阅读说明：本技术 提升短接式自动连续正反循环阀及油井冲砂作业配套组件 (Lifting short-connection type automatic continuous positive and negative circulating valve and oil well sand washing operation matching assembly ) 是由 苏长明 唐丙杰 于 2021-09-30 设计创作，主要内容包括：本发明涉及阀门开关技术领域,公开了一种提升短接式自动连续正反循环阀及油井冲砂作业配套组件,包括有阀体及活动封堵阀芯,阀体上设置有阀腔通路,阀腔通路上分布有第一开口、第二开口及第三开口,活动封堵阀芯可活动的设置在阀腔通路内,当活动封堵阀芯处在第一位置,第一开口与第三开口相连通并形成一个流动通路,当活动封堵阀芯处在第二位置,第二开口与第三开口相连通并形成另一个流动通路。上述,一个阀门结构能实现两个流通通路的切换导通,便于进行切换操作,整体结构简洁紧凑,降低阀体长度,应用在冲砂作业中,具有实现连续冲砂、安全操控的效果,降低更换油管时,给施工带来的难度和繁琐度,提高作业效率。(The invention relates to the technical field of valve switches, and discloses a lifting short-circuit type automatic continuous positive and negative circulation valve and an oil well sand washing operation matched assembly. Above-mentioned, a valve structure can realize switching of two circulation passageways and switch on, is convenient for switch the operation, and overall structure is succinct compact, reduces valve body length, uses in the sand washing operation, has the effect of realizing continuous sand washing, safety control, when reducing the change oil pipe, the degree of difficulty and the loaded down with trivial details degree that bring for the construction improve the operating efficiency.)

1. The utility model provides a promote automatic continuous positive and negative circulation valve of short circuit formula, characterized in that, including valve body (1) and activity shutoff case (2), be provided with the valve pocket passageway on valve body (1), it has first opening, second opening (11) and third opening (7) to distribute on the valve pocket passageway, activity shutoff case (2) mobilizable setting is in the valve pocket passageway, works as activity shutoff case (2) are in the first position, first opening with third opening (7) are linked together and form a flow path, works as when activity shutoff case (2) are in the second position, second opening (11) with third opening (7) are linked together and form another flow path.

2. The poppet shorting-type automatic continuous forward/reverse circulation valve according to claim 1, further comprising an automatic reset component, wherein when the valve chamber passageway is filled with fluid through the first opening, the movable blocking valve element (2) is displaced to the first position, the automatic reset component generates an inductive change, and when the valve chamber passageway is filled with fluid from the first opening, the change of the automatic reset component is restored and drives the movable blocking valve element (2) to be displaced to the second position.

3. The lift short type automatic continuous positive and negative circulation valve according to claim 2, wherein the automatic return assembly comprises a return elastic member (8), when fluid flows into the valve chamber passage through the first opening, the movable shutoff valve core (2) is pushed by the fluid to displace to the first position and the return elastic member (8) is elastically deformed, and when the pushing force of the fluid flowing through the first opening is weakened or disappeared, the return elastic member (8) restores the elastic deformation and drives the movable shutoff valve core (2) to return to the second position.

4. The lift short circuit type automatic continuous positive and negative circulation valve according to claim 3, further comprising a fixed valve core (6) sealed in the valve cavity passage, wherein the fixed valve core (6) is provided with the first opening, and when the movable sealing valve core (2) is displaced to the second position, the movable sealing valve core seals the first opening and abuts against the fixed valve core (6) to form a first limit structure.

5. The poppet shorting-type automatic continuous forward/reverse circulation valve according to claim 4, wherein a second limit structure is further disposed on the valve chamber passage to enable the first position to form a displacement end point of the movable shutoff valve element (2).

6. The poppet-shorted automatic continuous positive-negative circulation valve according to claim 5, further comprising a reverse circulation acting member (9) for pressing the movable shutoff valve spool (2) against the first position, so that the movable shutoff valve spool (2) can be maintained in the first position when liquid flows from the third opening (7) toward the first opening.

7. The poppet shorting automatic continuous forward/reverse circulation valve according to claim 6, wherein the third opening (7) and the first opening are spaced apart and coaxially arranged along the extension direction of the valve chamber passage, the second opening (11) is located between the third opening (7) and the first opening and is opened on the side wall of the valve chamber passage, and the movable shutoff valve element (2) is reciprocally displaced along the direction from the first opening to the second opening (11).

8. The lifting short-circuit type automatic continuous positive and negative circulation valve according to claim 7, wherein the movable plugging valve element (2) comprises a shaft section for plugging the second opening (11) and a limit boss protruding from the shaft section in the radial direction, a limit step surface is arranged on the inner wall of the valve cavity passage on one side of the second opening (11) close to the first opening, the limit boss is used for abutting against the limit step surface and forming the second limit structure, and a communication passage which is through and communicated with the valve cavity passage is axially arranged on the movable plugging valve element (2).

9. The lift short type automatic continuous positive and negative circulation valve according to claim 8, wherein the automatic return assembly further comprises a connecting rod (3) having a first end fixedly disposed with the movable plugging valve element (2) and a second end slidably connected with the fixed valve element (6), one end of the return elastic member (8) is fixedly disposed with the second end of the connecting rod (3), and the other end abuts against the fixed valve element (6); the second end of the connecting rod (3) penetrates through the fixed valve core (6) and is positioned on one side, away from the movable plugging valve core (2), of the fixed valve core (6), the reverse circulation acting piece (9) is detachably connected to the second end of the connecting rod (3) and extends in the radial direction, a through passage for liquid to flow through is formed in the reverse circulation acting piece (9), and a connecting and fixing structure for connecting a pipeline is arranged on the inner wall of the valve cavity passage between the fixed valve core (6) and the reverse circulation acting piece (9).

10. A well sand washing operation kit, characterized in that it comprises a lift short type automatic continuous positive and negative circulation valve according to any one of claims 1 to 9, wherein the first opening and the third opening (7) are respectively arranged at two ends of the valve body (1) for connecting oil pipes.

Technical Field

The invention relates to the technical field of valve switches, in particular to a lifting short-circuit type automatic continuous positive and negative circulating valve and an oil well sand washing operation matched assembly.

Background

In oil field and well operation, one link is sand washing operation, which includes connecting pump and liquid pipeline (usually hose) to oil pipe, extending the oil pipe into well, pumping sand washing liquid to flow out from the end pipe orifice of oil pipe via hose and oil pipe to impact sand deposited in well bottom, mixing sand with sand washing liquid and returning to ground along the annular space between oil pipe and well wall. The sand at the bottom of the well is scattered, the oil pipe is pushed into the well, after one oil pipe is pushed, the connection between the water hose and the oil pipe needs to be disconnected, then one oil pipe is connected again, the water hose is connected with a new oil pipe again, the oil pipe is commonly called to be replaced, and then sand washing is continued and the oil pipe is pushed into the well. The operation is circulated until the sand setting in the well is flushed to the ground.

In the conventional sand washing operation mode, the sand washing operation is stopped every time the oil pipe is replaced. The pump is stopped and the oil pipe is single, so that the sand washing efficiency is influenced, the problems that suspended sand sinks and a pipe column is easy to clamp are caused, the conventional mode is not convenient for the development of the underground sand outlet position detection technology, and therefore the continuous sand washing technology without stopping the pump is urgently needed on site. However, the current continuous sand washing method has two forms: one method is to adopt a coiled tubing operation machine to wash sand, which needs professional equipment and operators and is inconvenient to popularize on site; the other is a continuous sand washing technology which utilizes a conventional oil pipe and reverses in a sleeve, in the mode, as the circulating valves applied to the oil pipe in the prior art have single functions and are all one-way valves, a reversing circulating valve consisting of two independent circulating valve structures is required to be installed on the oil pipe for flow direction switching. This switching-over circulating valve and valve annex structure of combination formula are complicated, including the disk seat, complicated component etc. in valve pipe and the valve, and the whole length of valve body is big, connect length and the weight that can increase the tubular column on oil pipe, when leading to changing oil pipe, the conventional hoisting ring load that matches with oil pipe is not enough, still need to change the bigger hoisting ring of load and just can construct, and install the switching-over valve of this combination formula and also need go into longer sealed section of thick bamboo under the well, all can increase the construction degree of difficulty, it is inconvenient to lead to the site operation, influence the operating efficiency.

In order to solve the above problems, a circulation valve with a simpler structure is needed to realize continuous sand washing and reduce the complexity or difficulty of operation.

Disclosure of Invention

The invention aims to provide a lifting short-circuit type automatic continuous positive and negative circulation valve, one valve structure can realize switching conduction of two circulation passages and is convenient for switching operation, compared with a reversing valve with two independent valve structures in the prior art, the whole structure is simple and compact, the length of a valve body can be reduced, and the lifting short-circuit type automatic continuous positive and negative circulation valve has the effects of realizing continuous sand washing and safe control when being applied to sand washing operation, reduces the difficulty and complexity brought to construction when an oil pipe is replaced, and improves the operation efficiency. The invention also aims to provide an oil well sand washing operation matching assembly comprising the lifting short-circuit type automatic continuous positive and negative circulating valve.

In order to achieve the above object, the present invention provides a short-circuit lifting type automatic continuous forward and reverse circulation valve, which comprises a valve body and a movable blocking valve element, wherein a valve chamber passage is arranged on the valve body, a first opening, a second opening and a third opening are distributed on the valve chamber passage, the movable blocking valve element is movably arranged in the valve chamber passage, when the movable blocking valve element is located at a first position, the first opening is communicated with the third opening to form a flow passage, and when the movable blocking valve element is located at a second position, the second opening is communicated with the third opening to form another flow passage.

Preferably, the valve further comprises an automatic resetting component, when liquid flows into the valve cavity passage through one side of the first opening, the movable plugging valve core is displaced to the first position, the automatic resetting component generates induction change, and when the liquid flow of the valve cavity passage from one side of the first opening is reduced or disappears, the change of the automatic resetting component is restored and drives the movable plugging valve core to be displaced to the second position.

Preferably, the automatic resetting assembly comprises a resetting elastic member, when liquid flows into the valve cavity passage through the first opening, the movable plugging valve core is pushed by the liquid to displace to the first position and the resetting elastic member generates elastic deformation, and when the pushing force of the liquid flowing into the valve cavity passage through the first opening is weakened or disappears, the resetting elastic member restores the elastic deformation and drives the movable plugging valve core to return to the second position.

Preferably, the valve further comprises a fixed valve core blocked in the valve cavity passage, the fixed valve core is provided with the first opening, and when the movable blocking valve core moves to the second position, the movable blocking valve core blocks the first opening and abuts against the fixed valve core to form a first limiting structure.

Preferably, the valve cavity passage is further provided with a second limiting structure which enables the first position to form a displacement end point of the movable plugging valve core.

Preferably, a reverse circulation acting member is included for pressing the movable shutoff valve element against the first position so that the movable shutoff valve element can be maintained in the first position when liquid flows from the third opening toward the first opening.

Preferably, the third opening and the first opening are spaced in the extending direction of the valve chamber passage and are arranged in the same axial direction, the second opening is located between the third opening and the first opening and is arranged on the side wall of the valve chamber passage, and the movable blocking valve core is displaced in a reciprocating manner in the direction from the first opening to the second opening.

Preferably, the movable plugging valve core comprises a cylindrical section for plugging the second opening and a limiting boss protruding from the cylindrical section along the radial direction, a limiting step surface is arranged on the inner wall of the valve cavity passage at one side of the second opening close to the first opening, the limiting boss is used for abutting against the limiting step surface to form the second limiting structure, and a communicating passage which is through and communicated with the valve cavity passage is axially arranged on the movable plugging valve core.

Preferably, the automatic reset assembly further comprises a connecting rod, a first end of the connecting rod is fixedly arranged with the movable plugging valve core, a second end of the connecting rod is slidably connected with the fixed valve core, one end of the reset elastic element is fixedly arranged with the second end of the connecting rod, and the other end of the reset elastic element is abutted against the fixed valve core; the second end of the connecting rod penetrates through the fixed valve core and is positioned on one side, far away from the movable blocking valve core, of the fixed valve core, the reverse circulation acting element is detachably connected to the second end of the connecting rod and extends in the radial direction, a through passage through which liquid flows is arranged on the reverse circulation acting element, and a connecting and fixing structure used for connecting a pipeline is arranged on the inner wall of the valve cavity passage between the fixed valve core and the reverse circulation acting element.

The invention also provides an oil well sand washing operation matching assembly which comprises the lifting short-circuit type automatic continuous positive and negative circulating valve, wherein the first opening and the third opening are respectively arranged at two ends of the valve body, which are both used for connecting an oil pipe.

The technical scheme provided by the application can comprise the following beneficial effects: in the technical scheme, three openings are arranged on a valve cavity passage, and two openings can be communicated each time through displacement adjustment of a movable plugging valve core on the valve cavity passage, so that two different flow passages are formed for switching use; simultaneously, a valve structure possesses and can realize two flow path's switching switch-over, and realize two flow path's switching-over through the displacement of same part, compare in the combination formula switching-over valve that possesses two independent valve structure among the prior art, not only be convenient for switch over the operation, and the structure is succinct compacter, make the valve possess the structure basis that reduces valve body length, even the length of valve body compares in the oil well switching-over valve among the prior art and can reduce, thereby the valve in this application, use in the sand washing operation, not only can realize continuous sand washing operation, can also reduce the construction degree of difficulty and loaded down with trivial details, improve the operating efficiency.

The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the application are described in detail in the following.

Drawings

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

FIG. 1 is a schematic diagram of a first conducting state of a short-circuit type automatic continuous positive and negative circulation lifting valve according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a second conducting state of the short-circuit type automatic continuous positive and negative circulation lifting valve according to an embodiment of the present invention.

In fig. 1-2:

1. a valve body; 2. movably plugging the valve core; 3. a connecting rod; 4. a second pressure spring; 5. a connecting pin; 6. fixing the valve core; 7. a third opening; 8. a restoring elastic member; 9. a reverse circulation effector; 10. a boss; 11. a second opening.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

An object of this embodiment is to provide an promote automatic continuous positive reverse circulation valve of short circuit formula, a valve structure can realize switching on of two circulation passageways, also be convenient for switch over the operation, compare the switching-over valve that has two independent valve structures among the prior art, overall structure is succinct compact, can reduce valve body length, use on the sand washing operation, have the effect of realizing continuous sand washing, safe control, when also having reduced change oil pipe, the degree of difficulty and the loaded down with trivial details degree brought for the construction, improve the operating efficiency. The purpose of this embodiment is also to provide an oil well sand washing operation kit including this promote automatic continuous positive and negative circulation valve of short circuit formula.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the invention recited in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1-2, the present embodiment provides a short-circuit lifting type automatic continuous forward/reverse circulation valve, which includes a valve body 1 and a movable plugging valve element 2, wherein the valve body 1 is provided with a valve cavity passage, the valve cavity passage is distributed with a first opening, a second opening 11 and a third opening 7, the movable plugging valve element 2 is movably disposed in the valve cavity passage, and the movable plugging valve element can movably include a translation and a rotation; when the movable closing off spool 2 is in the first position, shown in fig. 1, the first opening communicates with the third opening 7 and forms a flow path, and when the movable closing off spool 2 is in the second position, shown in fig. 2, the second opening 11 communicates with the third opening 7 and forms another flow path. That is, in one valve structure, two flow paths through which liquid flows are provided and can be realized by three openings and one movable shutoff valve element 2, and switching conduction of the two flow paths can be realized by displacement of the same component. The whole structure is simple and compact, and the opening and closing switching of the two flow passages can be realized by one switching action. Compare in prior art, the combination formula switching-over valve that possesses two independent valve structures, not only be convenient for switch over the operation, and the structure is succinct compacter for the valve possesses the structure basis that reduces 1 length of valve body, even the length of valve body 1 compares in prior art's oil well switching-over valve and can reduce.

The valve cavity passage is generally in a long hole shape, and for convenience of understanding, the extending direction of the valve cavity passage is uniformly referred to as an axial direction and the direction perpendicular to the extending direction is referred to as a radial direction in the application. It should be emphasized that this is not a limitation on the shape and configuration of the valve chamber passageway, which may be non-circular in cross-section or may be a curved extension of the valve chamber passageway other than a straight bore.

In theory, the first opening and the second opening 11 may be axially distributed or radially distributed, and the third opening 7 may be located between the two openings or located at one axial side of the two openings. The movable plugging valve core 2 performs reciprocating sliding displacement or rotating displacement between the first opening and the second opening 11 to switch plugging. The position for closing the first opening is the second position, and the position for closing the second opening 11 is the first position. If the lifting short-circuit type automatic continuous forward and reverse circulation valve is applied to sand washing equipment of an oil well, preferably, the third opening 7 and the first opening are arranged at intervals and coaxially along the extension direction of the valve cavity passage, the second opening 11 is positioned between the third opening 7 and the first opening and is arranged on the side wall of the valve cavity passage, and the movable plugging valve element 2 is displaced in a reciprocating manner along the direction from the first opening to the second opening 11; according to the arrangement, the first opening and the third opening 7 can be correspondingly arranged at the two axial ends of the valve body 1, the valve body 1 is integrally tubular, the structure is simple, compact and thin, and components such as a valve seat and the like are not needed, the two ends of the valve body 1 are directly connected with an oil pipe and a sand washing liquid pipeline, so that the structural condition that the oil pipe needs to be put into a well and needs to be coaxially connected with the sand washing liquid pipeline is met, in addition, the overall length of the valve body 1 can be further reduced on the structural condition, and the hoisting is prevented from being influenced; on the other hand, whole valve body 1 is the tubular column form, and the diameter can match the setting with oil pipe, can not form protruding section on the tubular column of lower income oil well, can not cause the influence that reduces the space to the annular space between oil pipe and the wall of a well, and reduction that can the very big degree is washed sand liquid and grit when flowing back to ground in the annular space, because the annular space is little and the stifled condition of card that produces has the significance effect smoothly with the convenience to guaranteeing the construction.

When the valve provided by the embodiment is applied to sand washing operation, one side of the first opening and one side of the third opening 7 of the valve cavity passage can be respectively used for connecting an oil pipe and a source pipeline of sand washing liquid, such as a hose, and the second opening 11 can be used for connecting a standby pipeline of the sand washing liquid. When normal sand washing is carried out, the flow passage communicated with the first opening and the third opening 7 is used, when an oil pipe needs to be replaced, the passage of the first opening and the third opening 7 is cut off, the flow passage of the second opening 11 and the third opening 7 is communicated, continuous sand washing is carried out by using a standby pipeline, then the pipeline on one side of the first opening is disconnected, oil pipe connection replacement is carried out, after a new oil pipe is installed in place, a valve is reused for connecting a source pipeline and the new oil pipe, at the moment, the standby pipeline is stopped, the flow of the first opening and the third opening 7 is switched back again, the connection of the standby pipeline and the second opening 11 of the previous valve is disconnected, the oil pipe can be continuously pushed into the well, and preparation for channel switching is also made when the oil pipe is replaced next time. By the arrangement, the lifting short-circuit type automatic continuous positive and negative circulating valve in the embodiment is applied to sand washing operation, can realize connection sand washing operation, does not stop pumping and does not stop sand washing in the whole sand washing operation process, can realize opening and closing switching of two passages by one action, can improve operation and control safety, is simple and convenient to construct and improves operation efficiency compared with two actions; meanwhile, the overall length of the valve body 1 is reduced, the structure is simple, the overall non-standard length and weight of the installed pipe column can be reduced, the installation can be realized without replacing the matched lifting rings corresponding to the specifications, the construction difficulty and complexity can be reduced, and the operation efficiency is improved.

Further, in this embodiment, the lifting short-circuit type automatic continuous forward/reverse circulation valve further comprises an automatic resetting component, when liquid flows into the valve cavity passage through one side of the first opening, the movable plugging valve element 2 displaces to the first position, and the automatic resetting component generates induction change, so that the passage formed by the first opening and the third opening 7 is communicated; when the liquid flow from one side of the first opening in the valve cavity passage becomes small or disappears, the change formed by the automatic reset component is restored and drives the movable plugging valve core 2 to displace to the second position, so that the passage formed by the second opening 11 and the third opening 7 is communicated. So set up, can accomplish valve switching and route switching automatically according to the mobile state of liquid, the operation has been portably made, the staff only need adjust the pump sending source of sand washing liquid can, need not also carry out the switching operation of flow path to this valve, avoided in the sand washing operation, the staff need be along with the frequent change of many oil pipes, and the link of frequently switching operation is carried out to the valve, the very apparent simple and convenient operation, effectively improve convenience and construction work efficiency, also avoided the staff to the valve operation error can lead to the hidden danger of operation incident.

Specifically, the automatic resetting component may be an electromagnetic induction component, for example, including an induction switch disposed on the valve cavity passage, and an electromagnet electrically connected to the induction switch, the electromagnet is magnetically attached to the movable plugging valve element 2, when the liquid flow flows through the induction area of the induction switch, the plugging member is attracted and displaced, moves away from the position for plugging the first opening, and moves to the position for plugging the second opening 11, and when the liquid in the induction area disappears, the movable plugging valve element 2 resets again; alternatively, the automatic reset assembly may be a purely mechanical structure, such as a lever structure, a compression spring, a tension spring, or an assembly including elastic members. In the preferred scheme, the automatic reset component can be a pure mechanical structure, so that the circuit setting can be avoided, a circuit waterproof measure is not required, the structure is simpler, the installation is simpler, and the operation and construction are more facilitated.

Specifically, in this embodiment, the automatic resetting assembly includes the elastic resetting member 8, when the liquid flows into the valve cavity passage through the first opening, the movable plugging valve element 2 is pushed by the liquid to displace to the first position, and the elastic resetting member 8 generates elastic deformation, and when the pushing force of the liquid flowing in through the first opening weakens or disappears, the elastic resetting member 8 restores the elastic deformation and drives the movable plugging valve element 2 to return to the second position. The reset elastic piece 8 and the movable plugging valve core 2 can be arranged and connected along the axial direction of the valve cavity passage.

When the first opening and the third opening 7 are distributed along the axial direction and are arranged in the same axial direction, the second opening 11 is positioned between the first opening and the third opening and is formed by a side opening hole in the radial direction, the movable plugging valve element 2 is displaced between the first opening and the third opening 7, and in order to ensure the smooth conduction of the passage, the first opening is arranged in the passage of the valve cavity, and the diameter of the first opening is smaller than that of the section of the passage of the valve cavity. In this embodiment, promote automatic continuous positive and negative circulating valve of short circuit formula still including the fixed case 6 of shutoff in the valve pocket passageway, the periphery wall of fixed case 6 supports with the internal perisporium of valve pocket passageway and forms sealedly, can also be provided with the sealing member between the two, simultaneously, is seted up on the fixed case 6 and is the first opening that link up form along the axial to the valve pocket passageway of communicating fixed case 6 axial both sides. The movable plugging valve core 2 can be a valve cavity passage with a diameter smaller than that of the valve cavity and the side wall of the valve cavity passage with the second opening 11 is displaced, so that the second opening 11 can be plugged, and after the movable plugging valve core 2 leaves the position for plugging the first opening, the valve cavity passage from the first opening to the third opening 7 can be smoothly communicated and cannot be cut off by the movable plugging valve core 2. Or, the movable plugging valve core 2 may be a cylindrical shaft section including a pipe, and the diameter of the shaft section is matched with the diameter of the valve cavity passage of the section where the second opening 11 is located, so that the second opening 11 can be plugged and sealed well, and a sealing member may be further disposed between the outer peripheral wall of the shaft section and the inner peripheral wall of the valve cavity passage; meanwhile, a communication passage which is through along the axial direction is arranged on the column body section, so that smooth communication between the first opening and the third opening 7 is ensured. In the preferred scheme, for guaranteeing the smooth and easy nature of circulation, activity shutoff case 2 is the block form, is provided with the cavity on the shaft body section promptly, wholly is U type structure, and the lateral wall of cavity is used for sealed second opening 11, and the accent of cavity is offered along the axial and is the intercommunication route that link up the form on first opening, the diapire. So set up, the communicating passage is very little in the axial thickness, can not have thin and long highway section in the valve pocket passageway, avoids influencing the velocity of flow of liquid.

The fixed valve core 6 may also be in a cap shape, and includes a cap brim section and a cap body section, wherein the cap brim section is used for being fixedly connected with the inner wall of the valve cavity passage. The diameter of the cap body section can be smaller than that of the concave cavity of the movable plugging valve core 2, when the movable plugging valve core 2 displaces to plug the first opening, the cap body section extends into the concave cavity of the movable plugging valve core 2, the first opening is formed in the side wall of the cap body section, and the side wall of the movable plugging valve core 2 is plugged. Therefore, the movable plugging valve core 2 can be used for smoothly plugging and effectively sealing the first opening, and the phenomenon that the first opening is too long and thin and influences the flow speed due to the fact that the solid thickness of the fixed valve core 6 in the axial direction is too large can be prevented.

Through setting up fixed case 6, when activity shutoff case 2 shifted to the second position, the shutoff first opening and with fixed case 6 counterbalance and form first limit structure. Through this first limit structure, can guarantee that movable shutoff case 2 removes to target in place, accurate, can not produce the displacement position not accurate and the shutoff is not in place and leads to the problem that causes the water leakage.

Further, the valve cavity passage is further provided with a second limiting structure for limiting the displacement position of the movable plugging valve core 2 from the first opening to the second opening 11, and the second limiting structure is arranged on the moving path of the movable plugging valve core 2 from the second position to the first position, so that the first position forms a displacement terminal point of the movable plugging valve core 2.

Specifically, the movable blocking valve element 2 includes a column body section for blocking the second opening 11, and further includes a limiting boss protruding from the column body section along the radial direction, the limiting boss is located on one side of the column body section closer to the first opening, a limiting step surface is arranged on the inner wall of the valve cavity passage on one side of the second opening 11 close to the first opening, and the limiting boss is used for abutting against the limiting step surface and forming a second limiting structure. As shown in the attached drawings, the inner diameters of the valve cavity passages are different, the limiting step surfaces arranged along the radial direction are used as boundaries, the diameter of the section at the second opening 11 is matched with that of the column body section, and the diameter of the section between the second opening 11 and the first opening is matched with the overall diameter of the limiting boss of the movable plugging valve core 2. When the movable plugging valve core 2 moves from the first opening to the second opening 11, the movable plugging valve core moves to the position limiting boss to abut against the surface of the position limiting step, and reaches the moving terminal point, the column body section just plugs the second opening 11, namely, the movable plugging valve core has moved to the first position.

The automatic reset assembly further comprises a connecting rod 3, wherein the first end of the connecting rod is fixedly arranged with the movable plugging valve core 2, the second end of the connecting rod is in sliding connection with the fixed valve core 6, one end of a reset elastic part 8 is fixedly arranged with the second end of the connecting rod 3, and the other end of the reset elastic part is abutted against the fixed valve core 6. The stable displacement of the movable plugging valve core 2 can be ensured through the combined structure of the connecting column and the reset elastic piece 8.

The elastic restoring element 8 can be a first pressure spring and is sleeved on the connecting column. The second end of the connecting column can be provided with a boss 10 which is abutted against the end part of the first pressure spring, or a fixing pin for hooking the first pressure spring is arranged. The second end of the connecting column penetrates through the bottom wall of the cap body section of the fixed valve core 6 and is positioned on one side of the fixed valve core 6, which is far away from the movable plugging valve core 2, the reset elastic part 8 is also arranged on the side, and the other end of the reset elastic part 8 is abutted against the bottom wall.

The movable plugging valve element 2 can be directly abutted against the fixed valve element 6, or, as shown in fig. 1, the first limiting structure comprises a second pressure spring 4 sleeved on the connecting rod 3 and a connecting pin 5 hooked with one end of the second pressure spring 4, the connecting pin 5 is fixed on the connecting rod 3, the second pressure spring 4 is located in the concave cavity of the movable plugging valve element 2, and the other end of the second pressure spring abuts against the bottom wall of the concave cavity. The diameter of the through hole for the connecting column to pass through on the fixed valve core 6 is smaller than the outer diameter of the second pressure spring 4. When the movable plugging valve core 2 moves towards the fixed valve core 6 until the second pressure spring 4 abuts against the fixed valve core 6, the movable plugging valve core 2 reaches the second position and seals the first opening at the same time. So set up, can cushion the impact of activity shutoff case 2 to fixed case 6, increase of service life.

In the sand washing operation of an oil well, the sand washing operation is divided into two operation modes of positive sand washing and back sand washing, the liquid flow directions of the positive sand washing and the back sand washing are opposite, the positive sand washing refers to that sand washing liquid flows from an oil pipe to the underground, sand and stone are returned to a wellhead from an annulus, and the back sand washing refers to that the sand washing liquid washes into the well from the annulus, so that the sand and stone return to the ground along with the upward flow of the liquid from the oil pipe. Circulating valves in the prior art are all of one-way valve structures, and if the positive sand washing and the back sand washing need to be switched, the valves need to be replaced, the positive circulating valve is integrally disassembled, the reverse circulating valve is replaced, and the operation is complex and the efficiency is low. In order to solve the problem, in the embodiment, the short-circuit lifting type automatic continuous positive and negative circulation valve further comprises a reverse circulation acting element 9, when the movable plugging valve element 2 is located at the first position, the reverse circulation acting element 9 directly or indirectly presses against the movable plugging valve element 2 and overcomes the reset force of the reset elastic element 8 to fix the movable plugging valve element 2 at the first position, so that when liquid flows from the third opening 7 to the first opening to impact the movable plugging valve element 2, the movable plugging valve element 2 can be maintained at the first position, the sealing of the second opening 11 and the conduction of the first opening are ensured, and the liquid can smoothly flow in from the third opening 7 and flow out through the first opening. So set up, the automatic positive and negative circulating valve in succession of promotion short circuit formula that this embodiment provided can form the valve structure of two-way circulation, both can carry out the forward liquid and flow, also can carry out reverse liquid and flow, and the ascending flow of each side, all has two circulation route to be optional, has high practicality and convenient usability.

When liquid is required to flow in from the third opening 7 and flow out through the second opening 11, the pressing action of the reverse circulation acting element 9 on the movable shutoff valve core 2 can be removed, and the reverse circulation acting element 9 and the valve body 1 can be detachably arranged. Of course, in the sand washing operation, it is usually necessary to open the first opening when performing back-flushing.

Specifically, the following structure can be used: the reverse circulation acting part 9 is detachably connected to the second end of the connecting rod 3 and extends along the radial direction of the valve cavity passage, a through passage for liquid to flow through is arranged on the reverse circulation acting part 9, and meanwhile, a connecting and fixing structure for connecting a pipeline is arranged on the inner wall of the valve cavity passage between the fixed valve core 6 and the reverse circulation acting part 9. When the back flushing sand operation is needed and the positive and negative flow directions of the liquid need to be changed, a new pipe joint is connected at one end of the valve body 1 close to the first opening, the pipe joint extends into the valve cavity passage and can press against the reverse circulation acting piece 9 arranged along the radial direction and push the connecting rod 3 to drive the movable plugging valve core 2 to move towards the second opening 11, when the pipe joint is fixed with the valve body 1 through the connecting and fixing structure, the reverse circulation acting piece 9 is pressed against the fixed valve core 6, and meanwhile, the movable plugging valve core 2 is located at the first position for sealing the second opening 11. In this way, even when the movable shutoff valve element 2 is subjected to the impact of the liquid flowing in from the third port 7, the continuity between the first port and the third port 7 can be ensured and maintained.

The reverse circulation acting member 9 may comprise blades circumferentially spaced apart from each other, and the space between each two adjacent blades forms a through passage for the liquid to flow through, and the blades are adapted to abut against the pipe joint.

Of course, the reverse circulation-acting member 9 is not limited to the above-described one structure and one arrangement, and may be a push rod telescopically coupled to one side of the fixed valve element 6. However, the arrangement structure of the reverse circulation acting member 9 is very simple, and does not need to additionally arrange power acting on the reverse circulation acting member 9, and does not occupy a large volume space.

The embodiment also provides a matching assembly for oil well sand washing operation, which comprises the lifting short-circuit type automatic continuous positive and negative circulating valve as in any one of the above embodiments, wherein the first opening and the third opening 7 are respectively arranged at two ends of the valve body 1, which are both used for connecting an oil pipe. By the arrangement, the oil well sand washing operation matching assembly provided by the embodiment is applied to sand washing operation, can realize connection sand washing operation, and does not stop a pump and sand washing in the whole sand washing operation process; meanwhile, the overall length of the valve body 1 between the oil pipes is reduced, the structure is simple, the overall nonstandard length and weight of the installed pipe column can be reduced, and the installation can be realized without replacing a matched lifting ring with a corresponding specification; overall, realize continuous sand washing and simple and convenient construction, reduce the construction degree of difficulty and loaded down with trivial details degree, improve the operating efficiency. The derivation process of the beneficial effect is substantially similar to the derivation process of the beneficial effect brought by the lifting short-circuit type automatic continuous forward and reverse circulation valve, and the description is omitted here.

It should be noted that the terms "first," "second," and the like, as used herein, are not intended to limit the specific order, but merely to distinguish one element or function from another. The described horizontal, vertical, up, down, left and right are indicated when the lifting short-circuit type automatic continuous positive and negative circulating valve is in a natural placing state.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the invention comprise basic schemes, are independent from each other and are not restricted with each other, but can be combined with each other under the condition of no conflict, so that multiple effects are realized together.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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.