A downhole casing valve monitoring and control system

Abstract

The application discloses a downhole casing valve measurement and control system, which comprises a piston for driving a valve plate and a hydraulic control system for driving the piston; the hydraulic control system comprises a motor pump valve assembly, a hydraulic control driving electromagnetic valve assembly, a hydraulic control oil return electromagnetic valve assembly and a balanced piston oil bag assembly; the motor pump valve assembly comprises a motor and a hydraulic pump connected with the motor; the application further comprises a battery pack, a processor, an electromagnetic induction coil and a vibration sensor, and the electromagnetic induction coil is connected with a ground opening and stopping pump sequence signal and a hydraulic control system signal; the application can trigger the opening and closing of the valve plate in two ways, one of which is to trigger the hydraulic control system to push the piston to realize the opening and closing of the valve plate through the ground opening and stopping pump sequence signal, and the other of which is to trigger the hydraulic control system to push the piston to realize the opening and closing of the valve plate through the induction signal of the electromagnetic induction coil, so that the triggering success rate is improved; and the opening and closing of the valve plate is not limited by the performance of a ground mud pump and the bottom hole fluid column pressure, and the opening and closing sensitivity of the valve plate is improved.

Description

Technical Field

[0001] This application relates to the field of underbalanced drilling technology in oil and gas fields, and in particular to a downhole casing valve monitoring and control system that can realize underbalanced drilling throughout the entire process. Background Technology

[0002] Maintaining a relatively stable underbalanced state within the wellbore throughout the drilling and tripping operations is crucial for reservoir protection and drilling safety. Full-process underbalanced drilling refers to maintaining an underbalanced state at the bottom of the well throughout the entire drilling, logging, and tripping process to achieve the goals of reservoir discovery and protection. In full-process underbalanced drilling, the bottomhole pressure is kept lower than the formation pressure throughout both drilling and tripping operations.

[0003] Currently, there are two methods for achieving underbalanced drilling throughout the entire oil drilling process: one is using a non-pressure-controlled tripping and pulling device, and the other is using a downhole casing valve. The method using a downhole casing valve for underbalanced drilling is briefly described as follows: During tripping, the wellhead is pressurized. When the drill bit is below the downhole casing valve, a rotary control head and a dedicated choke manifold are used to apply back pressure at the wellhead, achieving dynamic control of the wellbore pressure. When the drill bit is pulled above the downhole casing valve, the downhole casing valve is closed via a surface control device to isolate the wellbore. At this point, the wellhead is depressurized, and the rotary control head can be disassembled for conventional tripping operations. When the drill bit approaches the downhole casing valve, the rotary control head is seated at the wellhead, connected to the crisscross drill pipe, and a small-displacement pump is started to pressurize and assist in opening the downhole casing valve to open the well. After opening the well, the crisscross drill pipe is removed to begin the tripping operation. During the tripping process, a rotary control head and a dedicated choke manifold are used to apply back pressure at the wellhead, achieving dynamic control of the wellbore pressure.

[0004] With the increasing development of drilling engineering, and with oil and gas reservoirs becoming more and more difficult to develop and geological conditions becoming more and more complex, the usual underbalanced drilling operations cannot achieve an underbalanced state during well completion, logging and tripping, and cannot effectively protect the oil and gas reservoir.

[0005] It is evident that conventional downhole casing valves used in underbalanced drilling are no longer adequate for current drilling conditions. They fail to achieve an underbalanced state and thus cannot effectively protect oil and gas reservoirs. Furthermore, the traditional method of using mud pressure to open and close the downhole casing valve plate is limited by the performance of the surface mud pump and the bottom hole fluid column pressure, resulting in insufficient sensitivity of the valve plate. Therefore, a new technical solution is urgently needed to address the problems existing in the current technology. Summary of the Invention

[0006] This application provides a downhole casing valve monitoring and control system to solve the current problems of limited valve plate opening and closing and insufficient response in downhole casing valves.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] This application provides a downhole casing valve monitoring and control system, including a casing body, a piston for driving a valve plate is disposed inside the casing body, and the piston and the inner wall of the casing body form a hydraulic oil chamber; a receiving cavity is opened on the side wall of the casing body, a hydraulic control system and circuit components are disposed in the receiving cavity, and a sealing cover is provided at the opening of the receiving cavity.

[0009] The hydraulic control system includes a motor-pump-valve assembly, a hydraulically controlled drive solenoid valve assembly, a hydraulically controlled return solenoid valve assembly, a balance piston oil bladder assembly, and an oil tank; the motor-pump-valve assembly includes a motor and a hydraulic pump connected to the motor; the hydraulically controlled drive solenoid valve assembly is connected to the hydraulic pump oil circuit and to the circuit assembly signal; the hydraulically controlled return solenoid valve assembly is connected to the circuit assembly signal and to the balance piston oil bladder assembly oil circuit.

[0010] The circuit components include a battery pack, a power connector, a processor, a motor drive module, an electromagnetic induction coil, and a vibration sensor. The electromagnetic induction coil and the ground pump start / stop sequence signal are respectively connected to the hydraulic control system signal. The ground pump start / stop sequence signal triggers the hydraulic control system to push the piston to open and close the valve plate. The induction signal of the electromagnetic induction coil triggers the hydraulic control system to push the piston to open and close the valve plate.

[0011] Furthermore, in the above technical solution, one end of the piston is installed in the piston limiting sleeve, and the piston limiting sleeve is installed on the inner wall of the tube body; the piston moves back and forth along the hydraulic oil chamber under the action of hydraulic oil to realize the opening or closing of the valve plate.

[0012] Furthermore, one end of the hydraulic oil chamber forms a high-pressure oil inlet, and the other end forms a return oil port; the hydraulic oil chamber is connected to the oil circuit of the hydraulic control system.

[0013] Furthermore, the motor pump valve assembly also includes a relief valve group. The inlet end of the hydraulic pump is connected to the oil tank, and the outlet end of the hydraulic pump is connected to the oil tank through the relief valve group. The relief valve group includes a relief valve and a safety valve arranged in parallel.

[0014] Furthermore, the hydraulically controlled solenoid valve assembly includes a first solenoid valve and a second solenoid valve. The inlet end of the first solenoid valve is connected to the outlet end of the hydraulic pump, the outlet end of the first solenoid valve is connected to the inlet end of the second solenoid valve and is also connected to the high-pressure oil inlet, and the outlet end of the second solenoid valve is connected to the oil tank.

[0015] Furthermore, the hydraulic return solenoid valve assembly includes a third solenoid valve and a fourth solenoid valve. The inlet end of the third solenoid valve is connected to the outlet end of the hydraulic pump, the outlet end of the third solenoid valve is connected to the return port and the inlet end of the fourth solenoid valve, and the outlet end of the fourth solenoid valve is connected to the oil tank.

[0016] Furthermore, the motor is connected to the processor via a high-pressure sealed connector; the processor is equipped with an instruction receiving and motor control circuit module, which is connected to the power supply module, communication module, instruction receiving module, output control module, clock module, and storage module, respectively.

[0017] Furthermore, the processor is signal-connected to the hydraulically controlled drive solenoid valve assembly and the hydraulically controlled return solenoid valve assembly. The processor controls the piston by controlling the movement of the hydraulically controlled drive solenoid valve assembly and the hydraulically controlled return solenoid valve assembly, thereby controlling the opening and closing of the valve plate.

[0018] Furthermore, the battery pack is connected to the power-on connector, which in turn is connected to the processor. The processor controls the motor's start and stop via the motor drive module, which is connected to the electromagnetic induction coil. The processor is also connected to the electromagnetic induction coil via a signal connection.

[0019] Furthermore, the sleeve body has a cylindrical structure, and the receiving cavity is a strip-shaped groove opened along the axial direction of the sleeve body. The top of the strip-shaped groove is sealed by a sealing cover plate. A cover plate for covering the electrical connector is provided on the outer wall of the sleeve body.

[0020] Furthermore, the circuit components are connected to the ground control system, and the ground control system outputs ground pump start / stop sequence signals to the circuit components.

[0021] Furthermore, the electromagnetic induction coil is connected to the electromagnetic sensor signal installed at the drill bit. When the electromagnetic sensor detects a change in the surrounding electromagnetic field, it sends a signal to the electromagnetic induction coil, which then triggers the hydraulic control system upon receiving the signal.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] This application provides a downhole casing valve monitoring and control system, which includes a piston for driving the valve plate, a hydraulic control system for driving the piston, and circuit components; the hydraulic control system includes a motor-pump-valve assembly, a hydraulically controlled drive solenoid valve assembly, a hydraulically controlled return solenoid valve assembly, a balance piston oil bladder assembly, and an oil tank; the motor-pump-valve assembly includes a motor and a hydraulic pump connected to the motor; the circuit components include a battery pack, a power connector, a processor, a motor drive module, an electromagnetic induction coil, and a vibration sensor, wherein the electromagnetic induction coil and the surface pump start / stop sequence signal are respectively connected to the hydraulic control system signal. Therefore, the downhole casing valve monitoring and control system provided in this application can trigger the valve plate opening and closing in two ways: firstly, by triggering the hydraulic control system to push the piston to open and close the valve plate through a surface pump start / stop sequence signal; secondly, by triggering the hydraulic control system to push the piston to open and close the valve plate through an electromagnetic induction coil signal. These two valve plate opening and closing triggering methods improve the triggering success rate. Furthermore, this application uses a hydraulic control system to open and close the valve plate, which is not limited by the performance of the surface mud pump or the bottom hole fluid column pressure, solving the problem of difficulty in using mud pressure to open and close the valve plate in traditional methods, and improving the valve plate's opening and closing sensitivity. In addition, the system is equipped with a battery pack and a power connector to solve the problem of long-term power supply at the bottom hole. The use of the downhole casing valve monitoring and control system provided in this application can effectively control the risks of well kick and well leakage during drilling, and improve drilling efficiency and safety. By controlling the opening and closing of the valve plate, the wellhead pressure can be regulated to ensure that the bottom hole pressure is always greater than the wellhead pressure, achieving underbalanced drilling downhole and thus avoiding possible accidents. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concepts disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, and size ratios of certain units (components).

[0025] Figure 1 This is a schematic diagram of the structural composition of the downhole casing valve monitoring and control system provided in this application in one embodiment;

[0026] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at section AA;

[0027] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at section BB;

[0028] Figure 4 This is a schematic diagram of the hydraulic control principle of the downhole casing valve monitoring and control system provided in this application in one embodiment;

[0029] Figure 5 This is a circuit diagram of the hydraulic control system of the downhole casing valve monitoring and control system provided in this application, as one embodiment.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Sleeve body; 2. Hydraulic control system; 3. Two-way solenoid valve control assembly; 4. Hydraulic body; 5. Piston; 6. Piston limit sleeve; 7. Circuit assembly; 8. Sealing cover; 9. Electromagnetic induction coil; 10. Power connector; 11. Battery pack; 12. Balance piston oil bladder assembly; 13. High-pressure oil inlet; 14. Oil return port; 15. First solenoid valve; 16. Second solenoid valve; 17. Third solenoid valve; 18. Fourth solenoid valve; 19. Hydraulic pump; 20. Motor; 21. 21. Overflow valve; 22. Safety valve; 23. High-pressure sealing connector; 24. Oil tank; 25. Processor; 26. Command receiving and motor control circuit module; 27. Power supply module; 28. Communication module; 29. ​​Command receiving module; 30. Output control module; 31. Clock module; 32. Storage module; 33. Motor drive module; 34. RS485 bus; 35. Vibration switch module; 36. A / D conversion module; 37. DC / DC module; 38. 8-pin high-pressure sealing plug. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0034] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0035] To address the problems existing in the prior art, this application provides a downhole casing valve monitoring and control system. The valve plate is triggered in two ways: first, by a surface pump start / stop sequence signal triggering the hydraulic control system to push the piston and open or close the valve plate; second, by an electromagnetic induction signal at the drill bit triggering the hydraulic control system to push the piston and open or close the valve plate. The electromagnetic induction signal at the drill bit is identified by a vibration sensor and an electromagnetic induction coil.

[0036] The ground-based pump start-stop sequence signal in this application is used to control the start-stop sequence of pumps in a ground-based hydraulic system. To ensure normal pump operation and system balance, multiple pumps need to be started and stopped in a specific sequence. The ground-based pump start-stop sequence signal can be generated through a control panel or switch in the ground control system. Generally, based on system requirements and operating status, the ground-based pump start-stop sequence signal is sent by pressing corresponding buttons or switches in a certain logical sequence. The ground-based pump start-stop sequence signal plays a crucial role in the hydraulic system, ensuring the correct start-stop sequence of hydraulic pumps, thereby effectively managing and controlling the supply and control of hydraulic power.

[0037] The downhole casing valve monitoring and control system provided in this application can control the downhole valves via surface pump start / stop sequence signals or by using electromagnetic induction at the drill bit. This allows for adjustment of the wellhead pressure, maintaining it below the formation pressure to achieve the goal of underbalanced drilling. The use of this downhole casing valve monitoring and control system can effectively control the risks of well kick and lost circulation during drilling, and improve drilling efficiency and safety. By controlling the opening and closing of the valves, the wellhead pressure can be regulated, ensuring that the bottomhole pressure is always greater than the wellhead pressure, thereby avoiding potential accidents.

[0038] The downhole casing valve monitoring and control system provided in this application mainly consists of a casing body 1, a motor 20 and a pump-valve assembly, a hydraulically controlled solenoid valve assembly, a hydraulically controlled return solenoid valve assembly, a battery and its cover plate, a circuit and its cover plate, a power connector 10 and its cover plate, a piston 5 for driving the valve plate, and a piston limiting sleeve 6, etc. Figure 1 The hydraulic control system 2 is composed of the motor 20 pump valve assembly, the hydraulically controlled drive solenoid valve assembly, the hydraulically controlled return oil solenoid valve assembly, and the balance piston oil bladder assembly 12. The hydraulic control system 2 is the main component of the downhole casing valve monitoring and control system provided in this application.

[0039] The downhole casing valve monitoring and control system provided in this application includes a motor 20, a hydraulic pump 19, and an overflow valve assembly. (See [reference needed]). Figure 4The motor 20 is connected to the hydraulic pump 19. The inlet end of the hydraulic pump 19 is connected to the oil tank 24. The outlet end of the hydraulic pump 19 is connected to the oil tank 24 through the overflow valve group. The overflow valve group includes an overflow valve and a safety valve 22 arranged in parallel.

[0040] To achieve automatic control, the motor 20 is connected to the processor 25 of the control device via a high-pressure sealed connector 23. The processor 25 contains an instruction receiving and motor 20 control circuit module. The control device also contains a power supply module 27, a communication module 28, an instruction receiving module 29, an output control module 30, a clock module 31, a storage module 32, etc., which are respectively connected to the signals of the instruction receiving and motor 20 control circuit module.

[0041] See also Figure 4 The processor 25 is connected to four two-position two-way solenoid valves via a high-pressure sealed connector 23 to realize electrical control of the four two-position two-way solenoid valves, thereby realizing the control of the hydraulic oil circuit opening and closing and the direction control, and finally realizing the valve plate opening and closing control by pushing the piston 5 through the hydraulic oil.

[0042] The valve plate is connected to the piston 5. Under the action of high pressure oil, the piston 5 can reciprocate along the axis of the casing body 1. Therefore, one end of the casing valve forms a high pressure oil inlet 13, and the other end forms a return oil port 14.

[0043] Of the four two-position two-way solenoid valves mentioned above, two two-position two-way solenoid valves constitute a hydraulically controlled solenoid valve assembly. If these two two-position two-way solenoid valves are respectively referred to as the first solenoid valve 15 and the second solenoid valve 16, then: the inlet end of the first solenoid valve 15 is connected to the outlet end of the hydraulic pump 19, and the outlet end of the first solenoid valve 15 is not only connected to the inlet end of the second solenoid valve 16, but also connected to the high-pressure oil inlet 13; the outlet end of the second solenoid valve 16 is connected to the oil tank 24.

[0044] The other two two-position two-way solenoid valves constitute the hydraulic return solenoid valve assembly. If these two two-position two-way solenoid valves are respectively referred to as the third solenoid valve 17 and the fourth solenoid valve 18, then: the inlet end of the third solenoid valve 17 is connected to the outlet end of the hydraulic pump 19, the outlet end of the third solenoid valve 17 is not only connected to the return port 14, but also connected to the inlet end of the fourth solenoid valve 18, and the outlet end of the fourth solenoid valve 18 is connected to the oil tank 24.

[0045] See Figure 5The circuit structure of the downhole casing valve monitoring and control system provided in this application can be briefly described as follows: Battery pack 11 is connected to power connector 10, which can be a CN-2E-TT6 Remo plug, with 6 cables on the Remo plug shown in the figure; two different interfaces J1 and J2 are formed in the electromagnetic induction coil 9 circuit, where J1 represents the control signal input interface of the coil circuit and J2 represents the control signal output interface. Power connector 10 is connected to processor 25 (CPU) via RS485 bus. Processor 25 controls the start and stop of motor 20 through motor 20 drive module, which is connected to electromagnetic induction coil 9 circuit and also to power connector 10. Processor 25 is connected to clock module 31, vibration switch module, storage module 32, A / D conversion module and four 2-position 2-way solenoid valves. Motor 20 is connected to other equipment via high-pressure sealing connector 23, which can be an 8-pin high-pressure sealing plug, such as... Figure 5 It has 8 cables.

[0046] The downhole casing valve monitoring and control system provided in this application, during use, triggers the downhole circuit to control the rotation of motor 20 of the pump-valve assembly via a surface pump start / stop sequence or electromagnetic induction. Then, hydraulic pump 19 generates high-pressure oil. This high-pressure oil passes through a hydraulically controlled solenoid valve assembly. By controlling the opening and closing of the solenoid valve, the high-pressure oil is delivered to one end of piston 5, driving piston 5 to move. The other end of the oil path returns to the balance piston oil bladder assembly 12 via a hydraulically controlled return oil solenoid valve assembly. In a specific application example, the system uses a battery pack 11 (DC28V, 11Ah) connected in parallel for power supply. A suitable battery is selected based on the system's operating time requirements, the rated current of motor 20, and the structural dimensions.

[0047] The aforementioned surface pump start-stop sequence refers to the process of controlling wellhead pressure on the surface by starting and stopping different pumps in a specific order to achieve pressure regulation. This pump start-stop sequence signal triggers circuit component 7 in the downhole casing valve monitoring and control system. Circuit component 7 then controls the hydraulic control system 2 to push piston 5 to open and close the valve plate. The specific configuration and operation mode of the surface pump sequence can be designed according to specific drilling needs and geological conditions. It needs to take into account factors such as the properties of drilling fluid, well depth, wellbore diameter, and formation type to ensure the safety and effectiveness of downhole underbalanced drilling.

[0048] The aforementioned electromagnetic induction method refers to using electromagnetic induction at the drill bit to control downhole valves. In the specific installation process, an electromagnetic sensor can be installed at a suitable location near the drill bit to detect and sense the status of the downhole valve. The bidirectional solenoid valve control component 3 in the downhole casing valve monitoring and control system opens and closes according to external signals. The electromagnetic sensor at the drill bit is connected to the surface control system. The surface control system receives the sensor signal from the drill bit and sends control signals to the bidirectional solenoid valve control component 3 downhole as needed, thereby realizing the opening and closing control of the valve plate. During operation, the sensor can continuously monitor the status of the downhole valve and transmit feedback information back to the surface control system to ensure accurate control and regulation. Through the above steps, the electromagnetic induction sensor at the drill bit can sense the status of the downhole valve and transmit the information to the surface control system. The surface control system, based on the received signal, uses an electromagnetic control device to open or close the downhole valve, thereby achieving control of the downhole valve. The electromagnetic induction coil 9 circuit in this application can perform decoding, amplification, and filtering operations based on the signal provided by the electromagnetic sensor to obtain more accurate measurement results.

[0049] The structure of the downhole casing valve monitoring and control system provided in this application is described in detail below.

[0050] The downhole casing valve monitoring and control system provided in this application includes a casing body 1, a piston 5 for driving the valve plate is provided inside the casing body 1, a chamber for filling hydraulic oil is formed between the piston 5 and the inner wall of the casing body 1, the chamber can be divided into an oil inlet chamber and an oil return chamber, the oil inlet chamber and the oil return chamber are respectively connected to the hydraulic control system 2; a piston limiting sleeve 6 is installed at one end of the piston 5, and the piston limiting sleeve 6 is installed on the inner wall of the casing body 1.

[0051] A receiving cavity is formed in the side wall of the casing body 1. A hydraulic control system 2 and a bidirectional solenoid valve control assembly 3 connected to the hydraulic control system 2 are installed within the receiving cavity. The bidirectional solenoid valve control assembly 3 includes a hydraulically controlled drive solenoid valve assembly and a hydraulically controlled return solenoid valve assembly. A circuit assembly 7 and an electromagnetic induction coil 9 are also installed within the receiving cavity, and a sealing cover plate 8 is provided on the receiving cavity. See also... Figure 1 The circuit assembly 7 and the electromagnetic induction coil 9 are sealed in the receiving cavity by a circuit cover plate, which is provided with a sealing structure.

[0052] A battery pack 11, a power connector 10, and a balance piston oil bladder assembly 12 are also provided in the receiving cavity opened on the side wall of the casing body 1. The power connector 10 is equipped with a cover plate.

[0053] The balancing piston bladder assembly 12 used in this application is a device for realizing the movement of a balancing piston 5 in a hydraulic or pneumatic system. It consists of a piston 5, an oil bladder, and related connecting pipes and control components. Its general structure may include two interconnected oil bladders, each with a piston 5. The two pistons 5 are connected by a connecting pipe and connected to working fluid or gas supply interfaces on both sides. When no force or pressure is applied to the oil bladder, the two pistons 5 are in a balanced state, and the liquid or gas in the connecting pipe is stationary. When force or pressure is applied to one piston 5, that piston 5 moves in the corresponding direction, pushing the liquid or gas to the other side of the connecting pipe. Due to the existence of the connecting pipe, liquid or gas moves from one piston 5 to the other, keeping the two pistons 5 balanced. This prevents unbalanced conditions in the hydraulic or pneumatic system, improving system stability and efficiency.

[0054] When the downhole casing valve monitoring and control system provided in this application is triggered, the motor 20 in the motor 20 pump-valve assembly rotates, and the hydraulic pump 19 starts working. It provides high-pressure oil through a traction or drive mechanism. In the hydraulic control system 2, the high-pressure oil flowing through the hydraulically controlled solenoid valve assembly is controlled according to the opening and closing state of the solenoid valve. By controlling the opening and closing state of the solenoid valve, the high-pressure oil can be delivered to one end of the piston 5, thereby applying force to move the piston 5, that is, drive the valve plate to move. The piston 5 is driven to move under the action of hydraulic pressure, while the other side of the system will return the oil to the balance piston oil bladder assembly 12 through the hydraulically controlled return oil solenoid valve assembly. That is, by controlling the opening and closing state of the solenoid valve, the flow of high-pressure oil is controlled, thereby achieving precise control of the piston 5.

[0055] In summary, the downhole casing valve monitoring and control system provided in this application has two valve opening and closing triggering methods. By combining pump start / stop and electromagnetic induction, the triggering success rate is improved. This application realizes the opening and closing of the valve through a hydraulic control system, which is not limited by the performance of the surface mud pump or the pressure of the bottom hole fluid column. It solves the problem that it is difficult to realize the valve opening and closing using mud pressure in the traditional method. In addition, the battery pack and power connector in the casing body solve the problem of long-term power supply at the bottom hole.

[0056] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0057] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A downhole casing valve monitoring and control system, characterized in that, The casing includes a casing body, in which a piston for driving a valve plate is disposed, and the piston and the inner wall of the casing body form a hydraulic oil chamber; a receiving cavity is formed on the side wall of the casing body, and a hydraulic control system and circuit components are disposed in the receiving cavity, and a sealing cover is provided at the opening of the receiving cavity. The hydraulic control system includes a motor-pump-valve assembly, a hydraulically controlled drive solenoid valve assembly, a hydraulically controlled return solenoid valve assembly, a balance piston oil bladder assembly, and an oil tank; the motor-pump-valve assembly includes a motor and a hydraulic pump connected to the motor; the hydraulically controlled drive solenoid valve assembly is connected to the hydraulic pump oil circuit and is signal-connected to the circuit assembly; the hydraulically controlled return solenoid valve assembly is signal-connected to the circuit assembly and is oil-connected to the balance piston oil bladder assembly. The circuit assembly includes a battery pack, a power connector, a processor, a motor drive module, an electromagnetic induction coil, and a vibration sensor. The electromagnetic induction coil and the ground pump start / stop sequence signal are respectively connected to the hydraulic control system signal. The ground pump start / stop sequence signal triggers the hydraulic control system to push the piston to open and close the valve plate. The induced signal of the electromagnetic induction coil triggers the hydraulic control system to push the piston to open and close the valve plate. The circuit assembly is connected to the ground control system signal, and the ground control system outputs the ground pump start / stop sequence signal to the circuit assembly. The electromagnetic induction coil is connected to the electromagnetic sensor installed at the drill bit. When the electromagnetic sensor detects a change in the surrounding electromagnetic field, it sends a signal to the electromagnetic induction coil. After receiving the signal, the electromagnetic induction coil triggers the hydraulic control system.

2. The downhole casing valve monitoring and control system according to claim 1, characterized in that, One end of the piston is installed in the piston limiting sleeve, and the piston limiting sleeve is installed on the inner wall of the tube body; the piston moves back and forth along the hydraulic oil chamber under the action of hydraulic oil to open or close the valve plate. One end of the hydraulic oil chamber forms a high-pressure oil inlet, and the other end forms a return oil port; the hydraulic oil chamber is connected to the oil circuit of the hydraulic control system.

3. The downhole casing valve monitoring and control system according to claim 1, characterized in that, The motor pump valve assembly also includes a relief valve group. The inlet end of the hydraulic pump is connected to the oil tank, and the outlet end of the hydraulic pump is connected to the oil tank through the relief valve group. The relief valve group includes a relief valve and a safety valve arranged in parallel.

4. The downhole casing valve monitoring and control system according to claim 2, characterized in that, The hydraulically controlled solenoid valve assembly includes a first solenoid valve and a second solenoid valve. The inlet end of the first solenoid valve is connected to the outlet end of the hydraulic pump, the outlet end of the first solenoid valve is connected to the inlet end of the second solenoid valve and is also connected to the high-pressure oil inlet, and the outlet end of the second solenoid valve is connected to the oil tank. The hydraulic return solenoid valve assembly includes a third solenoid valve and a fourth solenoid valve. The inlet end of the third solenoid valve is connected to the outlet end of the hydraulic pump, the outlet end of the third solenoid valve is connected to the return port and the inlet end of the fourth solenoid valve, and the outlet end of the fourth solenoid valve is connected to the oil tank.

5. The downhole casing valve monitoring and control system according to claim 1, characterized in that, The motor is connected to the processor via a high-pressure sealed connector; the processor is equipped with an instruction receiving and motor control circuit module, which is connected to the power supply module, communication module, instruction receiving module, output control module, clock module, and storage module respectively; The processor is signal-connected to the hydraulically controlled drive solenoid valve assembly and the hydraulically controlled return solenoid valve assembly. The processor controls the piston by controlling the movement of the hydraulically controlled drive solenoid valve assembly and the hydraulically controlled return solenoid valve assembly, thereby controlling the opening and closing of the valve plate.

6. The downhole casing valve monitoring and control system according to claim 1, characterized in that, The battery pack is connected to the power-on connector, which is connected to the processor. The processor controls the motor to start and stop via a motor drive module, which is connected to an electromagnetic induction coil. The processor is also signal-connected to the electromagnetic induction coil.

7. The downhole casing valve monitoring and control system according to claim 1, characterized in that, The sleeve body is a cylindrical structure, and the receiving cavity is a strip-shaped groove cavity opened along the axial direction of the sleeve body. The top of the strip-shaped groove cavity is sealed by the sealing cover plate. A cover plate for covering the electrical connector is provided on the outer wall of the sleeve body.

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