Lifting short-circuit automatic continuous forward and reverse circulation valve and oil well sand flushing operation supporting components

Abstract

The present invention relates to the field of valve switch technology, and discloses a lifting short-circuit automatic continuous forward and reverse circulation valve and an oil well sand flushing operation supporting component, comprising a valve body and a movable blocking valve core, wherein the valve body is provided with a valve cavity passage, and the valve cavity passage is provided with a first opening, a second opening, and a third opening, and the movable blocking valve core is movably arranged in the valve cavity passage. When the movable blocking valve core is in a first position, the first opening is connected to the third opening and forms a flow passage, and when the movable blocking valve core is in a second position, the second opening is connected to the third opening and forms another flow passage. As described above, a valve structure can realize the switching conduction of two flow passages, which is convenient for switching operation. The overall structure is simple and compact, and the length of the valve body is reduced. When used in sand flushing operations, it has the effect of realizing continuous sand flushing and safe operation, reducing the difficulty and tediousness of construction when replacing oil pipes, and improving operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of valve switches, and more particularly to a lifting short-circuit automatic continuous forward and reverse circulation valve and a matching component for oil well sand flushing operations. Background Art

[0002] Sand flushing is a key step in oilfield well operations. This involves connecting a pump and a fluid line (usually a hose) to the tubing. The tubing is then lowered into the well. Flushing fluid is pumped through the hose and tubing, exiting the tubing's end, impacting the sand at the wellbore. The dispersed sand and gravel mix with the flushing fluid and return to the surface along the annulus between the tubing and the wellbore wall. As the sand and gravel at the wellbore are dispersed, the tubing is advanced into the well. Once a tubing is advanced, the hose is disconnected from the tubing, and a new tubing is reconnected. This process, commonly known as tubing replacement, allows for continued sand flushing and tubing advancement. This cycle continues until all the sand in the well has been flushed to the surface.

[0003] In conventional sand flushing operations, each time the tubing is replaced, the sand flushing operation must be stopped. Stopping the pump to connect a single tubing not only affects the efficiency of sand flushing, but also causes problems such as suspended sand sinking and easy jamming of the tubing string. Moreover, this conventional method is not convenient for the development of downhole sand position detection technology. Therefore, there is an urgent need for continuous sand flushing technology without stopping the pump. Currently, there are two forms of continuous sand flushing methods: one is to use a continuous tubing operation machine to flush sand, which requires professional equipment and operators and is inconvenient to promote on-site; the other is to use conventional tubing and continuous sand flushing technology that switches direction in the casing. In this method, since the circulation valves used on the tubing in the existing technology have a single function and are all one-way, one-way valves, it is necessary to install a reversing circulation valve composed of two independent circulation valve structures on the tubing to switch the flow direction. The combined reversing circulation valve and valve accessories have a complex structure, including a valve seat, a valve pipe and complex components inside the valve, and the overall length of the valve body is large. Connecting it to the oil pipe will increase the length and weight of the pipe string, resulting in insufficient load for the conventional lifting ring that comes with the oil pipe when replacing the oil pipe, and a lifting ring with a larger load needs to be replaced for construction. In addition, the installation of the combined reversing valve also requires lowering a longer sealing cylinder into the well, which will increase the difficulty of construction, making on-site construction inconvenient and affecting work efficiency.

[0004] In order to solve the above problems, it is necessary to propose a circulation valve with a simpler structure to achieve continuous sand flushing and reduce the complexity or difficulty of the operation. Summary of the Invention

[0005] The present invention aims to provide a lifting short-circuit automatic continuous forward and reverse circulation valve. A single valve structure can achieve switching between two flow paths, facilitating switching operations. Compared to the prior art reversing valves with two independent valve structures, the overall structure is simple and compact, reducing valve body length. When used in sand flushing operations, it achieves continuous sand flushing and safe operation, while also reducing the difficulty and complexity associated with oil pipe replacement, thereby improving operational efficiency. The present invention also aims to provide an oil well sand flushing assembly including the lifting short-circuit automatic continuous forward and reverse circulation valve.

[0006] To achieve the above-mentioned purpose, the present invention provides a lifting short-circuit type automatic continuous forward and reverse circulation valve, including a valve body and a movable sealing valve core, the valve body is provided with a valve cavity passage, the valve cavity passage is distributed with a first opening, a second opening and a third opening, the movable sealing valve core is movably arranged in the valve cavity passage, when the movable sealing valve core is in the first position, the first opening is connected with the third opening and forms a flow passage, when the movable sealing valve core is in the second position, the second opening is connected with the third opening and forms another flow passage.

[0007] Preferably, it also includes an automatic reset component. When liquid flows into the valve cavity passage through the first opening side, the movable sealing valve core is displaced to the first position and the automatic reset component produces an inductive change. When the liquid flow from the first opening side of the valve cavity passage becomes smaller or disappears, the change of the automatic reset component is restored and drives the movable sealing valve core to be displaced to the second position.

[0008] Preferably, the automatic reset component includes a reset elastic member. When liquid flows into the valve cavity through the first opening, the movable sealing valve core is displaced to the first position by the thrust of the liquid and the reset elastic member generates elastic deformation. When the thrust of the liquid flowing in through the first opening weakens or disappears, the reset elastic member restores the elastic deformation and drives the movable sealing valve core back to the second position.

[0009] Preferably, it further includes a fixed valve core that blocks 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, it blocks the first opening and offsets against the fixed valve core to form a first limiting structure.

[0010] Preferably, a second position-limiting structure is further provided on the valve cavity passage, which enables the first position to form a displacement end point of the movable blocking valve core.

[0011] Preferably, a reverse circulation acting member is further included for pressing the movable blocking valve core against the first position, so that when liquid flows from the third opening toward the first opening, the movable blocking valve core can be maintained in the first position.

[0012] Preferably, the third opening and the first opening are spaced apart and coaxially arranged along the extension direction of the valve cavity passage, the second opening is located between the third opening and the first opening and is opened on the side wall of the valve cavity passage, and the movable sealing valve core moves back and forth in the direction from the first opening to the second opening.

[0013] Preferably, the movable sealing valve core includes a column section for sealing the second opening and a limiting boss radially protruding from the column section, and a limiting step surface is provided on the inner wall of the valve cavity passage on the side of the second opening close to the first opening, and the limiting boss is used to abut against the limiting step surface and form the second limiting structure, and a connecting passage is axially opened on the movable sealing valve core, which is through-shaped and connected to the valve cavity passage.

[0014] Preferably, the automatic reset component also includes a connecting rod with a first end fixed to the movable blocking valve core and a second end slidingly connected to the fixed valve core, one end of the reset elastic member is fixed to the second end of the connecting rod, and the other end is against the fixed valve core; the second end of the connecting rod passes through the fixed valve core and is located on the side of the fixed valve core away from the movable blocking valve core, the reverse circulation acting member is detachably connected to the second end of the connecting rod and extends radially, the reverse circulation acting member is provided with a through passage for liquid to flow through, and a connecting and fixing structure for connecting a pipeline is provided on the inner wall of the valve cavity passage between the fixed valve core and the reverse circulation acting member.

[0015] The present invention also provides an oil well sand flushing operation supporting component, comprising a lifting short-circuit automatic continuous forward and reverse circulation valve as described in any of the above items, wherein the first opening and the third opening are respectively arranged on the valve body and are used to connect the two ends of the oil pipe.

[0016] The technical solution provided by the present application may include the following beneficial effects: in the technical solution, three openings are provided on the valve cavity passage. By adjusting the displacement of the movable sealing valve core on the valve cavity passage, two of the openings can be opened at a time, thereby forming two different flow passages for switching. When applied to sand flushing operations, when the oil pipe needs to be replaced, the flow passage of the sand flushing liquid is switched, and the oil pipe can be replaced without stopping the sand flushing; at the same time, a valve structure has and can realize the switching and conduction of the two flow passages, and the switching of the two flow passages is realized by the displacement of the same component. Compared with the combined reversing valve with two independent valve structures in the prior art, it is not only convenient to perform switching operations, but also has a simpler and more compact structure, so that the valve has a structural basis for reducing the length of the valve body. Even if the length of the valve body is reduced compared with the oil well reversing valve in the prior art, the valve in the present application, when applied to sand flushing operations, can not only realize continuous sand flushing operations, but also reduce the difficulty and complexity of construction, thereby improving work efficiency.

[0017] The various technical effects that can be produced by the preferred technical solutions among the many technical solutions provided in this application are described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of a first conduction state of a lifting short-circuit automatic continuous forward and reverse circulation valve according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the second conduction state of the lifting and short-circuiting automatic continuous forward and reverse circulation valve in an embodiment of the present invention.

[0021] Figure 1-Figure 2 middle:

[0022] 1. Valve body; 2. Movable sealing valve core; 3. Connecting rod; 4. Second compression spring; 5. Connecting pin; 6. Fixed valve core; 7. Third opening; 8. Reset elastic member; 9. Reverse circulation member; 10. Boss; 11. Second opening. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0024] The purpose of this specific embodiment is to provide a lifting short-circuit automatic continuous forward and reverse circulation valve. A single valve structure can switch between two flow paths, facilitating switching operations. Compared to the existing reversing valves with two independent valve structures, the overall structure is simple and compact, reducing the length of the valve body. Application in sand flushing operations achieves continuous sand flushing and safe operation, while also reducing the difficulty and complexity associated with oil pipe replacement, thereby improving operational efficiency. This specific embodiment also aims to provide an oil well sand flushing assembly including this lifting short-circuit automatic continuous forward and reverse circulation valve.

[0025] The following embodiments are described in detail with reference to the accompanying drawings. Furthermore, the embodiments described below do not limit the invention as set forth in the claims. Furthermore, the entire contents of the configurations shown in the following embodiments are not necessarily required to serve as solutions to the invention as set forth in the claims.

[0026] Please refer to the attached Figure 1-2 The present embodiment provides a lifting short-circuit automatic continuous forward and reverse circulation valve, comprising a valve body 1 and a movable blocking valve core 2. The valve body 1 is provided with a valve cavity passage, and the valve cavity passage is provided with a first opening, a second opening 11 and a third opening 7. The movable blocking valve core 2 is movably arranged in the valve cavity passage, and the movable movement includes translation and rotation. When the movable blocking valve core 2 is in the first position, Figure 1 As shown in FIG, the first opening is connected to the third opening 7 and forms a flow passage. When the movable blocking valve core 2 is in the second position, Figure 2 As shown in the figure, the second opening 11 is connected to the third opening 7 and forms another flow path. That is, in a valve structure, three openings and a movable blocking valve core 2 are provided with and can realize two flow paths for liquid to flow through, and the switching and conduction of the two flow paths can be realized by the displacement of the same component. The overall structure is simple and compact, and the opening and closing of the two flow paths can be realized by one switching action. Compared with the prior art, the combined reversing valve with two independent valve structures is not only convenient for switching operations, but also has a simpler and more compact structure, so that the valve has a structural basis for reducing the length of the valve body 1, that is, the length of the valve body 1 can be reduced compared with the oil well reversing valve in the prior art.

[0027] The valve cavity passageway is typically in the shape of an elongated hole. For ease of understanding, this application uniformly refers to the direction of extension of the valve cavity passageway as the axial direction, and the direction perpendicular to the extension direction as the radial direction. However, it should be emphasized that this does not limit the shape and structure of the valve cavity passageway. The cross-section of the valve cavity passageway may be non-circular, and the valve cavity passageway may also have a curved extension structure other than a straight hole.

[0028] Theoretically, the first opening and the second opening 11 can be distributed axially or radially, and the third opening 7 can be located between the two openings or on one axial side of the two openings. The movable blocking valve core 2 slides back and forth or rotates between the first opening and the second opening 11 to switch the blocking. The position for blocking the first opening is the above-mentioned second position, and the position for blocking the second opening 11 is the above-mentioned first position. If the lifting short-circuit automatic continuous forward and reverse circulation valve in the present application is applied to the sand flushing equipment of the oil well, preferably, the third opening 7 and the first opening are spaced and arranged coaxially along the extension direction of the valve cavity 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 cavity passage, and the movable blocking valve core 2 moves back and forth in the direction from the first opening to the second opening 11; in this way, the first opening and the third opening 7 can be correspondingly arranged at the axial ends of the valve body 1, and the valve body 1 is in the shape of a tubular column as a whole, with a simple, compact and thin structure, and does not require parts such as a valve seat. The two ends of the valve body 1 are directly connected to the oil pipe and the flushing The sand and liquid pipeline is sufficient, which not only meets the structural situation that the oil pipeline needs to be lowered into the well and needs to be coaxially connected with the sand flushing liquid pipeline, but also, in this structural situation, the overall length of the valve body 1 can be further shortened to avoid affecting the lifting; on the other hand, the entire valve body 1 is in the shape of a tubular column, and the diameter can be matched with the oil pipe. No bulge section will be formed on the tubing column lowered into the oil well, and the annulus between the oil pipe and the well wall will not be affected by the reduction of the space. It can greatly reduce the blockage caused by the small annular space when the sand flushing fluid and sand and gravel flow back to the ground in the annulus, which has a significant effect on ensuring smooth and convenient construction.

[0029] When the valve provided in this embodiment is used in sand flushing operations, the first opening side and the third opening side 7 of the valve cavity passage can be used to connect the oil pipe and the source pipe of the sand flushing fluid, such as a water hose, respectively, while the second opening 11 can be used to connect the backup pipe of the sand flushing fluid. When performing regular sand flushing, the flow path connecting the first opening and the third opening 7 is used. When the oil pipe needs to be replaced, the flow path between the first opening and the third opening 7 is cut off, and the flow path between the second opening 11 and the third opening 7 is connected. The backup pipe is used for continuous sand flushing, and then the pipe on the first opening side is disconnected to replace the oil pipe connection. After the new oil pipe is installed, the source pipe and the new oil pipe are reconnected using a new valve. At this time, the backup pipe is deactivated, and the flow is switched back to the first opening and the third opening 7. The backup pipe is disconnected from the second opening 11 of the previous valve, allowing the oil pipe to continue to advance into the well and preparing for the passage switch when the oil pipe is replaced next time. With such an arrangement, the lifting short-circuit automatic continuous forward and reverse circulation valve in this embodiment is used in sand flushing operations, which can realize the connection of sand flushing operations. The pump and sand flushing are not stopped during the entire sand flushing operation, and one action can realize the opening and closing switching of the two passages. Compared with two actions, it can improve the control safety, simplify the construction, and improve the working efficiency; at the same time, the overall length of the valve body 1 is reduced, the structure is simple, and the non-standard length and weight of the entire pipe string after installation can be reduced. There is no need to replace the matching lifting rings of corresponding specifications to achieve installation. From this level, it can also reduce the difficulty and complexity of construction and improve working efficiency.

[0030] Furthermore, in this embodiment, the lift-type short-circuit automatic continuous forward and reverse circulation valve also includes an automatic reset mechanism. When liquid flows into the valve cavity through the first opening, the movable blocking valve core 2 is displaced to the first position, and the automatic reset mechanism is induced to change, thereby connecting the passage formed by the first opening and the third opening 7. When the liquid flow in the valve cavity from the first opening decreases or disappears, the change in the automatic reset mechanism is restored, and the movable blocking valve core 2 is driven to the second position, connecting the passage formed by the second opening 11 and the third opening 7. This arrangement automatically opens and closes the valve and switches the passage according to the flow state of the liquid, simplifying operation. Workers only need to adjust the pumping source of the sand flushing liquid and no longer need to switch the flow passage of the valve. This avoids the need for workers to frequently switch the valve due to the frequent replacement of multiple oil pipes during sand flushing operations. This significantly simplifies operation, effectively improves convenience and construction efficiency, and avoids the potential risk of accidents caused by workers' incorrect valve operation.

[0031] Specifically, the automatic reset component can be an electromagnetic induction component, such as a sensing switch provided on the valve cavity passage, an electromagnet electrically connected to the sensing switch, and a magnetically adsorbed connection between the electromagnet and the movable blocking valve core 2. When the liquid flows through the sensing area of the sensing switch, the blocking component is adsorbed and displaced, leaving the position of blocking the first opening and moving to the position of blocking the second opening 11. When the liquid in the sensing area disappears, the movable blocking valve core 2 is reset. Alternatively, the automatic reset component can be a purely mechanical structure, such as a lever structure, a compression spring, a tension spring, or a component including an elastic member. In a preferred embodiment, the automatic reset component can be a purely mechanical structure. Such a configuration can avoid wiring setup and the need for waterproofing measures for the wiring, resulting in a simpler structure, simpler installation, and more convenient operation and construction.

[0032] Specifically, in this embodiment, the automatic reset component includes a reset elastic member 8. When liquid flows into the valve cavity through the first opening, the movable blocking valve core 2 is displaced to the first position by the thrust of the liquid, and the reset elastic member 8 is elastically deformed. When the thrust of the liquid flowing through the first opening weakens or disappears, the reset elastic member 8 resumes its elastic deformation and drives the movable blocking valve core 2 back to the second position. The reset elastic member 8 and the movable blocking valve core 2 can be arranged and connected along the axial direction of the valve cavity.

[0033] When the first and third openings 7 are axially distributed and coaxially arranged, the second opening 11 is located between the first and third openings and formed by a radial side opening. The movable blocking valve core 2 is displaced between the first and third openings 7. To ensure smooth flow of the passage, the first opening is located within the valve cavity passage and has a diameter smaller than the diameter of the valve cavity passage in that section. In this embodiment, the poppet-type automatic continuous forward and reverse circulation valve further includes a fixed valve core 6 that blocks the valve cavity passage. The outer peripheral wall of the fixed valve core 6 abuts against the inner peripheral wall of the valve cavity passage to form a seal, and a sealing member may be provided between the two. Furthermore, the fixed valve core 6 is provided with an axially through-shaped first opening to connect the valve cavity passage on both axial sides of the fixed valve core 6. The movable blocking valve core 2 may have a diameter smaller than the valve cavity passage and be displaced along the sidewall of the valve cavity passage where the second opening 11 is located. This allows for both blocking the second opening 11 and ensuring that, after leaving the position blocking the first opening, the valve cavity passage from the first opening to the third opening 7 remains smooth and uninterrupted by the movable blocking valve core 2. Alternatively, the movable blocking valve core 2 may include a tubular column section, the diameter of which matches the diameter of the valve cavity passage in the section where the second opening 11 is located. In this way, a good blocking and sealing of the second opening 11 can be achieved, and a sealing member may be provided between the outer peripheral wall of the column section and the inner peripheral wall of the valve cavity passage; and at the same time, a connecting passage is provided on the column section in an axially continuous manner to ensure smooth communication between the first opening and the third opening 7. In the preferred embodiment, in order to ensure smooth circulation, the movable blocking valve core 2 is in the shape of a cap, that is, a concave cavity is provided on the column section, and the overall structure is U-shaped. The side wall of the concave cavity is used to seal the second opening 11, and the cavity mouth of the concave cavity faces the first opening, and a connecting passage is provided on the bottom wall in an axially continuous manner. With such a configuration, the thickness of the connecting passage in the axial direction is very small, and there will be no thin and long sections in the valve cavity passage, thereby avoiding affecting the flow rate of the liquid.

[0034] The fixed valve core 6 can also be in the shape of a cap, including a brim section and a body section, with the brim section being fixedly connected to the inner wall of the valve cavity passage. The diameter of the body section can be smaller than the diameter of the recessed cavity of the movable blocking valve core 2. When the movable blocking valve core 2 moves to block the first opening, the body section extends into the recessed cavity of the movable blocking valve core 2, and the first opening is formed on the side wall of the body section and is blocked by the side wall of the movable blocking valve core 2. In this way, the first opening can be smoothly blocked and effectively sealed by the movable blocking valve core 2, while the fixed valve core 6 can be prevented from having an excessively large physical thickness in the axial direction, which would make the first opening too slender and affect the flow rate.

[0035] By providing a fixed valve core 6, when the movable blocking valve core 2 is moved to the second position, it blocks the first opening and abuts against the fixed valve core 6 to form a first position-limiting structure. This first position-limiting structure ensures that the movable blocking valve core 2 moves into position and accurately, and avoids the problem of inaccurate displacement and inadequate blocking, which may cause water leakage.

[0036] Furthermore, a second limiting structure is provided on the valve cavity passage for limiting the displacement position of the movable blocking valve core 2 from the first opening to the second opening 11. The second limiting structure is arranged on the moving path of the movable blocking valve core 2 from the second position to the first position, so that the first position forms a displacement end point of the movable blocking valve core 2. Such a setting can effectively prevent the movable blocking valve core 2 from moving excessively when moving toward the first position, causing the second opening 11 to be poorly sealed and leaking.

[0037] Specifically, the movable blocking valve core 2 includes, in addition to a column section for blocking the second opening 11, a limiting boss radially protruding from the column section. The limiting boss is located on the side of the column section closer to the first opening. A limiting step surface is provided on the inner wall of the valve cavity passage on the side of the second opening 11 closer to the first opening. The limiting boss is used to abut against the limiting step surface and form a second limiting structure. As shown in the accompanying drawings, the internal diameters of the valve cavity passage are different. The limiting step surface provided along the radial direction is used as a dividing line. The diameter of the section at the second opening 11 matches the diameter of the column section, and the diameter of the section between the second opening 11 and the first opening matches the overall diameter of the limiting boss of the movable blocking valve core 2. When the movable blocking valve core 2 moves from the first opening to the second opening 11, moves until the limiting boss abuts against the limiting step surface, and reaches the end point of the movement, the column section just blocks the second opening 11, that is, it has moved to the above-mentioned first position.

[0038] The automatic reset assembly further includes a connecting rod 3, a first end of which is fixedly mounted to the movable blocking valve core 2 and a second end of which is slidably connected to the fixed valve core 6. A reset elastic member 8, one end of which is fixedly mounted to the second end of the connecting rod 3 and the other end of which abuts against the fixed valve core 6. The combined structure of the connecting rod and the reset elastic member 8 ensures stable displacement of the movable blocking valve core 2.

[0039] The resilient reset member 8 can be a first compression spring, mounted on the connecting post. The second end of the connecting post can be provided with a boss 10 that abuts against the end of the first compression spring, or a fixing pin for the first compression spring to hook onto. The second end of the connecting post extends through the bottom wall of the cap section of the fixed valve core 6 and is located on the side of the fixed valve core 6 away from the movable blocking valve core 2. The resilient reset member 8 is also located on this side, with the other end of the resilient reset member 8 abutting against this bottom wall.

[0040] The movable blocking valve core 2 can be directly against the fixed valve core 6, or, as Figure 1As shown, the first limiting structure includes a second compression spring 4 sleeved on the connecting rod 3 and a connecting pin 5 hooked with one end of the second compression spring 4. The connecting pin 5 is fixed to the connecting rod 3. The second compression spring 4 is located in the concave cavity of the movable blocking valve core 2, and the other end is against the bottom wall of the concave cavity. The diameter of the through hole on the fixed valve core 6 for the connecting column to pass through is smaller than the outer diameter of the second compression spring 4. When the movable blocking valve core 2 moves toward the fixed valve core 6 and the second compression spring 4 is against the fixed valve core 6, the movable blocking valve core 2 reaches the second position and also seals the first opening. This arrangement can buffer the impact force of the movable blocking valve core 2 on the fixed valve core 6 and extend its service life.

[0041] Oil well sand flushing operations are divided into two modes: forward sand flushing and backwashing. The fluid flows in opposite directions in forward and backwashing. Forward sand flushing involves the flow of fluid from the tubing downhole, forcing sand and gravel back through the annulus to the wellhead. Backwashing, on the other hand, involves flushing fluid from the annulus into the well, causing sand and gravel to flow upward through the tubing and return to the surface. Existing circulation valves are all one-way valves. Switching between forward and backwashing requires valve replacement: the forward circulation valve must be completely disassembled and replaced with a reverse circulation valve, a cumbersome and inefficient operation. After the lifting short-circuit automatic continuous forward and reverse circulation valve is provided with a first limiting structure, when the liquid flows in from the third opening 7, the movable sealing valve core 2 is impacted by the liquid and presses against the fixed valve core 6, making it impossible to open the first opening. To solve this problem, in this embodiment, the lifting short-circuit automatic continuous forward and reverse circulation valve also includes a reverse circulation acting member 9. When the movable sealing valve core 2 is in the first position, the reverse circulation acting member 9 directly or indirectly presses against the movable sealing valve core 2 and overcomes the reset force of the reset elastic member 8, fixing the movable sealing valve core 2 in the first position, so that when the liquid flows from the third opening 7 to the first opening and impacts the movable sealing valve core 2, the movable sealing valve core 2 can be maintained in the first position, ensuring the sealing of the second opening 11 and the conduction of the first opening, so that the liquid can smoothly flow in from the third opening 7 and flow out through the first opening. With such an arrangement, the lifting short-circuit automatic continuous forward and reverse circulation valve provided in this embodiment can form a valve structure with two-way circulation, which can carry out both forward and reverse liquid flow, and there are two optional flow paths for flow in each direction, which is extremely practical and convenient to use.

[0042] When liquid is required to flow in from the third opening 7 and out through the second opening 11, the pressing action of the reverse circulation member 9 on the movable blocking valve core 2 can be removed, which can be achieved by detachably arranging the reverse circulation member 9 and the valve body 1. Of course, during the sand flushing operation, if backwashing is performed, it is usually necessary to open the first opening.

[0043] Specifically, this can be achieved through the following structure: a reverse circulation member 9 is detachably connected to the second end of the connecting rod 3 and extends radially along the valve cavity passage. The reverse circulation member 9 is provided with a through passage for liquid to flow through. At the same time, a connecting and fixing structure for connecting a pipeline is provided on the inner wall of the valve cavity passage between the fixed valve core 6 and the reverse circulation member 9. When backwashing is required to change the forward and reverse flow directions of the liquid, a new pipe section is connected to the end of the valve body 1 near the first opening. This pipe section extends into the valve cavity passage and presses against the radially arranged reverse circulation member 9, pushing the connecting rod 3 and the movable blocking valve core 2 toward the second opening 11. When the pipe section is fixed to the valve body 1 via the above-mentioned connecting and fixing structure, the reverse circulation member 9 is pressed against the fixed valve core 6, and the movable blocking valve core 2 is in the first position sealing the second opening 11. In this way, when the movable blocking valve core 2 is impacted by liquid flowing in from the third opening 7, it can also ensure and maintain the flow between the first opening and the third opening 7.

[0044] The reverse circulation acting member 9 may include blades distributed at intervals along the circumferential direction, wherein the interval space between each two adjacent blades forms a through passage for the liquid to flow through, and the blades are used to offset the pipe sections.

[0045] Of course, the reverse circulation member 9 is not limited to the above-described structure and configuration. For example, it can also be a retractable push rod connected to one side of the fixed valve core 6. However, the configuration of the reverse circulation member 9 described above is extremely simple, does not require additional power to act on the reverse circulation member 9, and does not occupy a large volume.

[0046] This embodiment also provides an oil well sand flushing operation supporting component, including a lifting short-circuit type automatic continuous forward and reverse circulation valve as described in any of the above embodiments, wherein the first opening and the third opening 7 are respectively provided on the valve body 1 and are used to connect the two ends of the oil pipe. With such a configuration, the oil well sand flushing operation supporting component provided by this embodiment, when used in sand flushing operations, can realize the connection of sand flushing operations, and the pump does not stop or the sand flushing does not stop during the entire sand flushing operation; at the same time, the overall length of the valve body 1 between the oil pipes is reduced, and the structure is simple, which can reduce the non-standard length and weight of the entire pipe string after installation, and can be installed without replacing the corresponding specification of the matching lifting ring; in general, continuous sand flushing is achieved and construction is simple, which reduces the difficulty and complexity of construction and improves operation efficiency. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the lifting short-circuit type automatic continuous forward and reverse circulation valve mentioned above, and will not be repeated in this article.

[0047] It should be noted that the terms "first" and "second" used herein do not limit the specific order but are merely used to distinguish between components or functions. The terms "horizontal," "vertical," "upper," "lower," "left," and "right" used herein refer to the valve when the lift-type automatic continuous forward and reverse circulation valve is in its natural position.

[0048] It is understood that the same or similar parts of the above embodiments can be referenced to each other, and the details not described in detail in some embodiments can be referred to the same or similar contents in other embodiments. The multiple solutions provided by the present invention include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other to achieve multiple effects without conflict.

[0049] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lifting short-circuit automatic continuous forward and reverse circulation valve, characterized in that: The invention comprises a valve body (1) and a movable blocking valve core (2), wherein the valve body (1) is provided with a valve cavity passage, wherein the valve cavity passage is provided with a first opening, a second opening (11) and a third opening (7), and the movable blocking valve core (2) is movably arranged in the valve cavity passage. When the movable blocking valve core (2) is in a first position, the first opening is connected to the third opening (7) to form a flow passage. When the movable blocking valve core (2) is in a second position, the second opening (11) is connected to the third opening (7) to form another flow passage. It also includes an automatic reset component. When liquid flows into the valve cavity passage through the first opening side, the movable blocking valve core (2) is displaced to the first position and the automatic reset component generates an inductive change. When the liquid flow from the first opening side of the valve cavity passage decreases or disappears, the change of the automatic reset component is restored and drives the movable blocking valve core (2) to be displaced to the second position. The automatic reset component includes a reset elastic member (8). When liquid flows into the valve cavity through the first opening, the movable blocking valve core (2) is displaced to the first position by the thrust of the liquid and the reset elastic member (8) generates elastic deformation. When the thrust of the liquid flowing through the first opening weakens or disappears, the reset elastic member (8) recovers the elastic deformation and drives the movable blocking valve core (2) back to the second position. It also includes a fixed valve core (6) for blocking the passage in the valve cavity, the fixed valve core (6) is provided with the first opening, and when the movable blocking valve core (2) moves to the second position, it blocks the first opening and abuts against the fixed valve core (6) to form a first limiting structure; The valve cavity passage is also provided with a second position-limiting structure that enables the first position to form a displacement end point of the movable blocking valve core (2); It also includes a reverse circulation action member (9) for pressing the movable blocking valve core (2) against the first position, so that when liquid flows from the third opening (7) toward the first opening, the movable blocking valve core (2) can be maintained in the first position; The third opening (7) and the first opening are spaced apart and coaxially arranged along the extension direction of the valve cavity 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 cavity passage, and the movable blocking valve core (2) moves back and forth in the direction from the first opening to the second opening (11); The movable blocking valve core (2) comprises a column section for blocking the second opening (11) and a limiting boss radially protruding from the column section; a limiting step surface is provided on the inner wall of the valve cavity passage on the side of the second opening (11) close to the first opening; the limiting boss is used to abut against the limiting step surface and form the second limiting structure; and a through-type communication passage is axially provided on the movable blocking valve core (2) and is connected to the valve cavity passage; The automatic reset component also includes a connecting rod (3) whose first end is fixedly arranged with the movable blocking valve core (2) and whose second end is slidably connected with the fixed valve core (6); one end of the reset elastic member (8) is fixedly arranged with the second end of the connecting rod (3) and the other end is against the fixed valve core (6); the second end of the connecting rod (3) passes through the fixed valve core (6) and is located on the side of the fixed valve core (6) away from the movable blocking valve core (2); the reverse circulation acting member (9) is detachably connected to the second end of the connecting rod (3) and extends radially; a through passage for liquid to flow through is provided on the reverse circulation acting member (9); a connecting and fixing structure for connecting a pipeline is provided on the inner wall of the valve cavity passage between the fixed valve core (6) and the reverse circulation acting member (9); The reverse circulation acting member includes a plurality of blades distributed at intervals along the circumferential direction, and the interval space between each two adjacent blades forms the through passage.

2. An oil well sand flushing operation supporting component, characterized in that: The invention comprises the lifting short-circuit type automatic continuous forward and reverse circulation valve as claimed in claim 1, wherein the first opening and the third opening (7) are respectively arranged on the valve body (1) and are used to connect the two ends of the oil pipe.

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