A mounted position sensing digitizing wellhead

Abstract

The application relates to the technical field of wellhead control devices, and discloses a digital wellhead device with an installation position sensor, which comprises a gas production wellhead, the gas production wellhead is fixedly installed on the ground, the gas production wellhead is communicated with a gas production well, a bearing shoulder is arranged on the inner wall of the gas production wellhead, and the diameter of the bearing shoulder increases upwards along the axis direction of the gas production wellhead, when the gas pressure in the annular space exceeds a threshold value, the driving assembly drives the first sealing plug and the second sealing plug to move in linkage, the buffer cavity and the communicating pipe and the negative pressure cavity are alternately connected and disconnected, the high-pressure gas in the annular space is allowed to enter the buffer cavity to preliminarily release pressure, and then the gas in the buffer cavity is discharged through the negative pressure of the negative pressure cavity, intermittent pressure release circulation is formed, the problems of false high of cement slurry return liquid and side hole blockage caused by traditional full opening of the side hole are avoided, the problems of annular space pressure accumulation and hidden troubles of lifting and displacement of the suspension sleeve caused by full closing of the side hole are solved, and the quality of well cementing operation and the stability of the wellhead structure are ensured.

Description

Technical Field

[0001] This invention relates to the field of wellhead control device technology, and more specifically to a digital wellhead device with installation position sensing. Background Technology

[0002] Generally, during wellhead assembly and well completion operations, it is necessary to lower and position the suspension sleeve to ensure that it is stably attached to the surface of the load shoulder, thereby bearing the casing load and forming a multi-stage sealing structure. Subsequently, cementing operations are carried out to complete the annulus sealing and reinforcement, preventing wellbore medium leakage and interlayer fluid flow, while ensuring the overall pressure bearing capacity of the wellhead and meeting the long-term safe production and operation requirements of oil and gas.

[0003] In practical field applications, existing digital wellheads rely on position sensors for passive monitoring. While they can detect in real-time whether the suspension sleeve is properly installed and whether it has been lifted and displaced during cementing return, providing data detection and status feedback, they lack active control and structural stability mechanisms. Furthermore, existing wellheads generally have sidehole structures on their sidewalls for annular pressure monitoring, sealing pressure testing, emergency pressure relief, and subsequent maintenance. However, traditional sidehole connectivity is either fully open or completely closed. During annular cementing return via injection of cement slurry from inside the wellhead, as the cement slurry gradually rises and replaces the annular pressure, the annular pressure... The air and drilling fluid in the upper part of the annulus are continuously compressed. If the side hole is fully open throughout and the annulus is directly connected to the outside atmosphere, a stable pressure differential channel will be formed. This can easily cause the cement slurry to float back and become uncontrollable, leading to defects such as false high cementing return and side hole blockage. If the side hole is completely closed and the pressure is not released in time, a pressure buildup phenomenon will quickly form inside the sealed annulus. The abnormal back pressure combined with the buoyancy of the cement slurry will act on the suspension sleeve, greatly enhancing the upward lifting force. This will force the suspension sleeve to lift slightly, loosen and shift. Although this displacement change can be monitored and identified by the position sensor, it cannot prevent the component displacement caused by pressure imbalance from the source. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a digital wellhead device with installation position sensing, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions: A digital wellhead device with installation position sensing, comprising: A gas wellhead is fixedly installed on the ground and connected to a gas well. A bearing shoulder is provided on the inner wall of the gas wellhead, and the diameter of the bearing shoulder increases upward along the axis of the gas wellhead. A suspension sleeve is provided inside the gas wellhead and placed on the bearing shoulder. An annular groove is provided on the bearing shoulder, and multiple circumferentially arranged displacement sensors are fixedly installed in the annular groove. The detection end of the displacement sensor abuts against the suspension sleeve. A collection tube is fixedly installed at the bottom of the suspension sleeve. An annular space is formed between the suspension sleeve and the well wall of the gas well. A first side hole is provided on the gas wellhead and is connected to the annular space. A fixed cylinder is fixedly installed on the outer circumference of the gas wellhead. The fixed cylinder contains a negative pressure chamber and a buffer chamber, which are connected. A connecting pipe, communicating with the buffer chamber, is located at the end of the fixed cylinder facing the gas wellhead. This connecting pipe is connected to a first side hole. The end of the fixed cylinder away from the gas wellhead is connected to a suction assembly via a suction valve, which is connected to the negative pressure chamber. A first valve plate with a vent hole is fixedly installed at the connection point between the connecting pipe and the buffer chamber. A second valve plate with a vent hole is also fixedly installed at the connection point between the negative pressure chamber and the buffer chamber. A first sealing plug and a second sealing plug are slidably installed within the buffer chamber. The first sealing plug is slidably engaged with the vent hole of the first valve plate, and the second sealing plug is slidably engaged with the vent hole of the second valve plate. Both the first and second sealing plugs are driven to move by the drive assembly. When the drive assembly drives the first sealing plug to insert into the vent hole of the first valve plate to block the first valve plate, the connecting pipe is disconnected from the buffer chamber, and the second sealing plug moves away from the second valve plate, so that the negative pressure chamber is connected to the buffer chamber. When the drive assembly drives the first sealing plug away from the first valve plate, the connecting pipe is connected to the buffer chamber, and the second sealing plug is inserted into the vent hole of the second valve plate to block the second valve plate, so that the negative pressure chamber is disconnected from the buffer chamber. A pressure monitoring component is used to monitor the air pressure in the annulus. When the air pressure exceeds a threshold, the drive component drives the first sealing plug to block the first valve plate.

[0006] As a further aspect of the present invention: the first valve plate and the second valve plate have the same width, the first sealing plug and the second sealing plug have the same width, and the width of the first sealing plug is greater than the width of the vent hole on the first valve plate.

[0007] As a further embodiment of the present invention: the driving assembly includes a fixed vertical plate, a sliding frame, a permanent magnet, an electromagnet, and a linkage assembly. The fixed vertical plate is fixedly installed in the buffer cavity, a horizontal plate is fixedly installed on the fixed vertical plate, a round rod is slidably installed on the fixed vertical plate, the sliding frame is slidably installed on the horizontal plate, one end of the sliding frame is fixedly connected to the first sealing plug, the other end of the sliding frame is fixedly connected to the round rod, the permanent magnet is fixedly connected to the end of the round rod away from the sliding frame, the electromagnet is fixedly installed in the buffer cavity, and the electromagnet is connected to a power source through a wire. The power source is connected to a controller, and the sliding frame is connected to the linkage assembly. The linkage assembly drives the second sealing plug to rise and fall. When the electromagnet is energized, a repulsive force is generated between the electromagnet and the permanent magnet, pushing the permanent magnet to move away from the electromagnet, and simultaneously driving the round rod and the sliding frame to move towards the first valve plate, so that the first sealing plug seals the first valve plate. At this time, the sliding frame drives the second sealing plug away from the second valve plate through the linkage assembly.

[0008] As a further embodiment of the present invention: an extraction pipe is fixedly installed inside the fixed cylinder, the extraction pipe is connected to the negative pressure chamber, a negative pressure channel is opened in the gas wellhead, one end of the negative pressure channel is connected to the annular groove, and the other end of the negative pressure channel is connected to the extraction pipe.

[0009] As a further aspect of the present invention: the driving assembly further includes a spring, which is sleeved on the outer circular surface of the round rod with a gap between them. One end of the spring is connected to the permanent magnet, and the other end of the spring is connected to the fixed vertical plate. The preload of the spring causes the permanent magnet to approach the electromagnet, at which time the first sealing plug moves away from the first valve plate.

[0010] As a further aspect of the present invention: an elastic damper is fixedly installed on the fixed vertical plate, with the movable end of the elastic damper facing the sliding frame. When the electromagnet is de-energized, the spring preload pushes the permanent magnet closer to the electromagnet, simultaneously driving the round rod to move, and the round rod drives the sliding frame to abut against the movable end of the elastic damper.

[0011] As a further embodiment of the present invention: the linkage assembly includes a fixed frame, a square slide rod, a transmission shaft, an inclined groove, and a vertical groove. The fixed frame is fixedly installed in the buffer cavity and is located below the second valve plate. The square slide rod is slidably installed on the top of the fixed frame, and the top end of the square slide rod is fixedly connected to the second sealing plug. The transmission shaft is fixedly installed on the square slide rod. The inclined groove is opened on the sliding frame and is arranged at an angle. The horizontal height of the inclined groove near the first valve plate is higher than the horizontal height of the inclined groove away from the first valve plate. The vertical groove is opened on the fixed frame and is arranged vertically. The transmission shaft is slidably installed in the vertical groove and also slidably installed in the inclined groove.

[0012] As a further embodiment of the present invention: the gas pressure monitoring component includes a second side hole, a flange pipe and a gas pressure sensor. The second side hole is opened on the gas wellhead, and the second side hole and the first side hole are symmetrically arranged about the gas wellhead. The second side hole is connected to the annulus. The flange pipe is connected to the second side hole. The gas pressure sensor is connected to the flange pipe, and the gas pressure sensor and the flange pipe are detachably connected. The gas pressure sensor is connected to the controller.

[0013] The beneficial effects of this invention are: 1. In this invention, the gas pressure monitoring component monitors the gas pressure in the annulus in real time. When the gas pressure exceeds the threshold, the drive component drives the first sealing plug and the second sealing plug to move in tandem, realizing the alternating connection and disconnection of the buffer chamber, the connecting pipe, and the negative pressure chamber. First, the high-pressure gas in the annulus enters the buffer chamber for initial depressurization, and then the gas in the buffer chamber is discharged through the negative pressure of the negative pressure chamber, forming an intermittent depressurization cycle. This avoids the problems of false high cement slurry return and side hole blockage caused by the traditional fully open side hole, and at the same time solves the hidden dangers of annulus pressure buildup and suspension sleeve displacement caused by the fully closed side hole, ensuring the quality of cementing operations and the stability of the wellhead structure. 2. In this invention, the driving component drives the sliding frame to move through the repulsive force between the electromagnet and the permanent magnet, and the preload of the spring achieves the active reset of the first sealing plug. It does not need to rely on the passive push of the annular air pressure, which not only improves the pressure relief response speed, but also ensures that the first sealing plug and the first valve plate maintain a stable and large gap through the spring preload, thereby increasing the exhaust flow per unit time. This solves the problem of small gap and low exhaust efficiency in the traditional air pressure driving method. At the same time, the elastic damper can buffer the impact force of the sliding frame reset, avoid component impact and wear, and extend the service life of the device. 3. In this invention, the air extraction component creates a stable negative pressure in the negative pressure chamber. The negative pressure is transmitted to the annular groove through the air extraction pipe and negative pressure channel, generating a downward suction force on the suspension sleeve sitting on the bearing shoulder. This effectively counteracts the upward buoyancy of the cement slurry on the suspension sleeve and collection pipe during cementing return, achieving active stabilization. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 In this invention Figure 1 Enlarged structural diagram of part A in the middle; Figure 3 This is a schematic diagram of the structure of the second sealing plug sealing the second hollow plate in this invention; Figure 4 This is a schematic diagram of the structure of the second sealing plug being located away from the second hollow plate in this invention; Figure 5This is a schematic diagram of the structure of the fixed vertical plate in this invention; Figure 6 This is a schematic diagram of the disassembled fixing frame in this invention; Figure 7 This is a schematic diagram of the structure of the fixed cylinder in this invention.

[0016] In the diagram: 1. Gas wellhead; 2. Suspension sleeve; 3. Collection pipe; 4. Annulus; 5. Bearing shoulder; 6. Annular groove; 7. Displacement sensor; 8. First side hole; 9. Fixed cylinder; 901. Connecting pipe; 902. Negative pressure chamber; 903. Buffer chamber; 10. Extraction valve; 11. First valve plate; 1101. First sealing plug; 12. Second valve plate; 1201. Second sealing plug; 13. Fixed vertical plate; 14. Horizontal plate; 15. Sliding frame; 16. Round rod; 17. Permanent magnet; 18. Electromagnet; 1801. Wire; 19. Spring; 20. Fixing frame; 21. Square slide rod; 22. Drive shaft; 23. Inclined groove; 24. Vertical groove; 25. Elastic damper; 26. Extraction pipe; 27. Negative pressure channel; 28. Second side hole; 29. ​​Flange pipe; 30. Gas pressure sensor. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-7 As shown, the present invention is a digital wellhead device for installation position sensing, comprising: A gas wellhead 1 is fixedly installed on the ground and is connected to a gas well. A bearing shoulder 5 is provided on the inner wall of the gas wellhead 1. The diameter of the bearing shoulder 5 increases upward along the axis of the gas wellhead 1. A suspension sleeve 2 is provided inside the gas wellhead 1 and is placed on the bearing shoulder 5. An annular groove 6 is provided on the bearing shoulder 5. Multiple circumferentially arranged displacement sensors 7 are fixedly installed in the annular groove 6. The detection end of the displacement sensor 7 abuts against the suspension sleeve 2. A collection pipe 3 is fixedly installed at the bottom of the suspension sleeve 2. An annular space 4 is formed between the suspension sleeve 2 and the well wall of the gas well. A first side hole 8 is provided on the gas wellhead 1 and is connected to the annular space 4. A fixed cylinder 9 is fixedly installed on the outer circumference of the gas wellhead 1. The fixed cylinder 9 has a negative pressure chamber 902 and a buffer chamber 903 inside, which are connected. A connecting pipe 901, which communicates with the buffer chamber 903, is located at the end of the fixed cylinder 9 facing the gas wellhead 1. The connecting pipe 901 is connected to the first side hole 8. The end of the fixed cylinder 9 away from the gas wellhead 1 is connected to the suction assembly via a suction valve 10, which is connected to the negative pressure chamber 902. The connection point between the connecting pipe 901 and the buffer chamber 903 is fixedly installed... A first valve plate 11 with vent holes is provided. A second valve plate 12 with vent holes is fixedly installed at the connection between the negative pressure chamber 902 and the buffer chamber 903. A first sealing plug 1101 and a second sealing plug 1201 are slidably installed in the buffer chamber 903. The first sealing plug 1101 is slidably engaged with the vent hole of the first valve plate 11, and the second sealing plug 1201 is slidably engaged with the vent hole of the second valve plate 12. Both the first sealing plug 1101 and the second sealing plug 1201 are driven to move by a drive assembly. When the drive assembly drives the first sealing plug 1101... When the first valve plate 11 is blocked by inserting into the vent hole on the first valve plate 11, the connecting pipe 901 is disconnected from the buffer chamber 903, and the second sealing plug 1201 moves away from the second valve plate 12, so that the negative pressure chamber 902 is connected to the buffer chamber 903. When the drive assembly drives the first sealing plug 1101 away from the first valve plate 11, the connecting pipe 901 is connected to the buffer chamber 903, and the second sealing plug 1201 is inserted into the vent hole on the second valve plate 12 to block the second valve plate 12, so that the negative pressure chamber 902 is disconnected from the buffer chamber 903. A pressure monitoring component is used to monitor the air pressure inside the annulus 4. When the air pressure exceeds a threshold, the drive component drives the first sealing plug 1101 to block the first valve plate 11.

[0019] In one embodiment of this invention, it should be noted that the device of the present invention is applicable to wellhead installation operations of offshore and onshore oil and gas wells, and is particularly applicable to ultra-high pressure wellhead devices with a rated working pressure of up to 210 MPa. The gas extraction component and displacement sensor 7 described in the present invention are prior art, and the present invention does not improve them. Therefore, it is not necessary to disclose their specific mechanical structure and circuit structure, and this does not affect the integrity of the present invention.

[0020] The working principle of this invention is as follows: The suspension sleeve 2 is lowered into the gas wellhead 1, allowing it to sit stably on the bearing shoulder 5. The displacement sensor 7 in the annular groove 6 on the bearing shoulder 5 abuts against the suspension sleeve 2, monitoring its placement displacement and whether it is in place in real time. During cementing operations, cement slurry descends through the collection pipe 3 to the bottom of the well and fills the lower region of the annulus 4 from bottom to top. The air and drilling fluid in the upper part of the annulus 4 are continuously compressed. The gas pressure monitoring component monitors the gas pressure in the annulus 4 in real time. When the gas pressure exceeds the threshold, the air extraction component is activated, and the air is extracted from the negative pressure chamber 902 in the fixed cylinder 9 through the air extraction valve 10, so that the negative pressure chamber 902 forms a stable negative pressure. At the same time, the drive component drives the first sealing plug 1101 and the second sealing plug 1201 to move in tandem, realizing the linkage between the buffer chamber 903, the connecting pipe 901, and the negative pressure chamber 902. The alternating connection and disconnection of the drive assembly first drives the first sealing plug 1101 away from the first valve plate 11 and the second sealing plug 1201 to block the second valve plate 12, so that the high pressure gas in the annulus 4 enters the buffer chamber 903 through the first side hole 8 and the connecting pipe 901, achieving initial pressure relief and preventing the suspension sleeve 2 from being lifted due to pressure buildup in the annulus 4. Then, the drive assembly reverses its action, causing the first sealing plug 1101 to block the first valve plate 11 and the second sealing plug 1201 to move away from the second valve plate 12. The high pressure gas in the buffer chamber 903 is quickly drawn in and discharged by the negative pressure of the negative pressure chamber 902, completing one pressure relief cycle. In this way, the intermittent pressure relief of the annulus 4 is achieved through the periodic action of the drive assembly, which not only avoids the problems of cement slurry backflow and side hole blockage caused by the traditional fully open side hole, but also solves the problems of pressure buildup and lifting of the suspension sleeve 2 caused by the fully closed side hole.

[0021] like Figures 1-4 As shown, in a preferred embodiment of the present invention, the first valve plate 11 and the second valve plate 12 have the same width, the first sealing plug 1101 and the second sealing plug 1201 have the same width, and the width of the first sealing plug 1101 is greater than the width of the vent hole on the first valve plate 11.

[0022] In practical application, when the drive assembly drives the first sealing plug 1101 away from the first valve plate 11, the second sealing plug 1201 has already been inserted into the vent hole on the second valve plate 12 and completed the sealing before the first sealing plug 1101 is completely removed from the vent hole on the first valve plate 11. When the drive assembly drives the first sealing plug 1101 to be inserted into the vent hole on the first valve plate 11, the second sealing plug 1201 has not yet completely detached from the vent hole on the second valve plate 12. This always avoids the simultaneous connection of the connecting pipe 901, the negative pressure chamber 902, and the buffer chamber 903, effectively preventing the negative pressure of the negative pressure chamber 902 from directly acting on the annulus 4, thereby avoiding the problem of false backflow of cement slurry due to negative pressure suction during cementing. This solves the cementing quality hazards caused by the crude sidehole control mode.

[0023] like Figures 1-6 As shown, in a preferred embodiment of the present invention, the driving assembly includes a fixed vertical plate 13, a sliding frame 15, a permanent magnet 17, an electromagnet 18, and a linkage assembly. The fixed vertical plate 13 is fixedly installed in the buffer cavity 903. A horizontal plate 14 is fixedly installed on the fixed vertical plate 13. A round rod 16 is slidably installed on the fixed vertical plate 13. The sliding frame 15 is slidably installed on the horizontal plate 14. One end of the sliding frame 15 is fixedly connected to the first sealing plug 1101, and the other end of the sliding frame 15 is fixedly connected to the round rod 16. The permanent magnet 17 is fixedly connected to the end of the round rod 16 away from the sliding frame 15. The electromagnet 18 is fixedly installed in the buffer cavity 903. The electromagnet 18 is fixedly installed in the buffer cavity 903 and is connected to the power supply via the wire 1801. The power supply is connected to the controller, and the sliding frame 15 is connected to the linkage component. The linkage component drives the second sealing plug 1201 to rise and fall. When the electromagnet 18 is energized, a repulsive force is generated between the electromagnet 18 and the permanent magnet 17, pushing the permanent magnet 17 to move away from the electromagnet 18. Simultaneously, the round rod 16 and the sliding frame 15 move towards the first valve plate 11, so that the first sealing plug 1101 blocks the first valve plate 11. At this time, the sliding frame 15 drives the second sealing plug 1201 away from the second valve plate 12 through the linkage component.

[0024] In one embodiment of this invention, it should be noted that the power supply and controller described in this invention are both prior art, and this invention does not improve them. Therefore, it is not necessary to disclose their specific mechanical and circuit structures, and this does not affect the integrity of this invention.

[0025] In practical application of this embodiment, during cementing operations, when the gas pressure inside the annulus 4 increases and acts on the first sealing plug 1101, the gas pressure pushes the first sealing plug 1101 away from the first valve plate 11. The first sealing plug 1101 drives the sliding frame 15 to slide along the horizontal plate 14. The sliding frame 15 simultaneously drives the round rod 16 and the permanent magnet 17 to move closer to the electromagnet 18. While the sliding frame 15 moves, it drives the second sealing plug 1201 to rise through the linkage component. When a gap appears between the first sealing plug 1101 and the first valve plate 11, the high-pressure gas inside the annulus 4 enters the buffer chamber 903 through the first side hole 8, the connecting pipe 901, and the vent on the first valve plate 11, achieving initial pressure relief and preventing pressure buildup in the annulus 4. When the buffer chamber 903 is filled with high-pressure gas, the controller controls the power supply to energize the electromagnet 18. The electromagnet 18 and the permanent magnet 17 generate a repulsive force, pushing the permanent magnet 17 away from the electromagnet 18, thereby driving the round rod 16 and the permanent magnet 17 to move closer to the electromagnet 18. The sliding frame 15 moves closer to the first valve plate 11, and the first sealing plug 1101 is inserted into the vent hole on the first valve plate 11 and completes the sealing, so that the connecting pipe 901 is disconnected from the buffer chamber 903. When the sliding frame 15 moves in the opposite direction, the second sealing plug 1201 is driven to descend through the linkage component, so that the second sealing plug 1201 moves away from the second valve plate 12, and the negative pressure chamber 902 is connected to the buffer chamber 903. Since the negative pressure chamber 902 is always in a negative pressure state, it can quickly draw in and discharge the high pressure gas in the buffer chamber 903, and complete a complete exhaust and pressure relief action. After the exhaust is completed, the buffer chamber 903 will also be in a negative pressure state. At this time, the controller controls the electromagnet 18 to be de-energized. When the repulsive force is lost, the negative pressure in the buffer chamber 903 and the high pressure in the annulus 4 will work together to quickly push the first sealing plug 1101 away from the first valve plate 11 again, thereby repeating the above process of introducing the high pressure gas in the annulus 4 into the buffer chamber 903. By controlling the electromagnet 18 to be intermittently energized by the controller, the alternating action of the first sealing plug 1101 and the second sealing plug 1201 can be realized, thereby achieving intermittent pressure relief of the annulus 4. This not only solves the problems of pressure buildup and lifting of the suspension sleeve 2 caused by the traditional fully closed side hole, but also avoids the problem of cement slurry backflow caused by the fully open side hole. At the same time, it realizes the automated control of the pressure relief process without manual operation.

[0026] like Figures 1-5 As shown, in a preferred embodiment of the present invention, a suction pipe 26 is fixedly installed inside the fixed cylinder 9. The suction pipe 26 is connected to the negative pressure chamber 902. A negative pressure channel 27 is opened inside the gas wellhead 1. One end of the negative pressure channel 27 is connected to the annular groove 6, and the other end of the negative pressure channel 27 is connected to the suction pipe 26.

[0027] In practical application, after the air extraction assembly is started, a stable negative pressure is formed in the negative pressure chamber 902. The negative pressure in the negative pressure chamber 902 is transmitted to the negative pressure channel 27 through the air extraction pipe 26, and then acts on the annular groove 6 on the bearing shoulder 5. Since the suspension sleeve 2 sits on the bearing shoulder 5 and blocks the annular groove 6, the negative pressure in the annular groove 6 will generate a downward suction force, which acts on the bottom of the suspension sleeve 2. This suction force can effectively counteract the upward buoyancy of the cement slurry on the collection pipe 3 and the suspension sleeve 2 during cementing return, and prevent the suspension sleeve 2 from being lifted and displaced. At the same time, with the real-time monitoring of the displacement sensor 7, the sitting stability of the suspension sleeve 2 is further improved, ensuring the reliability of the wellhead seal.

[0028] like Figures 5-6 As shown, in a preferred embodiment of the present invention, the drive assembly further includes a spring 19, which is sleeved on the outer circular surface of the round rod 16 with a gap between them. One end of the spring 19 is connected to the permanent magnet 17, and the other end of the spring 19 is connected to the fixed vertical plate 13. The preload of the spring 19 causes the permanent magnet 17 to approach the electromagnet 18, at which time the first sealing plug 1101 moves away from the first valve plate 11.

[0029] Specifically, an elastic damper 25 is fixedly installed on the fixed vertical plate 13. The movable end of the elastic damper 25 faces the sliding frame 15. When the electromagnet 18 is de-energized, the preload of the spring 19 pushes the permanent magnet 17 close to the electromagnet 18, and simultaneously drives the round rod 16 to move. The round rod 16 drives the sliding frame 15 to abut against the movable end of the elastic damper 25.

[0030] In practical application, when the electromagnet 18 is de-energized, the preload of the spring 19 actively pushes the permanent magnet 17 to move closer to the electromagnet 18. The permanent magnet 17 drives the round rod 16 and the sliding frame 15 to move synchronously, causing the first sealing plug 1101 to move away from the first valve plate 11. This eliminates the need to wait for the air pressure in the annulus 4 to rise before relying on air pressure to push the first sealing plug 1101 back to its original position, thus achieving active reset of the first sealing plug 1101. This improves the pressure relief response speed, and the preload of the spring 19 ensures that the distance between the first sealing plug 1101 and the first valve plate 11 remains consistent. The larger gap allows for a greater gas flow rate through the vent on the first valve plate 11 per unit time, avoiding the problem of insufficient gas pressure pushing the first sealing plug 1101 and the first valve plate 11, resulting in low exhaust pressure relief efficiency. Specifically, when a tiny gap appears between the first sealing plug 1101 and the first valve plate 11, airflow can pass through. At this time, the pushing force of the gas pressure on the first sealing plug 1101 will decrease instantly, making it impossible to further widen the gap between the two. This causes the high-pressure gas in the annulus 4 to take longer to fill the buffer chamber 903, severely reducing the exhaust pressure relief efficiency. When the spring 19 drives the permanent magnet 17, the round rod 16 and the sliding frame 15 to reset, the sliding frame 15 will first abut against the movable end of the elastic damper 25. The elastic damper 25 can play a buffering role, preventing the sliding frame 15 from directly hitting the fixed vertical plate 13, protecting the sliding frame 15, the round rod 16 and other components, and extending the service life of the device.

[0031] like Figures 5-6 As shown, in a preferred embodiment of the present invention, the linkage assembly includes a fixed frame 20, a square slide rod 21, a transmission shaft 22, an inclined groove 23, and a vertical groove 24. The fixed frame 20 is fixedly installed in the buffer cavity 903 and is located below the second valve plate 12. The square slide rod 21 is slidably installed on the top of the fixed frame 20, and the top end of the square slide rod 21 is fixedly connected to the second sealing plug 1201. The transmission shaft 22 is fixedly installed on the square slide rod 21. The inclined groove 23 is opened on the sliding frame 15. The inclined groove 23 is inclined, and the horizontal height of the end of the inclined groove 23 near the first valve plate 11 is higher than the horizontal height of the end of the inclined groove 23 away from the first valve plate 11. The vertical groove 24 is opened on the fixed frame 20 and is vertically arranged. The transmission shaft 22 is slidably installed in the vertical groove 24 and also slidably installed in the inclined groove 23.

[0032] In practical application, when the sliding frame 15 moves laterally towards the first valve plate 11 under the drive of the drive assembly, the sliding frame 15 drives the inclined groove 23 to move synchronously. Under the inclined guide of the inclined groove 23, the transmission shaft 22 slides downward along the vertical groove 24. When the transmission shaft 22 slides downward, it drives the square slide rod 21 to slide downward along the fixed frame 20. The square slide rod 21 drives the second sealing plug 1201 to descend synchronously, so that the second sealing plug 1201 moves away from the second valve plate 12, realizing the connection between the negative pressure chamber 902 and the buffer chamber 903. When the sliding frame 15 moves away from the first valve plate 11... When the direction moves laterally, the inclined groove 23 moves synchronously in the opposite direction. Under the guidance of the inclined groove 23, the transmission shaft 22 slides upward along the vertical groove 24, driving the square slide rod 21 and the second sealing plug 1201 to rise synchronously, so that the second sealing plug 1201 is inserted into the vent hole on the second valve plate 12 and completes the sealing, realizing the disconnection and connection between the negative pressure chamber 902 and the buffer chamber 903. The square structure of the square slide rod 21 can play a limiting and guiding role, preventing the square slide rod 21 from deflecting during the lifting and lowering process, and ensuring that the second sealing plug 1201 can accurately slide and cooperate with the vent hole on the second valve plate 12.

[0033] like Figure 1As shown, in a preferred embodiment of the present invention, the pressure monitoring component includes a second side hole 28, a flange pipe 29, and a pressure sensor 30. The second side hole 28 is opened on the gas wellhead 1, and the second side hole 28 and the first side hole 8 are symmetrically arranged about the gas wellhead 1. The second side hole 28 is connected to the annulus 4. The flange pipe 29 is connected to the second side hole 28. The pressure sensor 30 is connected to the flange pipe 29, and the pressure sensor 30 and the flange pipe 29 are detachably connected. The pressure sensor 30 is connected to the controller.

[0034] In one embodiment of this invention, it should be noted that the air pressure sensor 30 described in this invention is prior art. This invention does not improve upon it. Therefore, it is not necessary to disclose its specific mechanical and circuit structures, and this does not affect the integrity of this invention.

[0035] In practical application, during cementing operations, cement slurry fills the annulus 4 from bottom to top. The air and drilling fluid in the upper part of the annulus 4 are continuously compressed. The pressure sensor 30 monitors the pressure changes in the annulus 4 in real time through the flange pipe 29 and the second side hole 28, and transmits the pressure signal to the controller. When the pressure in the annulus 4 exceeds the preset threshold, the drive component is immediately controlled to activate and start the pressure relief process. Since the pressure sensor 30 and the flange pipe 29 are detachably connected, the pressure sensor 30 can be quickly disassembled and replaced when it malfunctions or needs maintenance, without affecting the overall operation of the device. In addition, when problems such as insufficient cement slurry return or poor sealing of the annulus 4 occur during cementing operations, the pressure sensor 30 can be disassembled, and cement slurry can be added to the annulus 4 through the flange pipe 29 and the second side hole 28 to achieve subsequent maintenance operations. This solves the problem that the traditional side hole has a single function and cannot meet the needs of multiple working conditions, further improving the practicality of the device.

[0036] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A digital wellhead device for installation position sensing, characterized in that, include: A gas wellhead (1) is fixedly installed on the ground and connected to the gas well. A bearing shoulder (5) is provided on the inner wall of the gas wellhead (1). The diameter of the bearing shoulder (5) increases upward along the axis of the gas wellhead (1). A suspension sleeve (2) is provided inside the gas wellhead (1). The suspension sleeve (2) is placed on the bearing shoulder (5). An annular groove (6) is provided on the bearing shoulder (5). Multiple circumferentially arranged displacement sensors (7) are fixedly installed in the annular groove (6). The detection end of the displacement sensor (7) abuts against the suspension sleeve (2). A collection pipe (3) is fixedly installed at the bottom of the suspension sleeve (2). An annular space (4) is formed between the suspension sleeve (2) and the well wall of the gas well. A first side hole (8) is provided on the gas wellhead (1). The first side hole (8) is connected to the annular space (4). A fixed cylinder (9) is fixedly installed on the outer surface of the gas wellhead (1). The fixed cylinder (9) contains a negative pressure chamber (902) and a buffer chamber (903). The negative pressure chamber (902) and the buffer chamber (903) are connected. A connecting pipe (901) is provided at one end of the fixed cylinder (9) facing the gas wellhead (1), connecting to the buffer chamber (903). The connecting pipe (901) is connected to the first side hole (8). The end of the fixed cylinder (9) away from the gas wellhead (1) is connected to the gas extraction assembly via a gas extraction valve (10). The gas extraction valve (10) is connected to the negative pressure chamber (902), and the connecting pipe (901) is connected to the buffer chamber (903). A first valve plate (11) with a vent hole is fixedly installed at the connection point between the negative pressure chamber (902) and the buffer chamber (903). A second valve plate (12) with a vent hole is fixedly installed at the connection point between the negative pressure chamber (902) and the buffer chamber (903). A first sealing plug (1101) and a second sealing plug (1201) are slidably installed in the buffer chamber (903). The first sealing plug (1101) is slidably engaged with the vent hole of the first valve plate (11), and the second sealing plug (1201) is slidably engaged with the vent hole of the second valve plate (12). Both the first sealing plug (1101) and the second sealing plug (1201) are driven to move by a drive assembly. When the drive assembly drives the first sealing plug (1101)... When the first valve plate (11) is blocked by inserting into the vent hole, the connecting pipe (901) is disconnected from the buffer chamber (903), and the second sealing plug (1201) moves away from the second valve plate (12), so that the negative pressure chamber (902) is connected to the buffer chamber (903). When the drive assembly drives the first sealing plug (1101) away from the first valve plate (11), the connecting pipe (901) is connected to the buffer chamber (903), and the second sealing plug (1201) is inserted into the vent hole of the second valve plate (12) to block the second valve plate (12), so that the negative pressure chamber (902) is disconnected from the buffer chamber (903). The air pressure monitoring component is used to monitor the air pressure in the annulus (4). When the air pressure exceeds the threshold, the drive component drives the first sealing plug (1101) to block the first valve plate (11).

2. The digital wellhead device for installation position sensing according to claim 1, characterized in that, The first valve plate (11) and the second valve plate (12) have the same width, the first sealing plug (1101) and the second sealing plug (1201) have the same width, and the width of the first sealing plug (1101) is greater than the width of the vent hole on the first valve plate (11).

3. The digital wellhead device for installation position sensing according to claim 1, characterized in that, The driving assembly includes a fixed vertical plate (13), a sliding frame (15), a permanent magnet (17), an electromagnet (18), and a linkage assembly. The fixed vertical plate (13) is fixedly installed in the buffer cavity (903). A horizontal plate (14) is fixedly installed on the fixed vertical plate (13). A round rod (16) is slidably installed on the fixed vertical plate (13). The sliding frame (15) is slidably installed on the horizontal plate (14). One end of the sliding frame (15) is fixedly connected to the first sealing plug (1101), and the other end of the sliding frame (15) is fixedly connected to the round rod (16). The permanent magnet (17) is fixedly connected to the end of the round rod (16) away from the sliding frame (15). The electromagnet (18) is fixedly installed in the buffer cavity (903). Inside the cavity (903), the electromagnet (18) is connected to the power supply through the wire (1801), the power supply is connected to the controller, the sliding frame (15) is connected to the linkage component, and the linkage component drives the second sealing plug (1201) to rise and fall. When the electromagnet (18) is energized, the electromagnet (18) and the permanent magnet (17) generate a repulsive force, pushing the permanent magnet (17) to move away from the electromagnet (18), and simultaneously driving the round rod (16) and the sliding frame (15) to move towards the first valve plate (11), so that the first sealing plug (1101) blocks the first valve plate (11). At this time, the sliding frame (15) drives the second sealing plug (1201) away from the second valve plate (12) through the linkage component.

4. The digital wellhead device for installation position sensing according to claim 3, characterized in that, A suction pipe (26) is fixedly installed inside the fixed cylinder (9). The suction pipe (26) is connected to the negative pressure chamber (902). A negative pressure channel (27) is opened inside the gas wellhead (1). One end of the negative pressure channel (27) is connected to the annular groove (6), and the other end of the negative pressure channel (27) is connected to the suction pipe (26).

5. The digital wellhead device for installation position sensing according to claim 3, characterized in that, The drive assembly also includes a spring (19), which is sleeved on the outer surface of the round rod (16) with a gap between them. One end of the spring (19) is connected to the permanent magnet (17), and the other end of the spring (19) is connected to the fixed vertical plate (13). The preload of the spring (19) causes the permanent magnet (17) to move closer to the electromagnet (18), at which time the first sealing plug (1101) moves away from the first valve plate (11).

6. The digital wellhead device for installation position sensing according to claim 5, characterized in that, An elastic damper (25) is fixedly installed on the fixed vertical plate (13). The movable end of the elastic damper (25) faces the sliding frame (15). When the electromagnet (18) is de-energized, the preload of the spring (19) pushes the permanent magnet (17) close to the electromagnet (18), and simultaneously drives the round rod (16) to move. The round rod (16) drives the sliding frame (15) to abut against the movable end of the elastic damper (25).

7. The digital wellhead device for installation position sensing according to claim 3, characterized in that, The linkage assembly includes a fixed frame (20), a square slide rod (21), a drive shaft (22), an inclined groove (23), and a vertical groove (24). The fixed frame (20) is fixedly installed in the buffer cavity (903) and is located below the second valve plate (12). The square slide rod (21) is slidably installed on the top of the fixed frame (20). The top end of the square slide rod (21) is fixedly connected to the second sealing plug (1201). The drive shaft (22) is fixedly installed on the square slide rod. (21) The inclined groove (23) is opened on the sliding frame (15). The inclined groove (23) is arranged at an angle, and the horizontal height of the end of the inclined groove (23) near the first valve plate (11) is higher than the horizontal height of the end of the inclined groove (23) away from the first valve plate (11). The vertical groove (24) is opened on the fixed frame (20). The vertical groove (24) is arranged vertically. The transmission shaft (22) is slidably installed in the vertical groove (24) and the transmission shaft (22) is slidably installed in the inclined groove (23).

8. The digital wellhead device for installation position sensing according to claim 3, characterized in that, The gas pressure monitoring component includes a second side hole (28), a flange pipe (29), and a gas pressure sensor (30). The second side hole (28) is opened on the gas wellhead (1), and the second side hole (28) and the first side hole (8) are symmetrically arranged about the gas wellhead (1). The second side hole (28) is connected to the annulus (4). The flange pipe (29) is connected to the second side hole (28). The gas pressure sensor (30) is connected to the flange pipe (29), and the gas pressure sensor (30) and the flange pipe (29) are detachably connected. The gas pressure sensor (30) is connected to the controller.

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