阅读说明：本技术 一种控制阀及采用该控制阀的间歇井智能控制系统 (Control valve and intermittent well intelligent control system adopting same ) 是由 顾岱鸿 刘广峰 乔义明 王力 吕占芯 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种控制阀,包括阀座,阀座内设有允许介质流动的通道,沿介质流动方向阀座内依次设有主阀阀体和副阀阀体,主阀阀体用于完全开启或完全关闭通道,副阀阀体用于调节通道的开度,副阀阀体为能够沿通道径向方向往复移动的滑板,滑板表面分为开孔区和非开孔区,往复移动的滑板通过其开孔区和非开孔区与通道的位置关系的变化能够调整通道的开度。该控制阀能够较大限度的保证管线压力稳定以实现正常生产。(The invention discloses a control valve, which comprises a valve seat, wherein a channel allowing a medium to flow is arranged in the valve seat, a main valve body and an auxiliary valve body are sequentially arranged in the valve seat along the medium flow direction, the main valve body is used for completely opening or completely closing the channel, the auxiliary valve body is used for adjusting the opening degree of the channel, the auxiliary valve body is a sliding plate capable of reciprocating along the radial direction of the channel, the surface of the sliding plate is divided into an opening area and a non-opening area, and the reciprocating sliding plate can adjust the opening degree of the channel through the change of the position relation between the opening area and the non-opening area of the sliding plate and the channel. The control valve can ensure the pressure stability of the pipeline to a large extent so as to realize normal production.)

1. A control valve is characterized by comprising a valve seat, wherein a channel allowing a medium to flow is arranged in the valve seat, a main valve body and an auxiliary valve body are sequentially arranged in the valve seat along the medium flow direction, the main valve body is used for completely opening or completely closing the channel, the auxiliary valve body is used for adjusting the opening degree of the channel, the auxiliary valve body is a sliding plate capable of reciprocating along the radial direction of the channel, the surface of the sliding plate is divided into an opening area and a non-opening area, and the reciprocating sliding plate can adjust the opening degree of the channel through the change of the position relation between the opening area and the non-opening area and the channel.

2. The control valve according to claim 1, further comprising a secondary valve motor, a first gear, a second gear, a third gear and a lead screw, wherein the lead screw is disposed in the valve seat, the lead screw is connected to the sliding plate, an inner peripheral surface of the first gear is provided with a threaded portion, the threaded portion is sleeved on the lead screw, the first gear which is matched with the lead screw and rotates can drive the lead screw to reciprocate along a radial direction of the passage, the first gear is meshed with the second gear, the second gear is meshed with the third gear, and an output shaft of the secondary valve motor can drive the third gear to rotate.

3. The control valve according to claim 2, wherein a friction disc is mounted on the output shaft of the sub-valve motor, the friction disc rotates synchronously with the output shaft and can move along the axial direction of the output shaft, the friction disc and the three opposite surfaces of the gear are provided with mutually matched protrusions, a spring is fixedly connected between the output shaft and the friction disc, the friction disc can drive the gear to rotate three times through the mutually matched protrusions when the spring is in a natural state, the sub-valve hand wheel further comprises a sub-valve hand wheel, the sub-valve hand wheel comprises a hand wheel shaft and a hand wheel mounted at a first end of the hand wheel shaft, a fixing plate is fixedly arranged on the inner circumferential surface of the gear, a non-circular hole is formed in the fixing plate, the hand wheel shaft comprises a non-circular shaft section mutually matched with the non-circular hole, and a circular shaft section which is in contact with the non-circular shaft end and is close to the friction disc can pass, when the hand wheel is not pressed, the circular shaft section of the hand wheel shaft is located in the non-circular hole, the friction wheel is matched with the third gear, when the hand wheel is pressed, the second end of the hand wheel shaft can push the friction disc to be separated from the third gear, the spring is compressed, and meanwhile, the non-circular shaft section of the hand wheel shaft is matched with the non-circular hole.

4. The control valve of claim 2, further comprising an encoder having an output end fitted with a gear four, said gear four meshing with said gear three.

5. The control valve of claim 2, wherein the threaded portion is a nut fixedly mounted to an inner circumferential surface of the first gear.

6. The control valve of claim 1, wherein the opening area of the slide plate includes a plurality of through holes extending through the upper and lower surfaces of the slide plate in a direction perpendicular to the surface of the slide plate.

7. The control valve according to claim 1, further comprising a pull rod, a reset spring, a lock block and a fifth gear, wherein the pull rod and the reset rod are arranged in parallel and are slidably connected to the valve seat, the fifth gear is arranged between the pull rod and the reset rod, a rack is arranged at one end of the pull rod and one end of the reset rod corresponding to the fifth gear, the rack of the pull rod is meshed with the fifth gear, the rack of the reset rod is meshed with the fifth gear, a groove is formed in the pull rod, the lock block can enter or slide out of the groove, the reset spring is sleeved on the reset rod, a pressing member for pressing the reset spring is arranged at the other end of the reset rod, one end of the reset spring contacts the pressing member, the other end of the reset spring is fixed on the valve seat, and a gear shaft for fixing the fifth gear is connected with the main valve body, the upward movement pull rod drives the five gears to rotate so as to be capable of completely opening the main valve body, the locking block enters the groove, meanwhile, the five gears rotate to drive the reset rod to move downwards so as to enable the reset spring to be compressed, the locking block slides out of the groove, the reset spring resets and drives the reset rod to move upwards so as to enable the five gears to rotate so as to completely close the main valve body.

8. The control valve of claim 7, further comprising a main valve motor, a cam and a lifting block, wherein the cam is mounted on an output shaft of the main valve motor, the lifting block is connected to the pull rod, the cam is engaged 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.

9. The control valve according to claim 7, further comprising a cylinder, a piston, a pull ring, a rotating plate, a fixed shaft, a rocker, and an electromagnetic assembly, wherein the cylinder is communicated with a 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 to the fixed shaft, the fixed shaft is mounted on the valve seat, the rotating plate presses against one end of the rocker, the other end of the rocker presses against the locking block, a medium entering the cylinder can pass through the piston, the pull ring, the rotating plate, and the rocker to enter the locking block into the groove, and the electromagnetic assembly is matched with the rotating plate and is powered on and can pull the rotating plate to enable the locking block to slide out of the groove.

10. The control valve of claim 9, further comprising two overpressure springs, wherein first ends of the two overpressure springs are respectively connected to a surface of the piston facing away from the pull ring, the two overpressure springs are located in a large shell, the first end of the large shell is hermetically connected to the valve seat, an inner circumferential surface of the second end of the large shell is threaded, a large nut matched with the threads is arranged in an inner circumferential surface of the second end of the large shell, second ends of the two overpressure springs respectively abut against the large nut, a small shell is arranged in the large shell, the control valve further comprises an underpressure spring, the underpressure spring is located in the small shell, a first end of the underpressure spring is connected to a surface of the underpressure piston facing away from the pull ring, a hole is formed in the large nut, and a first end of the small shell is embedded in the hole, the inner peripheral surface of the first end of the small shell is provided with an internal thread, the small shell further comprises a small nut matched with the internal thread, the second end of the under-pressure spring abuts against the small nut, the two overpressure springs are symmetrically arranged in an annular space between the large shell and the small shell, the compression amount of the two overpressure springs can be adjusted through the large nut, and the compression amount of the under-pressure spring can be adjusted through the small nut.

11. The control valve of claim 7, further comprising a main valve hand wheel in driving engagement with the gear five via a plurality of gears.

12. The control valve of claim 1, wherein the portion of the passageway located upstream of the main valve body is a venturi tube, the portion of the passageway located downstream of the main valve body is a venturi tube, and the venturi tube comprises an inlet cylinder section, a conical contraction section, a cylindrical throat section, and a conical diffusion section, which are connected in sequence.

13. An intelligent control system for an intermittent well, comprising a control valve according to any one of the preceding claims, further comprising a first pressure sensor disposed in a line downstream of the control valve for monitoring pressure in the downstream line and a second pressure sensor disposed in a line upstream of the control valve for monitoring pressure in the upstream line, and a controller connected to the first pressure sensor, the second pressure sensor and the control valve, the controller being capable of controlling the secondary valve body according to the first pressure sensor and the controller being capable of controlling the primary valve body according to the second pressure sensor.

14. The system of claim 13, further comprising a pressure module, wherein the controller is connected to the pressure module, a preset opening pressure and a preset closing pressure are provided in the pressure module, and the controller is capable of controlling the opening or closing of the control valve according to the pressure module and the received pressure value monitored by the first pressure sensor and/or the second pressure sensor.

15. The system of claim 13, further comprising a timing module configured to set the opening and closing times of the control valve, the timing module coupled to the controller, the controller configured to control the opening or closing of the control valve based on the timing module.

Technical Field

The invention relates to the technical field of gas field development, in particular to a control valve and an intermittent well intelligent control system adopting the control valve.

Background

With the large-scale development of gas fields, the productivity of gas wells gradually decreases, and low-yield gas wells cannot completely meet the production requirements due to low yield. Aiming at the current situation, on the basis of analyzing the production process and technology of the existing low-yield gas well at home and abroad, the production requirement of the low-yield gas well is met by adopting intermittent well opening and closing. The intermittent well switching is a method for achieving the purposes of carrying liquid and recovering production by relying on the self energy recovery of the gas well, and becomes an essential measure for stabilizing and increasing the production in the later production stage of the gas well. In this measure, a valve is required to connect or block the pipeline, and the pressure in the pipeline is also required to be adjusted by the valve to ensure the normal use of the pipeline.

At present, an electric intelligent throttle valve (needle valve) is mostly adopted in the valve, and the valve is opened and closed and the opening of the valve is adjusted by driving a valve rod through an electric actuator to act on a valve core; however, the valve utilizes a direct-acting opening mode, so that the opening torque is larger, the valve can be opened only by adopting higher-power, the requirement on the power is higher, meanwhile, the valve core of the valve is in a needle shape, the adjustability is smaller, the pressure adjusting precision is smaller, the valve is in an angle type, the valve core is seriously eroded, and the sealing is greatly influenced if the valve is used for a long time. In practical operation, the more commonly used valve also comprises a pneumatic membrane valve which consists of a spring and a driving cylinder and pushes the cylinder to reciprocate by controlling a driving air source (pipeline medium), so that a main spring is controlled to act on a valve core to open and close the valve and adjust the opening of the valve; because of pneumatic diaphragm valve relies on the pipeline medium, the condition of pipeline liquid passing and pressure fluctuation can appear sometimes, will cause the unstability of downstream pressure this moment, can not effectively protect the normal production of pipeline, and its case receives the erosion seriously simultaneously, and long-time use also can have great influence to sealed. In addition, among the prior art, also having the right angle formula stop valve, high-pressure gas is when passing through this valve, and energy loss is great, can make gas temperature drop suddenly, probably has the phenomenon of icing, and then can influence the normal use of valve.

In addition, the above-mentioned type of valve applied to field operation cannot be timely handled for an emergency situation, such as an abnormal pressure of a pipeline, and thus some loss may be caused, which may affect normal production.

Therefore, how to provide a control valve which can avoid the above technical problems and ensure the pipeline pressure to be stable to achieve normal production becomes a technical problem which needs to be solved urgently by those skilled in the art.

Disclosure of Invention

The invention aims to provide a control valve and an intermittent well intelligent control system adopting the control valve.

The invention provides a control valve, which comprises a valve seat, wherein a channel allowing a medium to flow is arranged in the valve seat, a main valve body and an auxiliary valve body are sequentially arranged in the valve seat along the medium flow direction, the main valve body is used for completely opening or completely closing the channel, the auxiliary valve body is used for adjusting the opening of the channel, the auxiliary valve body is a sliding plate capable of reciprocating along the radial direction of the channel, the surface of the sliding plate is divided into an opening area and a non-opening area, and the reciprocating sliding plate can adjust the opening of the channel through the change of the position relationship between the opening area and the non-opening area of the sliding plate and the channel.

Preferably, the valve further comprises an auxiliary valve motor, a first gear, a second gear, a third gear and a lead screw, wherein the lead screw is arranged in the valve seat and connected with the sliding plate, a threaded portion is arranged on the inner peripheral surface of the first gear, the threaded portion is sleeved on the lead screw and matched with the lead screw, the first gear which rotates can drive the lead screw to reciprocate along the radial direction of the channel, the first gear is meshed with the second gear, the second gear is meshed with the third gear, and an output shaft of the auxiliary valve motor can drive the third gear to rotate.

Preferably, an output shaft of the auxiliary valve motor is provided with a friction disc, the friction disc rotates synchronously with the output shaft and can move along the axial direction of the output shaft, opposite surfaces of the friction disc and the gear are provided with protrusions capable of being matched with each other, a spring is fixedly connected between the output shaft and the friction disc, the friction disc can drive the gear to rotate through the protrusions matched with each other when the spring is in a natural state, the auxiliary valve hand wheel further comprises an auxiliary valve hand wheel, the auxiliary valve hand wheel comprises a hand wheel shaft and a hand wheel arranged at the first end of the hand wheel shaft, a fixing plate is fixedly arranged on the inner circumferential surface of the gear, a non-circular hole is formed in the fixing plate, the hand wheel shaft comprises a non-circular shaft section matched with the non-circular hole, and a circular shaft section which is in contact with the non-circular shaft end and is close to the friction disc can, when the hand wheel is not pressed, the circular shaft section of the hand wheel shaft is located in the non-circular hole, the friction wheel is matched with the third gear, when the hand wheel is pressed, the second end of the hand wheel shaft can push the friction disc to be separated from the third gear, the spring is compressed, and meanwhile, the non-circular shaft section of the hand wheel shaft is matched with the non-circular hole.

Preferably, the device further comprises an encoder, wherein a gear four is mounted at the output end of the encoder, and the gear four is meshed with the gear three.

Preferably, the threaded portion is a nut, and the nut is fixedly mounted on the inner circumferential surface of the first gear.

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

Preferably, still include pull rod, release link, reset spring, locking piece and five gears, the pull rod with release link parallel arrangement and all sliding connection in the disk seat, the pull rod with be equipped with between the release link five gears, corresponding to five gears the pull rod with the one end of release link all is equipped with the rack, the rack of pull rod with five meshing of gear, the rack of release link with five meshing of gear, set up the recess on the pull rod, the locking piece can get into or the roll-off the recess, reset spring cover is located on the release link, the release link other end is equipped with to press reset spring's the piece that supports, reset spring's one end contact support the piece just reset spring's the other end is fixed in on the disk seat, and fixed five gear shafts of gear are connected the main valve body, upward movement the pull rod drives five gears rotate and can open completely the main valve body just the locking piece And when the locking block slides out of the groove, the reset spring resets to drive the reset rod to move upwards so that the five gears rotate to completely close the main valve body.

Preferably, the lifting device further comprises a main valve motor, a cam and a lifting block, wherein the cam is mounted on an output shaft of the main valve motor, the lifting block is connected with the pull rod, the cam is matched with the lifting block, and the rotating cam can drive the lifting block to move upwards so as to drive the pull rod to move upwards.

Preferably, still include cylinder, piston, pull ring, commentaries on classics board, fixed axle, wane and electromagnetic component, the cylinder intercommunication the downstream pipeline of control valve, piston sliding connection in the cylinder, the piston is connected the pull ring, change the board rotate connect in through on the fixed axle, the fixed axle install in on the disk seat, change the board and support and press the one end of wane, the other end of wane supports and presses the locking piece, the medium that gets into the cylinder can pass through the piston, the pull ring change the board with the wane will the locking piece gets into the recess, electromagnetic component cooperates in commentaries on classics board and circular telegram the electromagnetic component can stimulate the commentaries on classics board makes the locking piece roll-off the recess.

Preferably, the pressure-reducing valve further comprises two overpressure springs, first ends of the two overpressure springs are respectively connected to one surface, away from the pull ring, of the piston, the two overpressure springs are located in a large shell, the first end of the large shell is connected to the valve seat in a sealing mode, threads are formed in the inner circumferential surface of the second end of the large shell, a large nut matched with the threads is arranged in the inner circumferential surface of the second end of the large shell, the second ends of the two overpressure springs respectively abut against the large nut, a small shell is arranged in the large shell, the pressure-reducing valve further comprises an underpressure spring, the underpressure spring is located in the small shell, the first end of the underpressure spring is connected to one surface, away from the pull ring, of the piston, a hole is formed in the large nut, the first end of the small shell is embedded in the hole, and internal threads are formed in the, the pressure-reducing spring is characterized by further comprising a small nut matched with the internal thread, the second end of the pressure-reducing spring abuts against the small nut, the two pressure-reducing springs are symmetrically arranged in an annular space between the large shell and the small shell, the compression amount of the two pressure-reducing springs can be adjusted through the large nut, and the compression amount of the pressure-reducing spring can be adjusted through the small nut.

Preferably, the device further comprises a main valve hand wheel, and the main valve hand wheel is in transmission fit with the five gears through a plurality of gears.

Preferably, be located the part of main valve body upper reaches the passageway is the venturi setting, is located main valve body low reaches part the passageway is the venturi setting, venturi is including the entry cylinder section, the circular cone shrinkage section, cylinder throat and the circular cone divergent section that connect gradually.

The control valve provided by the invention has the following technical effects:

the control valve comprises a main valve body which can be used for completely opening or completely closing a channel of the control valve, and also comprises an auxiliary valve body in a sliding plate structure, wherein the main valve body and the auxiliary valve body are matched for use; specifically, when the pressure in the upstream pipeline reaches a certain value, the main valve body can be completely opened, meanwhile, the opening degree of the channel is adjusted through the auxiliary valve body, namely the movement of the sliding plate, and the auxiliary valve body is used as a pressure reducing valve, so that the pressure reducing effect is good, the adjusting precision is accurate, the pressure behind the valve is always kept in the working pressure range of the pipeline, and the pressure stability of the downstream pipeline can be ensured. The auxiliary valve body adopts a sliding plate structure, combines the advantages of a traditional straight-through single-seat valve and a butterfly valve, is stable in control, large in regulating pressure difference, sensitive in action, small in size, convenient to maintain and superior in sliding plate closing performance, overcomes the defects that a traditional regulating valve is small in differential pressure, difficult in valve internal part replacement, easy to block and the like, can accurately and quickly control the flow of a 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 passage can be closed completely and quickly through the main valve body, further loss is avoided, and then the auxiliary valve body is also closed, so that double protection is realized.

Preferably, the sliding plate is driven by a common mechanical transmission part, so that the structure is simple and easy to realize, and the maintenance is convenient.

Preferably, the auxiliary valve comprises an auxiliary valve hand wheel, and the auxiliary valve body can be controlled by the auxiliary valve hand wheel when the auxiliary valve motor is abnormal due to the arrangement of a friction disc, a spring and the like.

Preferably, the control device further comprises an encoder for controlling the opening degree of the sub-valve body with higher precision.

Preferably, the opening or closing of the main valve body is realized through the cooperation of a pull rod, a reset rod, a gear and a reset spring, and all the components are common mechanical components, so that the main valve body is convenient to manufacture and easy to maintain.

Preferably, the lifting block is driven by the cam, and after the handle block is lifted to a certain height by the cam, the cam can provide a space for the lifting block to move downwards, and the cam provides power for the lifting block to move upwards and cannot influence downward movement of the lifting block.

Preferably, the cylinder is internally provided with components such as an overpressure spring, an underpressure spring and the like, and when the pressure in the downstream pipeline is abnormal, the components can drive the main valve body to move so as to cut off the passage emergently.

Preferably, the control device further comprises a main valve hand wheel, and the main valve body can be controlled by the main valve hand wheel when the main valve motor is abnormal.

Preferably, part of the channels are provided with Venturi pipes, and throttling decompression can be realized.

The invention also provides an intelligent control system for the intermittent well, which comprises the control valve, a first pressure sensor arranged in a pipeline downstream of the control valve and used for monitoring the pressure in the downstream pipeline, a second pressure sensor arranged in a pipeline upstream of the control valve and used for monitoring the pressure in the upstream pipeline, and a controller, wherein the controller is connected with the first pressure sensor, the second pressure sensor and the control valve, the controller can control the auxiliary valve body according to the first pressure sensor, and the controller can control the main valve body according to the second pressure sensor.

Preferably, the pressure control device further comprises a pressure module, the controller is connected with the pressure module, preset opening pressure and preset closing pressure are arranged in the pressure module, and the controller can control the opening or closing of the control valve according to the pressure module and the received pressure value monitored by the first pressure sensor and/or the second pressure sensor.

Preferably, the timing control device further comprises a timing module, the timing module is provided with opening and closing time of the control valve, the timing module is connected with the controller, and the controller can control the opening or closing of the control valve according to the timing module.

The intermittent well intelligent control system provided by the invention comprises the control valve, so that the intermittent well intelligent control system has the same technical effect, can realize the on-site and remote intermittent functions, and is more reliable and economical in production increase and efficiency increase of a low-gas-production field and safe production application. The method has certain theoretical and application values for further improving the gas production, enriching the technical theory of the valve, widening the market of research and development technology and the like. Meanwhile, the trip rate of personnel is reduced, and the cost is saved; the utilization rate of the natural gas well is improved, the risk of site safety production is reduced, the labor cost is saved, the economic benefit is obviously improved, and the natural gas well is beneficial for a long time after once investment. The safety risk of well head workers is greatly reduced, and meanwhile, better effects are achieved in the aspects of labor organization optimization and production management organization optimization.

Preferably, the system can implement a pressure batch mode or a time batch mode to produce.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a front cross-sectional view of one embodiment of a control valve provided by the present invention;

FIG. 2 is a side cross-sectional view of one embodiment of a control valve provided by the present invention;

FIG. 3 is a schematic structural view of the sub-valve body and associated components of FIG. 1;

FIG. 4 is a schematic view of the lock block sliding out of the groove under overpressure;

FIG. 5 is a schematic structural view of the lock block sliding out of the groove under-pressure condition;

FIG. 6 is a schematic structural view of a venturi;

fig. 7 is a schematic structural diagram of an embodiment of an intermittent well intelligent control system provided by the invention.

The reference numerals in fig. 1-7 are as follows:

1 valve seat, 2 passages, 3 main valve bodies, 4 sliding plates, 41 perforated areas, 411 through holes, 42 non-perforated areas, 5 auxiliary valve motors, 6 gear I, 7 gear II, 8 gear III, 9 lead screw, 10 nut, 11 friction disc, 12 auxiliary valve hand wheels, 121 hand wheel shaft, 122 hand wheel, 13 encoder, 14 gear IV, 15 pull rod, 151 groove, 16 reset rod, 17 reset spring, 18 locking block, 19 gear V, 20 main valve motor, 21 cam, 22 lifting block, 23 cylinder, 24 piston, 25 pull ring, 26 rotating plate, 27 fixing shaft, 28 rocker, 29 overpressure spring, 30 big nut, 31 underpressure spring, 32 small nut, 33 main valve hand wheel, 34, 35 controller, 36 first pressure sensor, 37 second pressure sensor, 38 control valve, 39 timing module, 40 pressure module.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

1-7, FIG. 1 is a front cross-sectional view of one embodiment of a control valve provided in accordance with the present invention;

FIG. 2 is a side cross-sectional view of one embodiment of a control valve provided by the present invention;

FIG. 3 is a schematic structural view of the sub-valve body and associated components of FIG. 1;

FIG. 4 is a schematic view of the lock block sliding out of the groove under overpressure;

FIG. 5 is a schematic structural view of the lock block sliding out of the groove under-pressure condition;

FIG. 6 is a schematic structural view of a venturi;

fig. 7 is a schematic structural diagram of an embodiment of an intermittent well intelligent control system provided by the invention.

As shown in fig. 1 to 3, the present invention provides a control valve, which comprises, in one embodiment, a valve seat 1, a passage 2 for allowing a medium to flow is provided in the valve seat 1, a main valve body 3 and an auxiliary valve body are provided in the valve seat 1 in sequence along a medium flow direction, the main valve body 3 is used for completely opening or completely closing the passage 2, the auxiliary valve body is used for adjusting an opening degree of the passage 2, the auxiliary valve body is a slide plate 4 capable of reciprocating along a radial direction of the passage 2, a surface of the slide plate 4 is divided into an open area 41 and a non-open area 42, and the reciprocating slide plate 4 can adjust the opening degree of the passage 2 by changing a positional relationship between the open area 41 and the non-open area 42 and the passage 2.

In this embodiment, the passage 2 is a straight passage, but the specific structure of the valve seat 1 is not limited.

The main valve body 3 is a ball valve, but the power components are not limited, for example, a motor can be used, and the belt or gear transmission can drive the main valve body 3 to move to completely open or completely close the passage 2, it can be understood that there are only two positions of the main valve body 3, one position can make the passage 2 completely open, and the other position can make the passage 2 completely closed.

The auxiliary valve body is provided with an open area 41 and a non-open area 42, and when the non-open area 42 is arranged in the channel 2, the auxiliary valve body completely closes the channel 2, and when the open area 41 is partially or completely arranged in the channel 2, the auxiliary valve body partially or completely opens the channel 2.

The provided control valve comprises a main valve body 3, wherein the main valve body 3 can be used for completely opening or completely closing a channel 2 of the control valve, and simultaneously, the control valve also comprises an auxiliary valve body in a sliding plate 4 structure, and the main valve body 3 and the auxiliary valve body are matched for use; specifically, when the pressure in the upstream pipeline reaches a certain value, the main valve body 3 can be completely opened, and meanwhile, the opening degree of the channel 2 is adjusted through the auxiliary valve body, namely the movement of the sliding plate 4, and the auxiliary valve body is used as an adjusting pressure reducing valve, so that the pressure reducing effect is good, the adjusting precision is accurate, the pressure behind the valve is always kept in the working pressure range of the pipeline, and the pressure stability of the downstream pipeline can be ensured. The auxiliary valve body adopts the structure of the sliding plate 4, the advantages of a traditional straight-through single-seat valve and a butterfly valve are combined, the control is stable, the regulation pressure difference is large, the action is sensitive, the size is small, the maintenance is convenient, the sliding plate closing performance is superior, the defects that the traditional regulating valve is small in differential pressure, difficult in valve internal part replacement, easy to block and the like are overcome, the flow of a medium can be accurately and quickly controlled, and the use is safer, more flexible and more reliable. In addition, if the pressure of the upstream pipeline and/or the downstream pipeline is abnormal, the channel 2 can be closed completely and quickly through the main valve body 3, further loss is avoided, and then the auxiliary valve body is also closed, so that double protection is realized.

In another embodiment, referring to fig. 1-3, the valve seat 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 disposed in the valve seat 1, the lead screw 9 is connected to the sliding plate 4, a threaded portion is disposed on an inner circumferential surface of the first gear 6, the threaded portion is sleeved on the lead screw 9, the first gear 6, which is matched with the lead screw 9 and rotates, can drive the lead screw 9 to reciprocate along a radial direction of the channel 2, the first gear 6 is engaged with the second gear 7, the second gear 7 is engaged with the third gear 8, and an output shaft of the sub-valve motor 5 can drive the.

In this embodiment, the movement of the sliding plate 4 is driven by a common mechanical transmission part, so that the structure is simple and easy to realize, and the maintenance is also convenient.

In this embodiment, the second gear 7 is provided as an intermediate transmission gear, so that the radius of the third gear 8 is smaller, and the above components can be smoothly covered by the valve cover, but in another embodiment, the second gear 7 may not be included, and for example, the third gear 8 may directly mesh with the first gear 6.

In a preferred embodiment, a friction disc 11 is mounted on an output shaft of the sub-valve motor 5, the friction disc 11 rotates synchronously with the output shaft, the friction disc 11 can move along an axial direction of the output shaft, protrusions capable of being matched with each other are arranged on opposite surfaces of the friction disc 11 and the gear wheel 8, a spring (not shown in the drawing) is fixedly connected between the output shaft and the friction disc 11, the friction disc 11 can drive the gear wheel 8 to rotate through the protrusions matched with each other when the spring is in a natural state, the sub-valve hand wheel 12 further comprises a hand wheel shaft 121 and a hand wheel 122 mounted at a first end of the hand wheel shaft 121, a fixing plate (not shown in the drawing) is fixedly arranged on an inner circumferential surface of the gear wheel 8, a non-circular hole is formed in the fixing plate, the hand wheel shaft 121 comprises a non-circular shaft section matched with the non-circular, the circular shaft section which is in contact with the non-circular shaft end and close to the friction disc 11 can pass through the non-circular hole, when the hand wheel 122 is not pressed, the circular shaft section of the hand wheel shaft 121 is located in the non-circular hole, the friction wheel 11 is matched with the gear wheel III 8, when the hand wheel 122 is pressed, the second end of the hand wheel shaft 121 can push the friction disc 11 to be separated from the gear wheel III 8, the spring is compressed, and meanwhile, the non-circular shaft section of the hand wheel shaft 121 is matched with the non-circular hole.

In this embodiment, when an abnormality occurs in the sub-valve motor 5, the sub-valve body can be controlled by the sub-valve hand wheel 12.

As shown in fig. 1-3, the device further comprises an encoder 13, wherein a gear four 14 is mounted at the output end of the encoder 13, and the gear four 14 is meshed with the gear three 8.

The encoder 13 controls the opening degree of the sub-valve body with higher accuracy.

In one embodiment, the threaded portion is a nut 10. Of course, not limited thereto.

In one embodiment, the opening area 41 of the sliding plate 4 comprises a plurality of through holes 411 penetrating through the upper and lower surfaces of the sliding plate 4 in a direction perpendicular to the surface of the sliding plate 4.

Further, as shown in fig. 1 to 7, the valve seat further includes a pull rod 15, a reset rod 16, a reset spring 17, a locking block 18 and a five gear 19, the pull rod 15 and the reset rod 16 are arranged in parallel and are all slidably connected to the valve seat 1, the five gear 19 is arranged between the pull rod 15 and the reset rod 16, a rack is arranged at one end of each of the pull rod 15 and the reset rod 16 corresponding to the five gear 19, the rack of the pull rod 15 is engaged with the five gear 19, the rack of the reset rod 16 is engaged with the five gear 19, a groove 151 is formed in the pull rod 15, the locking block 18 can enter or slide out of the groove 151, the reset spring 17 is sleeved on the reset rod 16, a pressing member for pressing the reset spring 17 is arranged at the other end of the reset rod 16, one end of the reset spring 17 contacts the pressing member and the other end of the reset spring 17 is fixed on the valve seat 1, it is fixed the gear shaft of five 19 gears is connected main valve body 3, the ball valve promptly, upward movement pull rod 15 drives five 19 gears rotate and can open completely main valve body 3 just locking piece 18 gets into recess 151, and pivoted simultaneously five 19 gears drive release link 16 downstream can make return spring 17 is compressed, locking piece 18 roll-off during recess 151, return spring 17 resets and drives release link 16 upward movement can make five 19 gears rotate in order to close completely main valve body 3.

The opening or closing of the main valve body 3 is realized through the matching of the pull rod 15, the reset rod 16, the five gear 19 and the reset spring 17, and all the components are common mechanical components, so that the manufacture is convenient, and the maintenance is easy.

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 mounted on an output shaft of the main valve motor 20, the lifting block 22 is connected to the pull rod 15, the cam 21 is fitted to 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.

The cam 21 drives the lifting block 22, when the cam 21 lifts the lifting block 22 to a certain height, the cam 21 can provide a space for the lifting block 22 to move downwards, and the cam 21 provides power for the lifting block 22 to move upwards and cannot influence downward movement of the lifting block 22. Of course, the power mechanism may also adopt gear transmission to drive the pull rod 15 to move, but at this time, a separate component needs to be equipped to enable the lifting block 22 to smoothly move downwards.

Further, the valve seat further comprises a cylinder 23, a piston 24, a pull ring 25, a rotating plate 26, a fixed shaft 27, a rocker 28 and an electromagnetic assembly, wherein the cylinder 23 is communicated with a downstream pipeline of the control valve, the piston 24 is slidably connected in the cylinder 23, the piston 24 is connected with the pull ring 25, the rotating plate 26 is rotatably connected to the fixed shaft 27, the fixed shaft 27 is mounted on the valve seat 1, the rotating plate 26 presses one end of the rocker 28, the other end of the rocker 28 presses the locking block 18, a medium entering the cylinder 23 can enter the locking block 18 into the groove 151 through the piston 24, the pull ring 25, the rotating plate 26 and the rocker 28, and the electromagnetic assembly is matched with the rotating plate 26 and electrified can pull the rotating plate 26 to enable the locking block 18 to slide out of the groove 151.

The valve seat further comprises two overpressure springs 29, first ends of the two overpressure springs 29 are respectively connected to one surface, away from the pull ring 25, of the piston 24, the two overpressure springs 29 are located in a large shell, the first end of the large shell is connected to the valve seat 1 in a sealing mode, the inner circumferential surface of the second end of the large shell is provided with threads, a large nut 30 matched with the threads is arranged in the inner circumferential surface of the second end of the large shell, the second ends of the two overpressure springs 29 respectively abut against the large nut 30, a small shell is arranged in the large shell, the valve seat further comprises an underpressure spring 31, the underpressure spring 31 is located in the small shell, the first end of the underpressure spring 31 is connected to one surface, away from the pull ring 25, of the piston 24, the large nut 30 is provided with a hole, the first end of the small shell is embedded in the hole, and inner circumferential surfaces of the first ends of the, the pressure reducing device is characterized by further comprising a small nut 32 matched with the internal thread, the second end of the pressure reducing spring 31 abuts against the small nut 32, the two overpressure springs 29 are symmetrically arranged in an annular space between the large shell and the small shell, the compression amount of the two overpressure springs 29 can be adjusted through the large nut 30, and the compression amount of the pressure reducing spring 31 can be adjusted through the small nut 32.

Referring to fig. 4, in case of an overpressure emergency, the medium pushes the piston 24 in the cylinder 23 to compress the overpressure spring 29 to move to the left, the piston 24 drives the pull ring 25, the pull ring 25 forces the rotating plate 26 to rotate to the left around the fixed shaft 27, the rocker 28 loses support and cannot provide enough locking force to press the locking block 18, the locking block 18 is disengaged from the annular groove of the pull rod 15, the self-locking mechanism is unlocked, the pull rod 15 moves downwards under the action of the return spring 17, the ball is driven to rotate 90 degrees by the transmission assembly, the main valve body 3 closes the channel 2, the wellhead is completely isolated from the external pipeline, and the auxiliary valve body is also closed accordingly.

When the over-compression and the sharp-cut occur, the valve is in a completely closed state. The valve cylinder 23 is always communicated with the production pipeline, the valve is protected in situ under the condition of abnormal continuous pipeline pressure, and when the pipeline pressure is recovered to normal production pressure, the protection is removed, and the valve can be opened. The overpressure value can be adjusted by rotation of the large nut 30.

Referring to fig. 5, when an under-pressure emergency occurs, the under-pressure spring 31 pushes the piston 24 in the cylinder 23 to move right rapidly, the piston 24 drives the pull ring 25, the pull ring 25 forces the rotating plate 26 to rotate right around the fixed shaft 27, the rocker 28 loses support and cannot provide enough locking force to press the locking block 18, the locking block 18 is disengaged from the annular groove of the pull rod 15, the self-locking mechanism unlocks, the pull rod 15 moves downward under the action of the return spring 17, the transmission assembly drives the ball to rotate 90 degrees, the main valve body 3 is closed, the wellhead is completely isolated from the external pipeline, and the auxiliary valve body is also closed accordingly.

When the under-compression and the sharp-cutting occur, the valve is in a completely closed state. The valve cylinder 23 is always communicated with the production pipeline, the valve is protected in situ under the condition of abnormal continuous pipeline pressure, and when the pipeline pressure is recovered to normal production pressure, the protection is removed, and the valve can be opened. The overpressure value can be adjusted by rotation of the small nut 32.

The cylinder 23 is provided with a overpressure spring 29 and an underpressure spring 31, which can drive the main valve body 3 to move to emergency shut off the passage 2 when the pressure in the downstream pipeline is abnormal.

Further, the device also comprises a main valve hand wheel 33, wherein the main valve hand wheel 33 is in transmission fit with the five gear 19 through a plurality of gears.

When the main valve motor 20 is abnormal, the main valve body 3 can be controlled by the main valve hand wheel 33.

In a preferred embodiment, the part of the channel 2 located at the upstream of the main valve body 3 is a venturi tube 34, the part located at the downstream of the main valve body 3 is a venturi tube 34, and the venturi tube 34 comprises an inlet cylindrical section, a conical contraction section, a cylindrical throat part and a conical diffusion section which are connected in sequence.

Part of the channels 2 are provided with Venturi pipes 34, and throttling decompression can be realized.

The invention also provides an intelligent control system for intermittent wells, which comprises any one of the control valves 38, a first pressure sensor 36 arranged in a pipeline downstream of the control valve 38 and used for monitoring the pressure in the downstream pipeline, a second pressure sensor 37 arranged in a pipeline upstream of the control valve 38 and used for monitoring the pressure in the upstream pipeline, and a controller 35, wherein the controller 35 is connected with 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.

The intermittent well intelligent control system comprises the control valve 38, so the intermittent well intelligent control system has the same technical effect, can realize the on-site and remote intermittent functions, and is more reliable and economical in production increase and efficiency increase of low-yield gas fields and safe production application. The method has certain theoretical and application values for further improving the gas production, enriching the technical theory of the valve, widening the market of research and development technology and the like. Meanwhile, the trip rate of personnel is reduced, and the cost is saved; the utilization rate of the natural gas well is improved, the risk of site safety production is reduced, the labor cost is saved, the economic benefit is obviously improved, and the natural gas well is beneficial for a long time after once investment. The safety risk of well head workers is greatly reduced, and meanwhile, better effects are achieved in the aspects of labor organization optimization and production management organization optimization.

Further, the pressure control device further comprises a pressure module 40, the controller 35 is connected with the pressure module 40, a preset opening pressure and a preset closing pressure are arranged in the pressure module 40, and the controller 35 can control the opening or closing of the control valve 38 according to the pressure module 40 and the pressure value monitored by the first pressure sensor 36 and/or the second pressure sensor 37.

For example, intermittent opening and closing pressures (adjustable according to field conditions) are set, the intelligent control system automatically detects upstream and downstream pressures, after the upstream pressure rises to a set value, the main valve body 3 executes a valve opening program, the main valve body 3 is opened and is decompressed through the opening of the auxiliary valve body, after the pipeline pressure is stable and the upstream and downstream pressures are balanced, the auxiliary valve is in a fully open state, and when the pipeline pressure reaches the set closing pressure, the main valve body 3 and the auxiliary valve body execute a closing command.

Further, the automatic control device further comprises a timing module 39, the timing module 39 is provided with the opening and closing time of the control valve, the timing module 39 is connected with the controller 35, and the controller 35 can control the opening or closing of the control valve 38 according to the timing module 39.

For example, setting an intermittent on-off time range (2 hours for opening, 1 hour for opening time interval), automatically detecting by the intelligent control system, executing a valve opening program by the valve after a time set value is reached, opening the valve, and automatically closing the valve after the time set value for opening is detected by the intelligent control system to reach 2 hours.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.