An oil and gas pipeline network full-time intelligent management system and method

Abstract

The application discloses an oil and gas pipeline network full-time intelligent management system and method, which comprises optical fibers laid between a gas extraction well head and a gas gathering station or between the gas gathering stations or along long-distance pipelines, wherein the optical fibers are laid along the gathering and transportation pipelines; a control system is arranged in the gas gathering station, the optical fibers are connected with the control system, and the control system is used for closing an emergency cutting device arranged on the gathering and transportation pipeline according to alarm data collected by the optical fibers and performing valve repairing or replacing according to valve fault of the cutting pipeline. The application effectively combines optical fiber detection with electric emergency cutting devices of the gathering and transportation pipelines, timely returns data information of the gathering and transportation pipelines or well head data to the control system, analyzes the data by a database of the control system, feeds back the information to an intelligent management system, and operates an after-sales guarantee system to guarantee normal operation and maintenance of the whole system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy gathering and transportation safety protection, and particularly relates to an oil and gas pipeline network full-time intelligent management system and method. BACKGROUND

[0002] In recent years, with the gradual development of modernization and the improvement of economic level in China, the scale of oil and gas production is increasing, but the lack of reasonable safety management and emergency measures leads to frequent oil and gas disasters. Large construction projects exist in the vicinity of gathering and transportation pipelines, which may invade the gathering and transportation pipelines. Natural disasters such as landslides or earthquakes may cause the gathering and transportation pipelines to break or deform, which may lead to pipeline leakage. At present, most long-distance pipelines are manually inspected, and the protection means is backward. Pipeline leakage cannot be detected in time, and real-time monitoring cannot be realized. Most of the pipeline control valves are manually controlled, and the disaster cannot be shut off in time. The disaster location cannot be determined in time, which leads to a lag in accident control. The existing SCADA system in the oilfield is mainly used for data acquisition and monitoring control and process control, and lacks database analysis and intelligent management system, which cannot analyze and effectively utilize the collected data.

[0003] Natural gas production wellhead long-term production can cause serious corrosion of the valve, valve leakage, valve rod fracture and switch failure, steel ring seal failure of the four-way component, and leakage, exposure, buried depth change and geological deformation of the gas transmission pipeline, which seriously affect the normal production of the gas production wellhead and the gas transmission pipeline, and pose a certain safety hazard, greatly reducing the safety of subsequent operations. SUMMARY

[0004] The purpose of the present application is to provide an oil and gas pipeline network full-time intelligent management system and method to overcome the defects of the prior art. The present application effectively combines fiber detection with electric emergency shutdown devices of gathering and transportation pipelines, and timely returns the data information of the gathering and transportation pipelines or wellhead to the control system. The control system analyzes the data through the database, feeds back the information to the intelligent management system, and runs the after-sales guarantee system to ensure the normal operation and maintenance of the overall system.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] An oil and gas pipeline network full-time intelligent management system comprises optical fibers laid between a gas production wellhead and a gas gathering station or between gas gathering stations, or optical fibers laid along long-distance pipelines. The optical fibers are laid along the gathering and transportation pipelines. A control system is arranged in the gas gathering station. The optical fibers are connected to the control system. The control system is used to close the emergency shutdown device arranged on the gathering and transportation pipeline according to the alarm data collected by the optical fibers, and to repair or replace the valve according to the valve failure of the shutdown pipeline.

[0007] Further, the emergency cutting device comprises a valve body, a high-pressure end of the valve body is connected to an upstream pipeline of the gas transmission pipeline, a low-pressure end of the valve body is connected to a downstream pipeline of the gas transmission pipeline, a valve cover is connected to the valve body, a top cover is connected to the valve cover, an upper cover is connected to the top cover, a mounting base is connected to the upper cover, a motor is connected to the mounting base, a screw nut is inserted through a bearing on the upper cover, an output shaft of the motor is connected to a pinion through a first key, the pinion is engaged with a gear connected to the screw nut, the gear and the screw nut are connected through a key and fixed by a lock nut, a screw rod matched with the screw nut is inserted in the screw nut, the screw rod is connected to a sliding sleeve through an anti-rotation support at the bottom of the screw rod, a sliding block is arranged in the sliding sleeve, the sliding block is connected to a valve rod inserted in the sliding sleeve, the valve rod is connected to a closing valve element through the top cover at the lower part of the valve rod, the valve cover is connected to a valve seat arranged in the valve body through a hanging core at the lower part of the valve cover, the closing valve element is arranged inside the hanging core, a spring is arranged in the valve seat, a lock cap matched with the valve rod is arranged on the upper part of the closing valve element, a detection port is arranged in the sidewall of the valve cover, a high-pressure stop valve is connected to the detection port, and a pressure sensor is arranged between the detection port and the high-pressure stop valve.

[0008] Further, the motor is connected to the mounting base through an explosion-proof box, a handle nut is connected to the outside of the screw nut through a second key, a screw rod cap is connected to the top of the screw nut, the valve cover is connected to the valve body through a plurality of high-strength bolts, and a sealing gasket ring is arranged at the connection between the valve cover and the valve body, a protective cover capable of protecting the gear and the pinion is connected to the mounting base, a first sealing ring is arranged at the position where the valve rod passes through the top cover, a second sealing ring is arranged at the connection between the top cover and the valve cover, a third sealing ring is arranged at the connection between the valve seat and the valve body, a fourth sealing ring matched with the valve seat is arranged on the closing valve element, and a fifth sealing ring matched with the closing valve element is arranged at the lower end of the valve rod.

[0009] Further, when the valve is repaired, a pressurized valve repair tool is used, the pressurized valve repair tool comprises a valve connected to a wellhead large four-way flange, a blowout preventer flange B is connected to the upper part of the valve, a hydraulic cylinder short section is connected to a hydraulic cylinder through the upper part of the blowout preventer flange B, a plug rod is inserted in the hydraulic cylinder, and the upper part of the plug rod extends out of the hydraulic cylinder, the plug rod comprises a plug, a piston rod is connected to the upper part of the plug, a center rod is inserted in the center hole of the plug and the center hole of the piston rod, the free end of the center rod extends out of the end of the piston rod, and the end of the piston rod is fixed to the center rod through a fixing nut and a center rod pressure cap;

[0010] The plug comprises a sleeve connected to the piston rod, the free end of the sleeve is connected to a sealing glue barrel, the free end of the sealing glue barrel is fixed by a plug, and the lower end of the center rod is threadedly connected to the plug;

[0011] The righting crossbeam is connected to the blowout preventer flange B or the hydraulic cylinder, the piston rod on the upper part of the plug rod is connected to the non-dropping crossbeam, the two ends of the righting crossbeam and the non-dropping crossbeam are connected through the first vertical column and the second vertical column respectively, the blowout preventer flange B is provided with a pressure gauge and a pressure relief valve, and the blowout preventer flange B is sealed through combined sealing.

[0012] Further, the upper part of the sleeve is connected with a plug connector rod, the upper part of the plug connector rod is connected with a plug upper connector, the upper part of the plug upper connector is connected to the piston rod through a movable connection assembly, the hollow of the plug upper part, the hollow of the plug upper connector, the hollow of the movable connection assembly and the hollow of the piston rod are inserted with a center rod, the plug connector rod is internally provided with a shaft sleeve, the lower part of the plug connector rod is connected to the sleeve, the free end of the sleeve is connected to a sealing rubber tube, the free end of the sealing rubber tube is fixed through a plug, the upper end of the shaft sleeve is connected with the center rod, the lower end is connected with a center shaft, the free end of the center shaft is inserted into the hollow of the sleeve, the sealing rubber tube and the plug, and the plug is threadedly connected with the center shaft;

[0013] The inside of the plug connector rod is a light hole, the outside of the shaft sleeve is a light rod, and the shaft sleeve and the plug connector rod are gap fitted;

[0014] The movable joint assembly comprises a movable joint connector connected with the plug upper connector, the movable joint connector is connected to a movable joint through a pressure cap, a movable joint snap ring is arranged between the movable joint connector and the pressure cap, and the movable joint is connected with the piston rod;

[0015] A first sealing element is arranged between the plug connector rod and the sleeve, and a second sealing element is arranged between the sleeve and the center shaft;

[0016] The piston rod and the center rod are gap fitted;

[0017] The first vertical column, the righting crossbeam and the non-dropping crossbeam, and the second vertical column, the righting crossbeam and the non-dropping crossbeam are all fixed through limiting nuts.

[0018] Further, when the valve is replaced, according to the actual situation, the valve is directly replaced by using a valve replacement tool under pressure, or a new operation channel is established by using a pressure drilling tool under pressure, and then a valve replacement tool under pressure is used to replace the faulty valve;

[0019] The tool comprises a stand column assembly connected to the wellhead big four-way flange, an upper part of the stand column assembly is connected with a plug rod through a centralizing beam, the plug rod is inserted into a hydraulic cylinder assembly, the plug rod comprises a plug, an upper part of the plug is connected to a movable connection assembly through a plug upper joint, an upper part of the movable connection assembly is connected with a piston rod, a hollow of the plug upper part, a center hole of the plug upper joint, a center hole of the movable connection assembly and a center hole of the piston rod are inserted with a center rod, a free end of the center rod is inserted into an end of the piston rod, the end of the piston rod is fixed to the center rod through a fixing nut and a center rod pressure cap;

[0020] The plug comprises a plug connecting rod connected to the plug upper joint, an inner part of the plug connecting rod is installed with a shaft sleeve, a lower part of the plug connecting rod is connected with a sleeve, a free end of the sleeve is connected to a sealing rubber tube, the free end of the sealing rubber tube is fixed through a plug head, an upper end of the shaft sleeve is connected to the center rod, a lower end of the shaft sleeve is connected with a center shaft, a free end of the center shaft is inserted into center holes of the sleeve, the sealing rubber tube and the plug head, and the plug head is threadedly connected to the center shaft;

[0021] The hydraulic cylinder assembly comprises a hydraulic cylinder, a lower part of the hydraulic cylinder is connected to a blowout preventer flange B through a hydraulic cylinder short section, the blowout preventer flange B is connected to the wellhead big four-way flange through a valve, a lower part of the plug rod is inserted into the wellhead big four-way flange, an upper part of the plug rod is inserted into the hydraulic cylinder and connected to the centralizing beam through a groove outside the piston rod; the blowout preventer flange B is provided with a pressure relief valve and a pressure gauge, and the blowout preventer flange B is sealed through combined sealing.

[0022] Further, an inner part of the plug connecting rod is a light hole, an outer part of the shaft sleeve is a light rod, and the shaft sleeve and the plug connecting rod are gap fitted; the piston rod and the center rod are gap fitted; the stand column assembly comprises two stand columns, bottom parts of the two stand columns are connected to the wellhead big four-way flange through stand column joints, upper parts of the two stand columns are connected to the centralizing beam; the movable joint assembly comprises a movable joint connector connected to the plug upper joint, the movable joint connector is connected to a movable joint through a pressure cap, a movable joint snap ring is arranged between the movable joint connector and the pressure cap, and the movable joint is connected to the piston rod; a first sealing element is arranged between the plug connecting rod and the sleeve, and a second sealing element is arranged between the sleeve and the center shaft.

[0023] Further, the tool comprises a blowout preventer flange A fixed to a standby control valve of a valve to be operated, a center drill rod is inserted into the blowout preventer flange A, and V-shaped seals for sealing the center drill rod are arranged on upper and lower sides of the blowout preventer flange A, a bottom part of the center drill rod is connected to a drill bit through a centralizing sleeve, and a top part of the center drill rod is connected with a drill rod extension rod;

[0024] The lower centering crossbeam is connected with the blowout preventer flange A upper part, the middle part of the lower centering crossbeam is inserted into the center drill rod, both ends are inserted into the stand A, the bottom of the stand A is fixed on the fixed seat of the valve to be drilled, the center drill rod is connected with the non-loose crossbeam A, the non-loose crossbeam A is located on the upper side of the lower centering crossbeam, and the middle part of the non-loose crossbeam A is inserted into the center drill rod, both ends are inserted into the stand A, and the top of the stand A is connected with the stand A lengthening rod;

[0025] The top of the stand A lengthening rod is connected with the motor crossbeam, both ends of the motor crossbeam are fixed with the hydraulic cylinder A, the middle part is connected with the motor support, the motor support is provided with the hydraulic motor, the center of the motor support is provided with the connecting spline and the drill rod conversion shaft, the output shaft of the hydraulic motor is connected to the drill rod conversion shaft through the connecting spline, the lower part of the drill rod conversion shaft is inserted into the center of the motor crossbeam, and the bottom of the drill rod conversion shaft is connected with the top of the drill rod lengthening rod;

[0026] The hydraulic cylinder A and the hydraulic motor are controlled through the hydraulic control console.

[0027] Further, the blowout preventer flange A is provided with two sealing grooves for installing V-shaped seals in the center, V-shaped seal ring assemblies, V-shaped compression nuts and sealing packing rings are sequentially arranged from top to bottom in the upper sealing groove, and V-shaped seal ring assemblies, V-shaped compression nuts and sealing packing rings are sequentially arranged from top to bottom in the lower sealing groove;

[0028] The blowout preventer flange A is fixed on the standby control valve of the valve to be operated through eight double-end column bolts and matched nuts, the connecting surface is sealed through an octagonal gasket, the blowout preventer flange A is provided with sensors for measuring medium pressure or temperature parameters and a gas discharge valve for discharging medium during operation;

[0029] The lower centering crossbeam is composed of two male and female crossbeams, the male and female crossbeams are connected through double-end bolts, the lower centering crossbeam has three through holes, the middle through hole is matched in size with the center drill rod for passing through the center drill rod, and the left and right end through holes are used for installing the left and right stands A, the lower centering crossbeam is used for centering the blowout preventer flange A and preventing the blowout preventer flange A from rotating;

[0030] The lower centering crossbeam and the non-loose crossbeam A are connected with the stand A through the stand A limiting nut; a bearing is installed between the motor crossbeam and the drill rod conversion shaft, the motor support is threadedly connected with the motor crossbeam, and the motor support is connected with the hydraulic motor through bolts;

[0031] The motor crossbeam is provided with a cooling water injection inlet which is in communication with the center of the drill rod lengthening rod and the center drill rod;

[0032] The drill rod lengthening rod is threadedly connected on the drill rod conversion shaft, the center drill rod is threadedly connected with the drill rod lengthening rod, the centering sleeve is threadedly connected with the center drill rod, and the drill bit is threadedly connected with the centering sleeve.

[0033] The center drill rod and drill rod extension rod are provided with a plurality of positioning grooves, one of which is used for installing the non-loose beam A, and the rest are used for installing the drill rod protector ring;

[0034] The hydraulic cylinder A is connected with a hydraulic cylinder A beam at the top.

[0035] An oil and gas pipeline network full-time intelligent management method, through optical fiber monitoring of the gathering pipeline, when an abnormal situation is detected, alarm data is transmitted to the control system, the control system closes the emergency shut-off device arranged at both ends of the fault point of the gathering pipeline according to the alarm data collected by the optical fiber, and carries out valve repair or replacement according to the valve fault of the shut-off pipeline, if the leakage is caused by the master valve of the wellhead gas production tree, a pressure valve replacement tool is used to replace the fault valve under pressure; if the fault master valve cannot be opened and closed, a pressure drilling tool is used to establish a new operation channel, and then a pressure valve replacement tool is used to replace the fault valve; if the leakage occurs at the sealing steel ring of the wellhead gas production tree component, the gathering pipeline is caused to fail due to third party invasion or leakage, and a valve repair tool is used for pressure plugging repair.

[0036] Compared with the prior art, the present application has the following beneficial technical effects:

[0037] The present application effectively combines optical fiber detection with electric emergency shut-off device of the gathering pipeline, and timely returns the gathering pipeline data information or wellhead data to the control system, the control system analyzes the data through the database, feeds back the information to the intelligent management system, and runs the after-sales guarantee system to guarantee the normal operation and maintenance of the overall system.

[0038] Further, when the pipeline needs to be shut off, the control system gives a command to the motor, the motor rotates to drive the pinion gear, the gear, the screw nut to rotate, the screw moves downward to push the valve rod and the closing valve core to move downward to the valve seat, the closing valve core and the valve seat are sealed, and the pipeline is shut off; when the pressure sensor detects that the pipeline pressure exceeds or is lower than the set value, the control system will automatically give a command to the motor to execute the valve closing action. When the upstream pipeline suddenly increases in pressure or the downstream pipeline suddenly loses pressure, the motor does not need to act, the sliding block moves downward in the sliding sleeve to drive the valve rod and the closing valve core to move downward to the valve, the closing valve core and the valve seat are sealed, and the pipeline is shut off. In this process, the key is that a certain free stroke is left between the sliding block and the sliding sleeve when the pipeline normally transmits gas, the valve rod and the closing valve core are in a suspended static equilibrium state under the action of gas pressure, and when the pipeline pressure fluctuates greatly, the sliding block can drive the valve rod and the closing valve core to move downward to the valve seat. The present application not only can be remotely controlled to open and close under the condition of electrification, but also can automatically shut off when the pipeline pressure exceeds the set value or the upstream pipeline suddenly increases in pressure or the downstream pipeline suddenly loses pressure, so as to achieve the purpose of protecting the natural gas transmission pipeline.

[0039] In addition, when the pipeline needs to be opened to restore the cutting device, the control system gives a command to the motor, the motor rotates to drive the pinion, the gear, the screw nut to rotate, the screw moves upward, pulls the valve rod, and the closing valve core moves upward to a certain distance away from the valve seat, the seal on the closing valve core is separated from the valve seat, and the pipeline gas flow channel is opened. In this process, the focus is on the use of two-stage lifting when lifting the closing valve core. When the motor pulls the valve rod upward, the seal between the valve rod and the closing valve core is first pulled apart, allowing the upstream and downstream gas flows to open a small channel. After the pipeline pressure is balanced for a period of time, the closing valve core is lifted again, and the seal between the closing valve core and the valve seat is separated. This process greatly reduces the power consumption of the motor, and a small voltage and low power can make the seal ring at the lower end of the valve rod separate from the closing valve core, first forming a small gas flow channel, and then easily lifting the closing valve core to form a large gas flow channel.

[0040] Further, the valve repairing tool is connected with the hydraulic cylinder through the blowout prevention flange, which reduces the on-site disassembly and assembly operation, and the blowout prevention flange, the hydraulic cylinder short section and the hydraulic cylinder are fixed through threaded connection, so that the overall stability and reliability of the tool are increased. The righting cross beam is fixed on the hydraulic cylinder or the blowout prevention flange through the limiting clamping groove, and the righting cross beam is fixed without being lost through the limiting nut and the stand, so that the stand is not easy to swing during the working process, the working process is simple and safe, the hydraulic cylinder, the blowout prevention flange and the plugging rod are integrally connected, the process of the plugging rod moving to the plugging position is simple, fast and accurate, the plugging rod is flexible in extension and retraction operation, the valve repairing construction period is short, the influence on production capacity is small, and the valve repairing is safer, more reliable and faster.

[0041] In use, the hydraulic station is controlled through the hydraulic control console to inject oil into the upper cavity of the hydraulic cylinder, so that the piston rod with the plugging device moves downward to the specified position, and the piston rod is pressed tightly through the fixing nut on the piston rod, and then the center rod pressure cap is loosened, the center rod moves upward, the plugging device is sealed, the center rod is pulled upward to give the sealing rubber tube secondary pressure, the sealing rubber tube is extruded, the plugging is safer and more reliable, then the pressure gauge value on the blowout prevention flange is observed to be stable, the blowout prevention flange is opened, the medium in the cavity of the plugging device is discharged, the blowout prevention flange is closed, and the plugging is completed; in the plugging state, the faulty valve is disassembled, the damaged parts of the valve are repaired, the valve is restored after the valve maintenance is completed; the non-lost hand cross beam is removed, the center rod is operated, the center rod moves upward, the plugging part is unsealed, then the lower cavity of the hydraulic cylinder is injected with oil through the hydraulic station until the oil cylinder moves upward to the top end of the hydraulic cylinder and stops, the plugging device can quickly enter the specified position through the operation of the hydraulic station, the on-site personnel operation is simple, the plugging device is operated, the sealing is reliable, the operation time is shortened, the damaged valve is repaired as needed, and the working efficiency and safety are obviously improved.

[0042] Further, the valve changing tool utilizes the hydraulic cylinder and the column assembly to effectively combine the piston rod and the righting beam, and the center rod pressing cap can control the center rod to prevent the plug part from expanding when entering the pre-plugging position, and the piston rod part is effectively combined through the shaft sleeve, the protective sleeve, the center shaft, the plug connecting rod, the sealing rubber tube and the center rod pressing cap, and there is a gap design between the shaft sleeve and the plug connecting rod; after the center rod pressing cap is loosened, the sealing rubber tube can be extruded by the wellhead natural gas pressure when the plug is subjected to the medium pressure; after the extrusion and deformation of the sealing rubber tube by the natural gas pressure is stable, the center rod can be operated to control the shaft sleeve to drive the center shaft to extrude the sealing rubber tube again, thereby increasing the sealing reliability; the connection structure of the center rod, the center shaft and the shaft sleeve can make the sealing rubber tube expand or shrink as required by operating the center rod to control the shaft sleeve to drive the center shaft, and the structure is convenient and stable to operate; the connection of the center rod and the shaft sleeve enables the center rod to be freely disconnected without affecting the sealing effect of the plug, thereby facilitating the disassembly of the valve to be replaced and the installation of the new valve.

[0043] The movable joint assembly comprises a movable joint, a movable joint connector and a movable joint snap ring, and is connected with the piston rod, so that the plug is convenient to disassemble and assemble during use, and the disassembly and assembly are simple and reliable; the blowout prevention flange is provided with a gas release valve and a pressure gauge, and a combined sealing type is adopted for the sealing structure; the sealing effect is achieved through the compression combined sealing of the packing, and the sealing type is reliable and the sealing element is convenient to replace.

[0044] Further, the drilling tool adopts the blowout prevention flange to cooperate with the V-shaped sealing to conveniently and reliably seal the center drill rod, the invention adopts the non-loose beam to facilitate the disassembly and assembly of the center drill rod under pressure during the drilling process, so that the operation process is simple and safe, the invention adopts the double hydraulic cylinder structure to simultaneously control the up and down movement of the center drill rod, and the working process is more stable and reliable. The structure of the double hydraulic cylinder is beneficial to lengthening the center drill rod, so that the length of the center drill rod can be increased to a relatively long size, the invention adopts the drill rod righting sleeve to right the drill rod during the drilling process, thereby reducing the friction resistance in the drilling process, the drill rod and the drill rod lengthening rod adopted by the invention are both provided with a limiting groove, which facilitates the control of the center drill rod, the connection of the drill rod or the disassembly of the drill rod during the drilling process, the drilling construction period is short, the influence on the production capacity is small, and the drilling is more safe, reliable, fast, economical.

[0045] The sealing packing is used to conveniently replace the V-shaped sealing ring assembly; the center holes of the center drill rod and the drill rod lengthening rod can cool the drill bit and lubricate during the drilling process. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of the oil and gas pipeline network full-time intelligent management system of the invention;

[0047] Figure 2 It is a structural schematic diagram of the emergency shutdown device of the invention;

[0048] Figure 3 Structure diagram of the tool for repairing valve under pressure according to the present application;

[0049] Figure 4 Structure diagram of the tool for repairing valve under pressure according to the present application;

[0050] Figure 5 Structure diagram of the plug rod of the tool for repairing valve under pressure according to the present application;

[0051] Figure 6 Structure diagram of the movable connecting assembly of the tool for repairing valve under pressure according to the present application;

[0052] Figure 7 Structure diagram of the plug of the tool for repairing valve under pressure according to the present application;

[0053] Figure 8 Structure diagram of the tool for replacing valve under pressure according to the present application;

[0054] Figure 9 Structure diagram of the tool for drilling under pressure according to the present application.

[0055] 1, Christmas tree; 2, emergency shut-off device; 3, optical fiber; 4, gathering pipeline; 5, gas gathering station;

[0056] 1-1, motor; 1-2, explosion-proof box; 1-3, mounting bottom plate; 1-4, shroud; 1-5, pinion; 1-6, first key; 1-7, gear; 1-8, locking nut; 1-9, handle nut; 1-10, lead screw cap; 1-11, lead screw; 1-12, lead screw nut; 1-13, second key; 1-14, bearing; 1-15, upper cover; 1-16, anti-rotation bracket; 1-17, sliding sleeve; 1-18, sliding block; 1-19, pressure sensor; 1-20, high-pressure stop valve; 1-21, first sealing ring; 1-22, top cover; 1-23, second sealing ring; 1-24, valve stem; 1-25, valve cover; 1-26, third sealing ring; 1-27, valve body; 1-28, valve seat; 1-29, spring; 1-30, sealing gasket ring; 1-31, suspension core; 1-32, high-strength bolt; 1-33, fourth sealing ring; 1-34, closed valve core; 1-35, locking cap; 1-36, fifth sealing ring;

[0057] 2-1. Four-way cross; 2-2. Bushing; 2-3. Plug; 2-4. Seal gland; 2-5. First upright column; 2-6. Center rod; 2-7. Blowout preventer flange B; 2-8. Centralizing crossbeam; 2-9. Limiting nut; 2-10. Second upright column; 2-11. Non-slipping crossbeam; 2-12. Hydraulic cylinder; 2-13. Packer connecting rod; 2-14. Shaft sleeve; 2-15. Center shaft; 2-16. First seal; 2-17. Second seal; 2-18. Packer upper connector; 2-19. Movable connector; 2-20. Movable connector connecting head; 2-21. Movable connector snap ring; 2-22. Pressing cap; 2-23. Piston rod; 2-24. Fixing nut; 2-25. Center rod pressing cap; 2-26. No. 4 valve; 2-27. No. 1 master control valve;

[0058] 3-20. Upright column; 3-21. Hydraulic cylinder short section; 3-22. Upright column connector;

[0059] 4-1. Upright column fixing nut; 4-2. Upright column A; 4-3. Drill bit; 4-4. Centralizing sleeve; 4-5. Reducer connector; 4-6. Center drill rod; 4-7. V-shaped pressing nut; 4-8. V-shaped sealing ring assembly; 4-9. Sealing packing; 4-10. Upright column extension rod; 4-11. Non-slipping crossbeam A; 4-12. Drill rod extension rod; 4-13. Motor crossbeam; 4-14. Motor support; 4-15. Hydraulic motor; 4-16. Hydraulic cylinder A; 4-17. Connecting spline; 4-18. Drill rod conversion shaft; 4-19. Bearing; 4-20. Drill rod protection ring; 4-21. Upright column limiting nut; 4-22. Lower centralizing crossbeam; 4-23. Blowout preventer flange A; 4-24. Hydraulic cylinder crossbeam; 4-25. Cooling water injection inlet. DETAILED DESCRIPTION

[0060] The application will be described in further detail below with reference to the drawings and specific embodiments:

[0061] Referring to Figure 1 An oil and gas pipeline network full-time intelligent management system, comprising an optical fiber 3 laid between a gas production wellhead (a gas production tree 1 of the wellhead) and a gas gathering station 5, or between gas gathering stations, or along a long-distance pipeline, the optical fiber being laid along a gathering and transportation pipeline 4; a control system is arranged in the gas gathering station, the optical fiber is connected with the control system, and the control system is used for closing emergency shut-off devices 2 arranged on the gathering and transportation pipeline according to alarm data collected by the optical fiber, and performing valve repair or replacement according to valve failure of the shut-off pipeline, wherein the emergency shut-off devices 2 are distributed on the gathering and transportation pipeline 4.

[0062] Referring to Figure 2The emergency cut-off device comprises a valve body 1-27, a high-pressure end of the valve body 1-27 is connected to an upstream pipeline of a gas transmission pipeline, a low-pressure end of the valve body 1-27 is connected to a downstream pipeline of the gas transmission pipeline, a valve cover 1-25 is connected to the valve body 1-27, a top cover 1-22 is connected to the valve cover 1-25, an upper cover 1-15 is connected to the top cover 1-22, a mounting base plate 1-3 is connected to the upper cover 1-15, a motor 1-1 is connected to the mounting base plate 1-3, a screw nut 1-12 is inserted through a bearing 1-14 and arranged on the upper cover 1-15, an output shaft of the motor 1-1 is connected with a pinion 1-5 through a first key 1-6, the pinion 1-5 is engaged with a large gear 1-7 connected to the screw nut 1-12, the large gear 1-7 and the screw nut 1-12 are connected through a key and fixed by a lock nut 1-8, a screw rod 1-11 matched with the screw nut 1-12 is inserted into the screw nut 1-12, the screw rod 1-11 is connected to a sliding sleeve 1-17 through an anti-rotation support 1-16 at the bottom, a sliding block 1-18 is arranged in the sliding sleeve 1-17, a valve rod 1-24 is connected to the sliding block 1-18, the valve rod 1-24 is connected to a closing valve core 1-34 through the top cover 1-22, the top cover 1-22 is connected to a valve seat 1-28 arranged in the valve body 1-27 through a hanging core 1-31, the closing valve core 1-34 is arranged inside the hanging core 1-31, a spring 1-29 is arranged in the valve seat 1-28, a locking cap 1-35 matched with the valve rod 1-24 is arranged on the closing valve core 1-34, a detection port is arranged on the side wall of the top cover 1-22, a high-pressure cut-off valve 1-20 is connected to the detection port, and a pressure sensor 1-19 is arranged between the detection port and the high-pressure cut-off valve 1-20.

[0063] The motor 1-1 is connected to the mounting base plate 1-3 through an explosion-proof box 1-2; a handle nut 1-9 is connected to the outside of the screw nut 1-12 through a second key 1-13; a screw rod cover 1-10 is connected to the top of the screw nut 1-12; the valve cover 1-25 is connected to the valve body 1-27 through a plurality of high-strength bolts 1-32, and a sealing gasket ring 1-30 is arranged at the connection position of the valve cover 1-25 and the valve body 1-27; a protective cover 1-4 is connected to the mounting base plate 1-3, which can protect the large gear 1-7 and the pinion 1-5; a first sealing ring 1-21 is arranged at the position where the valve rod 1-24 passes through the top cover 1-22, a second sealing ring 1-23 is arranged at the connection position of the top cover 1-22 and the valve cover 1-25, a third sealing ring 1-26 is arranged at the connection position of the valve seat 1-28 and the valve body 1-27, a fourth sealing ring 1-33 matched with the valve seat 1-28 is arranged on the closing valve core 1-34, and a fifth sealing ring 1-36 matched with the closing valve core 1-34 is arranged at the lower end of the valve rod 1-24.

[0064] When the valve is repaired, a pressure repair tool is used, as shown in Figures 3 to 7, the valve tool includes a valve connected to the large four-way flange at the wellhead, a blowout preventer flange B2-7 connected to the upper part of the valve, a hydraulic cylinder short section connected to the hydraulic cylinder 2-12 through the upper part of the blowout preventer flange B2-7, a plug rod inserted in the hydraulic cylinder 2-12, and the upper part of the plug rod extending out of the hydraulic cylinder 2-12, the plug rod including a plug, a piston rod 2-23 connected to the upper part of the plug, and a center rod 2-6 inserted in the center hole of the plug and the center hole of the piston rod 2-23, the free end of the center rod 2-6 extending out of the end of the piston rod 2-23, and the end of the piston rod 2-23 being fixed to the center rod 2-6 through a fixed nut 2-24 and a center rod pressure cap 2-25;

[0065] The plug includes a sleeve 2-2 connected to the piston rod 2-23, the free end of the sleeve 2-2 being connected to a sealant cartridge 2-4, the free end of the sealant cartridge 2-4 being fixed through a plug 2-3, and the lower end of the center rod 2-2 being threadedly connected to the plug 2-3;

[0066] A centralizing cross beam 2-8 is connected to the blowout preventer flange B2-7 or the hydraulic cylinder 2-12, and a non-dropping cross beam 2-11 is connected to the piston rod 2-23 at the upper part of the plug rod, the two ends of the centralizing cross beam 2-8 and the non-dropping cross beam 2-11 being connected through a first vertical column 2-5 and a second vertical column 2-10 respectively, a pressure gauge and a pressure relief valve being arranged on the blowout preventer flange B2-7, and the blowout preventer flange B being sealed through combined sealing.

[0067] The upper part of the sleeve 2-2 is connected to a plug connector rod 2-13, the upper part of the plug connector rod 2-13 is connected to a plug upper connector 2-18, the upper part of the plug upper connector 2-18 is connected to the piston rod 2-23 through a movable connection assembly, the hollow of the upper part of the plug, the hollow of the plug upper connector 2-18, the hollow of the movable connection assembly, and the hollow of the piston rod 2-23 are inserted with the center rod 2-6, an axle sleeve 2-14 is installed in the plug connector rod 2-13, the lower part of the plug connector rod 2-13 is connected to the sleeve 2-2, the free end of the sleeve 2-2 is connected to the sealant cartridge 2-4, the free end of the sealant cartridge 2-4 is fixed through the plug 2-3, the upper end of the axle sleeve 2-14 is connected to the center rod 2-6, the lower end is connected to a center shaft 2-15, the free end of the center shaft 2-15 is inserted in the hollow of the sleeve 2-2, the sealant cartridge 2-4, and the plug 2-3, and the plug 2-3 is threadedly connected to the center shaft 2-15;

[0068] The inside of the plug connector rod 2-13 is a light hole, the outside of the axle sleeve 2-14 is a light rod, and the axle sleeve 2-14 is gap-fitted with the plug connector rod 2-13;

[0069] The movable joint assembly comprises a movable joint connecting head 2-20 connected with the upper joint of the plug 2-18, the movable joint connecting head 2-20 is connected to a movable joint 2-19 through a pressure cap 2-22, a movable joint ring 2-21 is arranged between the movable joint connecting head 2-20 and the pressure cap 2-22, and the movable joint 2-19 is connected with a piston rod 2-23;

[0070] A first sealing element 2-16 is arranged between the plug connecting rod 2-13 and the sleeve 2-2, and a second sealing element 2-17 is arranged between the sleeve 2-2 and the central shaft 2-15;

[0071] The piston rod 2-23 and the central rod 2-6 are in clearance fit;

[0072] The first upright column 2-5 and the central rod 2-6 are fixed through the limiting nut 2-9 between the central rod 2-6 and the central rod 2-6.

[0073] Referring to Figures 5 to 8 The pressure-changing valve tool comprises a column assembly connected to the flange of the large four-way joint at the well mouth, the upper part of the column assembly is connected with a plug rod through the centralizing beam 2-8, the plug rod is inserted into the hydraulic cylinder assembly, the plug rod comprises a plug, the upper part of the plug is connected to the movable joint assembly through the upper joint of the plug 2-18, the upper part of the movable joint assembly is connected with the piston rod 2-23, the hollow of the upper part of the plug, the central hole of the upper joint of the plug 2-18, the central hole of the movable joint assembly and the central hole of the piston rod 2-23 are inserted with the central rod 2-6, the free end of the central rod 2-6 penetrates out of the end of the piston rod 2-23, and the end of the piston rod 2-23 is fixed to the central rod 2-6 through the fixing nut 2-24 and the central rod pressure cap 2-25;

[0074] The plug comprises a plug connecting rod 2-13 connected with the upper joint of the plug 2-18, the plug connecting rod 2-13 is internally provided with a shaft sleeve 2-14, the lower part of the plug connecting rod 2-13 is connected with a sleeve 2-2, the free end of the sleeve 2-2 is connected to a sealing rubber tube 2-4, the free end of the sealing rubber tube 2-4 is fixed through a plug 2-3, the upper end of the shaft sleeve 2-14 is connected with the central rod 2-6, the lower end is connected with a central shaft 2-15, the free end of the central shaft 2-15 is inserted into the central holes of the sleeve 2-2, the sealing rubber tube 2-4 and the plug 2-3, and the plug 2-3 is threadedly connected with the central shaft 2-15;

[0075] The hydraulic cylinder assembly comprises a hydraulic cylinder 2-12, the lower part of the hydraulic cylinder 2-12 is connected to a blowout preventer flange B through a hydraulic cylinder short section 3-21, the lower part of the blowout preventer flange B is connected to a wellhead large four-way flange through a valve, the lower part of the plug rod is inserted into the wellhead large four-way flange, the upper part of the plug rod is inserted into the hydraulic cylinder 2-12, and the outer side groove of the piston rod 2-23 is connected to the centralizing cross beam 2-8; the blowout preventer flange B is provided with a pressure relief valve and a pressure gauge, and the blowout preventer flange B is sealed by combined sealing.

[0076] The inside of the plug rod 2-13 is a light hole, the outside of the shaft sleeve 2-14 is a light rod, and the shaft sleeve 2-14 and the plug rod 2-13 are gap fit; the piston rod 2-23 and the center rod 2-6 are gap fit; the stand assembly comprises two stands 3-20, the bottom of the two stands 3-20 is connected to the wellhead large four-way flange through a stand joint 3-22, and the upper part of the two stands 3-20 is connected to the centralizing cross beam 2-8; the movable joint assembly comprises a movable joint connector 2-20 connected to the upper joint 2-18 of the plug, the movable joint connector 2-20 is connected to the movable joint 2-19 through a pressure cap 2-22, a movable joint snap ring 2-21 is arranged between the movable joint connector 2-20 and the pressure cap 2-22, and the movable joint 2-19 is connected to the piston rod 2-23; a first sealing element 2-16 is arranged between the plug rod 2-13 and the sleeve 2-2, and a second sealing element 2-17 is arranged between the sleeve 2-2 and the center shaft 2-15.

[0077] Referring to Figure 9 , the under pressure drilling tool comprises a blowout preventer flange A 4-23 fixed on a standby control valve of a valve to be operated, a center drill rod 4-6 is inserted in the center of the blowout preventer flange A 4-23, and V-shaped seals for sealing the center drill rod 4-6 are arranged on the upper and lower sides of the blowout preventer flange A 4-23, the bottom of the center drill rod 4-6 is connected to a drill bit 4-3 through a centralizing sleeve 4-4, and the top of the center drill rod 4-6 is connected to a drill rod extension rod 4-12.

[0078] The upper part of the blowout preventer flange A 4-23 is connected to a lower centralizing cross beam 4-22, the middle part of the lower centralizing cross beam 4-22 is inserted into the center drill rod 4-6, and both ends are inserted into a stand A 4-2, the bottom of the stand A 4-2 is fixed on a fixed seat of a valve to be drilled, a non-dropping cross beam A 4-11 is connected to the center drill rod 4-6, the non-dropping cross beam A 4-11 is located on the upper side of the lower centralizing cross beam 4-22, the middle part of the non-dropping cross beam A 4-11 is inserted into the center drill rod 4-6, and both ends are inserted into the stand A 4-2, the top of the stand A 4-2 is connected to a stand A extension rod 4-10.

[0079] The top of the column A lengthening rod 4-10 is connected with a motor crossbeam 4-13, the two ends of the motor crossbeam 4-13 are fixed with hydraulic cylinders A 4-16, the middle part is connected with a motor support 4-14, the motor support 4-14 is provided with a hydraulic motor 4-15, the center of the motor support 4-14 is provided with a connecting spline 4-17 and a drill rod conversion shaft 4-18, the output shaft of the hydraulic motor 4-15 is connected to the drill rod conversion shaft 4-18 through the connecting spline 4-17, the lower part of the drill rod conversion shaft 4-18 penetrates the center of the motor crossbeam 4-13, and the bottom of the drill rod conversion shaft 4-18 is connected with the top of the drill rod lengthening rod 4-12;

[0080] The hydraulic cylinder A 4-16 and the hydraulic motor 4-15 are controlled by a hydraulic control console.

[0081] The center of the blowout preventer flange A 4-23 is provided with two upper and lower sealing grooves for installing V-shaped seals, the upper sealing groove is sequentially provided from top to bottom with a V-shaped sealing ring assembly 4-8, a V-shaped compression nut 4-7 and a sealing packing 4-9, and the lower sealing groove is sequentially provided from top to bottom with a V-shaped sealing ring assembly 4-8, a V-shaped compression nut 4-7 and a sealing packing 4-9;

[0082] The blowout preventer flange A 4-23 is fixed on a standby control valve of a valve to be operated by eight double-end column bolts and matched nuts, the connection surface is sealed by an octagonal gasket, the blowout preventer flange A 4-23 is provided with sensors for measuring medium pressure or temperature parameters and a gas discharge valve for discharging medium during operation;

[0083] The lower centralizing crossbeam 4-22 is composed of two male and female crossbeams, the male and female crossbeams are connected by double-end bolts, the lower centralizing crossbeam 4-22 has three through holes, the middle through hole is matched in size with the center drill rod 4-6 for penetrating the center drill rod 4-6, and the left and right end through holes are used for installing the left and right columns A 4-2, the lower centralizing crossbeam 4-22 is used for centralizing the blowout preventer flange A 4-23 and preventing the blowout preventer flange A 4-23 from rotating;

[0084] The lower centralizing crossbeam 4-22 and the non-dropping crossbeam A 4-11 are connected with the column A 4-2 through the column A limiting nut 4-21, a bearing 4-19 is installed between the motor crossbeam 4-13 and the drill rod conversion shaft 4-18, the motor support 4-14 is threadedly connected with the motor crossbeam 4-13, and the motor support 4-14 is boltedly connected with the hydraulic motor 4-15;

[0085] The motor crossbeam 4-13 is provided with a cooling water injection inlet 4-25 which is in communication with the center of the drill rod lengthening rod 4-12 and the center drill rod 4-6;

[0086] The drill pipe extension rod 4-12 is connected to the drill pipe conversion shaft 4-18 by screwing, the central drill pipe 4-6 is connected to the drill pipe extension rod 4-12 by screwing, the centralizing sleeve 4-4 is connected to the central drill pipe 4-6 by screwing, and the drill bit 4-3 is connected to the centralizing sleeve 4-4 by screwing;

[0087] The central drill pipe 4-6 and the drill pipe extension rod 4-12 are both provided with a plurality of positioning grooves, one of which is used for installing the non-loose cross beam A4-11, and the rest of which are used for installing the drill pipe protection ring 4-20.

[0088] The top of the hydraulic cylinder A4-16 is connected with the hydraulic cylinder A cross beam 4-24.

[0089] An oil and gas pipeline network full-time intelligent management method, through optical fiber monitoring of the gathering pipeline, when detecting abnormal conditions (such as third party intrusion, geological disasters or pipeline leakage, etc.), alarm data is transmitted to the control system, the control system closes the emergency shut-off device arranged at both ends of the fault point of the gathering pipeline according to the alarm data collected by the optical fiber, and performs valve repair or replacement according to the valve fault of the shut-off pipeline; if it is caused by leakage of the wellhead Christmas tree master control valve, a pressure valve replacement tool is used to replace the faulty valve under pressure; if the faulty master control valve cannot be opened and closed, a pressure drilling tool is used to establish a new operation channel, and then a pressure valve replacement tool is used to replace the faulty valve; if the wellhead Christmas tree component seal steel ring leaks, and the gathering pipeline fails due to third party intrusion or leakage, a valve repair tool is used for pressure plugging repair.

[0090] The working process of the emergency shut-off device is as follows:

[0091] During normal production, the shut-off device is in an open state, and there is a certain distance between the closed valve core 1-34 sealing surface and the valve seat 1-28, and the pipeline gas enters the valve cover 1-25 through the high pressure end of the valve body 1-27, then enters the low pressure end through the suspension core 1-31 and the side hole of the closed valve core 1-34, forming a gas flow channel.

[0092] When the pipeline needs to be shut off, the program gives a command to the motor 1-1, the motor 1-1 rotates to drive the pinion 1-5, the gear 1-7 and the screw nut 1-12 to rotate, the screw rod 1-11 moves downward to push the valve rod 1-24 and the closed valve core 1-34 to move downward to the valve seat 1-28, the fourth sealing ring 1-33 on the closed valve core 1-34 is sealed with the valve seat 1-28, and the pipeline is shut off.

[0093] When the pressure sensor 1-19 detects that the pipeline pressure exceeds or is lower than the set value, the control system will automatically give a command to the motor 1-1 to execute the valve closing action.

[0094] When the upstream pipeline is suddenly pressurized or the downstream pipeline is suddenly depressurized, the motor 1-1 does not need to act, the slider 1-18 moves downward in the sleeve 1-17, drives the valve stem 1-24 and the closing valve core 1-34 to move downward to the valve seat 1-28, the fourth sealing ring 1-33 on the closing valve core 1-34 is sealed with the valve seat 1-28, and the pipeline is cut off. In this process, the key is that there is a certain free travel between the slider 1-18 and the sleeve 1-17, the valve stem 1-24 and the closing valve core 1-34 are in a suspended static equilibrium state under the action of gas pressure, and when the pipeline pressure fluctuates greatly, the slider 1-18 can drive the valve stem 1-24 and the closing valve core 1-34 to move downward to the valve seat 1-28.

[0095] When the pipeline in the cut-off state needs to be opened to restore the pipeline, the control system gives the motor 1-1 a command, the motor 1-1 rotates to drive the pinion 1-5, the gear 1-7 and the screw nut 1-12 to rotate, the screw 1-11 moves upward, pulls the valve stem 1-24 and the closing valve core 1-34 to move upward away from the valve seat 1-28 by a certain distance, and the fourth sealing ring 1-33 on the closing valve core 1-34 is out of the valve seat 1-28, and the pipeline gas flow passage is opened. In this process, the key is that the closing valve core 1-34 is lifted using two-stage lifting, and when the motor 1-1 pulls the valve stem 1-24 upward, the fifth sealing ring 1-36 between the valve stem 1-24 and the closing valve core 1-34 is first pulled open, so that the upstream and downstream gas flows open a small passage, and after the pipeline pressure is balanced for a period of time, the closing valve core 1-34 is lifted again to make the fourth sealing ring 1-33 between the closing valve core 1-34 and the valve seat 1-28 disengage. This process greatly reduces the power of the motor 1-1, and a small voltage and low power can make the fifth sealing ring 1-36 at the lower end of the valve stem 1-24 disengage from the closing valve core 1-34, first forming a small gas flow passage, and then easily lifting the closing valve core 1-34 to form a large gas flow passage.

[0096] The use engineering of the pressure repair valve tool is as follows:

[0097] Taking the commonly used gas wellhead KQ65-70 gas tree, which needs to repair the No. 1 master control valve 2-27, as an example. It is found on site that the No. 1 master control valve 2-27 of the gas tree is seriously leaking, and the wellhead No. 1 master control valve 2-27 needs to be repaired under pressure. The wellhead oil pressure is 9.2 MPa, and the casing pressure is 14.2 MPa.

[0098] I. Construction preparation

[0099] 1. After the construction team arrives at the site, set up a safety warning area according to the requirements, place and fix the fire emergency equipment, safety warning signs, wind direction indicators, and escape route signs according to the requirements. Personnel unrelated to construction and on-site construction supervision and monitoring are not allowed to enter the safety warning area. Place the valve repair tools neatly and check the tools and equipment.

[0100] 2. On-site staff wear PPE and need to be equipped with safety belts when working at height;

[0101] 3. Record the wellhead pressure.

[0102] 4. On-site measurement to determine the location of the plug and make a record.

[0103] 5. Safety education for construction personnel.

[0104] II. Operation process

[0105] 1. Preparation

[0106] Place the pressure repair valve tool and supporting equipment in order, inspect the tool and equipment, clean the repair valve tool and supporting equipment, connect the hydraulic console and fill it with oil, and place the equipment in order. Completely close the No. 4 valve 2-26 and check for no leakage, operate the gas production wellhead according to the gas production process, remove the upper part of the No. 4 valve 2-26 of the gas production wellhead and place it in the designated position.

[0107] Install the blowout flange B2-7 to the No. 4 valve 2-26, the blowout flange B2-7 is above the hydraulic cylinder short section, hydraulic cylinder 2-12, plug rod, connect the hydraulic console and perform trial operation.

[0108] The tool is subjected to air tightness test according to the test process requirements to ensure that the device has no leakage within the rated pressure stable time period.

[0109] 2. Operation steps

[0110] Open the No. 4 valve 2-26 and the No. 1 master control valve 2-27, control the hydraulic station to inject oil into the upper chamber of the hydraulic cylinder through the hydraulic console, make the piston rod 2-23 with the plug down to the designated position, press the piston rod 2-23 through the fixed nut 2-24 on the piston rod 2-23, then loosen the center rod pressure cap 2-25, the center rod 2-6 moves upward, the plug is sealed, the center rod 2-6 is pushed downward to give the sealing rubber tube 2-4 secondary pressure, extrude the sealing rubber tube 2-4, make the plug more safe and reliable, then observe the pressure gauge value of the blowout flange 7, open the blowout flange B2-7 after the pressure gauge value is stable, discharge the medium in the cavity between the plug rod and the blowout flange, close the air valve, observe the pressure gauge value for 30 minutes without change, the plugging is completed.

[0111] In the plugging state, disassemble the faulty valve according to the assembly process, repair the damaged parts of the valve, and restore the valve after the parts repair or replacement is completed.

[0112] Remove the non-hand beam, operate the center rod, move the center rod, remove the plugging part, then inject oil into the lower chamber of the hydraulic cylinder through the hydraulic station until the oil cylinder moves up to the top end of the hydraulic cylinder and stops.

[0113] 4) Disassembly device: close the standby gate valve, and disassemble the tool, clean the site.

[0114] The use process of the tool for replacing the valve under pressure is as follows:

[0115] With the commonly used gas wellhead KQ65-70 gas tree, the No. 1 master control valve 2-27 needs to be replaced. It is found on site that the No. 1 master control valve of the gas tree has serious internal leakage, and the wellhead No. 1 master control valve needs to be replaced. The wellhead oil pressure is 8Mpa, and the casing pressure is 13.5Mpa.

[0116] I. Construction preparation

[0117] 1. After the construction team arrives at the site, set up the safety warning area as required, place and fix the fire emergency equipment, safety warning signs, wind vane, and escape route signs as required. Personnel unrelated to construction and site construction supervision and monitoring are not allowed to enter the safety warning area. Place the valve replacement device neatly, and check the tools and equipment.

[0118] 2. The site workers wear PPE, and need to be equipped with safety belts when working at height;

[0119] 3. Record the wellhead pressure.

[0120] 4. Measure the plugging position on site and make a record.

[0121] 5. Conduct safety education for construction personnel.

[0122] II. Operation process

[0123] 1. Preparation

[0124] Place the valve replacement device and supporting equipment neatly, and check the tools and equipment. Take out the valve replacement device and supporting equipment, wipe them clean, connect the hydraulic control cabinet, place it neatly, fill the hydraulic control console with oil; completely close the No. 4 valve 2-26 and check for no leakage, operate the gas wellhead according to the gas production process, remove the upper part of the No. 4 valve 2-26 of the gas wellhead, and place it in the designated position.

[0125] Install the left and right columns, install the column fixing nuts on the large four-way flange, and then install the left and right columns, blowout preventer flange, hydraulic cylinder assembly, plugging device assembly, centralizer crossbeam, and hydraulic control console. After the special tools are installed in place, perform a trial run. The device is subjected to a gas tightness test according to the test process requirements to ensure that the device has no leakage within the rated pressure and stable pressure period.

[0126] 2. Operation steps

[0127] The hydraulic station is controlled by the hydraulic console to inject oil into the upper cavity of the hydraulic cylinder, so that the piston rod 2-23 with the plug goes down. The pressure of the hydraulic oil injected by the hydraulic station should be similar to the pressure of the wellhead natural gas, and slightly higher than the wellhead pressure. The piston rod 2-23 continues to go down until the piston rod 2-23 drives the plug to the designated position, and the piston rod 2-23 is pressed tightly through the fixed nut 2-24 on the piston rod 2-23.

[0128] Loosen the center rod pressure cap 2-25, move the center rod 2-6 upward, seal the plug, and pressurize the sealing rubber tube 2-4 again through the shaft sleeve 2-14 of the center rod 2-6 to extrude the sealing rubber tube 2-4 to stabilize the sealing effect, so that the plug is more safe and reliable. Open the gas vent valve on the blowout flange, discharge the medium above the plug, then close the gas vent valve, and wait for 10 minutes to check whether there is pressure value change on the pressure gauge. If there is no pressure change, the plugging is completed.

[0129] Remove the 8 bolts connecting the gate valve to be replaced with the flange on the large four-way joint, then control the hydraulic station to inject oil into the upper cavity of the hydraulic cylinder through the hydraulic console. At this time, the hydraulic cylinder 2-12 with the disassembled No. 1 master control valve goes down until the hydraulic cylinder goes up to the top of the hydraulic cylinder 2-12 and stops. Install the locking cross beam to fix the plug rod.

[0130] Remove the movable joint assembly on the plug. At this time, the plug is partially left in the wellhead large four-way joint passage. Control the plug through the locking cross beam, remove the No. 1 master control valve 2-26 to be replaced, replace the new No. 1 master control valve 2-26, and connect the new No. 1 master control valve 2-26 with the blowout flange through bolts and nuts, and fix it on the hydraulic cylinder.

[0131] Inject oil into the upper cavity of the oil cylinder to make the piston rod go down, prepare the connecting threads of the plug, and ensure that the plug does not rotate. At the same time, the piston rod must be rotated in the positive direction at the upper end of the piston rod until the connecting threads of the piston rod and the movable connection assembly are tightened. Fix the piston rod through the fixed nut through the righting cross beam, and remove the locking cross beam. Control the hydraulic station through the hydraulic console to inject oil into the lower cavity of the hydraulic cylinder, so that the new No. 1 master control valve 2-26 is connected with the flange on the large four-way joint, and the No. 1 master control valve 2-26 is installed. At this time, loosen the fixed nut on the piston rod to release the piston rod. Inject oil into the lower cavity of the hydraulic cylinder, and the piston rod with the plug automatically retracts into the hydraulic short section. Close the No. 4 valve 2-27.

[0132] 3. Disassembly device: disassembly tool, restore wellhead, clean up the site.

[0133] The use process of the under-pressure drilling tool is as follows:

[0134] Take the double tubing Christmas tree No. 1 gate valve gate plate drilling produced by Shanghai No. 2 Petroleum Machinery Factory as an example, the wellhead No. 1 master valve screw breaks, the flat gate valve cannot be opened, and it is necessary to drill under pressure to establish a new operation channel, and the wellhead oil pressure is 10 MPa.

[0135] I. Construction preparation

[0136] 1. After the construction team arrives at the site, set up the safety warning area as required, place and fix the fire emergency equipment, safety warning signs, wind vane, and escape route signs as required. Personnel unrelated to construction and on-site construction supervision and monitoring are not allowed to enter the safety warning area. Workers' mobile phones must not be taken into the wellhead area. Place the drilling device neatly and check the tools and equipment.

[0137] 2. The on-site workers wear PPE, and need to be equipped with safety belts during high-altitude operations.

[0138] 3. Record the wellhead pressure.

[0139] 4. Measure the drilling tool drill rod length and the faulty valve plate depth position on site and make a record.

[0140] 5. Conduct safety education for construction personnel.

[0141] II. Operation process

[0142] 1. Preparation

[0143] Place the pressure drilling device and supporting equipment neatly and check the tools and equipment. Take out the drilling device and supporting equipment, wipe them clean, connect the hydraulic control cabinet, place it neatly, fill the hydraulic control console with oil, completely close the No. 4 gate valve and check for leaks, operate the gas production wellhead according to the gas production process, remove the upper part of the No. 4 gate valve of the gas production wellhead, and place it in the designated location.

[0144] 2. Drilling operation steps

[0145] 2.1 Remove the 2 pairs of bolts on the flange of the original wellhead large four-way cross, install the fixed seat on the large four-way cross, then install a pair of columns on the fixed seat, install a 3 1 / 2'EUE conversion flange on the upper end of the Christmas tree, install a manual control valve on the conversion flange, connect the blowout preventer with the control valve, connect the columns and the blowout preventer with the lower centralizing beam, install the oil cylinder cross beam, the upper oil cylinder cross beam, and fix the double hydraulic cylinders on the two columns, and install the drill bit, centralizing sleeve, drill rod extension rod, drill rod, and other accessories. Tighten the bolts at each location, open and close the valves as required, complete the preparation work before drilling, and the valve plate thickness is 50 mm.

[0146] 2.2 Connect the drill rod to the lower centralizing cross beam and adjust the drill rod to ensure the centering of the drilling.

[0147] 2.3 Drilling device pressure test:

[0148] The drilling device is required to do a hydrostatic test to ensure that the wellhead pressure is stable for 15 minutes without leakage when the pressure is 21 MPa.

[0149] 2.4 Open the hydraulic control console and check the panel display data, check the hydraulic cylinder system and hydraulic motor system.

[0150] 2.5 After starting drilling, open the cooling system, drive the hydraulic motor with the first booster pump for axial rotation, and drive the hydraulic cylinder with the second booster pump for feeding. Check the discharge of cuttings in the filter during drilling. This drilling uses a φ45mm drill bit with a depth of 45±1mm.

[0151] 2.6 After drilling to the designed depth, raise the drill rod, replace the drill bit with a φ60mm drill bit, and repeat step 2.5.

[0152] 2.7 Raise the drill rod and replace the positioning drill bit with a special drill bit for drilling.

[0153] 2.8 Under axial pressure, drill through the gate, and ensure that the total stroke of the drilling tool is sufficient to drill through the gate.

[0154] 2.9 Raise the reaming drill bit, close the control valve, and remove the drilling tool to complete the drilling and reaming process.

[0155] 3. Restore the well site: Clean the work site, handle special items according to relevant regulations, prevent waste from polluting the environment, and complete the work record.

Claims

1. An all-time intelligent management system for oil and gas pipeline network, characterized in that, The application relates to a gas pipeline emergency shutdown device, which comprises optical fibers laid between gas well heads and gas gathering stations or between gas gathering stations or along long-distance gas pipelines; a control system is arranged in the gas gathering station, and the optical fibers are connected with the control system; the control system is used for closing the emergency shutdown device arranged on the gas pipeline according to alarm data collected by the optical fibers and performing valve repairing or replacing according to valve fault of the shutdown pipeline; The emergency shutdown device comprises a valve body (1-27), the high-pressure end of the valve body (1-27) is connected with an upstream pipeline of the gas pipeline, the low-pressure end of the valve body (1-27) is connected with a downstream pipeline of the gas pipeline, a valve cover (1-25) is connected with the valve body (1-27), and a top cover (1-22) is connected with the valve cover (1-25); When the valve is repaired, a pressure repairing tool is used, the pressure repairing tool comprises a valve connected with a well head big four-way flange, a blowout preventer B (2-7) connected with the upper portion of the valve, a hydraulic cylinder (2-12) connected with the upper portion of the blowout preventer B (2-7) through a hydraulic cylinder short section, a plug rod inserted in the hydraulic cylinder (2-12) and extending out of the hydraulic cylinder (2-12), the plug rod comprises a plug, a piston rod (2-23) connected with the upper portion of the plug, and a center rod (2-6) inserted in the center hole of the plug and the center hole of the piston rod (2-23), the free end of the center rod (2-6) extends out of the end of the piston rod (2-23), and the end of the piston rod (2-23) is fixed to the center rod (2-6) through a fixed nut (2-24) and a center rod pressing cap (2-25); The plug comprises a sleeve (2-2) connected with the piston rod (2-23), the free end of the sleeve (2-2) is connected to a sealing rubber tube (2-4), and the free end of the sealing rubber tube (2-4) is fixed through a plug (2-3); The blowout preventer B (2-7) or the hydraulic cylinder (2-12) is connected with a righting cross beam (2-8), the piston rod (2-23) of the upper portion of the plug rod is connected with a non-dropping cross beam (2-11), the two ends of the righting cross beam (2-8) and the non-dropping cross beam (2-11) are connected through a first vertical column (2-5) and a second vertical column (2-10) respectively, the blowout preventer B (2-7) is provided with a pressure relief valve and a pressure gauge, and the blowout preventer B is sealed through combined sealing. The upper part of the sleeve (2-2) is connected with a plug connector rod (2-13), the upper part of the plug connector rod (2-13) is connected with a plug upper connector (2-18), the upper part of the plug upper connector (2-18) is connected to a piston rod (2-23) through a movable connection assembly, the center of the hollow of the plug upper part, the hollow of the plug upper connector (2-18), the hollow of the movable connection assembly and the center hole of the piston rod (2-23) are provided with a center rod (2-6), the plug connector rod (2-13) is internally provided with a shaft sleeve (2-14), the lower part of the plug connector rod (2-13) is connected to the sleeve (2-2), the upper end of the shaft sleeve (2-14) is connected with the center rod (2-6), the lower end is connected with a center shaft (2-15), the free end of the center shaft (2-15) is provided in the hollow of the sleeve (2-2), the sealing rubber tube (2-4) and the plug (2-3), and the plug (2-3) is threadedly connected with the center shaft (2-15); The inside of the plug connector rod (2-13) is a light hole, the outside of the shaft sleeve (2-14) is a light rod, and the shaft sleeve (2-14) and the plug connector rod (2-13) are gap fitted; The movable connection assembly comprises a movable connector connector (2-20) connected with the plug upper connector (2-18), the movable connector connector (2-20) is connected to a movable connector (2-19) through a pressure cap (2-22), a movable connector snap ring (2-21) is arranged between the movable connector connector (2-20) and the pressure cap (2-22), and the movable connector (2-19) is connected with the piston rod (2-23); The first sealing element (2-16) is arranged between the plug connector rod (2-13) and the sleeve (2-2), and the second sealing element (2-17) is arranged between the sleeve (2-2) and the center shaft (2-15); The piston rod (2-23) and the center rod (2-6) are gap fitted; The first vertical column (2-5) and the righting cross beam (2-8) and the non-dropping cross beam (2-11) are fixed through the limiting nut (2-9), and the second vertical column (2-10) and the righting cross beam (2-8) and the non-dropping cross beam (2-11) are fixed through the limiting nut (2-9).

2. The full-time intelligent management system for oil and gas pipeline network according to claim 1, characterized in that, The top cover (1-22) is connected with an upper cover (1-15), the upper cover (1-15) is connected with a mounting bottom plate (1-3), the mounting bottom plate (1-3) is connected with a motor (1-1), the upper cover (1-15) is penetrated with a screw nut (1-12) through a bearing (1-14), the output shaft of the motor (1-1) is connected with a pinion (1-5) through a first key (1-6), the pinion (1-5) is engaged with a large gear (1-7) connected with the screw nut (1-12), the large gear (1-7) and the screw nut (1-12) are connected through a key and are fixed by a locking nut (1-8), the screw nut (1-12) is penetrated with a screw rod (1-11) matched therewith, the bottom of the screw rod (1-11) is connected to a sliding sleeve (1-17) through an anti-rotation support (1-16), the sliding sleeve (1-17) is provided with a sliding block (1-18), the sliding block (1-18) is connected with a valve rod (1-24) penetrated in the sliding sleeve (1-17), the lower part of the valve rod (1-24) is connected to a closing valve element (1-34) through the top cover (1-22), the lower part of the top cover (1-22) is connected to a valve seat (1-28) provided in a valve body (1-27) through a hanging core (1-31), the closing valve element (1-34) is located inside the hanging core (1-31), the valve seat (1-28) is provided with a spring (1-29), the upper part of the closing valve element (1-34) is provided with a locking cap (1-35) matched with the valve rod (1-24), the sidewall of the top cover (1-22) is provided with a detection port, the detection port is connected with a high-pressure stop valve (1-20), and a pressure sensor (1-19) is arranged between the detection port and the high-pressure stop valve (1-20).

3. The all-time intelligent management system for oil and gas pipeline network according to claim 2, characterized in that, The motor (1-1) is connected to the mounting bottom plate (1-3) through the explosion-proof box (1-2); the outer side of the screw nut (1-12) is connected with a handle nut (1-9) through a second key (1-13); the top of the screw nut (1-12) is connected with a screw rod protection cap (1-10); the valve cover (1-25) is connected with the valve body (1-27) through a plurality of high-strength bolts (1-32), and the connection between the valve cover (1-25) and the valve body (1-27) is provided with a sealing gasket ring (1-30); the mounting bottom plate (1-3) is connected with a protective cover (1-4) capable of protecting the large gear (1-7) and the pinion (1-5); the position where the valve rod (1-24) penetrates the top cover (1-22) is provided with a first sealing ring (1-21), the connection between the top cover (1-22) and the valve cover (1-25) is provided with a second sealing ring (1-23), the connection between the valve seat (1-28) and the valve body (1-27) is provided with a third sealing ring (1-26), the closing valve element (1-34) is provided with a fourth sealing ring (1-33) matched with the valve seat (1-28), and the lower end of the valve rod (1-24) is provided with a fifth sealing ring (1-36) matched with the closing valve element (1-34).

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