An internal electric-hydraulic magnetic coupling type downhole safety valve and a use method thereof

Abstract

The present application relates to oil and gas exploitation downhole safety technical field, especially inbuilt electric hydraulic magnetic coupling type downhole safety valve and use method. The lower end of the safety valve shell main body is connected with the hydraulic control body, the inside is equipped with the center tube, the center of the hydraulic control body is equipped with the butterfly valve opening center tube, the outer wall of the butterfly valve opening center tube is installed driven magnetic block; The output end of the downhole micro electric hydraulic pump is moved through the hydraulic control pipeline to drive the magnetic coupling driver in the hydraulic control body, and then drives the active magnetic drive block to move down and drive the reset spring to compress, drives the driven magnetic block to move down, thereby pushing the butterfly valve opening center tube to move down and pushes away the butterfly valve plate to open; Its beneficial effect is: the present application provides independent hydraulic power through the built-in downhole micro electric hydraulic pump, magnetic coupling seal-free transmission, fast pressure relief of the fast pressure relief micro electromagnetic valve, spring energy storage reset optimization overall structure, reduces mechanical friction loss, prolongs the overall service life of the downhole safety valve.

Description

Technical Field

[0001] This invention relates to the field of downhole safety technology in oil and gas extraction, and in particular to a built-in electro-hydraulic magnetic coupling downhole safety valve and its usage method. Background Technology

[0002] Downhole safety valves are indispensable downhole safety control equipment in oil and gas extraction operations. Their main function is to quickly cut off the downhole fluid passage and avoid major safety accidents in emergencies such as abnormally high pressure in the wellbore, pipeline damage, and potential blowouts. Currently, downhole safety valves used in the market are mainly divided into two categories: external hydraulic control type and ordinary electric type. Among them, traditional hydraulic control downhole safety valves require laying hydraulic control pipelines from the surface to the wellbore. The pipelines are constantly immersed in high-mineralization and highly corrosive downhole media, which easily leads to problems such as rusting, aging, oil circuit blockage, and oil leakage at joints. The pipeline layout is difficult in deep wells and directional wells, and the workload of subsequent pipeline inspection, replacement and maintenance is large, resulting in high overall construction investment.

[0003] Conventional electrically driven downhole safety valves mostly employ a direct-drive transmission mechanism, with the motor penetrating the valve body. This necessitates multiple sets of moving dynamic seals. Under high-pressure, impurity-driven, and alternating high- and low-temperature environments downhole, these moving seals wear rapidly, and seal failure can easily lead to oil and gas leakage. Furthermore, existing electric valves lack dedicated rapid pressure relief structures, resulting in delayed emergency shut-off actions. High mechanical friction within the valve body's moving parts leads to rapid aging and damage over long-term operation, resulting in a short overall service life. Frequent tripping of production tubing is required to replace the safety valve, significantly increasing downhole operating costs. Therefore, existing technology suffers from drawbacks such as cumbersome piping structures, susceptibility to leaks, low shut-off efficiency, severe wear, short lifespan, and high maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned deficiencies in existing technologies by providing a built-in electro-hydraulic magnetically coupled downhole safety valve and its usage method. This valve utilizes a built-in downhole micro-electro-hydraulic pump to independently provide hydraulic power, magnetically coupled seal-free transmission, a rapid pressure relief micro-solenoid valve for quick pressure release, and a spring-energy-storage reset mechanism to optimize the overall structure. This reduces mechanical friction losses, extends the overall service life of the downhole safety valve, reduces the frequency of parts replacement and downhole tripping operations, and ultimately achieves cost reduction and efficiency improvement.

[0005] This invention discloses a built-in electro-hydraulic magnetically coupled downhole safety valve. The technical solution includes a safety valve housing, an upper connector, and a lower connector. It further includes a downhole micro-electro-hydraulic pump, a rapid-release micro-solenoid valve, a pressure sensor, a hydraulic control body, a magnetically coupled actuator, an active magnetic drive block, a driven magnetic block, a return spring, a butterfly valve opening center tube, a butterfly valve plate, a sealed oil tank, a hydraulic control line, and a center tube. The upper end of the safety valve housing is connected to the upper connector, and the lower end of the safety valve housing is connected to the hydraulic control body. The lower end of the hydraulic control body is connected to the lower connector. A center tube is located inside the safety valve housing, and a butterfly valve opening center tube is located at the center of the hydraulic control body. A driven magnetic block is installed on the outer wall of the butterfly valve opening center tube. A magnetic block is installed in the annulus between the safety valve housing and the central tube, housing a sealed oil tank and a downhole micro electric hydraulic pump. The pump moves the magnetically coupled actuator within the hydraulic control body via the hydraulic control line, a rapid-release micro solenoid valve, and a pressure sensor. This causes the active magnetic drive block to move downwards and compress the return spring. Simultaneously, under the magnetic coupling of the active magnetic drive block, the driven magnetic block moves downwards, thus pushing the butterfly valve opening central tube downwards. The lower end of the butterfly valve opening central tube opens the butterfly valve plate. A rapid-release micro solenoid valve is installed on the hydraulic control line. By controlling the rapid-release micro solenoid valve to release pressure, the return spring resets, the active magnetic drive block moves upwards, and the butterfly valve opening central tube moves upwards, closing the butterfly valve plate.

[0006] Preferably, the hydraulic control body has a hydraulic piston chamber in its side wall, a groove in its inner wall, a hydraulic control housing on its outer side, a magnetic coupling driver in the hydraulic piston chamber, and an active magnetic drive block moved downwards by the magnetic coupling driver. A return spring is installed at the lower part of the active magnetic drive block.

[0007] Preferably, the lower part of the outer wall of the butterfly valve opening center tube is provided with a limiting boss for installing a driven magnetic block, the magnetic pole of the driven magnetic block being opposite to the magnetic pole of the active magnetic drive block; and a sealed isolation cavity is formed between the outer wall of the butterfly valve opening center tube and the groove of the inner wall of the hydraulic control body.

[0008] Preferably, a sealing plug is installed between the lower end of the outer wall of the butterfly valve opening center tube and the lower end of the inner wall of the hydraulic control body, and the butterfly valve plate is installed on the lower side of the sealing plug.

[0009] Preferably, the magnetic coupling actuator described above uses a hydraulic piston.

[0010] Preferably, the annulus between the safety valve housing and the central pipe is further equipped with a downhole electrical control module and a sealed return oil tank, and the sealed return oil tank is connected to the sealed oil storage tank through a connecting pipe.

[0011] Preferably, the inlet end of the aforementioned rapid pressure relief miniature solenoid valve is connected to the hydraulic control line via a multi-port connector, and the outlet end of the rapid pressure relief miniature solenoid valve is connected to the sealed return oil tank via a return oil line.

[0012] Preferably, the signal acquisition end of the pressure sensor is connected to the hydraulic control line below the multi-port connector, the signal line is connected to the downhole electrical control module, and is transmitted to the surface via a cable passing through the upper connector.

[0013] The method of using the built-in electro-hydraulic magnetic coupling downhole safety valve mentioned in this invention includes the following process: I. Normal Production Start-up State: The surface control system issues a valve opening command, and the downhole electrical control module controls the start of the downhole micro electric hydraulic pump. Hydraulic oil enters the hydraulic piston chamber in the hydraulic control body through the hydraulic control line and is gradually pressurized. The oil pressure pushes the magnetic coupling actuator to compress the reset spring, and at the same time drives the active magnetic drive block to move downward. Under the magnetic coupling of the active magnetic drive block, the driven magnetic block follows and moves downward, thereby pushing the butterfly valve opening center tube downward. The lower end of the butterfly valve opening center tube pushes open the butterfly valve plate, and the fluid passage is fully connected. After that, the downhole micro electric hydraulic pump stops working, the rapid pressure relief micro solenoid valve is in the closed state, the hydraulic control line is sealed and pressure is maintained, and the fluid passage is kept fully open for a long time, which is the normal production start-up state. II. Normal Valve Closure Operation: When it is necessary to close the downhole passage, the surface control system sends a command, and the downhole electrical control module controls the rapid pressure relief miniature solenoid valve to open. The hydraulic oil inside the hydraulic piston chamber in the hydraulic control body flows back to the sealed return oil tank along the return oil line to achieve pressure relief. The pressure inside the hydraulic piston chamber drops rapidly, and the compressed return spring releases its elastic potential energy, pushing the active magnetic drive block to move upward in the opposite direction. Under the magnetic coupling effect of the active magnetic drive block, the driven magnetic block follows and moves upward, thereby pushing the butterfly valve opening center pipe to move upward, closing the butterfly valve plate, and blocking the fluid passage.

[0014] Preferably, the method of using the built-in electro-hydraulic magnetic coupling downhole safety valve mentioned in this invention also includes a fault emergency protection state: In the event of an emergency such as a power outage, disconnection of control signals, or abnormal wellbore pressure, the downhole electrical control module controls the opening of the rapid pressure relief micro solenoid valve. The hydraulic oil inside the hydraulic piston chamber of the hydraulic control body is depressurized, the reset spring is reset, and the active magnetic drive block is pushed upward, which in turn moves the driven magnetic block and the butterfly valve opening center tube upward, completing the passive valve closure, sealing the wellbore in time, and preventing a blowout safety accident.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses a built-in downhole micro electric hydraulic pump to provide hydraulic power, eliminating the need for external long-distance hydraulic pipelines, resulting in a simpler structure, avoiding common faults such as pipeline corrosion, blockage, and leakage, and making it more widely applicable in downhole environments. 2. This invention uses an active magnetic drive block and a driven magnetic block to achieve a contactless transmission structure. There is no valve body passing through the transmission shaft, eliminating the moving dynamic seal, preventing leakage of high-pressure media, reducing mechanical wear, and significantly extending the overall service life of the safety valve. 3. This invention is equipped with a rapid pressure relief miniature solenoid valve and a return spring. The rapid pressure relief miniature solenoid valve can achieve rapid pressure relief. Combined with the elastic force of the return spring, the active magnetic drive block moves upward, which in turn drives the driven magnetic block and the butterfly valve opening center tube to move upward, thereby achieving rapid closure of the butterfly valve plate. Its closing speed is fast. It can be remotely controlled from the ground and can also achieve automatic closure in case of power failure, thus realizing emergency safety protection downhole. 4. The invention has a compact overall structure, excellent butterfly valve flow performance, resistance to media erosion and scaling, low overall equipment failure rate, few vulnerable components, convenient operation and control, stable and reliable operation, extended service life of downhole safety valves, reduced replacement of parts and frequency of downhole tripping operations, achieving cost reduction and efficiency improvement, and can be widely used in downhole safety protection work under various working conditions such as high-pressure vertical wells, directional deviated wells, and offshore oil and gas wells. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the lower half of the present invention; Figure 3 This is a partial structural diagram of the upper part of the present invention; Figure 4 This is a schematic diagram of the control section of the present invention; In the diagram: 1. Safety valve housing; 2. Downhole miniature electric hydraulic pump; 3. Quick-release miniature solenoid valve; 4. Pressure sensor; 5. Hydraulic control unit; 6. Magnetic coupling actuator; 7. Active magnetic drive block; 8. Driven magnetic block; 9. Sealed isolation chamber; 10. Return spring; 11. Butterfly valve opening center tube; 12. Butterfly valve plate; 13. Sealed oil reservoir; 14. Downhole electrical control module; 15. Cable; 16. Hydraulic control line; 17. Upper connector; 18. Lower connector; 19. Center tube; 20. Sealed return oil tank; 21. Connecting pipe; 22. Multi-way connector; 3.1 Return oil line; 5.1 Hydraulic piston chamber; 5.2 Hydraulic control housing; 5.3 Groove; 5.4 Sealing plug; 11.1 Limiting boss. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] Example 1, referring to Figures 1-4 The present invention discloses a built-in electro-hydraulic magnetically coupled downhole safety valve, comprising a safety valve housing body 1, an upper connector 17, and a lower connector 18. It further includes a downhole micro-electro-hydraulic pump 2, a rapid pressure relief micro-solenoid valve 3, a pressure sensor 4, a hydraulic control body 5, a magnetically coupled actuator 6, an active magnetic drive block 7, a driven magnetic block 8, a return spring 10, a butterfly valve opening center tube 11, a butterfly valve plate 12, a sealed oil tank 13, a hydraulic control line 16, and a center tube 19. The upper end of the safety valve housing body 1 is connected to the upper connector 17, and the lower end of the safety valve housing body 1 is connected to the hydraulic control body 5. The lower end of the hydraulic control body 5 is connected to the lower connector 18. A center tube 19 is provided inside the safety valve housing body 1, and the center of the hydraulic control body 5 has a butterfly valve opening center tube 11. A driven magnetic drive block is installed on the outer wall of the butterfly valve opening center tube 11. Block 8; A sealed oil storage tank 13 and a downhole micro electric hydraulic pump 2 are installed in the annulus between the safety valve housing body 1 and the central tube 19. The magnetic coupling actuator 6 in the hydraulic control body 5 is moved through the hydraulic control line 16, the rapid pressure relief micro solenoid valve 3 and the pressure sensor 4, which in turn drives the active magnetic drive block 7 to move down and push the return spring 10 to compress. At the same time, under the magnetic coupling action of the active magnetic drive block 7, the driven magnetic block 8 is driven to move down, thereby pushing the butterfly valve opening central tube 11 to move down. The lower end of the butterfly valve opening central tube 11 pushes open the butterfly valve plate 12. A rapid pressure relief micro solenoid valve 3 is installed on the hydraulic control line 16. By controlling the rapid pressure relief micro solenoid valve 3 to release pressure, the return spring 10 is reset, the active magnetic drive block 7 moves up, and then drives the butterfly valve opening central tube 11 to move up, so that the butterfly valve plate 12 is closed.

[0019] The hydraulic control body 5 has a hydraulic piston chamber 5.1 in its side wall and a groove 5.3 in its inner wall. A hydraulic control housing 5.2 is installed on the outside of the hydraulic control body 5. A magnetic coupling driver 6 is installed in the hydraulic piston chamber 5.1. The magnetic coupling driver 6 drives the active magnetic drive block 7 to move downward. A reset spring 10 is installed at the lower part of the active magnetic drive block 7.

[0020] Reference Figure 2 The lower part of the outer wall of the butterfly valve opening center tube 11 mentioned in this invention is provided with a limiting boss 11.1 for installing a driven magnetic block 8. The magnetic pole of the driven magnetic block 8 is opposite to the magnetic pole of the active magnetic drive block 7. A sealed isolation cavity 9 is formed between the outer wall of the butterfly valve opening center tube 11 and the groove 5.3 of the inner wall of the hydraulic control body 5.

[0021] In this configuration, a sealing plug 5.4 is installed between the lower end of the outer wall of the butterfly valve opening center tube 11 and the lower end of the inner wall of the hydraulic control body 5, and the butterfly valve plate 12 is installed on the lower side of the sealing plug 5.4.

[0022] The aforementioned magnetic coupling actuator 6 employs a hydraulic piston.

[0023] The annulus between the safety valve housing 1 and the central pipe 19 is also equipped with a downhole electrical control module 14 and a sealed return oil tank 20. The sealed return oil tank 20 is connected to the sealed oil storage tank 13 through a connecting pipe 21.

[0024] The inlet of the aforementioned quick-release miniature solenoid valve 3 is connected to the hydraulic control line 16 via a multi-port connector 22, and the outlet of the quick-release miniature solenoid valve 3 is connected to the sealed return oil tank 20 via the return oil line 3.1.

[0025] The signal acquisition end of the pressure sensor 4 is connected to the hydraulic control line 16 below the multi-port connector 22, the signal line is connected to the downhole electrical control module 14, and is sent to the surface through the upper connector 17 via the cable 15.

[0026] The method of using the built-in electro-hydraulic magnetic coupling downhole safety valve mentioned in this invention includes the following process: I. Normal Production Start-up State: The ground control system issues a valve opening command, and the downhole electrical control module 14 controls the start of the downhole micro electric hydraulic pump 2. The hydraulic oil enters the hydraulic piston chamber 5.1 in the hydraulic control body 5 through the hydraulic control line 16 and is gradually pressurized. The oil pressure pushes the magnetic coupling driver 6 to compress the reset spring 10, and at the same time drives the active magnetic drive block 7 to move downward. Under the magnetic coupling action of the active magnetic drive block 7, the driven magnetic block 8 follows and moves downward, thereby pushing the butterfly valve opening center pipe 11 to move downward. The lower end of the butterfly valve opening center pipe 11 pushes open the butterfly valve plate 12, and the fluid passage is fully connected. After that, the downhole micro electric hydraulic pump 2 stops working, the rapid pressure relief micro solenoid valve 3 is in the closed state, the hydraulic control line 16 is sealed and pressure is maintained, and the fluid passage is kept fully open for a long time, which is the normal production start-up state. II. Normal valve closing operation: When it is necessary to close the downhole passage, the surface control system sends a command, and the downhole electrical control module 14 controls the rapid pressure relief micro solenoid valve 3 to open. The hydraulic oil inside the hydraulic piston chamber 5.1 in the hydraulic control body 5 flows back to the sealed return oil tank 20 along the return oil line 3.1 to achieve pressure relief. The pressure inside the hydraulic piston chamber 5.1 drops rapidly, and the compressed return spring 10 releases its elastic potential energy, pushing the active magnetic drive block 7 to move upward. Under the magnetic coupling of the active magnetic drive block 7, the driven magnetic block 8 moves upward, thereby pushing the butterfly valve opening center pipe 11 to move upward, and the butterfly valve plate 12 closes, blocking the fluid passage. 3. In case of emergency such as power failure, disconnection of control signal, or abnormal wellbore pressure in the well: the downhole electrical control module 14 controls the opening of the rapid pressure relief micro solenoid valve 3, the hydraulic oil inside the hydraulic piston chamber 5.1 in the hydraulic control body 5 is depressurized, the reset spring 10 is reset, and the active magnetic drive block 7 is pushed upward, which drives the driven magnetic block 8 and the butterfly valve opening center pipe 11 to move upward, completing the passive valve closure, sealing the wellbore in time, and preventing a blowout safety accident.

[0027] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A built-in electro-hydraulic magnetic coupling downhole safety valve, comprising a safety valve housing body (1), an upper connector (17), and a lower connector (18), characterized in that: It also includes a downhole micro electric hydraulic pump (2), a rapid pressure relief micro solenoid valve (3), a pressure sensor (4), a hydraulic control body (5), a magnetic coupling driver (6), an active magnetic drive block (7), a driven magnetic block (8), a return spring (10), a butterfly valve opening center tube (11), a butterfly valve plate (12), a sealed oil tank (13), a hydraulic control line (16), and a center tube (19). The upper end of the safety valve housing body (1) is connected to an upper connector (17), and the lower end of the safety valve housing body (1) is connected to the hydraulic control body (5). The lower end of the hydraulic control body (5) is connected to a lower connector (18). A center tube (19) is provided inside the safety valve housing body (1). A butterfly valve opening center tube (11) is provided in the center of the hydraulic control body (5). A driven magnetic block (8) is installed on the outer wall of the butterfly valve opening center tube (11). The safety valve housing body (1) and the center tube (19) A sealed oil tank (13) and a downhole micro electric hydraulic pump (2) are installed in the annulus between the two. The magnetic coupling actuator (6) in the hydraulic control body (5) is moved through the hydraulic control line (16), the fast pressure relief micro solenoid valve (3) and the pressure sensor (4), which in turn drives the active magnetic drive block (7) to move down and pushes the return spring (10) to compress. At the same time, under the magnetic coupling of the active magnetic drive block (7), the driven magnetic block (8) is driven to move down, thereby pushing the butterfly valve opening center tube (11) to move down. The lower end of the butterfly valve opening center tube (11) pushes open the butterfly valve plate (12). A fast pressure relief micro solenoid valve (3) is installed on the hydraulic control line (16). By controlling the fast pressure relief micro solenoid valve (3) to release pressure, the return spring (10) is reset, the active magnetic drive block (7) moves up, and then drives the butterfly valve opening center tube (11) to move up so that the butterfly valve plate (12) is closed.

2. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 1, characterized in that: The hydraulic control body (5) has a hydraulic piston chamber (5.1) in the side wall and a groove (5.3) in the inner wall. A hydraulic control housing (5.2) is installed on the outside of the hydraulic control body (5). A magnetic coupling driver (6) is installed in the hydraulic piston chamber (5.1). The magnetic coupling driver (6) drives the active magnetic drive block (7) to move downward. A reset spring (10) is installed at the lower part of the active magnetic drive block (7).

3. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 2, characterized in that: The lower part of the outer wall of the butterfly valve opening center tube (11) is provided with a limiting boss (11.1) for installing a driven magnetic block (8). The magnetic pole of the driven magnetic block (8) is opposite to the magnetic pole of the active magnetic drive block (7). A sealed isolation cavity (9) is formed between the outer wall of the butterfly valve opening center tube (11) and the groove (5.3) of the inner wall of the hydraulic control body (5).

4. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 3, characterized in that: A sealing plug (5.4) is installed between the lower end of the outer wall of the butterfly valve opening center tube (11) and the lower end of the inner wall of the hydraulic control body (5), and the butterfly valve plate (12) is installed on the lower side of the sealing plug (5.4).

5. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 4, characterized in that: The magnetic coupling actuator (6) described herein employs a hydraulic piston.

6. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 5, characterized in that: The annulus between the safety valve housing body (1) and the central pipe (19) is also equipped with a downhole electrical control module (14) and a sealed return oil tank (20), and the sealed return oil tank (20) and the sealed oil storage tank (13) are connected by a connecting pipe (21).

7. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 6, characterized in that: The inlet end of the rapid pressure relief micro solenoid valve (3) is connected to the hydraulic control line (16) through a multi-port connector (22), and the outlet end of the rapid pressure relief micro solenoid valve (3) is connected to the sealed return oil tank (20) through the return oil line (3.1).

8. The built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 7, characterized in that: The signal acquisition end of the pressure sensor (4) is connected to the hydraulic control line (16) below the multi-port connector (22), the signal line is connected to the downhole electrical control module (14), and is sent to the surface through the upper connector (17) via the cable (15).

9. A method of using the built-in electro-hydraulic magnetic coupling downhole safety valve as described in claim 8, characterized in that: The process includes the following:

1. Normal production start-up state: The ground control system issues a valve opening command, and the downhole electrical control module (14) controls the start of the downhole micro electric hydraulic pump (2). The hydraulic oil enters the hydraulic piston chamber (5.1) in the hydraulic control body (5) through the hydraulic control line (16) and gradually increases the pressure. The oil pressure pushes the magnetic coupling driver (6) to compress the reset spring (10), and at the same time drives the active magnetic drive block (7) to move downward. Under the magnetic coupling action of the active magnetic drive block (7), the driven magnetic block (8) moves downward, thereby pushing the butterfly valve opening center pipe (11) to move downward. The lower end of the butterfly valve opening center pipe (11) pushes open the butterfly valve plate (12) to open, and the fluid channel is fully connected. After that, the downhole micro electric hydraulic pump (2) stops working, the rapid pressure relief micro solenoid valve (3) is in the closed state, the hydraulic control line (16) is sealed and pressure is maintained, and the fluid channel is kept fully open for a long time, which is the normal production start-up state.

2. Normal valve closing operation: When it is necessary to close the downhole passage, the surface control system sends a command, and the downhole electrical control module (14) controls the rapid pressure relief micro solenoid valve (3) to open. The hydraulic oil inside the hydraulic piston chamber (5.1) in the hydraulic control body (5) flows back to the sealed return oil tank (20) along the return oil line (3.1) to achieve pressure relief. The pressure inside the hydraulic piston chamber (5.1) drops rapidly, and the compressed reset spring (10) releases elastic potential energy, pushing the active magnetic drive block (7) to move upward. Under the magnetic coupling of the active magnetic drive block (7), the driven magnetic block (8) moves upward, thereby pushing the butterfly valve opening center pipe (11) to move upward, and the butterfly valve plate (12) closes, blocking the fluid passage.

10. The method of using the built-in electro-hydraulic magnetic coupling downhole safety valve according to claim 9, characterized in that: It also includes fault emergency protection status: In the event of an emergency such as power failure, disconnection of control signal, or abnormal wellbore pressure in the well, the downhole electrical control module (14) controls the opening of the rapid pressure relief micro solenoid valve (3), the hydraulic oil inside the hydraulic piston chamber (5.1) in the hydraulic control body (5) is depressurized, the reset spring (10) is reset, and the active magnetic drive block (7) is pushed to move upward, which in turn drives the driven magnetic block (8) and the butterfly valve opening center pipe (11) to move upward, thus completing the passive valve closure, timely sealing of the wellbore, and preventing a blowout safety accident.

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