A control valve and an intelligent control system for an intermittent well using the control valve

Abstract

The present invention discloses a control valve, which includes a valve seat. A channel allowing the medium to flow is provided in the valve seat. Along the medium flow direction, a main valve body and a sub-valve body are successively arranged in the valve seat. The main valve body is used to fully open or fully close the channel, and the sub-valve body is used to adjust the opening degree of the channel. The sub-valve body is a slide plate capable of reciprocatingly moving in the radial direction of the channel. The surface of the slide plate is divided into an opening area and a non-opening area. By changing the positional relationship between the reciprocating slide plate's opening area and non-opening area and the channel, the opening degree of the channel can be adjusted. This control valve can ensure the pipeline pressure stability to a great extent to achieve normal production.

Description

Technical Field

[0001] The present invention relates to the technical field of gas field development, and particularly to a control valve and an intelligent control system for intermittent wells using the control valve. Background Art

[0002] With the large-scale development of gas fields, the productivity of gas wells gradually decreases, and low-yield gas wells cannot fully meet the production requirements due to their low output. In view of this situation, based on the analysis of existing production processes and technologies for low-yield gas wells at home and abroad, intermittent well switching is adopted to meet the production needs of low-yield gas wells. Intermittent well switching is a method that relies on the self-energy recovery of gas wells to achieve the purpose of liquid carrying and production resumption, and has become an essential measure for stable and increased production in the later stage of gas well production. When implementing this measure, valves need to be set to connect or block pipelines, and at the same time, valves are also needed to adjust the pressure in the pipelines to ensure the normal use of the pipelines.

[0003] Currently, valves mostly use electric intelligent throttle valves (needle valves), which drive the valve stem to act on the valve core through an electric actuator to open and close the valve and adjust the valve opening; however, this valve uses a direct-acting opening method, which causes a large opening torque, so a large-power drive is required to open the valve, resulting in high requirements for power. At the same time, the valve core of this valve is in the shape of a needle, with a small adjustable range and low pressure adjustment accuracy, and the valve type is angle type, and the valve core is severely eroded. If used for a long time, it will have a great impact on sealing. In actual operation, pneumatic diaphragm valves are also commonly used valves. They consist of a spring and a driving cylinder, and control the main spring by controlling the driving air source (pipeline medium) to push the cylinder to reciprocate, thereby acting on the valve core to open and close the valve and adjust the valve opening; because pneumatic diaphragm valves rely on pipeline media, situations such as pipeline liquid passing and pressure fluctuations sometimes occur, which will inevitably cause instability of the downstream pressure and cannot effectively protect the normal production of the pipeline. At the same time, its valve core is severely eroded, and long-term use will also have a great impact on sealing. In addition, in the prior art, globe valves are also used. When high-pressure gas passes through this valve, a large amount of energy is lost, the gas temperature drops suddenly, and icing may occur, which will affect the normal use of the valve.

[0004] In addition, for the above types of valves applied to on-site operations, in case of emergencies, such as abnormal pipeline pressure, they cannot handle it in time, which may cause some losses and affect normal production.

[0005] Therefore, how to provide a control valve that can avoid the above technical problems and ensure stable pipeline pressure to achieve normal production has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0006] The object of the present invention is to provide a control valve and an intelligent control system for an intermittent well using the control valve.

[0007] The present invention provides a control valve, including a valve seat. A channel allowing the medium to flow is provided in the valve seat. Along the medium flow direction, a main valve body and a sub-valve body are sequentially arranged in the valve seat. The main valve body is used to fully open or fully close the channel. The sub-valve body is used to adjust the opening degree of the channel. The sub-valve body is a slide plate capable of reciprocatingly moving along the radial direction of the channel. The surface of the slide plate is divided into an opening area and a non-opening area. By changing the positional relationship between the opening area and the non-opening area of the reciprocatingly moving slide plate and the channel, the opening degree of the channel can be adjusted.

[0008] Preferably, it further includes a sub-valve motor, a first gear, a second gear, a third gear and a lead screw. The lead screw is arranged in the valve seat. The lead screw is connected to the slide plate. A threaded portion is provided on the inner peripheral surface of the first gear. The threaded portion is sleeved on the lead screw and cooperates with the lead screw. The rotating first gear can drive the lead screw to reciprocatingly move along the radial direction of the channel. The first gear meshes with the second gear. The second gear meshes with the third gear. The output shaft of the sub-valve motor can drive the third gear to rotate.

[0009] Preferably, a friction disc is installed on the output shaft of the sub-valve motor. The friction disc rotates synchronously with the output shaft and the friction disc can move along the axis direction of the output shaft. Protrusions capable of cooperating with each other are provided on the opposite surfaces of the friction disc and the third gear. A spring is fixedly connected between the output shaft and the friction disc. When the spring is in a natural state, the friction disc can drive the third gear to rotate through the mutually cooperating protrusions. It further includes a sub-valve handwheel. The sub-valve handwheel includes a handwheel shaft and a handwheel installed at the first end of the handwheel shaft. A fixing plate is fixedly provided on the inner peripheral surface of the third gear. A non-circular hole is opened on the fixing plate. The handwheel shaft includes a non-circular shaft section that cooperates with the non-circular hole. The circular shaft section in contact with the non-circular shaft end and close to the friction disc can pass through the non-circular hole. When the handwheel is not pressed, the circular shaft section of the handwheel shaft is located in the non-circular hole and the friction wheel cooperates with the third gear. When the handwheel is pressed, the second end of the handwheel shaft can push the friction disc to disengage it from the third gear and the spring is compressed. At the same time, the non-circular shaft section of the handwheel shaft cooperates with the non-circular hole.

[0010] Preferably, it further includes an encoder. A fourth gear is installed at the output end of the encoder. The fourth gear meshes with the third gear.

[0011] Preferably, the threaded portion is a nut. The nut is fixedly installed on the inner peripheral surface of the first gear.

[0012] Preferably, the perforated area of the sliding plate includes a plurality of through holes penetrating the upper and lower surfaces of the sliding plate in a direction perpendicular to the surface of the sliding plate.

[0013] Preferably, it further includes a pull rod, a reset rod, a reset spring, a lock block and Gear Five. The pull rod and the reset rod are arranged in parallel and are both slidably connected to the valve seat. Gear Five is provided between the pull rod and the reset rod. Corresponding to Gear Five, racks are provided at one ends of the pull rod and the reset rod respectively. The rack of the pull rod meshes with Gear Five, and the rack of the reset rod meshes with Gear Five. A groove is formed on the pull rod, and the lock block can enter or slide out of the groove. The reset spring is sleeved on the reset rod, and a pressing member for pressing the reset spring is provided at the other end of the reset rod. One end of the reset spring contacts the pressing member and the other end of the reset spring is fixed on the valve seat. The gear shaft fixing Gear Five is connected to the main valve body. The upward movement of the pull rod drives Gear Five to rotate to fully open the main valve body and the lock block enters the groove. At the same time, the rotating Gear Five drives the reset rod to move downward to compress the reset spring. When the lock block slides out of the groove, the reset of the reset spring drives the reset rod to move upward to enable Gear Five to rotate to fully close the main valve body.

[0014] Preferably, it further includes a main valve motor, a cam and a lifting block. The cam is installed on the output shaft of the main valve motor, the lifting block is connected to the pull rod, and the cam cooperates with the lifting block and the rotating cam can drive the lifting block to move upward and further drive the pull rod to move upward.

[0015] Preferably, it further includes a cylinder, a piston, a pull ring, a rotating plate, a fixed shaft, a rocker and an electromagnetic assembly. The cylinder communicates with the downstream pipeline of the control valve. The piston is slidably connected in the cylinder. The piston is connected to the pull ring. The rotating plate is rotatably connected through the fixed shaft, and the fixed shaft is installed on the valve seat. One end of the rotating plate presses against one end of the rocker, and the other end of the rocker presses against the lock block. The medium entering the cylinder can pass through the piston, the pull ring, the rotating plate and the rocker to make the lock block enter the groove. The electromagnetic assembly cooperates with the rotating plate and the energized electromagnetic assembly can pull the rotating plate to make the lock block slide out of the groove.

[0016] Preferably, it further includes two overpressure springs. The first ends of the two overpressure springs are respectively connected to the surface of the piston facing away from the pull ring. The two overpressure springs are located in a large housing. The first end of the large housing is hermetically connected to the valve seat. The inner peripheral surface of the second end of the large housing is provided with threads. A large nut matching the threads is arranged inside the inner peripheral surface of the second end of the large housing. The second ends of the two overpressure springs respectively abut against the large nut. A small housing is arranged inside the large housing. It further includes an underpressure spring. The underpressure spring is located inside the small housing. The first end of the underpressure spring is connected to the surface of the piston facing away from the pull ring. A hole is provided in the large nut. The first end of the small housing is embedded in the hole. The inner peripheral surface of the first end of the small housing is provided with internal threads. It further includes a small nut matching the internal threads. The second end of the underpressure spring abuts against the small nut. The two overpressure springs are symmetrically arranged in the annular space between the large housing and the small housing. The compression amount of the two overpressure springs can be adjusted through the large nut. The compression amount of the underpressure spring can be adjusted through the small nut.

[0017] Preferably, it further includes a main valve handwheel. The main valve handwheel is in transmission cooperation with the fifth gear through a plurality of gears.

[0018] Preferably, a part of the channel upstream of the main valve body is arranged as a Venturi tube, and a part of the channel downstream of the main valve body is arranged as a Venturi tube. The Venturi tube includes an inlet cylinder section, a conical contraction section, a cylindrical throat section, and a conical diffusion section connected in sequence.

[0019] The control valve provided by the present invention has the following technical effects:

[0020] The control valve includes a main valve body, which can be used to fully open or fully close the channel of the control valve. At the same time, it further includes a sub-valve body in the form of a slide plate structure. The main valve body and the sub-valve body are used in combination. Specifically, when the pressure in the upstream pipeline reaches a certain value, the main valve body can be fully opened. At the same time, through the sub-valve body, that is, the movement of the slide plate, the opening degree of the channel is adjusted. As a pressure reducing valve, it has good pressure reducing effect and accurate adjustment accuracy, so that the pressure behind the valve always remains within the working pressure range of the pipeline, thereby ensuring the pressure stability of the downstream pipeline. The sub-valve body adopts the structure of a slide plate, which combines the advantages of traditional straight-through single-seat valves and butterfly valves, with stable control, large adjustable pressure difference, sensitive action, small size, convenient maintenance, excellent closing performance of the slide plate, eliminating the disadvantages of traditional control valves such as small differential pressure to overcome, difficult replacement of valve internals, and easy jamming. It can accurately and quickly control the flow rate of the medium, and is safer, more flexible and more reliable to use. In addition, if the pressure of the upstream pipeline and / or the downstream pipeline is abnormal, the channel can be quickly and fully closed through the main valve body to avoid further losses, and then the sub-valve body is also closed to achieve double protection.

[0021] Preferably, the movement of the skateboard is driven by common mechanical transmission components, which has a simple structure and is easy to implement and maintain.

[0022] Preferably, it further includes a sub-valve handwheel. At the same time, through the setting of components such as a friction disc and a spring, when the sub-valve motor malfunctions, the sub-valve body can be controlled by the sub-valve handwheel.

[0023] Preferably, it further includes an encoder to achieve more precise control of the opening degree of the sub-valve body.

[0024] Preferably, the opening or closing of the main valve body is achieved through the cooperation of a pull rod, a reset rod, a gear, and a return spring. These components are all common mechanical components, which are easy to manufacture and maintain.

[0025] Preferably, a lifting block is driven by a cam. When the cam lifts the lifting block to a certain height, the cam can provide space for the lifting block to move downward. The cam provides power for the upward movement of the lifting block and does not affect the downward movement of the lifting block.

[0026] Preferably, components such as an overpressure spring and an underpressure spring are provided in the cylinder. When the pressure in the downstream pipeline is abnormal, the main valve body can be driven by these components to cut off the passage emergently.

[0027] Preferably, it further includes a main valve handwheel. When the main valve motor malfunctions, the main valve body can be controlled by the main valve handwheel.

[0028] Preferably, part of the passage is provided with a Venturi tube to achieve throttling and pressure reduction.

[0029] The present invention also provides an intelligent control system for an intermittent well, which includes the control valve described above, and further includes a first pressure sensor placed in the downstream pipeline of the control valve for monitoring the pressure in the downstream pipeline and a second pressure sensor placed in the upstream pipeline of the control valve for monitoring the pressure in the upstream pipeline. It further includes a controller, and the controller is connected to the first pressure sensor, the second pressure sensor, and the control valve. The controller can control the sub-valve body according to the first pressure sensor, and the controller can control the main valve body according to the second pressure sensor.

[0030] Preferably, it further includes a pressure module, and the controller is connected to the pressure module. The pressure module is provided with a preset opening pressure and closing pressure. The controller can control the opening or closing of the control valve according to the pressure module and the pressure values monitored by the first pressure sensor and / or the second pressure sensor received.

[0031] Preferably, it further includes a timing module which sets the opening and closing times of the control valve. The timing module is connected to the controller, and the controller can control the opening or closing of the control valve according to the timing module.

[0032] An intermittent well intelligent control system provided by the present invention includes the above-mentioned control valve, so it has the same technical effects. At the same time, it can realize on-site and remote intermittent functions, which are more reliable and economical for increasing production and efficiency and ensuring safe production in low-yield gas fields. It has certain theoretical and application values for further increasing gas production, enriching the technical theory of valves, and broadening the market of R & D technologies. At the same time, it reduces the travel rate of personnel, saves costs, improves the utilization rate of natural gas wells, reduces the risks of on-site safe production, saves labor costs, and significantly improves economic benefits. With one-time investment, long-term benefits can be obtained. It greatly reduces the safety risks of wellhead workers and also achieves good results in optimizing labor organization and production management organization.

[0033] Preferably, the system can implement a pressure intermittent mode or a time intermittent mode for exploitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0035] Figure 1 It is a front view cross-sectional view of an embodiment of a control valve provided by the present invention;

[0036] Figure 2 It is a side view cross-sectional view of an embodiment of a control valve provided by the present invention;

[0037] Figure 3 It is Figure 1 a schematic structural diagram of the secondary valve body and related components in

[0038] Figure 4 It is a schematic structural diagram of the lock block sliding out of the groove under overpressure;

[0039] Figure 5 It is a schematic structural diagram of the lock block sliding out of the groove under underpressure;

[0040] Figure 6 It is a schematic structural diagram of a Venturi tube;

[0041] Figure 7Schematic structural diagram of an embodiment of an intelligent control system for an intermittent well provided by the present invention.

[0042] Figures 1-7 The reference numerals in the figure are as follows:

[0043] 1 valve seat, 2 channel, 3 main valve body, 4 slide plate, 41 opening area, 411 through hole, 42 non-opening area, 5 sub-valve motor, 6 gear one, 7 gear two, 8 gear three, 9 lead screw, 10 nut, 11 friction disc, 12 sub-valve handwheel, 121 handwheel shaft, 122 handwheel, 13 encoder, 14 gear four, 15 pull rod, 151 groove, 16 reset rod, 17 reset spring, 18 lock block, 19 gear five, 20 main valve motor, 21 cam, 22 lifting block, 23 cylinder, 24 piston, 25 pull ring, 26 rotating plate, 27 fixed shaft, 28 rocker plate, 29 overpressure spring, 30 large nut, 31 underpressure spring, 32 small nut, 33 main valve handwheel, 34 Venturi tube, 35 controller, 36 first pressure sensor, 37 second pressure sensor, 38 control valve, 39 timing module, 40 pressure module. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Refer to Figures 1-7 , Figure 1 Front view cross-sectional view of an embodiment of a control valve provided by the present invention;

[0046] Figure 2 Side view cross-sectional view of an embodiment of a control valve provided by the present invention;

[0047] Figure 3 For Figure 1 Schematic structural diagram of the sub-valve body and related components in

[0048] Figure 4 Schematic structural diagram of the lock block sliding out of the groove under overpressure;

[0049] Figure 5 Schematic structural diagram of the lock block sliding out of the groove under underpressure;

[0050] Figure 6 Schematic structural diagram of the Venturi tube;

[0051] Figure 7Schematic structural diagram of an embodiment of an intermittent well intelligent control system provided by the present invention.

[0052] As Figures 1-3 shown, the present invention provides a control valve. In one embodiment, it includes a valve seat 1. A channel 2 allowing the medium to flow is provided in the valve seat 1. Along the direction of the medium flow, a main valve body 3 and a sub-valve body are sequentially provided in the valve seat 1. The main valve body 3 is used to fully open or fully close the channel 2, and the sub-valve body is used to adjust the opening degree of the channel 2. The sub-valve body is a slide plate 4 that can reciprocate in the radial direction of the channel 2. The surface of the slide plate 4 is divided into an opening area 41 and a non-opening area 42. The reciprocating slide plate 4 can adjust the opening degree of the channel 2 by changing the positional relationship between its opening area 41 and non-opening area 42 and the channel 2.

[0053] In this embodiment, the channel 2 is a straight channel, but the specific structure of the valve seat 1 is not limited.

[0054] The main valve body 3 adopts the structure of a ball valve, but its power component is not limited. For example, a motor can be used and driven by a belt or a gear to drive the main valve body 3 to move to fully open or fully close the channel 2. It can be understood that there are only two situations for the position of the main valve body 3. One position can fully open the channel 2, and the other position can fully close the channel 2.

[0055] The sub-valve body is provided with an opening area 41 and a non-opening area 42. When the non-opening area 42 is placed in the channel 2, the sub-valve body fully closes the channel 2. When part or all of the opening area 41 is placed in the channel 2, it is to partially or fully open the channel 2.

[0056] The provided control valve includes a main valve body 3. The main valve body 3 can be used to fully open or fully close the channel 2 of the control valve. At the same time, it also includes a sub-valve body in the structure of a slide plate 4. The main valve body 3 and the sub-valve body are used in cooperation. Specifically, when the pressure in the upstream pipeline reaches a certain value, the main valve body 3 can be fully opened, and at the same time, the opening degree of the channel 2 is adjusted by the movement of the sub-valve body, that is, the slide plate 4. As a regulating pressure reducing valve, it has good pressure reducing effect and accurate regulation accuracy, so that the pressure behind the valve always remains within the working pressure range of the pipeline, thus ensuring the pressure stability of the downstream pipeline. The sub-valve body adopts the structure of a slide plate 4, which combines the advantages of traditional straight-through single-seat valves and butterfly valves, with stable control, large regulating pressure difference, sensitive action, small size, convenient maintenance, excellent closing performance of the slide plate, eliminating the disadvantages of traditional regulating valves such as small differential pressure to overcome, difficult replacement of valve internals, and easy jamming. It can accurately and quickly control the flow rate of the medium, and is safer, more flexible and more reliable to use. In addition, if the pressure of the upstream pipeline and / or the downstream pipeline is abnormal, the channel 2 can be quickly and fully closed by the main valve body 3 to avoid further losses, and then the sub-valve body is also closed to achieve double protection.

[0057] In another embodiment, in combination with Figures 1-3 , it further includes a sub-valve motor 5, a first gear 6, a second gear 7, a third gear 8 and a lead screw 9. The lead screw 9 is arranged in the valve seat 1. The lead screw 9 is connected to the slide plate 4. A threaded portion is provided on the inner peripheral surface of the first gear 6. The threaded portion is sleeved on the lead screw 9 and cooperates with the lead screw 9. The rotating first gear 6 can drive the lead screw 9 to reciprocate in the radial direction of the channel 2. The first gear 6 meshes with the second gear 7, the second gear 7 meshes with the third gear 8, and the output shaft of the sub-valve motor 5 can drive the third gear 8 to rotate.

[0058] In this embodiment, the movement of the slide plate 4 is driven by common mechanical transmission components, with a simple structure that is easy to implement and convenient to maintain.

[0059] In this embodiment, the second gear 7 is provided as an intermediate transmission gear to make the radius of the third gear 8 smaller, so that the above components can be smoothly covered by the valve cover. Of course, in other embodiments, the second gear 7 may not be included. For example, the third gear 8 can be directly meshed with the first gear 6.

[0060] In a preferred embodiment, a friction disc 11 is installed on the output shaft of the sub-valve motor 5. The friction disc 11 rotates synchronously with the output shaft and can move along the axis direction of the output shaft. Protrusions that can cooperate with each other are provided on the opposite surfaces of the friction disc 11 and the third gear 8. A spring (not shown in the drawings) is fixedly connected between the output shaft and the friction disc 11. When the spring is in its natural state, the friction disc 11 can drive the third gear 8 to rotate through the mutually cooperating protrusions. It further includes a sub-valve handwheel 12. The sub-valve handwheel 12 includes a handwheel shaft 121 and a handwheel 122 installed at the first end of the handwheel shaft 121. A fixing plate (not shown in the drawings) is fixedly provided on the inner peripheral surface of the third gear 8. A non-circular hole is opened on the fixing plate. The handwheel shaft 121 includes a non-circular shaft section that cooperates with the non-circular hole. The circular shaft section that contacts the non-circular shaft end and is close to the friction disc 11 can pass through the non-circular hole. When the handwheel 122 is not pressed, the circular shaft section of the handwheel shaft 121 is located in the non-circular hole and the friction wheel 11 cooperates with the third gear 8. When the handwheel 122 is pressed, the second end of the handwheel shaft 121 can push the friction disc 11 to disengage it from the third gear 8 and the spring is compressed. At the same time, the non-circular shaft section of the handwheel shaft 121 cooperates with the non-circular hole.

[0061] In this embodiment, when the sub-valve motor 5 malfunctions, the sub-valve body can be controlled through the sub-valve handwheel 12.

[0062] Such as Figures 1-3As shown, it further includes an encoder 13. A gear four 14 is installed at the output end of the encoder 13, and the gear four 14 meshes with the gear three 8.

[0063] The encoder 13 realizes higher-precision control of the opening degree of the auxiliary valve body.

[0064] In one embodiment, the threaded part selects a nut 10. Of course, it is not limited thereto.

[0065] In one embodiment, the opening area 41 of the slide plate 4 includes a plurality of through holes 411 that penetrate the upper and lower surfaces of the slide plate 4 along a direction perpendicular to the surface of the slide plate 4.

[0066] Furthermore, as Figures 1-7 shown, it further includes a pull rod 15, a return rod 16, a return spring 17, a lock block 18 and a gear five 19. The pull rod 15 and the return rod 16 are arranged in parallel and are both slidably connected to the valve seat 1. A gear five 19 is provided between the pull rod 15 and the return rod 16. Corresponding to the gear five 19, racks are provided at one ends of the pull rod 15 and the return rod 16. The rack of the pull rod 15 meshes with the gear five 19, and the rack of the return rod 16 meshes with the gear five 19. A groove 151 is formed in the pull rod 15, and the lock block 18 can enter or slide out of the groove 151. The return spring 17 is sleeved on the return rod 16, and a pressing member for pressing the return spring 17 is provided at the other end of the return rod 16. One end of the return spring 17 contacts the pressing member and the other end of the return spring 17 is fixed to the valve seat 1. The gear shaft fixing the gear five 19 is connected to the main valve body 3, that is, a ball valve. The upward movement of the pull rod 15 drives the rotation of the gear five 19 to fully open the main valve body 3 and the lock block 18 enters the groove 151. At the same time, the rotation of the gear five 19 drives the downward movement of the return rod 16 to compress the return spring 17. When the lock block 18 slides out of the groove 151, the reset of the return spring 17 drives the upward movement of the return rod 16 to rotate the gear five 19 to fully close the main valve body 3.

[0067] The opening or closing of the main valve body 3 is realized through the cooperation of the pull rod 15, the return rod 16, the gear five 19 and the return spring 17. These components are all common mechanical components, which are easy to manufacture and maintain.

[0068] In one embodiment, the power component for driving the main valve body 3 includes a main valve motor 20, a cam 21 and a lifting block 22. The cam 21 is installed on the output shaft of the main valve motor 20. The lifting block 22 is connected to the pull rod 15. The cam 21 cooperates with the lifting block 22 and the rotating cam 21 can drive the lifting block 22 to move upward and further drive the pull rod 15 to move upward.

[0069] The lifting block 22 is driven by the cam 21. When the cam 21 lifts the lifting block 22 to a certain height, the cam 21 can provide space for the lifting block 22 to move downward. The cam 21 provides power for the upward movement of the lifting block 22 and does not affect the downward movement of the lifting block 22. Of course, the power mechanism can also adopt gear transmission to drive the pull rod 15 to move, but at this time, a separating component needs to be equipped to enable the lifting block 22 to move downward smoothly.

[0070] Furthermore, it further includes a cylinder 23, a piston 24, a pull ring 25, a rotating plate 26, a fixed shaft 27, a seesaw 28 and an electromagnetic component. The cylinder 23 communicates with the downstream pipeline of the control valve. The piston 24 is slidably connected in the cylinder 23. The piston 24 is connected to the pull ring 25. The rotating plate 26 is rotatably connected to the fixed shaft 27. The fixed shaft 27 is installed on the valve seat 1. One end of the rotating plate 26 presses against one end of the seesaw 28. The other end of the seesaw 28 presses against the lock block 18. The medium entering the cylinder 23 can pass through the piston 24, the pull ring 25, the rotating plate 26 and the seesaw 28 to move the lock block 18 into the groove 151. The electromagnetic component is cooperated with the rotating plate 26, and the energized electromagnetic component can pull the rotating plate 26 to make the lock block 18 slide out of the groove 151.

[0071] It further includes two overpressure springs 29. The first ends of the two overpressure springs 29 are respectively connected to the side of the piston 24 facing away from the pull ring 25. The two overpressure springs 29 are located in a large housing. The first end of the large housing is hermetically connected to the valve seat 1. The inner peripheral surface of the second end of the large housing is provided with threads. A large nut 30 that cooperates with the threads is provided inside the inner peripheral surface of the second end of the large housing. The second ends of the two overpressure springs 29 respectively abut against the large nut 30. A small housing is provided inside the large housing. It further includes an underpressure spring 31. The underpressure spring 31 is located inside the small housing. The first end of the underpressure spring 31 is connected to the side of the piston 24 facing away from the pull ring 25. A hole is provided on the large nut 30. The first end of the small housing is embedded in the hole. The inner peripheral surface of the first end of the small housing is provided with internal threads. It further includes a small nut 32 that cooperates with the internal threads. The second end of the underpressure spring 31 abuts against the small nut 32. The two overpressure springs 29 are symmetrically arranged in the annular space between the large housing and the small housing. The compression amount of the two overpressure springs 29 can be adjusted by the large nut 30, and the compression amount of the underpressure spring 31 can be adjusted by the small nut 32.

[0072] Combined with Figure 4As shown, when an overpressure emergency occurs, the medium pushes the piston 24 in the cylinder 23 to compress the overpressure spring 29 and move leftward. The piston 24 drives the pull ring 25, and the pull ring 25 forces the rotating plate 26 to rotate leftward around the fixed shaft 27. The seesaw 28 loses support and cannot provide enough locking force to press the lock block 18. The lock block 18 disengages from the annular groove of the pull rod 15, and the self-locking mechanism is unlocked. Under the action of the return spring 17, the pull rod 15 moves downward, driving the ball to rotate 90° through the transmission assembly. The main valve body 3 closes the passage 2, completely isolating the wellhead from the export pipeline, and the sub-valve body also closes accordingly.

[0073] After an overpressure emergency cut-off occurs, the valve is in a fully closed state. The valve cylinder 23 is always connected to the production pipeline. In the case of continuous abnormal pipeline pressure, the valve implements in-situ protection. When the pipeline pressure returns to the normal production pressure, the protection is released and the valve can be opened. The overpressure value can be adjusted by rotating the large nut 30.

[0074] Combined with Figure 5 As shown, when an underpressure emergency occurs, the underpressure spring 31 pushes the piston 24 in the cylinder 23 to move quickly to the right. The piston 24 drives the pull ring 25, and the pull ring 25 forces the rotating plate 26 to rotate rightward around the fixed shaft 27. The seesaw 28 loses support and cannot provide enough locking force to press the lock block 18. The lock block 18 disengages from the annular groove of the pull rod 15, and the self-locking mechanism is unlocked. Under the action of the return spring 17, the pull rod 15 moves downward, driving the ball to rotate 90° through the transmission assembly. The main valve body 3 closes, completely isolating the wellhead from the export pipeline, and the sub-valve body also closes accordingly.

[0075] After an underpressure emergency cut-off occurs, the valve is in a fully closed state. The valve cylinder 23 is always connected to the production pipeline. In the case of continuous abnormal pipeline pressure, the valve implements in-situ protection. When the pipeline pressure returns to the normal production pressure, the protection is released and the valve can be opened. The overpressure value can be adjusted by rotating the small nut 32.

[0076] Components such as an overpressure spring 29 and an underpressure spring 31 are provided in the cylinder 23. When the pressure in the downstream pipeline is abnormal, the main valve body 3 can be driven to move by this component to urgently cut off the passage 2.

[0077] Furthermore, it also includes a main valve handwheel 33, and the main valve handwheel 33 is in transmission cooperation with the fifth gear 19 through a plurality of gears.

[0078] When the main valve motor 20 is abnormal, the main valve body 3 can be controlled through the main valve handwheel 33.

[0079] In a preferred embodiment, a part of the passage 2 upstream of the main valve body 3 is arranged as a Venturi tube 34, and a part of the passage downstream of the main valve body 3 is arranged as a Venturi tube 34. The Venturi tube 34 includes an inlet cylinder section, a conical contraction section, a cylindrical throat section, and a conical diffusion section connected in sequence.

[0080] The partial passage 2 is arranged as a Venturi tube 34, which can achieve throttling and pressure reduction.

[0081] The present invention also provides an intelligent control system for an intermittent well, which includes any one of the control valves 38 described above, and further includes a first pressure sensor 36 placed in the downstream pipeline of the control valve 38 for monitoring the pressure in the downstream pipeline and a second pressure sensor 37 placed in the upstream pipeline of the control valve 38 for monitoring the pressure in the upstream pipeline. The intelligent control system further includes a controller 35. The controller 35 is connected to the first pressure sensor 36, the second pressure sensor 37, and the control valve 38. The controller 35 can control the auxiliary valve body according to the first pressure sensor 36, and the controller 35 can control the main valve body 3 according to the second pressure sensor 37.

[0082] This intelligent control system for an intermittent well includes the control valve 38 described above, so it has the same technical effects. At the same time, it can realize on-site and remote intermittent functions, which are more reliable and economical for increasing production and efficiency and ensuring safe production in low-yield gas fields. It has certain theoretical and application values for further increasing gas production, enriching the technical theory of valves, and broadening the market of R & D technologies. At the same time, it reduces the travel rate of personnel, saves costs, improves the utilization rate of natural gas wells, reduces the risks of on-site safety production, saves labor costs, significantly improves economic benefits, and has long-term benefits with one-time investment. It greatly reduces the safety risks of wellhead workers and also achieves good results in optimizing labor organization and production management organization.

[0083] Furthermore, it further includes a pressure module 40. The controller 35 is connected to the pressure module 40. The pressure module 40 is provided with a preset opening pressure and closing pressure. The controller 35 can control the opening or closing of the control valve 38 according to the pressure values monitored by the pressure module 40 and the received first pressure sensor 36 and / or the second pressure sensor 37.

[0084] For example, set intermittent opening and closing pressures (adjustable according to site conditions). The intelligent control system automatically detects the upstream and downstream pressures. After the upstream pressure rises to the set value, the main valve body 3 executes the valve opening program, the main valve body 3 opens, and the auxiliary valve body is used for pressure reduction. After the pipeline pressure is stable and the upstream and downstream pressures are balanced, the auxiliary valve is in a fully open state. When the pipeline pressure reaches the set closing pressure, the main valve body 3 and the auxiliary valve body execute the closing command.

[0085] Further, it further includes a timing module 39 which is provided with the opening and closing times of the control valve, the timing module 39 is connected to the controller 35, and the controller 35 can control the opening or closing of the control valve 38 according to the timing module 39.

[0086] For example, set the intermittent opening and closing time range (open for 2 hours, with an opening time interval of 1 hour). The intelligent control system automatically detects. After reaching the set time value, the valve executes the valve opening program and the valve opens. After the intelligent control system detects that the opening reaches 2 hours, the valve automatically closes.

[0087] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control valve, characterized in that, It includes a valve seat, within which there is a channel allowing the medium to flow. Along the medium flow direction, a main valve body and a sub-valve body are successively arranged within the valve seat. The main valve body is used to fully open or fully close the channel, and the sub-valve body is used to adjust the opening degree of the channel. The sub-valve body is a slide plate capable of reciprocatingly moving in the radial direction of the channel. The surface of the slide plate is divided into an opening area and a non-opening area. By the change of the positional relationship between the reciprocating slide plate's opening area and non-opening area and the channel, the opening degree of the channel can be adjusted; It further includes a sub-valve motor, a first gear, a second gear, a third gear, and a lead screw. The lead screw is arranged within the valve seat, and the lead screw is connected to the slide plate. The inner circumferential surface of the first gear is provided with a threaded portion. The threaded portion is sleeved on the lead screw and is in cooperation with the lead screw. The rotating first gear can drive the lead screw to reciprocatingly move in the radial direction of the channel. The first gear meshes with the second gear, and the second gear meshes with the third gear. The output shaft of the sub-valve motor can drive the third gear to rotate. A friction disc is installed on the output shaft of the sub-valve motor. The friction disc rotates synchronously with the output shaft and the friction disc can move along the axis direction of the output shaft. On the opposite sides of the friction disc and the third gear, there are protrusions capable of cooperating with each other. A spring is fixedly connected between the output shaft and the friction disc. When the spring is in its natural state, the friction disc can drive the third gear to rotate through the mutually cooperating protrusions. It also includes a sub-valve handwheel. The sub-valve handwheel includes a handwheel shaft and a handwheel installed at the first end of the handwheel shaft. A fixed plate is fixedly arranged on the inner circumferential surface of the third gear. A non-circular hole is opened on the fixed plate. The handwheel shaft includes a non-circular shaft section that cooperates with the non-circular hole. The circular shaft section in contact with the non-circular shaft end and close to the friction disc can pass through the non-circular hole. When the handwheel is not pressed, the circular shaft section of the handwheel shaft is located within the non-circular hole and the friction disc cooperates with the third gear. When the handwheel is pressed, the second end of the handwheel shaft can push the friction disc to disengage it from the third gear and the spring is compressed. At the same time, the non-circular shaft section of the handwheel shaft cooperates with the non-circular hole. The opening area of the slide plate includes a number of through holes penetrating the upper and lower surfaces of the slide plate in the direction perpendicular to the surface of the slide plate.

2. The control valve according to claim 1, wherein It further includes an encoder. A fourth gear is installed at the output end of the encoder, and the fourth gear meshes with the third gear.

3. The control valve according to claim 1, characterized in that, The threaded portion is a nut, and the nut is fixedly installed on the inner circumferential surface of the first gear.

4. The control valve according to claim 1, characterized in that, It further includes a pull rod, a reset rod, a reset spring, a lock block and Gear Five. The pull rod is arranged parallel to the reset rod and both are slidably connected to the valve seat. Gear Five is provided between the pull rod and the reset rod. Corresponding to Gear Five, racks are provided at one ends of the pull rod and the reset rod. The rack of the pull rod meshes with Gear Five, and the rack of the reset rod meshes with Gear Five. A groove is formed in the pull rod, and the lock block can enter or slide out of the groove. The reset spring is sleeved on the reset rod, and a pressing member for pressing the reset spring is provided at the other end of the reset rod. One end of the reset spring contacts the pressing member and the other end of the reset spring is fixed on the valve seat. The gear shaft fixing Gear Five is connected to the main valve body. The upwardly moving pull rod drives Gear Five to rotate to fully open the main valve body and the lock block enters the groove. At the same time, the rotating Gear Five drives the reset rod to move downward to compress the reset spring. When the lock block slides out of the groove, the reset spring resets and drives the reset rod to move upward to enable Gear Five to rotate to fully close the main valve body.

5. The control valve according to claim 4, characterized in that, It further includes a main valve motor, a cam and a lifting block. The cam is installed on the output shaft of the main valve motor. The lifting block is connected to the pull rod. The cam cooperates with the lifting block and the rotating cam can drive the lifting block to move upward and thus drive the pull rod to move upward.

6. The control valve according to claim 4, characterized in that, It further includes a cylinder, a piston, a pull ring, a rotating plate, a fixed shaft, a rocker and an electromagnetic assembly. The cylinder communicates with the downstream pipeline of the control valve. The piston is slidably connected in the cylinder. The piston is connected to the pull ring. The rotating plate is rotatably connected through the fixed shaft. The fixed shaft is installed on the valve seat. The rotating plate presses one end of the rocker. The other end of the rocker presses the lock block. The medium entering the cylinder can pass through the piston, the pull ring, the rotating plate and the rocker to make the lock block enter the groove. The electromagnetic assembly cooperates with the rotating plate and the energized electromagnetic assembly can pull the rotating plate to make the lock block slide out of the groove.

7. The control valve according to claim 6, characterized in that, It further includes two overpressure springs. The first ends of the two overpressure springs are respectively connected to the side of the piston facing away from the pull ring. The two overpressure springs are located in a large housing. The first end of the large housing is hermetically connected to the valve seat. The inner peripheral surface of the second end of the large housing is provided with threads, and a large nut matching the threads is arranged inside the inner peripheral surface of the second end of the large housing. The second ends of the two overpressure springs respectively abut against the large nut. A small housing is arranged inside the large housing. It further includes an underpressure spring. The underpressure spring is located inside the small housing. The first end of the underpressure spring is connected to the side of the piston facing away from the pull ring. A hole is formed in the large nut, and the first end of the small housing is embedded in the hole. The inner peripheral surface of the first end of the small housing is provided with internal threads, and it further includes a small nut matching the internal threads. The second end of the underpressure spring abuts against the small nut. The two overpressure springs are symmetrically arranged in the annular space between the large housing and the small housing. The compression amount of the two overpressure springs can be adjusted through the large nut, and the compression amount of the underpressure spring can be adjusted through the small nut.

8. The control valve according to claim 4, characterized in that, It further includes a main valve handwheel, and the main valve handwheel is in transmission cooperation with the fifth gear through a plurality of gears.

9. The control valve according to claim 1, characterized in that, Part of the channel located upstream of the main valve body is arranged as a Venturi tube, and part of the channel located downstream of the main valve body is arranged as a Venturi tube. The Venturi tube includes an inlet cylindrical section, a conical contraction section, a cylindrical throat section, and a conical diffusion section connected in sequence.

10. An intelligent control system for an intermittent well, characterized in that, It includes the control valve according to any one of the above claims. It further includes a first pressure sensor placed in the downstream pipeline of the control valve for monitoring the pressure in the downstream pipeline and a second pressure sensor placed in the upstream pipeline of the control valve for monitoring the pressure in the upstream pipeline. It further includes a controller. The controller is connected to the first pressure sensor, the second pressure sensor, and the control valve. The controller can control the sub-valve body according to the first pressure sensor, and the controller can control the main valve body according to the second pressure sensor.

11. The system according to claim 10, characterized in that, It further includes a pressure module. The controller is connected to the pressure module. The pressure module is provided with a preset opening pressure and closing pressure. The controller can control the opening or closing of the control valve according to the pressure module and the pressure values monitored by the received first pressure sensor and / or the second pressure sensor.

12. The system according to claim 10, wherein It further includes a timing module. The timing module is set with the opening and closing times of the control valve. The timing module is connected to the controller. The controller can control the opening or closing of the control valve according to the timing module.

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