motor.

8. The wellhead leakage early warning method according to claim 7 is characterized in that The left valve stem includes a connecting plate and a pull rod, the outer side of the right part of the pull rod is screwed into the left threaded hole, a circular connecting plate is fixedly installed on the left end of the first sealing valve core, a connecting groove opening to the left is provided on the left end of the connecting plate, the connecting groove includes a disassembly section and a rotating section, the disassembly section is in an arc shape opening downward, the rotating section is in a U shape opening upward, the lower part of the disassembly section and the upper part of the rotating section are connected to each other, a right limiting ring platform rotatably installed on the inner side of the lower part of the rotating section is fixed on the outer side of the right end of the pull rod, a U-shaped limiting platform opening upward is fixed on the inner side of the left part of the rotating section corresponding to the left end position of the right limiting ring platform, an annular left limiting ring platform is fixedly installed on the outer side of the right part of the pull rod between the left side of the limiting platform and the right side of the first sealing end cover, the first driven gear is fixedly installed on the outer side of the left part of the pull rod on the left side of the first sealing gland, the right valve stem has the same structure as the left valve stem and is symmetrically arranged; Or / and, the second drive assembly also includes a first control module, a left connecting frame is fixedly installed on the left end of the first sealing end cover, and a first travel switch and a second travel switch are fixedly installed in the left connecting frame corresponding to the left and right positions of the first driving gear, respectively, and the first travel switch and the second travel switch are both connected to the first control module, and the first control module is respectively connected to the first drive motor, the second drive motor, and the control unit.

Images