Subsurface safety valve capable of monitoring on-off state

Abstract

The utility model relates to the technical field of safety valves, in particular to a subsurface safety valve capable of monitoring the on-off state. Comprising a permanent magnet, a full-polarity Hall element, a signal measuring circuit and a signal display unit, the input end of the signal measuring circuit is connected with the full-polarity Hall element, and the output end of the signal measuring circuit is connected with the signal display unit. According to the utility model, the permanent magnet and the all-polarity Hall element are arranged, when the rebound plugging assembly rotates until the valve port is completely opened, the all-polarity Hall element can detect that the permanent magnet is close to the all-polarity Hall element, and the all-polarity Hall element outputs a low-level pulse signal; on the contrary, the all-polarity Hall element can detect that the permanent magnet is far away from the all-polarity Hall element, and the all-polarity Hall element outputs a high-level pulse signal; after measurement is carried out through the signal measurement circuit, display is carried out through the signal display unit, and therefore the opening and closing state of the subsurface safety valve can be visually monitored.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and more specifically, to a downhole safety valve capable of monitoring the opening and closing state. Background Art

[0002] In the safety regulations for offshore oil operations in China, it is clearly stated that during the application of oil well safety control technology, before an offshore oil production well enters production, it should be equipped with a complete Christmas tree, wellhead, downhole safety valve, and detection and monitoring systems, and pressure resistance tests and closing experiments should be carried out in advance to ensure production safety. The downhole safety valve is a control device for abnormal fluid flow in the well. When abnormal situations such as fire alarms and pipeline ruptures occur in offshore production facilities, it can automatically close to control the fluid flow in the well, and it is an important part of the offshore completion production string.

[0003] Under the existing technical conditions, the opening and closing state of the downhole safety valve can only be indirectly judged by auxiliary methods such as the pressure change of the hydraulic oil in its hydraulic control pipeline, the volume of the hydraulic oil discharged at the Christmas tree, observing the wellhead pressure and temperature changes after starting the well, etc. It is impossible to directly observe the opening and closing state of the downhole safety valve, and there are risks such as the downhole safety valve not being opened, starting the well in a slightly open state resulting in overloading and burning of the electric submersible pump motor, and leakage of the production string. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiency in the prior art that the opening and closing state of the downhole safety valve cannot be directly observed, and to provide a downhole safety valve capable of monitoring the opening and closing state, which can directly monitor the opening and closing state of the downhole safety valve.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A downhole safety valve capable of monitoring the opening and closing state includes an outer pipe with a valve port, a resilient plugging component for plugging the valve port, and a driving mechanism for driving the resilient plugging component to rotate. The resilient plugging component is rotatably arranged at the valve port, the driving mechanism is arranged on the outer pipe, and further includes a permanent magnet, a fully polar Hall element, a signal measurement circuit, and a signal display unit. The permanent magnet is arranged on the resilient plugging component, the fully polar Hall element is arranged on the outer pipe, the input end of the signal measurement circuit is connected to the fully polar Hall element, and the output end of the signal measurement circuit is connected to the signal display unit; when the valve port is fully opened, the permanent magnet is close to the fully polar Hall element; when the valve port is fully closed, the permanent magnet is far away from the fully polar Hall element.

[0007] According to the above technical means, a downhole safety valve capable of monitoring the switch state provided by the present utility model, when working normally, that is, when the valve port is about to be opened, the pushing mechanism is started, and the pushing mechanism drives the spring-back plugging assembly to rotate. When rotating, it drives the permanent magnet located on the spring-back plugging assembly to move. When the spring-back plugging assembly rotates to the valve port being fully opened, at this time, the omnipolar Hall element can detect the permanent magnet approaching the omnipolar Hall element, and the omnipolar Hall element outputs a low-level pulse signal. After the low-level pulse signal is measured by the signal measurement circuit, it is displayed through the signal display unit, so that the opening state of the downhole safety valve can be visually monitored. When closing, the pushing mechanism retracts, the spring-back plugging assembly rotates in the reverse direction, and the permanent magnet moves driven by the spring-back plugging assembly. At this time, the omnipolar Hall element can detect the permanent magnet moving away from the omnipolar Hall element, and the omnipolar Hall element outputs a high-level pulse signal. After the high-level pulse signal is measured by the signal measurement circuit, it is displayed through the signal display unit, so that the closing state of the downhole safety valve can be visually monitored. By setting the permanent magnet, the omnipolar Hall element, the signal measurement circuit and the signal display unit, the switch state of the downhole safety valve can be visually monitored.

[0008] Further, the signal measurement circuit includes a power supply, a modulator and a coupler. The power supply is sequentially connected in series with the input port of the omnipolar Hall element, the modulator and the coupler. The coupling port of the coupler is electrically connected to the omnipolar Hall element and the modulator, and the output port of the coupler is electrically connected to the signal display unit. The pulse signal output by the omnipolar Hall element is modulated into a high-frequency signal by the modulator, and then loaded on the output port of the coupler through the coupler and displayed through the signal display unit.

[0009] Further, a protection capacitor is also included. The power supply is sequentially connected in series with the omnipolar Hall element, the modulator, the input port of the coupler and the protection capacitor. By setting the protection capacitor, the power supply voltage can be smoothed, ensuring the stability of the power supply and enabling the signal measurement circuit to operate normally.

[0010] Further, the signal display unit includes a demodulator, a controller and a display that are sequentially electrically connected. The output end of the signal measurement circuit is electrically connected to the demodulator. The low-voltage power line signal at the output port of the coupler is demodulated by the demodulator, and the switch state is transmitted to the controller. The display collects the signal of the controller and displays it, so that the switch state of the downhole safety valve can be visually monitored.

[0011] Further, a self-balancing hole is provided in the outer tube. The self-balancing hole communicates with both sides of the valve port, and a self-balancing assembly is provided in the self-balancing hole. By setting the self-balancing assembly and the self-balancing hole, it is convenient to balance the pressure on both sides of the valve port and facilitate the opening of the spring-back plugging assembly.

[0012] Furthermore, the self-balancing component includes a steel ball configured to cooperate with one end of the self-balancing hole to form a seal and capable of being pushed by the pushing mechanism to release the seal, and a first elastic member having two ends respectively connected to the steel ball and the outer tube. The first elastic member abuts the steel ball against the self-balancing hole to form a seal. When opening the valve port, when the pushing mechanism pushes the rebounding plugging component, it can also compress the first elastic member to push the steel ball into the self-balancing hole, thereby releasing the seal between the steel ball and the self-balancing hole and allowing the two sides of the valve port to communicate with each other.

[0013] Furthermore, the self-balancing hole is located on the side of the valve port close to the pushing mechanism. The self-balancing hole is arranged along the radial direction of the outer tube. The inner diameter of one end of the self-balancing hole gradually increases from the pushing mechanism towards the outer tube. The steel ball is slidably connected to one end of the self-balancing hole. When starting the pushing mechanism, the pushing mechanism pushes the steel ball towards the outside of the outer tube. Since the inner diameter of one end of the self-balancing hole gradually increases from the pushing mechanism towards the outer tube, the seal between the steel ball and the self-balancing hole is released, allowing the two sides of the valve port to communicate with each other.

[0014] Furthermore, the rebounding plugging component includes a valve flap for plugging the valve port and a second elastic member. The valve flap is rotatably arranged at the valve port. Two ends of the second elastic member are respectively connected to the outer tube and the valve flap. The permanent magnet is arranged on the valve flap. When opening, the pushing mechanism pushes the valve flap to rotate, and the second elastic member stores elastic potential energy; when closing, the pushing mechanism retracts, and the valve flap is reset under the action of the second elastic member to close the valve port.

[0015] Furthermore, the pushing mechanism includes a hydraulic cylinder, a piston, a central tube, a power spring, and a hydraulic pipeline for connecting to a ground pressure control system. The hydraulic pipeline is connected to the hydraulic cylinder. The hydraulic cylinder is arranged on the outer tube. The piston is connected to the output end of the hydraulic cylinder. The piston is slidably connected to the outer tube. The central tube is connected to the piston. Both ends of the central tube communicate with both ends of the outer tube. The power spring is arranged along the axial direction of the central tube. Two ends of the power spring are respectively connected to the central tube and the outer tube. When opening the valve port, control the ground pressure control system to pressurize the hydraulic cylinder through the hydraulic pipeline. The piston drives the central tube to move towards the rebounding plugging component by compressing the power spring, and pushes open the rebounding plugging component; when closing the valve port, control the ground pressure control system to depressurize the hydraulic cylinder through the hydraulic pipeline. The piston is reset under the action of the power spring, driving the central tube to move away from the rebounding plugging component, and the rebounding plugging component is reset.

[0016] Further, it further includes a frequency conversion cabinet, a transformer, a junction box, an ESP cable, and a rectifier diode that are electrically connected in sequence. The three-phase AC core point of the ESP cable is electrically connected to the input end of the signal measurement circuit through the rectifier diode. The voltage of the three-phase AC core point is constantly zero, and the signal measurement circuit is grounded through the casing. The frequency conversion cabinet is electrically connected to the signal display unit through the transformer. The output end of the signal measurement circuit is electrically connected to the signal display unit through the three-phase AC core point and the junction box in sequence. The ESP cable is powered by the frequency conversion cabinet, the transformer, and the junction box, and then the signal measurement circuit and the signal display unit are powered. The rectifier diode is set to rectify the alternating current into direct current to power the signal measurement circuit.

[0017] Compared with the prior art, the beneficial effects are as follows:

[0018] 1. For the downhole safety valve capable of monitoring the switch state provided by the present utility model, by setting a permanent magnet and a fully polarized Hall element, when the rebound plugging assembly rotates to the valve opening being fully opened, the fully polarized Hall element can detect the permanent magnet approaching the fully polarized Hall element, and the fully polarized Hall element outputs a low-level pulse signal; conversely, the fully polarized Hall element can detect the permanent magnet moving away from the fully polarized Hall element, and the fully polarized Hall element outputs a high-level pulse signal. After being measured by the signal measurement circuit, it is displayed by the signal display unit, so that the switch state of the downhole safety valve can be visually monitored.

[0019] 2. For the downhole safety valve capable of monitoring the switch state provided by the present utility model, the pulse signal output by the fully polarized Hall element is modulated into a high-frequency signal by a modulator, and then loaded on the output port of the coupler through a coupler. The low-voltage power line signal at the output port of the coupler is demodulated by a demodulator, and the switch state is transmitted to the controller. The display collects the signal of the controller and displays it, which is beneficial to visually and accurately monitor the switch state of the downhole safety valve.

[0020] 3. For the downhole safety valve capable of monitoring the switch state provided by the present utility model, by setting a self-balancing assembly and a self-balancing hole, it is possible to facilitate the balancing of the pressures on both sides of the valve opening and facilitate the opening of the rebound plugging assembly. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the downhole safety valve capable of monitoring the switch state of the present utility model when it is opened;

[0022] Figure 2 is a schematic structural diagram of the downhole safety valve capable of monitoring the switch state of the present utility model when it is closed;

[0023] Figure 3 is a schematic diagram of the signal measurement circuit of the present utility model;

[0024] Figure 4 It is a schematic diagram of the signal display unit of the present utility model.

[0025] Among them, the illustration marks are explained as follows: 1. Outer tube; 101. Valve port; 2. Rebound sealing assembly; 201. Valve flap; 202. Second elastic member; 3. Pushing mechanism; 301. Hydraulic pipeline; 302. Hydraulic cylinder; 303. Piston; 304. Central tube; 305. Power spring; 4. Permanent magnet; 5. All-polarity Hall element; 6. Signal measurement circuit; 601. Power supply; 602. Modulator; 603. Coupler; 604. Rectifier diode; 605. Protection capacitor; 7. Signal display unit; 701. Demodulator; 702. Controller; 703. Display; 8. Self-balancing assembly; 9. Frequency conversion cabinet; 10. Transformer; 11. Junction box; 12. Electrical submersible pump cable. Specific embodiments

[0026] 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 of the embodiments. The present invention will be described in one of the embodiments in conjunction with the specific embodiments. Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0027] In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time.

[0028] Example 1

[0029] As Figures 1 to 4 shown, this embodiment provides a downhole safety valve capable of monitoring the switch state, including an outer tube 1 with a valve port 101, a resilient plugging component 2 for plugging the valve port 101, and a driving mechanism 3 for driving the resilient plugging component 2 to rotate. The resilient plugging component 2 is rotatably arranged at the valve port 101, and the driving mechanism 3 is arranged on the outer tube 1. It also includes a permanent magnet 4, a full-polarity Hall element 5, a signal measurement circuit 6, and a signal display unit 7. The permanent magnet 4 is arranged on the resilient plugging component 2, the full-polarity Hall element 5 is arranged on the outer tube 1, the input end of the signal measurement circuit 6 is connected to the full-polarity Hall element 5, and the output end of the signal measurement circuit 6 is connected to the signal display unit 7; when the valve port 101 is fully opened, the permanent magnet 4 is close to the full-polarity Hall element 5; when the valve port 101 is fully closed, the permanent magnet 4 is far from the full-polarity Hall element 5.

[0030] According to the above technical means, for a downhole safety valve capable of monitoring the switch state provided by the present utility model, during normal operation, when the valve port 101 is about to be opened, the driving mechanism 3 is started. The driving mechanism 3 drives the resilient plugging component 2 to rotate, and during the rotation, it drives the permanent magnet 4 located on the resilient plugging component 2 to move. When the resilient plugging component 2 rotates to the position where the valve port 101 is fully opened, that is, when the resilient plugging component 2 rotates to be arranged radially along the outer tube 1, as Figure 1 shown, at this time, the full-polarity Hall element 5 can detect that the permanent magnet 4 is close to the full-polarity Hall element 5. The full-polarity Hall element 5 outputs a low-level pulse signal. After the low-level pulse signal is measured by the signal measurement circuit 6, it is displayed through the signal display unit 7, so that the opening state of the downhole safety valve can be visually monitored. When closing, the driving mechanism 3 retracts, the resilient plugging component 2 rotates in the reverse direction, and the permanent magnet 4 moves under the drive of the resilient plugging component 2. At this time, the full-polarity Hall element 5 can detect that the permanent magnet 4 is far from the full-polarity Hall element 5. The full-polarity Hall element 5 outputs a high-level pulse signal. After the high-level pulse signal is measured by the signal measurement circuit 6, it is displayed through the signal display unit 7, so that the closing state of the downhole safety valve can be visually monitored. The full-polarity Hall element 5 can detect the magnetic field and its changes, has low power consumption, and is resistant to pollution or corrosion by oil, salt spray, etc. in the wellbore; the permanent magnet 4 uses bonded neodymium iron boron. By setting the permanent magnet 4, the full-polarity Hall element 5, the signal measurement circuit 6, and the signal display unit 7, the switch state of the downhole safety valve can be visually monitored.

[0031] Example 2

[0032] The downhole safety valve capable of monitoring the switch state proposed in this embodiment, on the basis of Example 1, in this embodiment, as Figure 3As shown, the signal measurement circuit 6 includes a power supply 601, a modulator 602, and a coupler 603. The power supply 601 is connected in series with the full-polarity Hall element 5, the modulator 602, and the input port of the coupler 603 in sequence. The coupling port of the coupler 603 is electrically connected to the full-polarity Hall element 5 and the modulator 602, and the output port of the coupler 603 is electrically connected to the signal display unit 7. The pulse signal output by the full-polarity Hall element 5 is modulated into a high-frequency signal by the modulator 602, and then is loaded on the output port of the coupler 603 through the coupler 603 and is displayed by the signal display unit 7.

[0033] It further includes a protection capacitor 605. The power supply 601 is connected in series with the full-polarity Hall element 5, the modulator 602, the input port of the coupler 603, and the protection capacitor 605 in sequence. By setting the protection capacitor 605, the power supply voltage can be smoothed, ensuring the stability of the power supply 601 and enabling the signal measurement circuit 6 to operate normally.

[0034] As Figure 4 shown, the signal display unit 7 includes a demodulator 701, a controller 702, and a display 703 that are electrically connected in sequence. The output end of the signal measurement circuit 6 is electrically connected to the demodulator 701. The signal display unit 7 is arranged on the ground. The low-voltage power line signal at the output port of the coupler 603 is demodulated by the demodulator 701, and the switch state is transmitted to the controller 702. The display 703 collects the signal of the controller 702 and displays it, enabling the switch state of the downhole safety valve to be transmitted over a long distance, so that the switch state of the downhole safety valve can be visually monitored.

[0035] The switch state of the downhole safety valve is converted into a high-frequency carrier signal of the modulator 602, and the switch signal of the downhole safety valve is transmitted by using the high-frequency power carrier signal. The signal is not easily distorted, has high accuracy, is easy to control, and has high result reliability. The coupler 603 couples the signal and loads it on the output port of the coupler 603. After being demodulated by the demodulator 701 on the ground, the downhole switch state is judged, avoiding serious consequences such as the electric submersible pump motor being overloaded and burned out and the production pipe bursting and leaking due to mis-starting the well.

[0036] Embodiment 3

[0037] A downhole safety valve capable of monitoring the switch state proposed in this embodiment, on the basis of Embodiment 1, in this embodiment, as Figure 1 and Figure 2 shown, a self-balancing hole is provided inside the outer pipe 1. The self-balancing hole communicates with both sides of the valve port 101, and a self-balancing assembly 8 is provided inside the self-balancing hole. By providing the self-balancing assembly 8 and the self-balancing hole, it is possible to facilitate the balancing of the pressures on both sides of the valve port 101 and facilitate the opening of the rebound sealing assembly 2.

[0038] The self - balancing component 8 includes a steel ball that is used to cooperate with one end of the self - balancing hole to form a seal and can be pushed by the pushing mechanism 3 to release the seal, and a first elastic member with two ends respectively connected to the steel ball and the outer tube 1. The first elastic member abuts the steel ball against the self - balancing hole to form a seal. When opening the valve port 101, when the pushing mechanism 3 pushes the rebounding plugging component 2, it can also compress the first elastic member to push the steel ball into the self - balancing hole, thereby releasing the seal between the steel ball and the self - balancing hole and allowing both sides of the valve port 101 to communicate.

[0039] The self - balancing hole is located on the side of the valve port 101 close to the pushing mechanism 3. The self - balancing hole is arranged along the radial direction of the outer tube 1. The inner diameter of one end of the self - balancing hole gradually increases from the pushing mechanism 3 to the outer tube 1. The steel ball is slidably connected to one end of the self - balancing hole. When starting the pushing mechanism 3, the pushing mechanism 3 pushes the steel ball towards the outside of the outer tube 1. Since the inner diameter of one end of the self - balancing hole gradually increases from the pushing mechanism 3 to the outer tube 1, the seal between the steel ball and the self - balancing hole is released, allowing both sides of the valve port 101 to communicate.

[0040] The self - balancing component 8 further includes an abutting member. Two ends of the abutting member are respectively connected to the outer tube 1 and the first elastic member. The abutting member can be set as a bolt. Through the abutting member, the pressing degree of the first elastic member on the steel ball can be adjusted, so that the sealing degree between the steel ball and the self - balancing hole can be adjusted.

[0041] Embodiment 4

[0042] A downhole safety valve capable of monitoring the switch state proposed in this embodiment is based on any one of Embodiments 1 to 3. In this embodiment, as Figure 2 shown, the rebounding plugging component 2 includes a valve flap 201 for plugging the valve port 101 and a second elastic member 202. The valve flap 201 is rotatably arranged at the valve port 101. Two ends of the second elastic member 202 are respectively connected to the outer tube 1 and the valve flap 201. When opening, the pushing mechanism 3 pushes the valve flap 201 to rotate, and the second elastic member 202 stores elastic potential energy; when closing, the pushing mechanism 3 retracts, and the valve flap 201 resets under the action of the second elastic member 202 to close the valve port 101. The outer tube 1 is provided with a valve seat at the valve port 101, and the valve seat and the valve flap 201 form a seal. A permanent magnet 4 is arranged on the valve flap 201. As Figure 2 shown, in this embodiment, the permanent magnet 4 is arranged on the side of the valve flap 201 far from the pushing mechanism 3, making the distance between the permanent magnet 4 and the fully - polarized Hall element 5 closer, which is more conducive to the fully - polarized Hall element 5 sensing the permanent magnet 4.

[0043] The actuating mechanism 3 includes a hydraulic cylinder 302, a piston 303, a central tube 304, a power spring 305, and a hydraulic pipeline 301 for connecting to a ground pressure control system. The hydraulic pipeline 301 is connected to the hydraulic cylinder 302. The hydraulic cylinder 302 is disposed on the outer tube 1. The piston 303 is connected to the output end of the hydraulic cylinder 302. The piston 303 is slidably connected to the outer tube 1. The central tube 304 is connected to the piston 303. Both ends of the central tube 304 communicate with both ends of the outer tube 1. The power spring 305 is arranged along the axial direction of the central tube 304. Both ends of the power spring 305 are respectively connected to the central tube 304 and the outer tube 1. When opening the valve port 101, the ground pressure control system is controlled to pressurize the hydraulic cylinder 302 through the hydraulic pipeline 301, enabling remote control of the actuating mechanism 3. The piston 303 drives the central tube 304 to move towards the resilient plugging assembly 2 by compressing the power spring 305, pushing open the resilient plugging assembly 2. When closing the valve port 101, the ground pressure control system is controlled to relieve the pressure of the hydraulic cylinder 302 through the hydraulic pipeline 301. The piston 303 is reset under the action of the power spring 305, driving the central tube 304 to move away from the resilient plugging assembly 2, and the resilient plugging assembly 2 is reset.

[0044] As Figure 4 shown, it further includes a frequency conversion cabinet 9, a transformer 10, a junction box 11, an electrical submersible pump cable 12, and a rectifier diode 604 that are electrically connected in sequence. The three-phase alternating current core point of the electrical submersible pump cable 12 is electrically connected to the input end of the signal measurement circuit 6 through the rectifier diode 604. The voltage of the three-phase alternating current core point is constantly zero, and the signal measurement circuit 6 is grounded through the casing. The frequency conversion cabinet 9 is electrically connected to the signal display unit 7 through the transformer 10. The output end of the signal measurement circuit 6 is electrically connected to the signal display unit 7 through the three-phase alternating current core point and the junction box 11 in sequence. The electrical submersible pump cable 12 is powered through the frequency conversion cabinet 9, the transformer 10, and the junction box 11, and then the signal measurement circuit 6 and the signal display unit 7 are powered. By setting the rectifier diode 604, the alternating current is rectified into direct current to power the signal measurement circuit 6.

[0045] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A downhole safety valve capable of monitoring a switch state, comprising an outer tube (1) having a valve port (101), a rebound plugging component (2) for plugging the valve port (101), and a driving mechanism (3) for driving the rebound plugging component (2) to rotate, wherein the rebound plugging component (2) is rotatably arranged at the valve port (101), and the driving mechanism (3) is arranged on the outer tube (1); characterized in that: The valve assembly (101) further comprises a permanent magnet (4), an omnipolar Hall element (5), a signal measurement circuit (6) and a signal display unit (7); the permanent magnet (4) is arranged on the rebound sealing component (2); the omnipolar Hall element (5) is arranged on the outer tube (1); the input end of the signal measurement circuit (6) is connected to the omnipolar Hall element (5); the output end of the signal measurement circuit (6) is connected to the signal display unit (7); when the valve port (101) is fully opened, the permanent magnet (4) is close to the omnipolar Hall element (5); when the valve port (101) is fully closed, the permanent magnet (4) is away from the omnipolar Hall element (5).

2. The downhole safety valve capable of monitoring the switch status according to claim 1, characterized in that: The signal measurement circuit (6) comprises a power supply (601), a modulator (602) and a coupler (603); the power supply (601) is sequentially connected in series with the omnipolar Hall element (5), the modulator (602) and the input port of the coupler (603); the coupling port of the coupler (603) is electrically connected with the omnipolar Hall element (5) and the modulator (602); and the output port of the coupler (603) is electrically connected with the signal display unit (7).

3. The downhole safety valve capable of monitoring the switch status according to claim 2, characterized in that: It also includes a protection capacitor (605), and the power supply (601) is connected in series with the omnipolar Hall element (5), the modulator (602), the input port of the coupler (603), and the protection capacitor (605) in sequence.

4. The downhole safety valve capable of monitoring the switch status according to claim 2, characterized in that: The signal display unit (7) comprises a demodulator (701), a controller (702) and a display (703) which are electrically connected in sequence, and the output end of the signal measurement circuit (6) is electrically connected to the demodulator (701).

5. The downhole safety valve capable of monitoring the switch status according to claim 1, characterized in that: A self-balancing hole is provided in the outer tube (1), the self-balancing hole is communicated with two sides of the valve port (101), and a self-balancing component (8) is provided in the self-balancing hole.

6. The downhole safety valve capable of monitoring the switch status according to claim 5, characterized in that: The self-balancing component (8) comprises a steel ball used to cooperate with one end of the self-balancing hole to form a seal and capable of being pushed by the pushing mechanism (3) to release the seal, and a first elastic member having two ends respectively connected to the steel ball and the outer tube (1).

7. The downhole safety valve capable of monitoring the switch status according to claim 6, characterized in that: The self-balancing hole is located on a side of the valve port (101) close to the driving mechanism (3), the self-balancing hole is arranged along the radial direction of the outer tube (1), the inner diameter of one end of the self-balancing hole gradually increases from the driving mechanism (3) to the outer tube (1), and the steel ball is slidably connected to one end of the self-balancing hole.

8. The downhole safety valve capable of monitoring the switch status according to any one of claims 1 to 7, characterized in that: The rebound sealing component (2) comprises a valve flap (201) for sealing the valve port (101) and a second elastic member (202); the valve flap (201) is rotatably arranged at the valve port (101); two ends of the second elastic member (202) are respectively connected to the outer tube (1) and the valve flap (201); and the permanent magnet (4) is arranged on the valve flap (201).

9. The downhole safety valve capable of monitoring the switch status according to any one of claims 1 to 7, characterized in that: The pushing mechanism (3) comprises a hydraulic cylinder (302), a piston (303), a central tube (304), a power spring (305) and a hydraulic pipeline (301) for connecting to a ground pressure control system, wherein the hydraulic pipeline (301) is connected to the hydraulic cylinder (302), the hydraulic cylinder (302) is arranged on the outer tube (1), the piston (303) is connected to the output end of the hydraulic cylinder (302), the piston (303) is slidably connected to the outer tube (1), the central tube (304) is connected to the piston (303), the two ends of the central tube (304) are connected to the two ends of the outer tube (1), the power spring (305) is arranged along the axial direction of the central tube (304), and the two ends of the power spring (305) are respectively connected to the central tube (304) and the outer tube (1).

10. The downhole safety valve capable of monitoring the switch status according to any one of claims 1 to 7, characterized in that: It also includes a frequency conversion cabinet (9), a transformer (10), a junction box (11), an electric submersible pump cable (12) and a rectifier diode (604) which are electrically connected in sequence, wherein the three-phase AC core point of the electric submersible pump cable (12) is electrically connected to the input end of the signal measurement circuit (6) through the rectifier diode (604), the voltage of the three-phase AC core point is always zero and the signal measurement circuit (6) is grounded through a bushing; the frequency conversion cabinet (9) is electrically connected to the signal display unit (7) through the transformer (10), and the output end of the signal measurement circuit (6) is electrically connected to the signal display unit (7) through the three-phase AC core point and the junction box (11) in sequence.

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