An easy-to-maintain electronically controlled downhole safety valve

Abstract

The present invention relates to an easy-to-maintain electrically controlled downhole safety valve, which consists of a drive module, a side-disassembly sealing module, an intelligent monitoring module, an external connection module and a sealing module. The drive module includes a motor, a power battery and a dual-power conversion controller, etc.; the side-disassembly sealing module includes a valve plate, a torsion spring and a pin, etc.; the intelligent monitoring module includes a flow rate, a pressure sensing element and a signal converter, etc.; the external connection module includes an upper outer tube, a lower outer tube and a cover plate, etc.; the sealing module includes seals at each joint. The beneficial effects of the present invention are that the side-disassembly sealing module can be taken out or installed from the side, which is convenient for maintenance and replacement of vulnerable parts such as valve plates and torsion springs; a motor is used to drive the inner tube of the sliding sleeve to open and close the valve plate, which responds quickly; the intelligent monitoring module contains a variety of sensing elements, which can provide real-time downhole conditions and provide timely reference for ground operations; a dual-power conversion controller is used, which can automatically switch the power supply to close the valve in emergency situations such as cable damage.

Description

Technical Field

[0001] The present invention relates to the field of intelligent equipment for oil and natural gas exploitation and gas storage injection and production, and in particular to an easy-to-maintain electrically controlled downhole safety valve. Background Art

[0002] Downhole safety valves are safety devices widely used in oil and gas well and gas storage completion systems. Their primary function is to protect the integrity of the wellbore and the surrounding environment. When wellhead pressure is excessive, downhole safety valves quickly close internal valves, preventing the uncontrolled release of oil and gas from the wellhead, thus preventing blowouts and even serious accidents such as casualties. Downhole safety valves can also close to protect the wellbore from damage when external factors such as excessive pressure, formation fractures, or severe wear on the wellbore occur. Once closed, downhole safety valves prevent oil and gas leaks and environmental contamination, protecting the ecological environment. Overall, downhole safety valves are crucial devices for ensuring the safety of oil and gas wells and the environment, playing a vital role. There are many types of downhole safety valves, which can be categorized by actuation method, such as hydraulic control and electric-controlled magnetic coupling. Hydraulic control is the most representative. Currently, there are downhole safety valve devices available for field use, but they still present several challenges in terms of functionality and efficiency, primarily the following:

[0003] (1) Most of the existing safety valve closing devices are hydraulically driven or electromagnetically driven. Hydraulic drives are expensive, difficult to maintain, have limited insertion depth, generate high noise and vibration during operation, and are prone to contamination and leakage of hydraulic oil. Electromagnetic drives are usually equipped with more mechanical and electronic components, so they are bulky, have high energy consumption, high noise, and poor reliability.

[0004] (2) All the components of existing safety valves are installed and matched from the inside out. When the safety valve is taken out for inspection and maintenance of the valve and other core components, all the components must be disassembled from the outside in before the valve can be inspected or replaced. After the inspection is completed, they must be installed and matched from the inside out again, which makes the inspection process cumbersome and lengthy, increases the difficulty of assembly, and may reduce the reliability of the safety valve after assembly;

[0005] (3) The existing safety valve device has a low level of integration in terms of monitoring devices. The installation locations of various sensing elements are scattered. When inspecting or replacing a sensing element, a large number of structures need to be disassembled. The process of replacing the sensing element is time-consuming and requires sophisticated operations.

[0006] (4) In an emergency situation after the power cable fails, most existing safety valve devices rely on mechanical external forces such as springs to close the valve. However, the stability and reliability of this mechanical external force in closing the valve are generally poor, and it cannot guarantee that the valve can be reliably closed in an emergency situation.

[0007] In order to effectively solve the shortcomings of existing safety valves, it is urgent to invent an easy-to-maintain electronically controlled downhole safety valve to solve several problems of existing safety valves during use, so as to realize the simple, efficient, safe and stable operation of the safety valve downhole. Summary of the Invention

[0008] In order to solve the above problems, the present invention provides an easy-to-maintain electrically controlled downhole safety valve, which is provided with a drive module, which includes a power battery, a motor, a dual power conversion controller, a screw, a coupling and a sleeve inner tube, etc. The motor is powered by a cable, and the dual power conversion controller controls the speed and direction of the motor, thereby driving the rotation of the screw so that the sleeve inner tube can move up and down, and finally realizing the opening and closing of the valve plate, solving the problems of high cost, difficult maintenance, high noise and vibration during operation, easy contamination and leakage of hydraulic oil, and large size of electromagnetic drive, high energy consumption, high noise, and poor reliability; the present invention is provided with a side-removable plugging module, which includes a valve plate, a side-removable valve plate seat, a torsion spring and a pin shaft, etc. The side-removable plugging module can remove the valve plate, torsion spring and other core components as a whole from the side for maintenance or replacement, solving the problem that when the traditional safety valve device is repaired and overhauled on the core components such as the internal valve, all components must be disassembled from the outside to the inside before the core components such as the valve can be repaired or replaced, and after the maintenance is completed, it must be removed from the outside to the inside. The inside-outside installation and matching lead to a cumbersome and lengthy maintenance process, increased assembly difficulty, and the possibility of reduced reliability of the assembled safety valve. The present invention is provided with an intelligent monitoring module, which includes a flow sensing element, a gas sensing element, a temperature sensing element, a pressure sensing element and a signal converter. The four types of sensing elements are integrated and installed on the side of the safety valve, realizing real-time, accurate and comprehensive monitoring of the downhole environment. In addition, different types of sensing elements can be selected to replace the above four sensing elements according to the actual situation that needs to be monitored on site to achieve personalized customized monitoring, solving the problems of scattered installation positions of sensing elements of traditional safety valve devices, insufficient installation types and time-consuming and cumbersome replacement processes. The present invention is provided with a dual power conversion controller and a power battery. When the cable is damaged during operation and cannot provide power for the motor, the dual power conversion controller can switch the power battery as the power source of the motor to drive the motor to close the valve, solving the problem that the traditional safety valve only relies on mechanical external forces such as springs to close the valve in emergency situations such as cable damage.

[0009] The patent of the present invention solves its technical problems by adopting the following technical solutions: an easy-to-maintain electrically controlled downhole safety valve, which consists of a drive module, a side-dismantling plugging module, an intelligent monitoring module, an external connection module and a sealing module; the drive module includes a motor, a cable, a power battery, a dual-power conversion controller, a screw, a screw sealing sleeve, a sliding sleeve inner tube, a reset spring and a coupling, wherein the power battery is installed in the battery compartment of the upper outer tube, the dual-power conversion controller and the motor are installed in the motor compartment of the upper outer tube, the screw is connected to the motor through a coupling, the screw sealing sleeve seals the interface between the screw and the motor compartment, the sliding sleeve inner tube is installed in the upper outer tube, and the screw The rod is connected to the threaded hole III of the inner tube of the sliding sleeve, the reset spring is sleeved on the inner tube of the sliding sleeve and installed between the inner tube of the sliding sleeve and the lower outer tube, the cable is connected to the ground platform from the cable channel II and can provide power for the motor and the signal converter, the dual power conversion controller controls the direction and speed of the motor, the forward rotation of the motor drives the screw to rotate forward, the forward rotation of the screw causes the inner tube of the sliding sleeve to move downward, the lower end of the inner tube of the sliding sleeve supports the valve plate under the action of the torsion spring, at this time the reset spring is compressed, when the motor reverses, it drives the screw to reverse, the reverse rotation of the screw causes the inner tube of the sliding sleeve to move upward, the lower end of the inner tube of the sliding sleeve loses the thrust on the valve plate, and the valve plate under the action of the torsion spring is closed; side disassembly plugging module It includes a valve plate, a side-dismantling valve plate seat, a torsion spring, a pin and a bolt I, wherein the torsion spring and the valve plate are installed on the side-dismantling valve plate seat through the pin, the sealing ring I is installed in the sealing ring groove I, and the bolt I fixes the side-dismantling valve plate seat in the rectangular annulus of the lower outer tube; the intelligent monitoring module includes a flow sensing element, a gas sensing element, a temperature sensing element, a pressure sensing element and a signal converter, wherein the flow sensing element, the gas sensing element, the temperature sensing element and the pressure sensing element are all installed in the upper outer tube through threaded connection and sealed with a cover plate, and the signal converter is installed in the signal converter compartment of the upper outer tube; the external connection module includes an upper outer tube, a lower outer tube, and an upper joint , lower joint, cover plate and bolt Ⅱ, wherein the upper outer tube and the lower outer tube are connected by threads, the upper joint is installed on the upper end of the upper outer tube by threaded connection, the lower joint is installed on the lower end of the lower outer tube by threaded connection, the cover plate is embedded in the side of the upper outer tube and fixed to the side of the upper outer tube with bolt Ⅱ; the sealing module includes sealing ring Ⅰ, sealing gasket Ⅰ, sealing gasket Ⅱ, sealing gasket Ⅲ and sealing ring Ⅱ, sealing ring Ⅰ is installed in sealing ring groove Ⅰ, sealing gasket Ⅰ is installed between the lower joint and the lower outer tube, sealing gasket Ⅱ is installed between the lower outer tube and the upper outer tube, sealing gasket Ⅲ is installed between the upper outer tube and the upper joint, and sealing ring Ⅱ is installed in sealing ring groove Ⅱ.

[0010] The upper outer tube is provided with a sealing cover compartment, a cable channel I, a motor compartment, an internal thread I, an axial semi-cylinder, an internal thread II, a rectangular groove, a threaded sensing element compartment I, a threaded sensing element compartment II, a threaded sensing element compartment III, a threaded sensing element compartment IV, an internal thread III, four threaded holes V, a battery compartment, a signal converter compartment and a cable channel II. The sealing cover compartment is used to install the sealing cover. The cable channel I is a wire channel for the signal converter, the dual power conversion controller and the power battery. The battery compartment is used to install the power battery. The signal converter compartment is used to install the signal converter. The cable channel II is a cable channel. The upper joint and the sealing gasket III are installed on the upper end of the upper outer tube through threaded connection and the power battery is sealed in the battery compartment.

[0011] The inner tube of the sliding sleeve is provided with a threaded hole III and three semicircular holes. The threaded hole III is used to connect with the screw. The three semicircular holes and the three axial semi-cylinders in the upper outer tube cooperate to fix the inner tube of the sliding sleeve circumferentially.

[0012] The lower outer tube is provided with an external thread II, a rectangular annulus, a special-shaped cavity, an internal thread IV and 8 threaded holes II. The external thread II and the internal thread II are connected. The rectangular annulus passes through the lower outer tube from the side. The rectangular annulus is used to install the side disassembly and plugging module and is fixed with 8 bolts II. The special-shaped cavity provides movement space for the opening and closing actions of the valve plate. The internal thread IV is used to install the lower joint, and the 8 threaded holes II are used to install 8 bolts II.

[0013] The side-detachable valve plate seat is provided with 8 through holes I, a valve plate cavity, a threaded hole IV, and a sealing ring groove I. The through hole I is aligned with the threaded hole II and is used to install the bolt II. The valve plate cavity is used to accommodate the valve plate when the valve plate is opened. The threaded hole IV is used to install the pin shaft, and the sealing ring groove I is used to install the sealing ring I.

[0014] The upper joint is provided with an external thread I and a male buckle end. The external thread I is connected to the internal thread III of the upper outer pipe, and the male buckle end is used to be connected to the female buckle end of the upper pipe column.

[0015] The lower joint is provided with an external thread III and a female buckle end. The external thread III is connected to the internal thread IV of the lower outer pipe, and the female buckle end is used to be connected to the male buckle end of the lower pipe column.

[0016] The cover plate is provided with four through holes II, a convex edge and a sealing ring groove II. The sealing ring groove II is used to install the sealing ring II. The convex edge is embedded in the rectangular groove of the upper outer tube. The through hole II and the threaded hole V are aligned and the bolt II is installed to fix the cover plate on the upper outer tube.

[0017] The intelligent monitoring module includes a flow sensing element, a gas sensing element, a temperature sensing element, a pressure sensing element and a signal converter. The flow sensing element is used to monitor the fluid flow rate, the gas sensing element is used to monitor the toxic gas content, the temperature sensing element is used to monitor the downhole temperature, and the pressure sensing element is used to monitor the downhole pressure. The signal converter transmits the monitored data to the ground monitoring station in real time via a cable.

[0018] The present invention has the following beneficial effects:

[0019] (1) The driving mode of the safety valve is set to motor drive, and the motor is powered by a cable connected to the ground platform. The structure is compact, no complicated supporting facilities are required, the lowering depth is not limited, and the driving response time is short and the reliability is high. This shortens the response time of the safety valve seal in an emergency and saves time for subsequent work;

[0020] (2) The core components such as the valve plate and valve seat are integrated into a side-dismantling plugging module, which is set to a side-access mode, which reduces the difficulty of disassembly and assembly, saves assembly time, and facilitates workers to perform daily maintenance, inspection, and replacement of wearing parts of the core components of the safety valve;

[0021] (3) Multiple sensing elements are integrated and installed on the side of the safety valve, which can monitor the downhole working conditions in real time, accurately and comprehensively. The replacement of sensing elements is more convenient. At the same time, the installation of sensing elements in various combinations is provided. Different types of sensing elements can be selected and installed according to the actual working conditions on site, realizing personalized customized monitoring and strong adaptability.

[0022] (4) The controller is set as a dual power conversion controller and a power battery is installed. When the cable is damaged and cannot drive the motor, the dual power conversion controller automatically switches to use the power battery as the power source to drive the motor, thereby achieving reliable control of the safety valve in an emergency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a full cross-sectional schematic diagram of the present invention;

[0024] Figure 2 This is a three-dimensional schematic diagram of the upper outer tube of the present invention;

[0025] Figure 3 This is a three-dimensional schematic diagram of the inner tube of the sliding sleeve of the present invention;

[0026] Figure 4 This is a three-dimensional schematic diagram of the lower outer tube of the present invention;

[0027] Figure 5 This is a three-dimensional schematic diagram of the side-disassembled valve plate seat of the present invention;

[0028] Figure 6 This is a three-dimensional schematic diagram of the upper joint of the present invention;

[0029] Figure 7 This is a three-dimensional schematic diagram of the lower joint of the present invention;

[0030] Figure 8 A three-dimensional schematic diagram of the cover plate of the present invention;

[0031] Figure 9 A three-dimensional schematic diagram of the battery of the present invention;

[0032] Figure 10 A three-dimensional schematic diagram of a signal converter according to the present invention;

[0033] Figure 11 This is a three-dimensional schematic diagram of the side removal and blocking module of the present invention;

[0034] Figure 12 is a three-dimensional schematic diagram of the assembly of the present invention;

[0035] Figure 13 This is a three-dimensional schematic diagram of the installation process of the side removal and blocking module of the present invention.

[0036] In the figure, 1-upper connector, 101-external thread I, 102-male thread end; 2-sealing cover; 3-dual power conversion controller; 4-motor; 5-screw; 6-screw sealing sleeve; 7-reset spring; 8-upper outer tube, 801-sealing cover compartment, 802-cable channel I, 803-motor compartment, 804-internal thread I, 805-axial semi-cylinder, 806-internal thread II, 807-rectangular groove, 808-threaded Sensing element compartment I, 809-threaded sensing element compartment II, 8010-threaded sensing element compartment III, 8011-threaded sensing element compartment IV, 8012-internal thread III, 8013-threaded hole V, 8014-battery compartment, 8015-signal converter compartment, 8016-cable channel II; 9-lower outer tube, 901-external thread II, 902-rectangular annulus, 903-special-shaped cavity, 904-internal thread IV, 905-threaded hole II; 10-pin; 11-torsion spring; 12-valve plate; 13-side-dismantling valve plate seat, 1301-through hole I, 1302-valve plate cavity, 1303-threaded hole IV, 1304-sealing ring groove I; 14-lower connector, 1401-external thread III, 1402-female buckle end; 15-sliding sleeve inner tube, 1501-threaded hole III, 1502-semicircular hole; 16-cover plate, 1601-through hole II, 1602-convex edge, 1603-sealing ring groove II; 17-flow sensing element; 18-gas sensing element; 19-temperature sensing element; 20-pressure sensing element; 21-bolt I; 22-coupling; 23-bolt II; 24-sealing ring I; 25-sealing gasket I; 26-sealing gasket II; 27-sealing gasket III; 28-sealing ring II; 29-cable; 30-power battery; 31-signal converter. DETAILED DESCRIPTION

[0037] The present invention relates to an easy-to-maintain electric-controlled downhole safety valve, which is composed of a drive module, a side-disassembly and plugging module, an intelligent monitoring module, an external connection module and a sealing module; the drive module includes a motor 4, a power battery 30, a dual-power conversion controller 3, a screw 5, a screw sealing sleeve 6, a sliding sleeve inner tube 15, a return spring 7 and a coupling 22, wherein the power battery 30 is installed in the battery compartment 8014 of the upper outer tube 8, the dual-power conversion controller 3 and the motor 4 are installed in the motor compartment 803 of the upper outer tube 8, the coupling 22 connects the screw 5 and the motor 4, and the screw sealing sleeve 6 is installed on the internal thread I 804 at the interface between the screw 5 and the motor compartment 803 Sealing, the sleeve inner tube 15 is installed in the upper outer tube 8, the screw 5 is connected to the threaded hole III1501 of the sleeve inner tube 15, the reset spring 7 is sleeved on the sleeve inner tube 15 and installed between the sleeve inner tube 15 and the lower outer tube 9; the side disassembly plugging module includes a valve plate 12, a side disassembly valve plate seat 13, a torsion spring 11, a pin 10 and a bolt I21, wherein the torsion spring 11 and the valve plate 12 are installed on the side disassembly valve plate seat 13 through the pin 10, and the bolt I21 fixes the side disassembly valve plate seat 13 in the rectangular annulus 902 of the lower outer tube 9; the intelligent monitoring module includes a flow sensing element 17, a gas sensing element 18, a temperature sensing element 19, a pressure sensing element 20 and a signal conversion The device 31 includes a flow sensor element 17 installed in a threaded sensor element compartment I 808, a gas sensor element 18 installed in a threaded sensor element compartment II 809, a temperature sensor element 19 installed in a threaded sensor element compartment III 8010, a pressure sensor element 20 installed in a threaded sensor element compartment IV 8011, and a signal converter 31 installed in a signal converter compartment 8015; the external connection module includes an upper outer tube 8, a lower outer tube 9, an upper joint 1, a lower joint 14, a cover plate 16 and a bolt II 23, wherein the upper outer tube 8 and the lower outer tube 9 are connected by threads, and the cover plate 16 is embedded in the side of the upper outer tube 8 and fixed with bolts II 23 Fix the side of the upper outer tube 8, the upper joint 1 is installed on the upper end of the upper outer tube 8 through a threaded connection, and the lower joint 14 is installed on the lower end of the lower outer tube 9 through a threaded connection; the sealing module includes a sealing ring I24, a sealing gasket I25, a sealing gasket II26, a sealing gasket III27 and a sealing ring II28, the sealing ring I24 is installed in the sealing ring groove I1304 of the side-disassembly valve plate seat 13, the sealing gasket I25 is installed between the lower joint 14 and the lower outer tube 9, the sealing gasket II26 is installed between the lower outer tube 9 and the upper outer tube 8, the sealing gasket III27 is installed between the upper outer tube 8 and the upper joint 1, and the sealing ring II28 is installed in the sealing ring groove II1603 of the cover plate 16.

[0038] The present invention works as follows:

[0039] During normal operation, the ground monitoring station sends an instruction to open the valve plate. After receiving the instruction from the ground monitoring station, the dual power conversion controller controls the motor to rotate forward. The forward rotation of the motor drives the coupling and the screw to rotate forward. Since the screw and the inner tube of the sliding sleeve are threadedly connected, and the circumferential rotation of the inner tube of the sliding sleeve is fixed, the inner tube of the sliding sleeve can only move downward along the inner wall of the upper outer tube. The inner tube of the sliding sleeve moves downward slowly and compresses the reset spring. The lower end of the inner tube of the sliding sleeve opens the valve plate under the action of the torsion spring. When the reset spring is fully compressed, the lower end of the inner tube of the sliding sleeve just completely opens the valve plate. At this time, the valve plate and the side-disassembly valve plate seat are parallel. When a well kick or blowout occurs underground, the intelligent monitoring module detects the abnormal underground working condition and transmits the signal to the ground monitoring station through the signal converter. The staff of the ground detection station issues a valve closing order. The dual power conversion controller receives the instruction from the ground test bench and controls the motor to rotate in the opposite direction. The reverse rotation of the motor drives the coupling and the screw to rotate in the opposite direction. Since the screw and the inner tube of the sleeve are threadedly connected and the circumferential rotation of the inner tube of the sleeve is fixed, the inner tube of the sleeve can only move upward along the inner wall of the upper outer tube. The inner tube of the sleeve moves upward slowly and the reset spring slowly returns to its original state. The lower end of the inner tube of the sleeve slowly leaves the valve plate, and the valve plate is closed under the action of the torsion spring. When the reset spring is fully reset, the lower end of the inner tube of the sleeve just completely leaves the valve plate. At this time, the valve plate and the side-disassembly valve plate seat are perpendicular; when the cable is damaged and cannot supply power to the motor and the intelligent monitoring module, it is necessary to close the safety valve for subsequent maintenance work. The dual power conversion controller automatically switches the power battery to supply power to the motor to close the valve.

[0040] The valve plate, side-dismantling valve plate seat, torsion spring and pin shaft are assembled into a side-dismantling plugging module and fixed to the lower outer tube with 8 bolts I. When the safety valve needs maintenance and inspection during the production process, first rotate the valve plate to a position parallel to the side-dismantling valve plate seat, then remove the 8 bolts I, push the side-dismantling plugging module out of the rectangular cavity of the lower outer tube, and inspect or replace key components such as the valve plate, torsion spring and sealing ring as needed; after the replacement is completed, push the side-dismantling plugging module into the rectangular cavity of the lower outer tube and fix it in the rectangular cavity of the lower outer tube with 8 bolts I.

[0041] The intelligent monitoring module provides locations for installing four types of sensing elements. Different types of sensing elements can be selected and installed according to the actual working conditions on site, such as pressure sensing elements, temperature sensing elements, flow sensing elements, displacement sensing elements, liquid level sensing elements, and gas sensing elements. Sensing elements in different combinations can be installed to achieve personalized monitoring of different working conditions.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that this patent can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An easy-to-maintain electric-controlled downhole safety valve, the safety valve consists of a drive module, a side-disassembly and plugging module, an intelligent monitoring module, an external connection module and a sealing module; the drive module includes a motor (4), a cable (29), a power battery (30), a dual-power conversion controller (3), a screw (5), a screw sealing sleeve (6), a sliding sleeve inner tube (15), a reset spring (7) and a coupling (22); the power battery (30) is installed in a battery compartment (8014) of an upper outer tube (8); the dual-power conversion controller (3) and the motor (4) are installed in a motor compartment (803) of the upper outer tube (8); the cable (29) is connected to a ground platform through a cable channel II (8016) of the upper outer tube (8); The sealing cover (2) is installed in the sealing cover bin (801) and the dual power conversion controller (3) and the motor (4) are sealed in the motor bin (803) of the upper outer tube (8); the coupling (22) connects the screw (5) and the motor (4); the screw sealing sleeve (6) seals the interface between the screw (5) and the motor bin (803); the sliding sleeve inner tube (15) is installed in the upper outer tube (8); the screw (5) is connected to the threaded hole III (1501) of the sliding sleeve inner tube (15); the reset spring (7) is sleeved on the sliding sleeve inner tube (15) and installed between the sliding sleeve inner tube (15) and the lower outer tube (9); the side disassembly sealing module includes a valve plate (12), a side disassembly valve plate seat (13), a torsion spring (11), a pin (10) and bolts I (21), the torsion spring (11) and the valve plate (12) are installed on the side-detachable valve plate seat (13) through a pin shaft (10), and the bolts I (21) fix the side-detachable valve plate seat (13) in the rectangular annulus (902) of the lower outer tube (9); the intelligent monitoring module includes a flow sensing element (17), a gas sensing element (18), a temperature sensing element (19), a pressure sensing element (20) and a signal converter (31), the flow sensing element (17) is installed in a threaded sensing element compartment I (808), the gas sensing element (18) is installed in a threaded sensing element compartment II (809), and the temperature sensing element (19) is installed in a threaded sensing element compartment III (8010 ), the pressure sensing element (20) is installed in the threaded sensing element compartment IV (8011), and the signal converter (31) is installed in the signal converter compartment (8015) of the upper outer tube (8); the external connection module includes an upper outer tube (8), a lower outer tube (9), an upper joint (1), a lower joint (14), a cover plate (16) and a bolt II (23), the upper outer tube (8) and the lower outer tube (9) are connected by threads, the cover plate (16) is embedded in the rectangular groove (807) and fixed to the upper outer tube (8) by bolts II (23), the upper joint (1) is installed on the upper end of the upper outer tube (8) by threaded connection, and the lower joint (14) is installed on the lower end of the lower outer tube (9) by threaded connection;The sealing module includes a sealing ring I (24), a sealing gasket I (25), a sealing gasket II (26), a sealing gasket III (27) and a sealing ring II (28), wherein the sealing ring I (24) is installed in the sealing ring groove I (1304) of the side-detachable valve plate seat (13), the sealing gasket I (25) is installed between the lower joint (14) and the lower outer tube (9), the sealing gasket II (26) is installed between the lower outer tube (9) and the upper outer tube (8), the sealing gasket III (27) is installed between the upper outer tube (8) and the upper joint (1), and the sealing ring II (28) is installed in the sealing ring groove II (1603) of the cover plate (16).

2. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The upper outer tube (8) is provided with a sealing cover compartment (801), a cable channel I (802), a motor compartment (803), an internal thread I (804), an axial semi-cylinder (805), an internal thread II (806), a rectangular groove (807), a threaded sensing element compartment I (808), a threaded sensing element compartment II (809), a threaded sensing element compartment III (8010), a threaded sensing element compartment IV (8011), an internal thread III (8012), four threaded holes V (8013), a battery compartment (8014), a signal converter compartment (8015) and a cable channel II (8 016), the sealing cover compartment (801) is used to install the sealing cover (2), the cable line channel I (802) is a wire channel for the signal converter (31), the dual power conversion controller (3) and the power battery (30), the battery compartment (8014) is used to install the power battery (30), the signal converter compartment (8015) is used to install the signal converter (31), the cable line channel II (8016) is a channel for the cable (29), the upper connector (1) and the sealing gasket III (27) are installed on the upper end of the upper outer tube (8) through threaded connection and the power battery (30) is sealed in the battery compartment (8014).

3. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The inner tube of the sliding sleeve (15) is provided with a threaded hole III (1501) and three semicircular holes (1502). The threaded hole III (1501) is used to connect with the screw (5). The three semicircular holes (1502) and the three axial semicircular cylinders (805) in the upper outer tube (8) cooperate to fix the inner tube of the sliding sleeve (15) circumferentially.

4. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The lower outer tube (9) is provided with an external thread II (901), a rectangular annulus (902), a special-shaped cavity (903), an internal thread IV (904) and 8 threaded holes II (905). The external thread II (901) and the internal thread II (806) are connected. The rectangular annulus (902) passes through the lower outer tube (9) from the side. The rectangular annulus (902) is used to install the side demolition plugging module and fix the side demolition plugging module with 8 bolts II (23). The special-shaped cavity (903) provides a movement space for the opening and closing action of the valve plate (12). The internal thread IV (904) is used to install the lower joint (14). The 8 threaded holes II (905) are used to install the 8 bolts II (23).

5. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The side-detachable valve plate seat (13) is provided with 8 through holes I (1301), a valve plate cavity (1302), a threaded hole IV (1303), and a sealing ring groove I (1304). The through hole I (1301) is aligned with the threaded hole II (905) and is used to install the bolt II (23). The valve plate cavity (1302) is used to accommodate the valve plate (12) when the valve plate (12) is opened. The threaded hole IV (1303) is used to install the pin shaft (10). The sealing ring groove I (1304) is used to install the sealing ring I (24).

6. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The upper joint (1) is provided with an external thread I (101) and a male buckle end (102), the external thread I (101) is connected to the internal thread III (8012) of the upper outer tube (8), and the male buckle end (102) is used to be connected to the female buckle end of the upper pipe column.

7. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The lower joint (14) is provided with an external thread III (1401) and a female buckle end (1402), the external thread III (1401) is connected to the internal thread IV (904) of the lower outer tube (9), and the female buckle end (1402) is used to be connected to the male buckle end of the lower pipe column.

8. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The cover plate (16) is provided with four through holes II (1601), a convex edge (1602) and a sealing ring groove II (1603). The sealing ring groove II (1603) is used to install the sealing ring II (28). The convex edge (1602) is embedded in the rectangular groove (807) of the upper outer tube (8). The through holes II (1601) and the threaded holes V (8013) are aligned and bolts II (23) are installed to fix the cover plate (16) on the upper outer tube (8).

9. The easy-to-maintain electronically controlled downhole safety valve according to claim 1, characterized in that: The intelligent monitoring module comprises a flow sensing element (17), a gas sensing element (18), a temperature sensing element (19), a pressure sensing element (20) and a signal converter (31). The flow sensing element (17) is used to monitor the fluid flow rate, the gas sensing element (18) is used to monitor the toxic gas content, the temperature sensing element (19) is used to monitor the downhole temperature, and the pressure sensing element (20) is used to monitor the downhole pressure. The signal converter (31) transmits the monitored data to a ground monitoring station in real time via a cable (29).

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