All-electrically-driven subsurface safety valve and control system and use method thereof

Abstract

The invention discloses an all-electrically-driven subsurface safety valve and a control system and a using method thereof. The all-electrically-driven subsurface safety valve comprises an outer pressure-bearing cylinder and further comprises a pusher and a clasping device; the pusher and the clasping device are both sleeved with the outer pressure-bearing cylinder, the pusher is arranged above the clasping device, and a valve assembly is arranged at the lower end of the pusher; and both the pusher and the holding device are provided with underground sensors. All-electric driving is adopted, the reaction speed of the safety valve under the emergency condition can be greatly increased, the all-electric driving safety valve has better sealing conditions, dynamic sealing is not needed, moving parts are all in a sealed environment, the working conditions are improved, equipment operation is more reliable, the structure is simple, complex mechanical structures are not needed, and the safety valve is suitable for large-scale popularization and application. Meanwhile, a hydraulic power unit and a hydraulic pipeline are not needed, and the system cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum engineering, in particular to a fully electrically driven downhole safety valve and a control system and a use method thereof. Background Art

[0002] Due to the particularity of offshore safety, once a blowout, oil spill, fire or other accidents occur, the consequences and secondary disasters are far greater than those in onshore oil fields. The American Petroleum Institute and domestic well control safety regulations require that oil and water wells in offshore oil fields be equipped with safety control devices. Downhole safety valves are an important part of the downhole safety control system. They are devices that automatically shut down the well when a major failure occurs at the wellhead. They protect equipment, prevent production losses, protect the environment, and prevent pollution caused by oil and gas blowouts.

[0003] Safety valves are divided into two types: electronically controlled and hydraulically controlled. For electronically controlled safety valves, there are difficult problems to solve, such as power transmission seals and motor performance that cannot meet the requirements. Even though they have advantages in terms of insertion depth, electronically controlled safety valves are rarely used in China. All downhole safety valves used in domestic offshore oil fields are hydraulically controlled. The system includes an underground safety valve, a hydraulic station on the ground, and a hydraulic control pipeline connecting the two parts. The hydraulically controlled downhole safety valve uses hydraulics as the driving force. Due to the limitations of hydraulics and hydraulic pipelines themselves, the hydraulically controlled downhole safety valve has high requirements for control fluid. The mechanical structure of the safety valve is complex, the hydraulic control response time is long, and it is greatly affected by temperature, which is not conducive to safe closure in emergency situations. The valve opening is controlled by the hydraulic pipeline, and the depth of the safety valve is limited by the pressure of the wellbore liquid.

[0004] Publication (Announcement) No.: CN111425164B, discloses a fully electrically driven downhole safety valve and its digital twin control method and system. The fully electrically driven downhole safety valve includes a fully electrically driven downhole safety valve structure and a fully electrically driven downhole safety valve control system. According to the fully electrically driven downhole safety valve structure and the fully electrically driven downhole safety valve control system, the modeling method of the fully electrically driven downhole safety valve digital twin control system includes five steps of establishing a permanent magnet synchronous servo frameless motor motion model, establishing an electromagnetic brake braking model, establishing a safety valve structure model, establishing a safety valve control model and establishing a fully electrically driven downhole safety valve digital twin control system. The established fully electrically driven downhole safety valve digital twin control system includes a permanent magnet synchronous servo frameless motor motion model, an electromagnetic brake braking model, a central model calculation module, a safety valve structure model and a safety valve control model.

[0005] The drive device and brake device of the prior art have complex structures, are prone to failure in underground environments, and are not easy to set up redundant components.

[0006] Publication (Announcement) Number: CN214576901, which discloses a driving structure of an all-electrically driven downhole safety valve. This invention mainly adopts a worm and a turbine bar structure on the driver module of the all-electrically driven downhole safety valve. The motor is fixed on the motor mounting plate, the worm is installed on the motor shaft, the turbine bar and the outer pressure cylinder achieve the smooth up and down movement of the turbine bar through a guide rail mechanism, and the lower end of the turbine bar is fixed to the magnetic coupling structure. The motor drives the worm to perform a rotary motion, and the worm meshes with the turbine bar to convert the rotary motion into a linear motion, and the reciprocating linear motion is realized by the forward and reverse rotation of the motor to control the opening and closing of the valve. The advantages of this invention are as follows: The driving structure of the all-electrically driven downhole safety valve simplifies the overall structure while ensuring the response speed of the safety valve in case of emergency, greatly reduces the production and manufacturing cost, and facilitates the implementation of operations such as cleaning and lubrication.

[0007] This prior art uses a motor, a worm, and a turbine bar, and these three rotating components have technical problems of being prone to failure in the downhole environment.

[0008] Publication (Announcement) Number: CN110424925A, which discloses an electronically controlled magnetic coupling downhole safety valve. A torsion spring is installed on the valve seat and connected to the valve plate. A chute is opened on the outer wall of the safety valve housing. A moving center tube is installed inside the safety valve housing. An inner magnetic sleeve is wrapped around the outer wall of the moving center tube, and a fixed tube is sleeved in the upper inner space. An annular cavity is opened on the inner wall of the safety valve housing, and an outer magnetic sleeve is installed in the annular cavity. An isolation sleeve is arranged between the inner magnetic sleeve and the outer magnetic sleeve; A servo motor is arranged outside the safety valve housing. The rotor of the servo motor is connected to a reverse planetary roller screw. The lower part of the screw rod of the reverse planetary roller screw is connected to a push rod. The push rod and the inner magnetic sleeve are provided with key grooves at the same position, and the push rod is connected to the inner magnetic sleeve through a key. The beneficial effect of this invention is to eliminate the use of hydraulic oil, and at the same time eliminate the hydrostatic pressure and fluid friction required for quickly closing the valve plate in the past, and no longer be restricted by the running-in depth.

[0009] This prior art uses a servo motor and a planetary roller screw, and these two rotating components have technical problems of being prone to failure in the downhole environment.

[0010] In summary, the technical solutions, the technical problems to be solved, and the beneficial effects generated by the above disclosed technologies are all different from those of the present invention. For more technical features, the technical problems to be solved, and the beneficial effects of the present invention, there is no technical inspiration in the above disclosed technical documents. Summary of the Invention

[0011] Aiming at the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide an all-electrically driven downhole safety valve, its control system and usage method. This safety valve operates reliably, has a simple structure, does not require a complex mechanical structure, and at the same time does not require a hydraulic power unit and hydraulic pipelines, reducing system costs.

[0012] To achieve the above object, the present invention adopts the following technical solutions:

[0013] A fully electric-driven downhole safety valve includes an outer pressure-bearing cylinder, and also includes a pusher and a gripper; both the pusher and the gripper are sleeved inside the outer pressure-bearing cylinder, the pusher is above the gripper, and a valve assembly is arranged at the lower end of the pusher; both the pusher and the gripper are provided with downhole sensors.

[0014] Further, the pusher includes a slide rail, a pushing mechanism, a transmission reset mechanism, and a magnetic coupling linkage mechanism;

[0015] Specifically, both the pushing mechanism and the transmission reset mechanism are sleeved on the outer wall of the slide rail;

[0016] Specifically, the lower end of the pushing mechanism is connected to the upper end of the transmission reset mechanism;

[0017] Specifically, the magnetic coupling linkage mechanism is sleeved on the inner wall of the slide rail and corresponds to the transmission reset mechanism.

[0018] Further, the slide rail includes a slide rail inner pressure cylinder, and a chute is arranged on the outer wall of the slide rail inner pressure cylinder;

[0019] Specifically, the pushing mechanism includes a magnetic generation unit and a magnetic slider;

[0020] Specifically, the magnetic slider is provided with a slide bar, and the slide bar cooperates with the chute;

[0021] Specifically, the magnetic generation unit includes an optical fiber magnetic field sensor, a pusher coil, and a pusher iron core; the pusher iron core is installed on the inner wall of the outer pressure-bearing cylinder through internal screws;

[0022] Specifically, the pusher coil is wound around the outer wall of the pusher iron core; the optical fiber magnetic field sensor is installed at the upper end of the pusher iron core; the lower end of the magnetic slider is connected to the transmission reset mechanism.

[0023] Further, an upper buffer pad is arranged at the upper end of the chute, and a lower buffer pad is arranged at the lower end of the chute;

[0024] Specifically, at least two chutes are arranged and are evenly distributed circumferentially along the inner pressure cylinder of the slide rail, and the number of slide bars of the magnetic slider is the same as the number of chutes;

[0025] Specifically, at least two magnetic generation units are provided to form a pusher coil array and a pusher iron core array.

[0026] Further, the slide rail also includes a magnetic coupling sliding cylinder, and the inner wall of the upper end of the magnetic coupling sliding cylinder is connected to the outer wall of the lower end of the slide rail inner pressure cylinder;

[0027] Specifically, the transmission and reset mechanism includes a connecting cylinder, an external magnetic coupling cylinder, an external magnetic coupling magnetic ring, and a spring;

[0028] Specifically, the upper end of the connecting cylinder is connected to the lower end of the magnetic slider, and the lower end of the connecting cylinder is connected to the upper end of the external magnetic coupling cylinder;

[0029] Specifically, the external magnetic coupling cylinder is sleeved on the magnetic coupling sliding cylinder and can slide freely. A circular ring is provided on the outer wall of the upper end of the external magnetic coupling cylinder, and a first annular space is provided between the external magnetic coupling cylinder and the magnetic coupling sliding cylinder;

[0030] Specifically, the external magnetic coupling magnetic ring is arranged in the first annular space, and the lower end of the first annular space is closed by an external magnetic coupling end cover;

[0031] Specifically, the spring is sleeved on the magnetic coupling sliding cylinder. The upper end of the spring contacts the external magnetic coupling end cover, and the lower end contacts the valve assembly;

[0032] Specifically, an optical fiber stress and strain sensor is provided on the outer wall of the external magnetic coupling cylinder.

[0033] Further, the valve assembly includes a valve joint, a valve seat, a valve torsion spring, and a valve;

[0034] Specifically, a combined flow through hole is provided in the center of the valve joint, and a convex ring is provided in the combined flow through hole. The upper end of the valve joint is connected to the inner wall of the external pressure cylinder and the outer wall of the magnetic coupling sliding cylinder;

[0035] Specifically, the valve seat is arranged at the lower end of the valve joint. The valve is connected to the valve seat through a valve torsion spring, and the valve is pressed by the valve torsion spring on the combined flow through hole to close the combined flow through hole;

[0036] Specifically, an optical fiber pressure sensor is provided at the lower end of the valve joint.

[0037] Further, the magnetic coupling linkage mechanism includes an internal magnetic coupling end cover, an internal magnetic coupling magnetic ring, and an internal magnetic coupling flow tube;

[0038] Specifically, the internal magnetic coupling magnetic ring is installed on the outer wall of the internal magnetic coupling flow tube through the internal magnetic coupling end cover. The internal magnetic coupling end cover is arranged at the upper end of the outer wall of the internal magnetic coupling flow tube, and the internal magnetic coupling flow tube is arranged in the magnetic coupling sliding cylinder and can slide freely;

[0039] Specifically, the internal magnetic coupling magnetic ring is magnetically coupled with the external magnetic coupling magnetic ring;

[0040] Specifically, the lower end of the internal magnetic coupling flow tube is inserted into the convex ring of the combined flow through hole;

[0041] Specifically, a downward step is provided on the outer wall of the internal magnetic coupling flow tube, and the step can be engaged with the convex ring.

[0042] Further, the clamping device includes an upper end cover of the clamping device, wedge friction blocks, a core of the clamping device, a coil of the clamping device, an armature of the clamping device, and a lower end cover of the clamping device;

[0043] Specifically, the core of the clamping device is installed on the outer pressure-bearing cylinder by screws, and the coil of the clamping device is wound around the outer wall of the core of the clamping device;

[0044] Specifically, the upper end cover of the clamping device is arranged at the upper end of the core of the clamping device, and the lower end cover of the clamping device is arranged at the lower end of the core of the clamping device;

[0045] Specifically, the lower end cover of the clamping device is provided with a protrusion inside the core of the clamping device, and the lower end cover of the clamping device is provided with at least two grooves inside the core of the clamping device;

[0046] Specifically, the armature of the clamping device is installed on the protrusion of the lower end cover of the clamping device, and one wedge friction block is installed in one groove;

[0047] Specifically, when the armature of the clamping device moves upward, all the wedge friction blocks can be pushed out;

[0048] Specifically, at least one clamping device is provided, and a contact switch is arranged on the upper end cover of the uppermost clamping device.

[0049] Further, an upper oil pipe joint is arranged at the upper end of the inner pressure-bearing cylinder of the slide rail, a lower oil pipe joint is arranged at the lower end of the valve joint, and a connector is arranged on the upper oil pipe joint;

[0050] Specifically, the connection includes a wire-passing through hole and a wiring cap arranged at the lower end of the wire-passing through hole;

[0051] Specifically, a wire routing groove is formed in the inner wall of the outer pressure-bearing cylinder, and the control lines of the fiber optic magnetic field sensor, the pusher coil, the fiber optic stress and strain sensor, the coil of the clamping device, and the fiber optic pressure sensor all pass through the wire routing groove and are connected to the wiring cap;

[0052] Specifically, the fiber optic magnetic field sensor, the fiber optic stress and strain sensor, and the fiber optic pressure sensor are downhole sensors.

[0053] To achieve the above object, the present invention adopts the following technical solutions:

[0054] A control system for a fully electric downhole safety valve, comprising downhole sensors, a data acquisition module, a data demodulation module, a downhole information processing module, and a first controller; the data acquisition module is connected to the downhole sensors through optical fibers, and the data demodulation module is connected to the data acquisition module through optical fibers; the pressure information processing module is connected to the data demodulation module through a cable, the stress and strain information processing module is connected to the data demodulation module through a cable, the magnetic field information processing module is connected to the data demodulation module through a cable, the first controller is connected to the downhole information processing module through a cable, and the display module is connected to the first controller through a cable.

[0055] Further, a controller switching module is provided between the first controller and the display module, and a second controller with exactly the same structure and connection relationship as the first controller is also provided;

[0056] Specifically, the downhole sensors include an optical fiber magnetic field sensor, an optical fiber stress and strain sensor, and an optical fiber pressure sensor;

[0057] Specifically, the downhole information processing module includes a pressure information processing module, a stress and strain information processing module, and a magnetic field information processing module.

[0058] Further, the first controller includes a gripper monitoring module, a gripper power calculation module, a pusher power calculation module, a gripper power supply module, a controller status monitoring module, a pusher power supply module, and a central processing unit module;

[0059] Specifically, the gripper monitoring module is developed based on a single-chip microcomputer and is connected to the stress and strain information processing module;

[0060] Specifically, the gripper power calculation module is developed based on a DSP and is connected to the stress and strain information processing module;

[0061] Specifically, the pusher power calculation module is developed based on a DSP and is respectively connected to the pressure information processing module and the magnetic field information processing module;

[0062] Specifically, the gripper power supply module is developed based on an IGBT chip and is connected to the gripper power calculation and gripper monitoring modules;

[0063] Specifically, the pusher power supply module is developed based on an IGBT chip and is connected to the pusher motor calculation module;

[0064] Specifically, the controller status monitoring module is developed based on a single-chip microcomputer and is connected to the gripper monitoring module, the gripper power calculation module, the pusher power calculation module, the gripper power supply module, and the pusher power supply module;

[0065] Specifically, the central processing unit module is connected to the clamping device monitoring module, the clamping device power calculation module, the pusher power calculation module, the clamping device power supply module, the controller state monitoring module and the pusher power supply module through cables.

[0066] In order to achieve the above object, the present invention adopts the following technical solutions:

[0067] A method for using a fully electrically driven downhole safety valve comprises the following steps:

[0068] S1, when the valve needs to be opened, the downhole information processing module processes the information of the downhole sensor and transmits it to the first controller. Under the control of the first controller, the pusher coil is energized to push the magnetic slider downward, and the magnetic slider drives the outer magnetic coupling tube to move downward, compressing the spring. At the same time, due to the magnetic coupling effect, the inner magnetic coupling flow tube moves downward synchronously, pushing open the valve, and completing the opening;

[0069] S2. After the valve is fully opened, the protruding ring on the upper end of the external magnetic coupling tube touches the contact switch, disconnecting the power supply of the pusher coil. At the same time, the clamping coil is energized, and the clamping device clamps the external magnetic coupling tube to maintain the open state of the valve. The downhole information processing module processes the information of the downhole sensor and transmits it to the first controller. The first controller adjusts the current of the pusher coil in real time.

[0070] S3. When the valve needs to be closed, an operator on the well controls the central processing unit module to disconnect the power supply of the clamping device coil, and the clamping device releases the brake. Under the action of the spring, each structure is reset and the valve is closed.

[0071] Further, in S1, the pressure information processing module processes the pressure information of the optical fiber pressure sensor and calculates the current required by the pusher coil through the pusher power calculation module, and the pusher power supply module controls the alternate power supply to the pusher coil, and according to the magnetic field information collected by the optical fiber magnetic field sensor, the pusher power calculation module calculates and changes the current of the pusher coil in real time;

[0072] Specifically, in S2, the stress-strain information processing module processes the stress-strain information collected by the optical fiber stress-strain sensor, and transmits it to the clamping device power calculation module and the clamping device monitoring module at the same time. The clamping device power calculation module calculates and adjusts the current of the clamping device coil in real time according to the stress-strain information. The clamping device monitoring module determines the working state of the clamping device according to the stress-strain information, and evaluates whether to switch to the second clamping device or the two clamping devices to work at the same time.

[0073] Specifically, within the first controller, the controller status monitoring module evaluates the working status of each module of the first controller in real time. After detecting an abnormal operation, it is sent by the central processing unit module to the controller switching module, which then switches to the second controller to execute the control function. The operating status information of the all-electrically driven downhole safety valve is displayed in real time on the display module.

[0074] The present invention has the following beneficial effects compared with the prior art:

[0075] Adopting an all-electrically driven safety valve can greatly improve the response speed of the safety valve in emergency situations. The all-electrically driven safety valve has better sealing conditions, does not require dynamic seals, and all moving parts are in a sealed environment, improving the working conditions, making the equipment operation more reliable, with a simple structure that does not require complex mechanical structures. At the same time, it does not require a hydraulic power unit and hydraulic pipelines, reducing system costs. Brief Description of the Drawings

[0076] Figure 1 is a schematic structural diagram of an all-electrically driven downhole safety valve of the present invention;

[0077] Figure 2 is a schematic structural diagram of a control system of an all-electrically driven downhole safety valve of the present invention;

[0078] Figure 3 is Figure 1 a cross-sectional view taken along line A-A in

[0079] Figure 4 is a schematic structural diagram of a gripper of an all-electrically driven downhole safety valve of the present invention;

[0080] Figure 5 is a schematic structural diagram of the upper end cover of a gripper of an all-electrically driven downhole safety valve of the present invention;

[0081] Figure 6 is a schematic structural diagram of a transmission reset mechanism and a magnetic coupling linkage mechanism of an all-electrically driven downhole safety valve of the present invention;

[0082] In the figure: 1. Upper joint of tubing connection, 2. Connector, 3. Inner pressure cylinder of slide rail, 4. Upper buffer pad, 5. Fiber optic magnetic field sensor, 6. Pusher coil, 7. Pusher iron core, 8. Lower buffer pad, 9. Inner magnetic coupling end cover, 10. Inner magnetic coupling magnetic ring, 11. Outer magnetic coupling cylinder, 12. Outer magnetic coupling magnetic ring, 13. Fiber optic stress and strain sensor, 14. Contact switch, 15. Upper end cover of the gripper, 16. Wedge friction block, 17. Gripper iron core, 18. Gripper coil, 19. Gripper armature, 20. Lower end cover of the gripper, 21. Outer magnetic coupling end cover, 22. Magnetic coupling sliding cylinder, 23. Second gripper, 24. Spring, 25. Inner magnetic coupling flow tube, 26. Valve joint, 27. Valve seat, 28. Fiber optic pressure sensor, 29. Lower joint of tubing, 30. Valve torsion spring, 31. Valve, 32. Magnetic slider, 33. Outer pressure-bearing cylinder, 34. Connecting cylinder, 35. Data acquisition module, 36. Data demodulation module, 37. Pressure information processing module, 38. Stress and strain information processing module, 39. Magnetic field information processing module, 40. Gripper monitoring module, 41. Gripper power calculation module, 42. Pusher power calculation module, 43. Gripper power supply module, 44. Controller status monitoring module, 45. Pusher power supply module, 46. Central processing unit module, 47. First controller, 48. Controller switching module, 49. Second controller, 50. Display module. Detailed implementation mode

[0083] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0084] Embodiment 1:

[0085] Please refer to Figure 1 、 Figures 3 to 6 , a fully electric-driven downhole safety valve provided by the present invention includes an outer pressure-bearing cylinder 33, a pusher, and a gripper; the pusher and the gripper are both sleeved in the outer pressure-bearing cylinder 33, the pusher is above the gripper, and a valve assembly is arranged at the lower end of the pusher.

[0086] The pusher includes a slide rail, a pushing mechanism, a transmission and reset mechanism, and a magnetic coupling linkage mechanism; the pushing mechanism and the transmission and reset mechanism are both sleeved on the outer wall of the slide rail, the lower end of the pushing mechanism is connected to the upper end of the transmission and reset mechanism, and the magnetic coupling linkage mechanism is sleeved on the inner wall of the slide rail and corresponds to the transmission and reset mechanism.

[0087] The slide rail includes an inner pressure cylinder 3 of the slide rail, and a chute is provided on the outer wall of the inner pressure cylinder 3 of the slide rail; the pushing mechanism includes a magnetic generating unit and a magnetic slider 32, the magnetic slider 32 is matched with the chute through a slide bar, and the magnetic generating unit includes an optical fiber magnetic field sensor 5, a pusher coil 6, and a pusher iron core 7; the pusher iron core 7 is installed on the inner wall of the outer pressure cylinder 33 through an internal screw, the pusher coil 6 is wound around the outer wall of the pusher iron core 7, and the optical fiber magnetic field sensor 5 is installed at the upper end of the pusher iron core 7; an upper buffer pad 4 is provided at the upper end of the chute, and a lower buffer pad 8 is provided at the lower end, and the lower end of the magnetic slider 32 is connected to a transmission and reset mechanism.

[0088] At least two chutes are provided and are evenly distributed along the circumferential direction of the inner pressure cylinder 3 of the slide rail, and the number of slide bars of the magnetic slider 32 is the same as the number of chutes; at least two magnetic generating units are provided to form an array of pusher coils 6 and an array of pusher iron cores 7. The array of pusher coils 6 and the array of pusher iron cores 7 constitute a fixed end of the pusher; the magnetic slider 32 is a movable end of the pusher.

[0089] The slide rail further includes a magnetic coupling sliding cylinder 22, the upper inner wall of the magnetic coupling sliding cylinder is connected to the lower outer wall of the inner pressure cylinder 3 of the slide rail, and the transmission and reset mechanism includes a connecting cylinder 34, an outer magnetic coupling cylinder 11, an outer magnetic coupling magnetic ring 12, and a spring 24; the upper end of the connecting cylinder 34 is connected to the lower end of the magnetic slider 32, the lower end of the connecting cylinder 34 is connected to the upper end of the outer magnetic coupling cylinder 11, the outer magnetic coupling cylinder 11 is sleeved on the magnetic coupling sliding cylinder 22 and can slide freely, a circular ring is provided on the outer wall of the upper end of the outer magnetic coupling cylinder 11, a first annulus is provided between the outer magnetic coupling cylinder 11 and the magnetic coupling sliding cylinder 22, the outer magnetic coupling magnetic ring 12 is arranged in the first annulus, the lower end of the first annulus is closed by an outer magnetic coupling end cover 21, the spring 21 is sleeved on the magnetic coupling sliding cylinder 22, the upper end of the spring 21 contacts the outer magnetic coupling end cover 21, and the lower end contacts the valve assembly, and an optical fiber stress and strain sensor 13 is provided on the outer wall of the outer magnetic coupling cylinder 11.

[0090] The valve assembly includes a valve joint 26, a valve seat 27, a valve torsion spring 30, and a valve 31; a combined flow through hole is provided in the center of the valve joint 26, a convex ring is provided in the combined flow through hole, the upper end of the valve joint 26 is connected to the inner wall of the outer pressure cylinder 33 and the outer wall of the magnetic coupling sliding cylinder 22, the valve seat 27 is arranged at the lower end of the valve joint 26, the valve 31 is connected to the valve seat 27 through the valve torsion spring 30, the valve 31 is pressed on the combined flow through hole by the valve torsion spring 30 to close the combined flow through hole, and an optical fiber pressure sensor 28 is provided at the lower end of the valve joint 26.

[0091] The magnetic coupling linkage mechanism includes an inner magnetic coupling end cover 9, an inner magnetic coupling magnetic ring 10, and an inner magnetic coupling flow tube 25; the inner magnetic coupling magnetic ring 10 is installed on the outer wall of the inner magnetic coupling flow tube 25 through the inner magnetic coupling end cover 9, the inner magnetic coupling end cover 9 is arranged at the upper end of the outer wall of the inner magnetic coupling flow tube 25, the inner magnetic coupling flow tube 25 is arranged in the magnetic coupling sliding cylinder 22 and can slide freely, the inner magnetic coupling magnetic ring 10 is magnetically coupled with the outer magnetic coupling magnetic ring 12, the lower end of the inner magnetic coupling flow tube is inserted into the convex ring of the combined flow hole, and a downward step is arranged on the outer wall of the inner magnetic coupling flow tube 25, and the step can be engaged with the convex ring. When the outer magnetic coupling magnetic ring 12 moves downward, the inner magnetic coupling magnetic ring 10 is driven, so that the inner magnetic coupling flow tube 25 moves downward to push open the valve 31, and the spring 24 helps the outer magnetic coupling magnetic ring 12 to reset.

[0092] The gripper includes an upper gripper end cover 15, a wedge friction block 16, a gripper iron core 17, a gripper coil 18, a gripper armature 19, and a lower gripper end cover 20; the gripper iron core 17 is installed on the outer pressure cylinder 33 through screws, the gripper coil 18 is wound around the outer wall of the gripper iron core 17, the upper gripper end cover 15 is arranged at the upper end of the gripper iron core 17, the lower gripper end cover 20 is arranged at the lower end of the gripper iron core 17, the lower gripper end cover 20 is provided with a protrusion inside the gripper iron core 17, and the lower gripper end cover 20 is provided with at least two grooves inside the gripper iron core 17, as Figure 5 shown, the gripper armature 19 is installed on the protrusion of the lower gripper end cover 20, and a wedge friction block 16 is installed in one groove. When the gripper armature 19 moves upward, all the wedge friction blocks 16 can be pushed out, and a contact switch 14 is arranged at the upper end of the upper gripper end cover 15.

[0093] At least two grippers are provided, and a contact switch 14 is arranged at the upper end of the uppermost gripper. Taking two grippers as an example, a contact switch 14 is arranged at the upper end of the first gripper, and the second gripper 23 is installed at the lower end of the first gripper. When the upper ring of the outer magnetic coupling cylinder 11 contacts the contact switch 14, the gripper coil 18 is energized, the gripper armature 19 moves upward, and the wedge friction blocks 16 are pushed out to complete the clamping of the outer magnetic coupling cylinder 11.

[0094] An upper oil pipe joint 1 is arranged at the upper end of the inner pressure cylinder 3 of the slide rail, and a lower oil pipe joint 29 is arranged at the lower end of the valve joint 26.

[0095] The upper oil pipe joint 1 is provided with a connector 2, the connection includes a wire passing through hole and a wiring cap arranged at the lower end of the wire passing through hole. A wiring groove is opened on the inner wall of the outer pressure cylinder 33. The control lines of the fiber optic magnetic field sensor 5, the pusher coil 6, the fiber optic stress and strain sensor 13, the gripper coil 18, and the fiber optic pressure sensor 28 all pass through the wiring groove and are connected to the wiring cap.

[0096] The fiber optic magnetic field sensor 5, the fiber optic stress and strain sensor 13, and the fiber optic pressure sensor 28 are downhole sensors (5, 13, 28).

[0097] Embodiment 2:

[0098] Based on Embodiment 1, combined with Figure 2 , the present invention further includes a downhole safety valve control system with all-electric drive;

[0099] The downhole safety valve control system with all-electric drive includes downhole sensors (5, 13, 28), a data acquisition module 35, a data demodulation module 36, a pressure information processing module 37, a stress and strain information processing module 38, a magnetic field information processing module 39, a first controller 47, a controller switching module 48, a second controller 49, and a display module 50.

[0100] Among them, the downhole sensors (5, 13, 28) are used to collect the state information of the downhole safety valve with all-electric drive and transmit it to the wellhead. The data acquisition module 35 is connected to the downhole sensors (5, 13, 28) through optical fibers;

[0101] The data demodulation module 36 is connected to the data acquisition module 35 through optical fibers;

[0102] The pressure information processing module 37 is connected to the data demodulation module 36 through a cable;

[0103] The stress and strain information processing module 38 is connected to the data demodulation module 36 through a cable;

[0104] The magnetic field information processing module 39 is connected to the data demodulation module 36 through a cable;

[0105] The first controller 47 and the second controller 49 are respectively connected to the pressure information processing module 37, the stress and strain information processing module 38, and the magnetic field information processing module 39 through cables;

[0106] The controller switching module 48 is connected to the first controller 47 and the second controller 49 through a cable;

[0107] The display module 50 is connected to the first controller 47, the second controller 49, and the controller switching module 48 through cables.

[0108] The second controller 49 has the same internal modules as the first controller 47 and the same functions, and is used for redundant control. Taking the first controller 47 as an example, it includes a gripper monitoring module 40, a gripper power calculation module 41, a pusher power calculation module 42, a gripper power supply module 43, a controller status monitoring module 44, a pusher power supply module 45, and a central processing unit module 46.

[0109] Among them, the gripper monitoring module 40 is developed based on a single-chip microcomputer and is connected to the stress and strain information processing module 38 through a cable;

[0110] The gripper power calculation module 41 is developed based on a DSP and is connected to the stress and strain information processing module 38 through a cable;

[0111] The pusher power calculation module 42 is developed based on a DSP and is connected to the pressure information processing module 37 and the magnetic field information processing module 39 through cables respectively;

[0112] The gripper power supply module 43 is developed based on an IGBT chip and is connected to the gripper power calculation and gripper monitoring module 40 through a cable;

[0113] The pusher power supply module 45 is developed based on an IGBT chip and is connected to the pusher motor calculation module through a cable;

[0114] The controller status monitoring module 44 is developed based on a single-chip microcomputer and is connected to the gripper monitoring module 40, the gripper power calculation module 41, the pusher power calculation module 42, the gripper power supply module 43 and the pusher power supply module 45 through cables;

[0115] The central processing unit module 46 is connected to the gripper monitoring module 40, the gripper power calculation module 41, the pusher power calculation module 42, the gripper power supply module 43, the controller status monitoring module 44 and the pusher power supply module 45 through cables.

[0116] It should be noted that the modules and controllers used are existing technologies. After purchasing them from the market, they can be wired according to the method described in this specification.

[0117] Embodiment 3:

[0118] This embodiment provides a method for using this device, including the following steps,

[0119] S1, when it is necessary to open the valve 31, the pressure information processing module 37 processes the pressure information at the valve 31 and calculates the current required for the pusher coil 6 through the pusher power calculation module 42. The pusher power supply module 45 controls the alternate energization of the pusher coil 6, and according to the magnetic field information collected by the fiber optic magnetic field sensor 5, the pusher power calculation module 42 calculates and changes the current magnitude of the pusher coil 6 in real time, driving the magnetic slider 32 to move downward. The magnetic slider 32 drives the outer magnetic coupling cylinder 11 to move downward, compressing the spring 24. At the same time, due to the magnetic coupling effect, the inner magnetic coupling flow tube 25 moves downward synchronously, pushing open the valve 31 to complete the opening;

[0120] S2. After the valve 31 is fully opened, the protruding ring at the upper end of the outer magnetic coupling cylinder 11 touches the contact switch 14, disconnecting the power supply to the pusher coil 6. At the same time, the holding device power supply module 43 supplies power to the holding device coil 18, and the holding device clamps the outer magnetic coupling cylinder 11 to maintain the open state of the valve 31. The stress and strain information processing module 38 processes the stress and strain information collected by the fiber optic stress and strain sensor 13 and transmits it to the holding device power calculation module 41 and the holding device monitoring module 40 simultaneously. The holding device power calculation module 41 calculates and adjusts the current magnitude of the holding device coil 18 in real time according to the stress and strain information. The holding device monitoring module 40 judges the working state of the holding device according to the stress and strain information and evaluates whether to switch to the second holding device 23 for operation or both holding devices to operate simultaneously. The controller status monitoring module 44 evaluates the working state of each module of the controller in real time. After detecting an abnormal operation, it is sent by the central processing unit module 46 to the controller switching module 48 to switch to the second controller 49 to execute the control function. The operating status information of the all-electrically driven downhole safety valve is displayed in real time on the display module 50.

[0121] S3. When it is necessary to close the valve 31, an operator above the well disconnects the power supply of the holding device coil 18 through the control of the central processing unit module 46. The holding device releases the brake, and under the action of the spring 24, each structure resets and the valve 31 closes.

[0122] In this application, all the components that are not elaborated and the connection methods of the various components in this application belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0123] In the present invention, the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0124] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the present invention.

[0125] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0126] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fully electric-driven downhole safety valve, comprising an external pressure-bearing cylinder, Characterized in that, It further includes a pusher and a gripper; Both the pusher and the gripper are sleeved inside the external pressure-bearing cylinder. The pusher is above the gripper, and a valve assembly is arranged at the lower end of the pusher; Both the pusher and the gripper are provided with downhole sensors.

2. The fully electric-driven downhole safety valve according to claim 1, Characterized in that, The pusher includes a slide rail, a pushing mechanism, a transmission reset mechanism, and a magnetic coupling linkage mechanism; Both the pushing mechanism and the transmission reset mechanism are sleeved on the outer wall of the slide rail; The lower end of the pushing mechanism is connected to the upper end of the transmission reset mechanism; The magnetic coupling linkage mechanism is sleeved on the inner wall of the slide rail and corresponds to the transmission reset mechanism.

3. The fully electric-driven downhole safety valve according to claim 2, Characterized in that, The slide rail includes a slide rail inner pressure cylinder, and a chute is arranged on the outer wall of the slide rail inner pressure cylinder; The pushing mechanism includes a magnetic generation unit and a magnetic slider; The magnetic slider is provided with a slide bar, and the slide bar cooperates with the chute; The magnetic generation unit includes an optical fiber magnetic field sensor, a pusher coil, and a pusher iron core; the pusher iron core is installed on the inner wall of the external pressure-bearing cylinder through internal screws; The pusher coil is wound around the outer wall of the pusher iron core; the optical fiber magnetic field sensor is installed at the upper end of the pusher iron core; the lower end of the magnetic slider is connected to the transmission reset mechanism.

4. The fully electric-driven downhole safety valve according to claim 3, Characterized in that, An upper buffer pad is arranged at the upper end of the chute, and a lower buffer pad is arranged at the lower end; At least two chutes are arranged and are evenly distributed along the circumferential direction of the slide rail inner pressure cylinder. The number of slide bars of the magnetic slider is the same as the number of chutes; At least two magnetic generation units are provided to form a pusher coil array and a pusher iron core array.

5. The fully electric-driven downhole safety valve according to claim 3, Characterized in that, The slide rail further includes a magnetic coupling sliding cylinder, and the inner wall of the upper end of the magnetic coupling sliding cylinder is connected to the outer wall of the lower end of the slide rail inner pressure cylinder; The transmission reset mechanism includes a connection cylinder, an external magnetic coupling cylinder, an external magnetic coupling magnetic ring, and a spring; The upper end of the connection cylinder is connected to the lower end of the magnetic slider, and the lower end of the connection cylinder is connected to the upper end of the external magnetic coupling cylinder; The external magnetic coupling cylinder is sleeved on the magnetic coupling sliding cylinder and can slide freely. A ring is arranged on the outer wall of the upper end of the external magnetic coupling cylinder, and a first annulus is arranged between the external magnetic coupling cylinder and the magnetic coupling sliding cylinder; The external magnetic coupling magnetic ring is arranged in the first annulus, and the lower end of the first annulus is closed by an external magnetic coupling end cap; The spring is sleeved on the magnetic coupling sliding cylinder. The upper end of the spring contacts the external magnetic coupling end cap, and the lower end contacts the valve assembly; An optical fiber stress and strain sensor is arranged on the outer wall of the external magnetic coupling cylinder.

6. The fully electric-driven downhole safety valve according to claim 5, Characterized in that, The valve assembly includes a valve joint, a valve seat, a valve torsion spring, and a valve; A combined flow-through hole is arranged at the center of the valve joint, a convex ring is arranged in the combined flow-through hole, and the upper end of the valve joint is connected to the inner wall of the external pressure-bearing cylinder and the outer wall of the magnetic coupling sliding cylinder; The valve seat is arranged at the lower end of the valve joint. The valve is connected to the valve seat through a valve torsion spring. The valve is pressed by the valve torsion spring onto the combined flow through hole to close the combined flow through hole. A fiber optic pressure sensor is arranged at the lower end of the valve joint.

7. An all-electrically driven downhole safety valve according to claim 6, characterized in that the magnetic coupling linkage mechanism includes an inner magnetic coupling end cover, an inner magnetic coupling magnetic ring, and an inner magnetic coupling flow tube; the inner magnetic coupling magnetic ring is installed on the outer wall of the inner magnetic coupling flow tube through the inner magnetic coupling end cover. The inner magnetic coupling end cover is arranged at the upper end of the outer wall of the inner magnetic coupling flow tube. The inner magnetic coupling flow tube is arranged inside the magnetic coupling sliding cylinder and can slide freely; the inner magnetic coupling magnetic ring is magnetically coupled with the outer magnetic coupling magnetic ring; the lower end of the inner magnetic coupling flow tube is inserted into the convex ring of the combined flow through hole; a downward step is arranged on the outer wall of the inner magnetic coupling flow tube, and the step can be engaged with the convex ring.

8. An all-electrically driven downhole safety valve according to claim 7, characterized in that the gripper includes a gripper upper end cover, a wedge friction block, a gripper iron core, a gripper coil, a gripper armature, and a gripper lower end cover; the gripper iron core is installed on the outer pressure cylinder through screws, and the gripper coil is wound around the outer wall of the gripper iron core; the gripper upper end cover is arranged at the upper end of the gripper iron core, and the gripper lower end cover is arranged at the lower end of the gripper iron core; the gripper lower end cover is provided with a protrusion inside the gripper iron core, and the gripper lower end cover is provided with at least two grooves inside the gripper iron core; the gripper armature is installed on the protrusion of the gripper lower end cover, and one wedge friction block is installed in one groove; when the gripper armature moves upward, all the wedge friction blocks can be pushed out; at least one gripper is provided, and a contact switch is arranged on the gripper upper end cover of the uppermost gripper.

9. An all-electrically driven downhole safety valve according to claim 8, characterized in that a tubing upper joint is arranged at the upper end of the inner pressure cylinder of the slide rail, a tubing lower joint is arranged at the lower end of the valve joint, and a connector is arranged on the tubing upper joint; the connection includes a wire passing through hole and a wiring cap arranged at the lower end of the wire passing through hole; a wire routing groove is opened on the inner wall of the outer pressure cylinder. The control lines of the fiber optic magnetic field sensor, the pusher coil, the fiber optic stress and strain sensor, the gripper coil, and the fiber optic pressure sensor all pass through the wire routing groove and are connected to the wiring cap; the fiber optic magnetic field sensor, the fiber optic stress and strain sensor, and the fiber optic pressure sensor are downhole sensors.

10. A control system for an all-electrically driven downhole safety valve, characterized in that it includes a downhole sensor, a data acquisition module, a data demodulation module, a downhole information processing module, and a first controller; the data acquisition module is connected to the downhole sensor through an optical fiber, and the data demodulation module is connected to the data acquisition module through an optical fiber; the pressure information processing module is connected to the data demodulation module, the stress and strain information processing module is connected to the data demodulation module, the magnetic field information processing module is connected to the data demodulation module, the first controller is connected to the downhole information processing module, and the display module is connected to the first controller through a cable.

11. A control system for a fully electrically driven downhole safety valve according to claim 10, It is characterized in that A controller switching module is also provided between the first controller and the display module, and a second controller having the same structure and connection relationship as the first controller is also provided; The downhole sensors include optical fiber magnetic field sensors, optical fiber stress strain sensors, and optical fiber pressure sensors; The downhole information processing module includes a pressure information processing module, a stress-strain information processing module, and a magnetic field information processing module.

12. A control system for a fully electrically driven downhole safety valve according to claim 11, It is characterized in that The first controller includes a clamper monitoring module, a clamper power calculation module, a pusher power calculation module, a clamper power supply module, a controller state monitoring module, a pusher power supply module and a central processing unit module; The clamp monitoring module is developed based on a single chip microcomputer and is connected to the stress and strain information processing module; The clamping device power calculation module is developed based on DSP and is connected to the stress and strain information processing module; The thruster power calculation module is developed based on DSP and is connected to the pressure information processing module and the magnetic field information processing module respectively; The clamping device power supply module is developed based on the IGBT chip and is connected to the clamping device power calculation and clamping device monitoring modules; The thruster power supply module is developed based on the IGBT chip and is connected to the thruster motor calculation module; The controller state monitoring module is developed based on a single chip microcomputer and is connected to the clamp monitoring module, the clamp power calculation module, the pusher power calculation module, the clamp power supply module and the pusher power supply module; The central processing unit module is connected to the clamping device monitoring module, the clamping device power calculation module, the pusher power calculation module, the clamping device power supply module, the controller state monitoring module and the pusher power supply module through cables.

13. A method for using a fully electrically driven downhole safety valve. It is characterized in that The following steps are included: S1, when the valve needs to be opened, the downhole information processing module processes the information of the downhole sensor and transmits it to the first controller. Under the control of the first controller, the pusher coil is energized to push the magnetic slider downward, and the magnetic slider drives the outer magnetic coupling tube to move downward, compressing the spring. At the same time, due to the magnetic coupling effect, the inner magnetic coupling flow tube moves downward synchronously, pushing open the valve, and completing the opening; S2. After the valve is fully opened, the protruding ring on the upper end of the external magnetic coupling tube touches the contact switch, disconnecting the power supply of the pusher coil. At the same time, the clamping coil is energized, and the clamping device clamps the external magnetic coupling tube to maintain the open state of the valve. The downhole information processing module processes the information of the downhole sensor and transmits it to the first controller. The first controller adjusts the current of the pusher coil in real time. S3. When the valve needs to be closed, an operator on the well controls the central processing unit module to disconnect the power supply of the clamping device coil, and the clamping device releases the brake. Under the action of the spring, each structure is reset and the valve is closed.

14. A method for using a fully electrically driven downhole safety valve according to claim 13, It is characterized in that In S1, the pressure information processing module processes the pressure information of the fiber optic pressure sensor, calculates the current required for the actuator coil through the actuator power calculation module, controls the actuator coil to be alternately powered on by the actuator power supply module, and calculates and changes the current magnitude of the actuator coil in real time according to the magnetic field information collected by the fiber optic magnetic field sensor through the actuator power calculation module; In S2, the stress and strain information processing module processes the stress and strain information collected by the fiber optic stress and strain sensor, and transmits it to the gripper power calculation module and the gripper monitoring module simultaneously. The gripper power calculation module calculates and adjusts the current magnitude of the gripper coil in real time according to the stress and strain information. The gripper monitoring module judges the working state of the gripper according to the stress and strain information, and evaluates whether to switch to the second gripper to work or both grippers work simultaneously; Inside the first controller, the controller state monitoring module evaluates the working state of each module of the first controller in real time. After detecting an abnormal operation, it is sent to the controller switching module by the central processing unit module, and switches to the second controller to execute the control function. The operating state information of the all-electric driven downhole safety valve is displayed in real time on the display module.

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