Wellhead device control device and control method

Abstract

The control device of the well head device aims at achieving accurate control over the state of a valve and is mainly characterized in that a control unit outputs rotating power to a hydraulic motor in a power transmission component, and the power transmission component converts the rotating power into linear reciprocating power; a power execution component drives a valve to be switched between an opening state and a closing state, a sensor of a position feedback system monitors the state of the valve and feeds back the state to a control unit, and the control unit automatically cuts off power output according to the state. According to the technical scheme, the control precision can be improved, and the problem that an opening and closing device of a high-pressure wellhead in the prior art is prone to being opened or closed not in place is solved.

Description

Technical Field

[0001] The present invention application relates to the technical field of oil and gas exploitation, in particular to a control device and a control method for a wellhead device. Background Art

[0002] During the exploitation process of oil and gas fields, the wellhead device is the core equipment for controlling operations such as gas production, water injection, and fracturing. The reliable opening and closing of its valves are directly related to production safety and efficiency. Currently, the driving forms of conventional and unconventional gas production / fracturing wellhead devices mostly adopt manual control, hydraulic cylinder control, and electric actuator control to control the opening and closing of the wellhead device valves. During the opening and closing process of the valves, it is impossible to timely control and observe whether the wellhead device valves are fully opened or closed. During the emergency shut-in process of ultra-high pressure wellhead devices, their opening and closing devices cannot quickly and effectively determine whether the wellhead device valves are fully closed or opened, resulting in the wellhead device not being opened or closed in place, and it is easy to cause the risk of the wellhead device getting out of control. In view of the limitations of the existing ultra-high pressure wellhead devices in the prior art, there is an urgent need for a new technical solution to solve the problem that the opening and closing devices of high-pressure wellheads in the prior art are prone to incomplete opening or closing. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention application proposes a control device for a wellhead device to solve the problem that the opening and closing devices of high-pressure wellheads in the prior art are prone to incomplete opening or closing.

[0004] The above technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0005] A control device for a wellhead device proposed by the present invention application includes: a pressure-bearing main body assembly, the pressure-bearing main body assembly is provided with a fluid channel, and at least one valve for controlling the opening and closing of the channel port is configured on the fluid channel; a driving system, including a power transmission member and a power execution member; wherein, the input end of the power transmission member is connected to the control unit, and is used to receive the rotational power output by the control unit and convert the input rotational power into linear reciprocating power, and drive the valve to switch between the open state and the closed state through the power execution member; a position feedback system, including a sensor arranged on the opening and closing stroke path of the valve, and is used to detect the open or closed state of the valve; the control unit is respectively connected to the driving system and the position feedback system, and is used to control the power output and automatically cut off the power output supply according to the sensor feedback signal.

[0006] Further, the power transmission member includes a hydraulic motor, which is connected to a rotating member. One end of the rotating member is provided with power teeth meshing with the hydraulic motor, and the other end is connected to a ball screw; the power execution member includes a valve plate, which has a through hole. Both ends of the valve plate are respectively connected to a valve rod and a tail rod; the ball screw is rotatably connected to the valve rod; the control unit is a hydraulic cabinet, which is used for hydraulic connection with the hydraulic motor; the hydraulic cabinet drives the hydraulic motor to rotate forward, drives the power teeth to rotate, and then drives the rotating member and the ball screw to rotate synchronously, so that the valve rod generates an axial linear motion, drives the valve plate and the tail rod to move axially synchronously until the through hole and the channel opening are coaxially corresponding, realizing the through-flow of the fluid, and the valve reaches the open state. At this time, the tail rod triggers the sensor, and the sensor sends a feedback signal to the hydraulic cabinet, and the hydraulic cabinet automatically cuts off the power supply of the hydraulic motor accordingly; when the hydraulic cabinet drives the hydraulic motor to rotate reversely, drives the power teeth to rotate, and then drives the rotating member and the ball screw to rotate reversely synchronously, so that the valve rod generates an axial linear motion, drives the valve plate and the tail rod to move axially reversely synchronously until the through hole and the channel opening are completely misaligned, blocking the fluid passage, and the valve reaches the closed state. At this time, the tail rod triggers the sensor, and the sensor sends a feedback signal to the hydraulic cabinet, and the hydraulic cabinet automatically cuts off the power supply of the hydraulic motor accordingly.

[0007] Further, one side of the valve plate facing the channel opening has a valve seat. When the valve plate axially moves to a state where the through hole and the channel opening are coaxially corresponding, the valve plate, the valve seat, and the channel opening form a sealing pair.

[0008] Further, both ends of the valve plate are respectively provided with connecting grooves; the valve rod and the tail rod respectively have connecting heads and are respectively connected to the connecting grooves at both ends of the valve plate through the connecting heads.

[0009] Further, the sensor includes an opening stroke sensor and a closing stroke sensor; when the tail rod touches the opening stroke sensor, the opening stroke sensor sends a feedback opening signal to the hydraulic cabinet, so that the hydraulic cabinet displays the open state of the valve, and the cabinet automatically cuts off the power supply of the hydraulic motor accordingly; when the tail rod touches the closing stroke sensor, the closing stroke sensor sends a feedback closing signal to the hydraulic cabinet, so that the hydraulic cabinet displays the closed state of the valve, and the cabinet automatically cuts off the power supply of the hydraulic motor accordingly.

[0010] Further, the hydraulic cabinet includes a plurality of independent oil circuit control modules, each oil circuit control module corresponds to one of the valves, and each oil circuit control module is provided with an independent solenoid valve; the oil circuit control module and the solenoid valve are both electrically connected to a control circuit; the control circuit can receive a unified valve opening and closing instruction set, and according to the valve number corresponding to each instruction in the instruction set, control the solenoid valve of the corresponding oil circuit control module to change direction, and at the same time provide hydraulic power to the corresponding hydraulic motor to drive a plurality of valves to open or close synchronously or in a preset order; during the opening and closing process of each valve, when the tail rod triggers the corresponding travel sensor, the corresponding oil circuit control module controls the solenoid valve of the valve to change direction according to the feedback signal, and cuts off the power supply of the hydraulic motor corresponding to the valve, so as to realize the control of a plurality of valves.

[0011] Further, the rated pressure of the pressure-bearing main body assembly is below 207 MPa.

[0012] In addition, a control method for a control device of a wellhead device is proposed, which is applied to the control device of the wellhead device described above. The method includes the following steps: the control unit receives a valve opening and closing instruction, controls the oil tank to output hydraulic oil, and transmits the hydraulic power to the hydraulic motor in the power transmission member through a hydraulic pipeline; the hydraulic motor rotates, drives the power gear and the ball screw to move in sequence, and the ball screw converts the rotational motion into linear power to drive the valve plate in the power execution member to move; when the valve plate drives the tail rod to move to trigger the travel sensor, the travel sensor transmits an electrical signal to the control unit, and the control unit controls the solenoid valve to change direction according to the signal, and stops the oil tank from outputting hydraulic oil, so as to complete the automatic identification and control of the valve opening and closing state.

[0013] Further, the control method for the control device of the wellhead device further includes the following steps: receiving and parsing a collaborative valve opening and closing instruction set, identifying the target valve numbers specified in each instruction and the action types regarding valve opening or closing; according to the parsing result, synchronously activating a plurality of oil circuit control modules, and driving the hydraulic motors with corresponding numbers to operate by controlling the solenoid valves of each module to change direction; each hydraulic motor drives the corresponding valve plate to move, so as to realize the collaborative operation of multiple valves; monitoring the signals of the travel sensors in real time, and when the tail rod of any valve triggers the travel sensor, cutting off the power supply of the hydraulic motor corresponding to the valve to keep the oil circuits of other valves working properly.

[0014] Further, the valve opening and closing instruction includes a local control handle operation instruction or a remote instruction received by a remote control module.

[0015] The technical effects achieved by this technical solution are:

[0016] The control device for a wellhead device provided by this invention application aims to solve the problem of precise control of the valve state. Specifically, the control unit outputs rotational power to the hydraulic motor in the power transmission member, which converts it into linear reciprocating power. The power execution member drives the valve to switch between the open and closed states. The sensor of the position feedback system monitors the valve state and feeds it back to the control unit, based on which the control unit automatically cuts off the power output. This technical solution can improve the control accuracy to solve the problem that the opening and closing devices of high-pressure wellheads in the prior art are prone to incomplete opening or closing. Description of the Drawings

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] One or more embodiments are illustrated by way of example in the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0020] Figure 1 Structural schematic diagram of the control device for a wellhead device of this application;

[0021] Figure 2 Structural schematic diagram of the drive system of Embodiment 1 of this application;

[0022] Figure 3 Schematic diagram of the state when the valve of Embodiment 1 of this application is open;

[0023] Figure 4 Schematic diagram of the state when the valve of Embodiment 1 of this application is closed;

[0024] Figure 5 Structural schematic diagram of the state when the valve of Embodiment 2 of this application is open;

[0025] Figure 6 Structural schematic diagram of the state when the valve of Embodiment 2 of this application is closed;

[0026] Figure 7 Structural schematic diagram of the power execution member of Embodiment 2 of this application;

[0027] Figure 8 Schematic diagram of the circuit structure of the internal control unit of the hydraulic cabinet in this application;

[0028] Figure 9 In this application Figure 1 Enlarged schematic diagram of button 8;

[0029] Figure 10 Schematic diagram of the single-valve collaborative control steps in this application;

[0030] Figure 11 Schematic diagram of the multi-valve collaborative control steps in this application;

[0031] Explanation of reference numerals in the drawings:

[0032] 1. Pressure-bearing main body assembly; 11. Tubing head; 12. Fracture tree; 13. Fluid channel; 131. Channel opening; 2. Valve; 3. Driving system; 31. Hydraulic motor; 32. Power transmission member; 321. Power tooth; 322. Rotating member; 323. Ball screw; 33. Power execution member; 331. Valve plate; 3311. Through hole; 3312. Connecting groove; 332. Valve rod; 333. Tail rod; 334. Connecting head; 4. Control unit; 41. Hydraulic cabinet; 411. Oil circuit control module; 412. Solenoid valve; 413. Control circuit; 5. Position feedback system; 51. Sensor; 511. Opening stroke sensor; 512. Closing stroke sensor; 61. Motor; 611. Output end; 62. Communication device; 63. Bevel gear; 64. Baffle; 641. Serrated part; 642. Connecting rod; 7. Valve seat; 8 - Button; 9. Fuel tank. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0034] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0035] In the wellhead control device in the prior art, since its opening and closing device cannot quickly and effectively determine whether the valve of the wellhead device is fully closed or opened, the opening or closing of the wellhead device is not in place, and there is a risk of the wellhead device getting out of control. Therefore, the present inventor provides a new technical solution to solve the problem that the opening and closing device of the high-pressure wellhead in the prior art is prone to incomplete opening or closing.

[0036] Specifically, as Figure 1 , Figure 5 and Figure 6 show, a control device for a wellhead device of the present technical solution includes: a pressure-bearing main body assembly 1, the pressure-bearing main body assembly 1 is provided with a fluid passage 13, and at least one valve 2 for controlling the opening and closing of the passage opening is arranged on the fluid passage 13; a drive system 3, including a power transmission member 32 and a power execution member 33; wherein, the input end of the power transmission member 32 is connected to the control unit 4, for receiving the rotational power output by the control unit 4 and converting the input rotational power into linear reciprocating power, and driving the valve 2 to switch between the open state and the closed state through the power execution member 33; a position feedback system 5, including a sensor 51 arranged on the stroke path of the valve opening and closing, for detecting the open or closed state of the valve 2; the control unit 4 is respectively connected to the drive system 3 and the position feedback system 5, for controlling the power output and automatically cutting off the power output supply according to the feedback signal of the sensor 51.

[0037] During use, the control unit 4 controls the power transmission member 32 by controlling the connection or disconnection of its internal circuit, so as to provide power or not provide power to the power transmission member 32, and further control the rotation or non-rotation of the power transmission member 32.

[0038] When the power transmission member 32 rotates, the power transmission member 32 converts the rotational power into the linear reciprocating power of the power execution member 33 to achieve the purpose of opening or closing the valve 2, and the specific state of the valve 2 is fed back to the control unit 4 by the sensor 51 for both the open or closed state of the valve 2, so as to achieve the purpose of accurately monitoring the opening or closing of the valve 2, and the control unit 4 can also automatically cut off the power output supply to the power transmission member 32 according to the state information of the valve 2 being closed or opened fed back by the sensor 51, thereby effectively solving the problem that the traditional high-pressure wellhead valve 2 is prone to incomplete opening or closing. Compared with the traditional technology, the present invention has significant precision advantages and is particularly suitable for industrial fields with strict requirements for high-pressure fluid control such as oil and gas exploitation, chemical pipelines, and nuclear power systems.

[0039] Embodiment 1

[0040] As shown Figure 1 in the figure, the pressure-bearing main body assembly 1 includes a tubing head 11 and a frac tree 12. Both the tubing head 11 and the frac tree 12 are hollow inside, and the hollow parts enclose the fluid passage 13. The fluid passage 13 is used for natural gas or petroleum liquid to pass through. A valve 2 is provided on each fluid passage 13. The valve 2 is used to open or close the fluid passage 13 to achieve the circulation or blockage of natural gas or petroleum liquid.

[0041] In one embodiment, as shown Figure 2 and Figure 3 in the figure, the power transmission member 32 includes a motor 61 and a communication device 62. The motor 61 is electrically connected to the communication device 62. The communication device 62 is communicatively connected to the control unit 4 to receive a driving instruction.

[0042] The power execution member 33 includes a bevel gear 63 and a baffle 64 meshed with the bevel gear. The power access end of the bevel gear 63 is connected to the power output end 611 of the motor 61.

[0043] One end of the baffle 64 has a serrated portion 641 which is meshed with the bevel gear 63. The other end of the baffle has a connecting rod 642 which is in contact connection with the sensor 51 of the position feedback system 5. The sensor 51 is communicatively connected to the control unit 4 to transmit an opening or closing signal to the control unit 4.

[0044] It should be noted that the communication device 62 can adopt a wireless receiving module, such as model HC-12, to communicate with the control unit 4 to obtain the driving signal sent by the control unit 4. It can also adopt a 4G communication module. With the support of the 4G network, it can establish a communication connection with a remote server (such as a computer), and then the remote server controls the control unit 4 to issue a control instruction.

[0045] The control unit 4 is the core of the control device of the entire wellhead device, responsible for processing various input signals and outputting control instructions according to a preset logic to achieve precise control of the valve 2. In this application, the hydraulic cabinet 41 is used as the main control unit carrier. The hydraulic cabinet 41 internally includes a control circuit 413, an oil circuit control module 411, and a solenoid valve 412, providing a stable working environment for the entire control unit 4.

[0046] During use, as shown Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, after the communication device 62 receives the driving signal from the control unit 4, it gives an execution signal to the motor 61, causing the motor 61 to rotate forward. For example, forward rotation corresponds to the opening of the valve 2, and reverse rotation corresponds to the closing of the valve 2.

[0047] For example, as Figure 3 shown, an arrow pointing to the right in the paper plane direction represents forward rotation, and an arrow pointing to the left represents reverse rotation. When the bevel gear 63 rotates forward driven by the output end 611 of the motor 61, the bevel gear 63 drives the baffle 64 engaged with it to move to the right, thereby exposing the orifice 131 of the fluid passage 13. And at this time, the connecting rod 642 on the other side of the baffle 64 touches the sensor 51 on the rightward rotation path. The sensor 51 feeds back a signal to the control unit 4. After receiving this feedback signal, the control unit 4 displays that the current valve 2 has been fully opened, and outputs a power cut-off signal to the communication device 62 at the motor 61 through its own communication device, so that the motor 61 stops rotating, and the baffle 64 no longer continues to advance to the right.

[0048] In another usage scenario, as Figure 4 shown, after the communication device 62 receives the driving signal from the control unit 4, it gives an execution signal to the motor 61, causing the motor 61 to rotate in reverse. For example, reverse rotation corresponds to the closing of the valve 2. Then, the bevel gear 63 is driven by the output end 611 of the motor 61 to rotate in reverse, so as to drive the baffle 64 engaged with it to rotate to the left as shown by the arrow, thereby covering the orifice 131 of the fluid passage 13. And at this time, the connecting rod 642 on the other side of the baffle 64 touches the sensor 51 on the leftward rotation path. The sensor feeds back a signal to the control unit 4. After receiving this feedback signal, the control unit 4 displays that the current valve 2 has been fully closed. The control unit 4 outputs a power cut-off signal to the communication device 62 at the motor 61 through its own communication device 62, so that the motor 61 stops rotating, and the baffle 64 no longer continues to rotate to the left and stays at the current position.

[0049] In summary, the opening or closing of the orifice 131 of the flow passage by the valve 2 is completed, and the control unit 4 can also quickly and effectively judge whether the wellhead device valve is fully closed or opened, avoiding the risk of the wellhead device being out of control due to the incomplete opening or closing of the wellhead device.

[0050] Embodiment 2

[0051] As Figure 5 andFigure 6 As shown, the power transmission member 32 includes a hydraulic motor 31. The hydraulic motor 31 is connected with a rotating member 322. One end of the rotating member 322 is provided with a power gear 321 meshing with the hydraulic motor 31, and the other end is connected with a ball screw 323. The ball screw 323 includes a nut and a sub-screw, and the nut is sleeved on the outer periphery of the sub-screw. The power execution member 33 includes a valve plate 331. The valve plate 331 has a through hole 3311. Both ends of the valve plate 331 are respectively connected with a valve rod 332 and a tail rod 333. The screw in the ball screw 323 is in screw connection with the valve rod 332. The control unit 4 is a hydraulic cabinet 41 for hydraulic connection with the hydraulic motor 31.

[0052] As Figure 5 shown, when the hydraulic cabinet 41 drives the hydraulic motor 31 to rotate forward, the output end of the hydraulic motor 31 is connected with the power gear 321. When the hydraulic motor 31 rotates, it drives the power gear 321 to rotate. The power gear 321 is meshingly connected with the rotating member 322. When the power gear 321 rotates, it drives the rotating member 322 and the ball screw 323 to rotate synchronously.

[0053] In this embodiment, the ball screw 323 includes a nut and a sub-screw. When the ball screw 323 works, its nut rotates around the sub-screw. Since the axial movement of the nut is restricted by the rotating member 322, the nut cannot perform linear movement in the axial direction and can only perform rotational movement at the original position. Then the sub-screw converts the rotational force of the nut into axial reciprocating movement. Since the sub-screw is in rotational connection with the valve rod 332, when the ball screw 323 rotates in place, the valve rod 332 converts the rotational movement of the entire ball screw 323 into linear reciprocating movement in the axial direction.

[0054] Since the other end of the valve rod 332 is connected with the valve plate 331, therefore, the valve rod 332 further drives the valve plate 331 and the tail rod 333 to move axially synchronously until the through hole 3311 and the channel port 131 are coaxially corresponding, realizing the through flow of fluid. The valve 2 reaches the open state. At this time, the tail rod 333 triggers the sensor 51, and the sensor 51 sends a feedback signal to the hydraulic cabinet 41. The hydraulic cabinet 41 automatically cuts off the power supply of the hydraulic motor 31 accordingly, indicating that the valve 2 has been opened in place.

[0055] As Figure 6As shown, when the hydraulic cabinet 41 drives the hydraulic motor 31 to rotate in the reverse direction, driving the power gear 321 to rotate, and then driving the rotating member 322 and the ball screw 323 to rotate synchronously in the reverse direction, the ball screw 323 is connected and cooperated with the valve stem 332 to convert the rotary motion into the axial linear motion of the valve stem 332, driving the valve plate 331 and the tail rod 333 to axially move synchronously in the reverse direction until the through hole 3311 is completely misaligned with the channel port 131, blocking the fluid passage, and the valve 2 reaches the closed state. At this time, the tail rod 333 triggers the sensor 51, and the sensor 51 sends a feedback signal to the hydraulic cabinet 41. The hydraulic cabinet 41 automatically cuts off the power supply of the hydraulic motor 31 accordingly, indicating that the current valve 2 has been closed in place.

[0056] In this technical solution, the control unit 4 in the hydraulic cabinet 41 drives the hydraulic motor 31 to rotate forward and backward. The power gear 321 meshed with the hydraulic motor 31 drives the rotating member 322 and the ball screw 323 to rotate synchronously. The ball screw 323 converts the rotational power into the axial linear motion of the valve stem 332, thereby driving the valve plate 331 and the tail rod 333 to move, realizing the opening or closing of the valve 2.

[0057] When the valve 2 is opened, the through hole 3311 of the valve plate 331 is coaxially corresponding to the channel port 131 to realize fluid communication. The tail rod 333 triggers the sensor 51, and the sensor 51 feeds back a signal to cut off the power of the hydraulic motor 31. When the valve 2 is closed, the through hole 3311 of the valve plate 331 is misaligned with the channel port 131 to block the fluid passage. Similarly, the tail rod 333 triggers the sensor 51 to feed back a signal to cut off the power. Thus, the precise control of the opening and closing of the valve 2 is realized, ensuring that the fluid passage 13 opens and closes as required, avoiding power waste and overoperation of the equipment. Through the feedback of the sensor 51, an automatic closed-loop control is realized, improving the reliability and control accuracy, and being able to quickly and effectively judge whether the wellhead device valve is completely closed or opened, avoiding the risk of the wellhead device being out of place when opening or closing, which is likely to cause the out-of-control of the wellhead device.

[0058] As Figure 5 and Figure 6 As shown, in a usage scenario of this embodiment, the side of the valve plate 331 facing the channel port 131 has a valve seat 7. When the valve plate 331 axially moves to a state where the through hole 3311 is coaxially corresponding to the channel port 131, the valve plate 331, the valve seat 7, and the channel port 131 form a sealing pair.

[0059] This technology aims to solve the problem of loose sealing and easy leakage at the connection of the fluid channel 13 when the valve is open by setting a valve seat 7 on the side of the valve plate 331 facing the channel opening 131. It should be understood that when the valve plate 331 is driven to move axially so that the through hole 3311 corresponds coaxially with the channel opening 131, the valve plate 331, the valve seat 7 and the channel opening 131 fit tightly together and cooperate with each other to form a sealing pair. The close contact between the three and the specific structural design are used to block the path of fluid leakage from the connection. In this way, the technical effect achieved is to significantly improve the sealing performance of the connection part of the fluid channel 13 when the valve 2 is opened, effectively prevent fluid leakage, ensure the stability and safety of fluid transportation, and reduce resource waste, environmental pollution and safety hazards caused by leakage.

[0060] like Figure 7 As shown, in one usage scenario of this embodiment, the valve plate 331 is provided with connecting grooves 3312 at both ends; the valve stem 332 and tail rod 333 each have a connector 334, and each of the connectors 334 engages with the connecting grooves 3312 at both ends of the valve plate 331 to form a connection. It should be understood that, for example, when the connector 334 at one end of the valve stem 332 is inserted into the connecting groove 3312, the friction at the connection prevents the connector 334 from falling out of the connecting groove 3312. Furthermore, when the valve stem 332 is rotated by the ball screw 323, the valve stem 332 can drive the valve plate 331 to synchronously generate axial linear motion.

[0061] In a specific embodiment, the connecting groove 3312 is a T-shaped groove, and the connecting head 334 is a T-shaped connector. It should be understood that the cooperation of the T-shaped structure enables the connection between the T-shaped groove and the T-shaped connector to generate mutually restraining friction forces in different directions, so that the connection between the valve stem 332 and the valve plate 331 is more secure and not easily separated.

[0062] The connection structure between the tail rod 333 and the valve plate 331 is the same as the connection structure and principle between the valve stem 332 and the valve plate 331 , and will not be elaborated here.

[0063] In one usage scenario of this embodiment, Figure 5 and Figure 6As shown, the sensor 51 includes an opening stroke sensor 511 and a closing stroke sensor 512; the opening stroke sensor 511 and the closing stroke sensor 512 are independent of each other and do not interfere with each other. They are used to transmit signals to the control unit 4. Touching parts matching the opening stroke sensor 511 and the closing stroke sensor 512 are respectively provided on the tail rod 333. When the tail rod 333 touches the opening stroke sensor 511, the corresponding touching part touches the opening stroke sensor 511 so that the opening stroke sensor 511 sends a feedback opening signal to the hydraulic cabinet 41. At this time, the hydraulic cabinet 41 displays the opening state of the valve 2, and the cabinet automatically cuts off the power supply of the hydraulic motor 31 accordingly; when the tail rod 333 touches the closing stroke sensor 512, its corresponding touching part touches the closing stroke sensor 512 to send a feedback closing signal to the hydraulic cabinet 41, so that the hydraulic cabinet 41 displays the closing state of the valve 2, and the cabinet automatically cuts off the power supply of the hydraulic motor 31 accordingly. It should be understood that in this embodiment, the opening stroke sensor 511 and the closing stroke sensor 512 are located on the same axis. Therefore, only when the corresponding touching part touches the corresponding stroke sensor, the sensor will generate a feedback signal, otherwise no feedback signal will be generated to the hydraulic cabinet 41.

[0064] In summary, the present invention effectively solves the technical problems existing in the traditional wellhead valve control, such as inaccurate monitoring of the valve state and difficulty in judging the action in place, by setting up a dual-sensor feedback system of the opening stroke sensor 511 and the closing stroke sensor 512. Its working principle is: when the valve 2 moves under the drive of the hydraulic motor 31, the tail rod 333 moves synchronously with the valve plate 331. When it reaches the fully open position, it triggers the opening stroke sensor 511, and when it reaches the fully closed position, it triggers the closing stroke sensor 512. The sensor immediately feeds back the status signal to the hydraulic cabinet 41. The control unit 4 immediately cuts off the power supply of the corresponding hydraulic motor 31 according to the received signal to ensure that the valve stops accurately at the preset position. This design ensures the absolute reliability of the valve 2 state feedback through mechanical contact triggering, avoids the problem that the valve 2 cannot be closed or opened in place in the prior art, and the real-time closed-loop control of the opening and closing actions of the valve 2 solves the problem of inaccurate positioning caused by hydraulic fluctuations or mechanical wear in the traditional technology.

[0065] As Figure 8 shown, in a usage scenario of this embodiment, the hydraulic cabinet 41 includes a control circuit 413. The control circuit 413 controls a plurality of oil circuit control modules 411. Each oil circuit control module 411 corresponds to one valve 2, and each oil circuit control module 411 is provided with an independent solenoid valve 412; the solenoid valve 412 is a two-way switch and has the function of opening or closing.

[0066] The control circuit 413 of the hydraulic cabinet 41 can receive all the opening and closing instruction sets of the valves 2, analyze the corresponding valve numbers of the valves 2 according to each instruction in the instruction set (this step can be implemented according to a preset program, for example, different voltages are set on the control circuits of each path of valves 2 for distinction), and then control the solenoid valves 412 of the corresponding oil circuit control modules 411 to reverse, and at the same time provide hydraulic power to the corresponding hydraulic motors 31 to drive multiple valves 2 to perform opening or closing actions; during the opening and closing process of each valve 2, when the tail rod 333 triggers the corresponding travel sensor 51, the corresponding oil circuit control module 411 controls the solenoid valve 412 of this valve 2 to reverse to the opening function or the closing function according to the feedback signal, so that the hydraulic oil returns to the fuel tank and no longer continues to flow to the hydraulic motor 31, so as to cut off the power supply to the hydraulic motor 31, and then realize that the current baffle 64 remains in the current position to ensure that the valve 2 is in the fully open or fully closed state.

[0067] For example, in this embodiment, as Figure 9 shown, there are multiple valves 2, namely the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve. Exclusive oil circuit control modules 411 and solenoid valves 412 are configured for each valve 2. The unified opening and closing instruction set is parsed by the control circuit 413, and each module is accurately scheduled to work according to the valve number; during the execution process, the hydraulic motors 31 of each valve 2 are independently controlled and do not interfere with each other. And when the tail rod 333 corresponding to any valve 2 triggers the travel sensor 51, the control circuit 413 controls the corresponding oil circuit control module 411, so that the corresponding oil circuit control module 411 controls the solenoid valve 412 to close, so that the hydraulic oil returns to the fuel tank and no longer supplies power to the hydraulic motor 31. Since each oil circuit control module 411 is independently controlled by the control circuit 413, each path of valves 2 can be independently controlled and does not affect each other. Of course, if the tail rod 333 does not trigger the travel sensor 51, the corresponding oil circuit control module 411 controls the solenoid valve 412 to open, so that the hydraulic oil continues to supply power to the hydraulic motor 31, so that the power execution member 33 continues to move until the tail rod 333 touches the travel sensor 51.

[0068] This technical solution solves the problem of pressure fluctuation interference existing in the traditional common oil circuit system; secondly, each valve 2 is independently controlled by the control circuit 413, so that the hydraulic cabinet 41 can realize independent control of multiple valves 2. In this technical solution, each valve 2 is independently controlled, so that when a single valve 2 fails or is maintained, it does not affect the overall operation of the system, significantly improving the control reliability and operation and maintenance convenience of large-scale wellhead devices, and is particularly suitable for ultra-high pressure oil and gas exploitation scenarios that require multiple valves to cooperate.

[0069] In a usage scenario of this embodiment, the rated pressure borne by the pressure-bearing main body assembly 1 is below 207 MPa, including 207 MPa and the pressure values below it. This technical solution is applicable to the high-pressure wellhead usage environment, effectively solving the key technical problems such as insufficient structural strength, seal failure, and high safety risks existing in traditional wellhead devices under ultra-high pressure conditions.

[0070] Embodiment Three

[0071] As Figure 10 and Figure 11 shown, a method for controlling a valve of a wellhead device, the method comprising the following steps:

[0072] S1: The control unit 4 receives a valve opening and closing instruction, controls the oil tank to output hydraulic oil, and transmits the hydraulic power to the hydraulic motor in the power transmission member through a hydraulic pipeline.

[0073] S2: The hydraulic motor rotates, driving the power gear 321 and the ball screw 323 to move in sequence. The rotation of the ball screw 323 causes the valve stem 332 assembled therein to convert the rotational motion into a linear power, driving the valve plate 331 in the power execution member 33 to move;

[0074] S3: When the valve plate drives the tail rod to move to trigger the travel sensor, the travel sensor transmits an electrical signal to the control unit 4, and the control unit 4 controls the solenoid valve 412 to change direction according to this signal, stopping the oil tank from outputting hydraulic oil, and completing the automatic identification and control of the valve opening and closing state.

[0075] The control method of the present invention realizes the high-precision intelligent control of the wellhead valve, and its working process is as follows: When the control unit 4 receives the opening and closing instruction of the valve 2, the reception of this instruction includes the local mode and the remote mode.

[0076] It should be noted that the local mode is the direct operation instruction of the local control handle. The remote mode is the remote instruction sent by the remote control module, and the system immediately starts the corresponding control program.

[0077] In the local control mode, the operator only needs to press the corresponding number button 8 of the target valve 2 on the operation panel of the hydraulic cabinet 41. Each button 8 corresponds to an opening direction and a closing direction, respectively corresponding to the states that need to be executed on the valve 2.

[0078] For example, when pressing the second valve in the opening direction, the hydraulic cabinet 41 will output a signal indicating the opening of the second valve to the control circuit 413. The control circuit 413 controls the oil circuit control module 411 corresponding to the second valve to open the corresponding solenoid valve 412, so that the oil tank is connected to the hydraulic motor 31 corresponding to this path of the second valve, thus enabling the oil tank to provide power for the hydraulic motor 31. After the hydraulic motor 31 obtains power, it rotates.

[0079] The rotational motion of the hydraulic motor 31 is transmitted to the rotating member 322 through the driving gear 321, and then drives the ball screw 323 to rotate around the outer periphery of the valve rod 332. Since the position of the ball screw 323 is axially fixed by the rotating member 322, this rotational motion is converted into an axial linear motion of the valve rod 332 through the ball screw pair. The valve plate 331 rigidly connected to the valve rod 332 moves synchronously therewith until the tail rod 333 touches the opening stroke sensor 511, which means that the current second valve is in the fully opened state. The opening stroke sensor 511 feeds back the information of the fully opened state to the control unit 4. The control unit 4 controls the oil circuit control module 411 to indirectly control the solenoid valve 412 to switch to the closed function, and the hydraulic oil returns to the oil tank 9, so that the hydraulic motor 31 no longer has power supply. At the same time, the power transmission member 32 and the power execution member 33 no longer move, so that the baffle 64 remains in the current position, which means that the current valve 2 has been fully opened.

[0080] For example, when pressing the second valve in the closing direction, the hydraulic cabinet 41 will output a signal indicating the closing of the second valve to the control circuit 413. The control circuit 413 controls the oil circuit control module 411 corresponding to the second valve to close the corresponding solenoid valve 412 and switch it to the open state to conduct the passage between the oil tank 9 and the hydraulic motor 31, so that the hydraulic motor 31 drives the power execution member 33 and the power transmission member 32 to move until the baffle 64 blocks the passage port 131 and the tail rod 333 touches the closing stroke sensor 512. The closing stroke sensor 512 feeds back a signal to the control unit 4. The control unit 4 controls the current oil circuit control module 41 to control the corresponding solenoid valve 412 to switch to the closed function to block the passage between the oil tank 9 and the corresponding hydraulic motor 31, thus realizing blocking the power supply from the oil tank to the hydraulic motor 31.

[0081] So that the hydraulic motor 31 no longer has power supply, and at the same time, the power transmission member 32 and the power execution member are no longer active, so that the baffle 64 remains in the current position, which means that the current valve 2 has been fully closed.

[0082] In another control scenario of multiple valves, such as Figure 7 andFigure 10 As shown, further, a control method for a control device of a wellhead device described above further includes the following steps:

[0083] S4: Receive a set of collaborative valve opening and closing commands and parse them to identify the target valve numbers specified in each command and the action types regarding valve opening or closing;

[0084] For example, on the outer surface of the hydraulic cabinet 41 in this embodiment, there are multiple buttons 8 as Figure 8 described. Each button 8 corresponds to controlling an oil circuit control module 411 to connect to the valve 2 in the corresponding wellhead device. The multiple oil circuit control modules 411 are connected in parallel with the control circuit 413 so that each oil circuit control module 411 is independently controlled by the control circuit 413 and does not interfere with each other.

[0085] In use, the control circuit 413 of the hydraulic cabinet 41 can receive all sets of valve 2 opening and closing commands. For example, it simultaneously receives operation commands from the buttons 8 corresponding to the fourth valve and the fifth valve. In this step, the control circuit 413 analyzes which specific numbered command it has received. For example, in this embodiment, there are a total of eight numbers. The control circuit 413 can, according to a preset program, such as different voltages corresponding to each number, determine which specific numbered operation command it has received. This step is prior art. By what method to determine which number it is, this method is not limited to voltage judgment and can also be other judgment methods, as long as it can conveniently determine which numbered button the command comes from. After determining which numbered button the control command corresponds to, it is also necessary to analyze which action type this control command corresponds to (this step can also be distinguished according to different powers corresponding to opening or closing). For example, if it is an opening action, it means that the valve 2 needs to be opened; if it is a closing action, it means that the valve 2 needs to be closed.

[0086] After step S4 is executed, step S5 is executed.

[0087] Step S5: According to the parsing result, synchronously activate multiple oil circuit control modules, and drive the hydraulic motors with corresponding numbers to operate by controlling the solenoid valve commutation of each module; each hydraulic motor drives the specified valve plate to move to achieve multi-valve collaborative operation;

[0088] S6: Real-time monitor the signals of the stroke sensors. When the tail rod of any valve triggers the stroke sensor, cut off the power supply of the hydraulic motor corresponding to that valve and keep the oil circuits of other valves working properly.

[0089] In use, for example, when the control circuit 413 receives the action instructions of the fourth valve and the fifth valve simultaneously. Since both the fourth valve and the fifth valve are controlled by the oil circuit control module 411 that is independently controlled by the control circuit 413. Therefore, the operation of the valves 2 corresponding to different numbers does not interfere with each other. And the control circuit 413 is connected in parallel with multiple oil circuit control modules 411 at the same time. Therefore, it can obtain the actions required to be executed on the corresponding oil circuit control module 411 according to the different access voltages of each path. When it is necessary to control the valves 2 with two numbers to perform the opening or closing actions simultaneously, the control circuit 413 controls the corresponding oil circuit control module 411 to execute the corresponding control instructions according to the requirements.

[0090] Specifically, each valve 2 has a corresponding button 8. After pressing the button 8: the button 8 moves in the opening direction, that is, pressing the "open" button → the control circuit 413 controls the oil circuit control module 411 to control the solenoid valve 412 to switch to the open position → the hydraulic oil flows to the hydraulic motor 31 → the hydraulic motor 31 drives the power transmission member 32 and the power execution member 33 to move so that the corresponding valve 2 opens until the corresponding tail rod 333 touches the opening stroke sensor 511, which means that it is currently opened in place. After the control unit 4 receives the information that it is opened in place, it controls the oil circuit control module 411 to indirectly control the solenoid valve 412 to switch to the closed function again to block the passage between the fuel tank 9 and the hydraulic motor 31, and the hydraulic oil returns to the fuel tank 9, so that the baffle 64 stays in the current position to maintain the state that the valve 2 is opened in place.

[0091] Moving the button 8 in the closing direction, that is, pressing the "close" button → the control circuit 413 controls the oil circuit control module 411 to control the solenoid valve 412 to switch to the open function → the hydraulic oil flows to the hydraulic motor 31 → the hydraulic motor 31 drives the power transmission member 32 and the power execution member 33 to move so that the corresponding valve 2 closes until the corresponding tail rod 333 touches the closing stroke sensor 512, which means that it is currently closed in place. After the control unit 4 receives the information that it is closed in place, it controls the oil circuit control module 411 to indirectly control the solenoid valve 412 to switch to the closed function again to block the passage between the fuel tank 9 and the hydraulic motor 31, and the hydraulic oil returns to the fuel tank 9. At this time, the hydraulic motor 31 loses power, so that the baffle 64 stays in the current position to maintain the state that the valve 2 is closed in place.

[0092] However, when the fourth valve and the fifth valve are opened simultaneously, for example, when the fourth valve reaches its position first → the solenoid valve 412 of the fourth valve is independently reversed to the closed function, blocking the passage between the fuel tank 9 and its hydraulic motor 31. The fifth valve continues to receive hydraulic power until it reaches its position, and then its solenoid valve 412 is reversed to the closed function again to block the passage between its hydraulic motor 31 and the fuel tank 9. This design enables multiple valves 2 to work together without interfering with each other.

[0093] The multi-valve collaborative control method for the wellhead control device provided by the present invention effectively solves the technical problems existing in the traditional multi-valve system, such as hydraulic interference, low collaborative efficiency, and complex control.

[0094] The control unit 4 first analyzes the collaborative instruction set to identify the valve numbers and action types of each valve; then synchronously activates the corresponding oil circuit control module 411, and drives the hydraulic motors 31 of each valve to operate through the independent solenoid valves 412. During the movement process, the system real-time monitors the signals of the stroke sensors 51 of each valve 2. When any valve 2 reaches the target position, the oil supply of its oil circuit is immediately cut off, while keeping other valves working continuously until all valves 2 complete their actions. Compared with the traditional technology, the present invention realizes multi-valve collaborative control and supports batch operations at the same time, which is especially suitable for the emergency shutdown and complex process control scenarios when multiple valves of a high-pressure wellhead need to be operated simultaneously and require quick response, significantly improving the reliability, automation level, and operation and maintenance efficiency of the system.

[0095] In summary, a control device for a wellhead device aims to solve the problem of precise control of the valve state. It mainly outputs rotational power from the control unit 4 to the hydraulic motor 31 in the power transmission member 32. The power transmission member 32 converts it into linear reciprocating power, and drives the valve 2 to switch between the open and closed states through the power execution member 33. The sensor 51 of the position feedback system monitors the state of the valve 2 and feeds it back to the control unit 4, and the control unit 4 automatically cuts off the power output accordingly. This technical solution can improve the control accuracy to solve the problem that the opening and closing devices of high-pressure wellheads in the prior art are prone to incomplete opening or closing.

[0096] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailedly described in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0097] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application 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, and therefore should not be construed as a limitation on the present application.

[0098] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0099] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring 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, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0100] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, provided that these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

[0101] The above is the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A control device for a wellhead device, characterized in that, Comprising: A pressure-bearing main body assembly provided with a fluid passage, on which at least one valve for controlling the opening and closing of the passage port is configured; A drive system including a power transmission member and a power execution member; Wherein, the input end of the power transmission member is connected to the control unit, configured to receive the rotational power output by the control unit, convert the input rotational power into linear reciprocating power, and drive the valve to switch between the open state and the closed state through the power execution member; A position feedback system including a sensor disposed on the opening and closing stroke path of the valve for detecting the open or closed state of the valve; The control unit is respectively connected to the drive system and the position feedback system, configured to control the power output and automatically cut off the power output supply according to the feedback signal of the sensor.

2. The control device of a wellhead device according to claim 1, characterized in that: The power transmission member includes a hydraulic motor, the hydraulic motor is connected with a rotating member, one end of the rotating member is provided with a power tooth meshing with the hydraulic motor, and the other end is connected with a ball screw; The power execution member includes a valve plate having a through hole, and the two ends of the valve plate are respectively connected with a valve stem and a tail rod; The ball screw is rotationally connected with the valve stem; The control unit is a hydraulic cabinet, configured to be hydraulically connected with the hydraulic motor; When the hydraulic cabinet drives the hydraulic motor to rotate forward, driving the power tooth to rotate, thereby driving the rotating member and the ball screw to rotate synchronously, causing the valve stem to generate an axial linear motion, driving the valve plate and the tail rod to move axially synchronously until the through hole and the passage port are coaxially corresponding, realizing the through flow of the fluid, and the valve reaches the open state. At this time, the tail rod triggers the sensor, and the sensor sends a feedback signal to the hydraulic cabinet, and the hydraulic cabinet automatically cuts off the power supply of the hydraulic motor accordingly; When the hydraulic cabinet drives the hydraulic motor to rotate reversely, driving the power tooth to rotate, thereby driving the rotating member and the ball screw to rotate reversely synchronously, causing the valve stem to generate an axial linear motion, driving the valve plate and the tail rod to move axially reversely synchronously until the through hole and the passage port are completely misaligned, blocking the fluid passage, and the valve reaches the closed state. At this time, the tail rod triggers the sensor, and the sensor sends a feedback signal to the hydraulic cabinet, and the hydraulic cabinet automatically cuts off the power supply of the hydraulic motor accordingly.

3. The control device of a wellhead device according to claim 2, characterized in that: One side of the valve plate facing the passage port has a valve seat. When the valve plate axially moves until the through hole and the passage port are coaxially corresponding, the valve plate, the valve seat and the passage port form a sealing pair.

4. The control device of a wellhead device according to claim 2, characterized in that: Both ends of the valve plate are respectively provided with connecting grooves; The valve stem and the tail rod respectively have connecting heads and are respectively connected with the connecting grooves at both ends of the valve plate through the connecting heads in a matching manner.

5. The control device of a wellhead device according to claim 2, characterized in that: The sensor includes an opening stroke sensor and a closing stroke sensor; When the tail rod touches the opening stroke sensor, the opening stroke sensor sends a feedback opening signal to the hydraulic cabinet, so that the hydraulic cabinet displays the opening state of the valve, and the cabinet automatically cuts off the power supply of the hydraulic motor accordingly; When the tail rod touches the closing stroke sensor, the closing stroke sensor sends a feedback closing signal to the hydraulic cabinet, so that the hydraulic cabinet displays the closing state of the valve, and the cabinet automatically cuts off the power supply of the hydraulic motor accordingly.

6. The control device of a wellhead device according to claim 2, wherein: The hydraulic cabinet includes a plurality of independent oil circuit control modules, each oil circuit control module corresponds to one of the valves, and each oil circuit control module is provided with an independent solenoid valve; The oil circuit control module and the solenoid valve are both electrically connected to the control circuit; The control circuit can receive a unified valve opening and closing instruction set, and according to the valve number corresponding to each instruction in the instruction set, control the solenoid valve of the corresponding oil circuit control module to change direction, and at the same time provide hydraulic power to the corresponding hydraulic motor to drive a plurality of valves to open or close synchronously or in a preset order; During the opening and closing process of each valve, when the tail rod triggers the corresponding stroke sensor, the corresponding oil circuit control module controls the solenoid valve of the valve to change direction according to the feedback signal, and cuts off the power supply of the hydraulic motor corresponding to the valve, realizing the control of a plurality of valves.

7. The control device of a wellhead device according to any one of claims 1-6, wherein: The rated pressure of the pressure-bearing main body assembly is below 207 MPa.

8. A control method for a control device of a wellhead device, characterized in that, The control device applied to the wellhead device according to any one of claims 1-6, the method comprises the following steps: The control unit receives a valve opening and closing instruction, controls the oil tank to output hydraulic oil, and transmits hydraulic power to the hydraulic motor in the power transmission member through a hydraulic pipeline; The hydraulic motor rotates, drives the power gear and the ball screw to move in sequence, and the ball screw converts the rotational motion into linear power to drive the valve plate in the power execution member to move; When the valve plate drives the tail rod to move to trigger the stroke sensor, the stroke sensor transmits an electrical signal to the control unit, and the control unit controls the solenoid valve to change direction according to the signal, and stops the oil tank from outputting hydraulic oil, completing the automatic identification and control of the valve opening and closing state.

9. The control method of a control device for a wellhead device according to claim 8, characterized in that It further comprises the following steps: Receiving and parsing a collaborative valve opening and closing instruction set, and identifying the target valve numbers specified in each instruction and the action types regarding valve opening or closing; According to the parsing result, synchronously activate a plurality of oil circuit control modules, and drive the corresponding numbered hydraulic motors to operate by controlling the solenoid valves of each module to change direction; Each hydraulic motor drives the corresponding valve plate to move, realizing the collaborative operation of multiple valves; Real-time monitor the signal of the stroke sensor. When the tail rod of any valve triggers the stroke sensor, cut off the power supply of the hydraulic motor corresponding to the valve and keep the oil circuits of other valves working normally.

10. The control method of a control device for a wellhead device according to claim 8, characterized in that: The valve opening and closing instruction includes a local control handle operation instruction or a remote instruction received by a remote control module.

Images