A downhole safety valve that is easy to maintain

Abstract

The present invention relates to the field of valve-related technologies, and in particular to a downhole safety valve that is easy to maintain, including a pipe body, an upper joint, a lower joint, a center pipe, a hydraulic rod, a valve module, an auxiliary closing module, and a stabilizing module. The present invention adopts a method of first translating and then rotating the valve plate to open the valve plate, so that when the valve plate is closed, the valve plate is delayed in resetting, so that the end of the center pipe is scraped by a scraper to remove impurities attached to the end of the center pipe, so as to avoid impurities causing wear to the valve plate when the valve plate is closed, thereby increasing the service life of the valve plate. At the same time, the stabilizing module applies additional closing force to the valve plate, which assists the valve plate in closing quickly, while also ensuring that the force on the left and right sides of the valve plate is uniform, making it more stable and tight when closed, and ensuring the safe and reliable operation of the equipment under complex working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a downhole safety valve which is easy to maintain. Background Art

[0002] Downhole safety valve is a downhole tool installed in oil and gas wells. It can be closed urgently to prevent blowouts, ensure oil and gas well measures and production safety when fire occurs in production facilities, pipeline ruptures, or irresistible natural disasters (such as earthquakes, ice conditions, strong typhoons, etc.) occur. The general principle of ground-controlled downhole safety valve is: add hydraulic pressure from the ground, high-pressure liquid enters the piston chamber through the control pipeline, pushes the piston downward, compresses the spring, and pushes the valve plate to open; maintain the ground control pressure, that is, keep it open; release the ground control pressure, the valve plate resets under the action of the spring to close.

[0003] In the existing downhole safety valve, such as the Chinese patent with publication number CN220081390U, a downhole safety valve is disclosed, which includes a driving structure, a first housing, a second housing, a sealing member and a valve body assembly, wherein the first housing and the second housing are connected by threads. The valve body assembly is arranged in the second housing, and the sealing member is arranged above the valve body assembly. The sealing member includes a cover body and a seat body, and a blind hole is arranged on the seat body; a buffer structure is arranged in the blind hole, and the buffer structure includes a compression spring and a terminal, wherein one end of the compression spring contacts the bottom end of the blind hole, and the other end of the compression spring contacts the bottom surface of the terminal.

[0004] In the above-mentioned prior art, the maintenance cost is mainly reduced by splitting the seal and the valve body assembly into a separate design. However, the above-mentioned prior art does not take into account that petroleum is a very complex mixture, which usually contains various compounds, asphaltenes, colloids, metal elements, non-metallic elements and other substances. The extracted natural petroleum may also contain impurities such as ore gravel. Since the bottom of the center tube is in direct contact with the petroleum, gravel may be attached to the bottom of the center tube due to the viscosity of the petroleum. When the valve plate is subsequently closed, the pressure of the valve plate closing is relatively large (the underground oil field also applies pressure to the valve plate). The valve plate and the gravel squeeze and wear each other under pressure, which will cause the valve plate to wear too quickly. In addition, the valve plate is a one-way rotating opening and closing method, so there may be a situation where one side is unstable. At the same time, the underground pressure situation cannot be controlled, and the valve plate may be unevenly stressed.

[0005] Based on this, there is still room for improvement in the above-mentioned prior art. Summary of the invention

[0006] In order to make the valve plate more tightly closed and avoid interference from impurities, the present application provides a downhole safety valve that is easy to maintain.

[0007] The present application provides a downhole safety valve that is easy to maintain and adopts the following technical solution:

[0008] A downhole safety valve which is easy to maintain, characterized in that it comprises a pipe body, an upper joint, a lower joint, a center pipe, a hydraulic rod, a valve module, an auxiliary closing module and a stabilizing module. The upper joint is connected to the upper end of the pipe body by a thread, and the lower joint is connected to the lower end of the pipe body by a thread. The center pipe is arranged inside the pipe body for sliding up and down. A spring is connected between the center pipe and the pipe body, and the spring acts to reset. The hydraulic rod is arranged inside the pipe body, and the output end of the hydraulic rod is connected to the center pipe through an auxiliary part. The valve module is arranged inside the pipe body, and the valve module plays a role of sealing the bottom end of the center pipe. The auxiliary closing module is arranged in the pipe body, and the auxiliary closing module prevents impurities from obstructing the valve module and the center pipe. The stabilizing module is arranged on the right side inside the pipe body, and the stabilizing module makes the valve module more tightly sealed to the center pipe.

[0009] Preferably, an installation space is provided at the lower end of the tube body.

[0010] Preferably, the hydraulic rod is connected to a control console on the ground through a hydraulic pipeline, and personnel on the ground can input hydraulic oil into the hydraulic rod through the hydraulic pipeline, thereby extending the hydraulic rod and triggering the underground pipeline to be unblocked.

[0011] Preferably, the valve module includes a mounting block, a sliding groove, a matching groove, an air avoidance groove, a rotating base, a valve plate, an anti-rotation block, and an interception mechanism. The mounting block is mounted on the inner left side of the mounting space, sliding grooves are provided at the front and rear ends of the mounting block, a matching groove is provided at the right side of the mounting block, an air avoidance groove is provided at the lower end of the matching groove, the depth of the air avoidance groove is deeper than that of the matching groove, the rotating base is slidably arranged in the sliding groove, a spring two is connected between the rotating base and the sliding groove, and the spring two plays a reset role, the left end of the valve plate is rotatably arranged between the rotating base through a pin shaft, a spring three is connected between the valve plate and the rotating base, and the spring three plays a reset role, the anti-rotation block is mounted on the left end of the valve plate, the left end of the anti-rotation block is located in the matching groove, when the anti-rotation block is located in the matching groove and slides, the matching groove limits the anti-rotation block, thereby preventing the valve plate from rotating, and when the anti-rotation block moves to the air avoidance groove, the air avoidance groove no longer limits the anti-rotation block, at this time, the valve plate can rotate, and the interception mechanism is arranged in the mounting block.

[0012] Preferably, the intercepting mechanism includes an intercepting block, a linkage part, and an extrusion block. The intercepting block is slidably arranged in a hidden groove opened inside the mounting block. The intercepting block is an elastic and retractable structure. A chamfered structure which is conducive to extrusion is arranged on the upper end of the intercepting block. The linkage part is slidably arranged in the hidden groove. A spring four is connected between the linkage part and the hidden groove. The spring four plays a resetting role. The lower end of the linkage part is connected to the intercepting block. The extrusion block is installed on the side wall of the central tube. A chamfered structure is arranged on the upper end of the extrusion block. The extrusion block and the upper end of the linkage part are extrusion-matched. The extrusion block in the initial state squeezes the linkage part so that the linkage part is on the far left. At this time, the intercepting block moves with the linkage part, so that the intercepting block is not located in the matching groove, so that there is no obstacle in the matching groove.

[0013] Preferably, the auxiliary closing module includes a sliding bracket, a scraper member, and a reciprocating mechanism. The sliding bracket is symmetrically installed inside the installation space. The sliding bracket is an open box-shaped structure. The scraper member is slidably arranged between the sliding brackets, and the reciprocating mechanism is arranged on the sliding bracket.

[0014] Preferably, the reciprocating mechanism includes a chain, a gear, a rack, a driving member, and a driving pin. The chain is rotatably arranged inside the sliding bracket through the sprocket, and the gear is rotatably arranged on the right side of the sprocket through a one-way bearing. The one-way bearing in the prior art is a bearing that can rotate freely in one direction and is locked in another direction. The rack is slidably arranged inside the installation space, and a spring five is connected between the rack and the installation space. The spring five plays a reset role. The rack and the gear are meshed, and the lower end of the rack and the rotating base are extruded. The driving member is installed on the chain, and the driving member is an elastic and retractable structure. The driving member and the scraper member are intermittently extruded. One end of the driving pin is connected to the driving member, and the other end of the driving pin is slidably arranged in a guide groove opened on the side wall of the sliding bracket. The guide groove is composed of a straight groove and a V-shaped groove. When the driving pin moves from the straight groove to the upper bevel of the V-shaped groove, the driving pin moves in a direction close to the sliding bracket under the drive of the V-shaped groove, thereby causing the driving member to shrink, and the shrinking driving member no longer squeezes the scraper member.

[0015] Preferably, the stabilizing module includes a supporting member, a guide slot, a positioning slot, a card member, a sliding card plate, a trigger member, and a return mechanism. The supporting member is installed on the inner right side of the installation space, and a guide slot is provided on the right side of the supporting member. The card member is slidably arranged in the guide slot up and down, a spring six is ​​connected between the card member and the guide slot, and the spring six plays a reset role. The sliding card plate is slidably arranged at the lower end of the card member, and a spring seven is connected between the sliding card plate and the card member. The spring seven always has a tendency to push the sliding card plate to the right. The lower end of the guide slot is provided with a positioning slot for temporary locking cooperation with the sliding card plate, the trigger member is slidably arranged in the middle part of the card member, and a spring eight is connected between the trigger member and the card member. The spring eight plays a reset role. A chamfer is provided at the lower end of the trigger member, and the return mechanism is arranged inside the supporting member.

[0016] Preferably, the return mechanism comprises an extrusion block 1, a guide groove, a pin, an extrusion block 2, an extrusion block 3, and an extrusion block 4. The extrusion block 1 is slidably arranged in the installation groove opened inside the support member, a chamfered structure is arranged at the lower end of the left side of the extrusion block 1, a guide groove is opened at the side wall of the installation groove, a pin is installed on the side wall of the extrusion block 1, the pin is slidably arranged in the guide groove, a spring 8 is connected between the pin and the guide groove, and the spring 8 plays a reset role. The extrusion block 2 is slidably arranged in the installation groove left and right, and chamfered structures are arranged at both ends of the extrusion block 2. A spring 10 is connected between the extrusion block 2 and the installation groove, and the spring 10 plays a reset role. The extrusion block 2 is located on the right side of the extrusion block 1. The extrusion block 3 is slidably arranged in the installation groove up and down, and the extrusion block 3 and the extrusion block 2 are extrusion-matched. The extrusion block 4 is slidably arranged in the installation groove left and right, and a spring 11 is connected between the extrusion block 4 and the installation groove, and the spring 11 plays a reset role. The extrusion block 4 and the extrusion block 3 are extrusion-matched, and the left end of the extrusion block 4 is located in the positioning groove.

[0017] Preferably, the guide groove is a slide-like structure, and the guide groove consists of a vertical groove, a horizontal groove, and an inclined groove.

[0018] In summary, the beneficial technical effects of this application are as follows:

[0019] The present invention discloses a downhole safety valve which is easy to maintain. By first translating and then rotating the valve plate to open it, a delayed resetting of the valve plate is achieved when the valve plate is closed, so that the end of the center pipe is scraped by a scraper to remove impurities that may be attached to the end of the center pipe, thereby preventing the impurities from wearing the valve plate when the valve plate is closed. At the same time, the stabilizing module applies additional closing force to the valve plate, which assists the valve plate in closing quickly while ensuring that the left and right sides of the valve plate are evenly stressed, making it more stable and tight when closed, thereby ensuring the safe and reliable operation of the equipment under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a first three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the central tube, valve module, auxiliary closing module and stabilizing module of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the valve module of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the stabilizing module of the present invention;

[0025] Figure 6 It is a structural cross-sectional view of the central tube, valve module, auxiliary closing module and stabilizing module of the present invention;

[0026] Figure 7 is a structural cross-sectional view of a stabilizing module of the present invention;

[0027] Figure 8 The present invention Figure 7 A local enlarged view of point A;

[0028] Fig. 9 It is a schematic diagram of the structure between the guide groove and the pin member of the present invention;

[0029] Fig.10 It is a structural schematic diagram of the auxiliary closing module of the present invention;

[0030] Fig.11 It is a schematic diagram of the structure among the chain, driving member, driving pin, guide groove and scraper member of the present invention;

[0031] Fig.12 It is a structural schematic diagram of the guide groove of the present invention.

[0032] Description of reference numerals: 1, pipe body; 2, upper joint; 3, lower joint; 4, center pipe; 5, hydraulic rod; 6, valve module; 7, auxiliary closing module; 8, stabilizing module; 11, installation space; 61, installation block; 611, sliding groove; 612, matching groove; 613, air avoidance groove; 62, rotating base; 63, valve plate; 64, anti-rotation block; 65, interception mechanism; 651, interception block; 652, linkage member; 653, extrusion block; 71, sliding bracket; 71 1. Guide groove; 72. Scraper member; 73. Reciprocating mechanism; 731. Chain; 732. Gear; 733. Rack; 734. Driving member; 735. Driving pin; 81. Support member; 811. Guide groove; 812. Positioning groove; 82. Clamping member; 83. Sliding clamping plate; 84. Trigger member; 85. Return mechanism; 851. Extrusion block one; 852. Guide groove; 853. Pin member; 854. Extrusion block two; 855. Extrusion block three; 856. Extrusion block four. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-Figure 12 This application is described in further detail.

[0034] The embodiment of the present application discloses a downhole safety valve that is easy to maintain. By changing the closing method of the valve plate 63, the tightness of the valve plate 63 when closed is enhanced, and impurities are scraped off before closing to prevent impurities from causing wear to the valve plate 63.

[0035] Reference Figure 1 , Figure 2 , Figure 3 As shown, a downhole safety valve that is easy to maintain is characterized in that it includes a pipe body 1, an upper joint 2, a lower joint 3, a central pipe 4, a hydraulic rod 5, a valve module 6, an auxiliary closing module 7, and a stabilizing module 8. The upper joint 2 is connected to the upper end of the pipe body 1 by a thread, and the lower joint 3 is connected to the lower end of the pipe body 1 by a thread. The central pipe 4 is slidably arranged inside the pipe body 1 up and down, and a spring 1 is connected between the central pipe 4 and the pipe body 1, and the spring acts together to reset. The hydraulic rod 5 is arranged inside the pipe body 1, and the output end of the hydraulic rod 5 is connected to the central pipe 4 through an auxiliary part. The valve module 6 is arranged inside the pipe body 1, and the valve module 6 plays a role of sealing the bottom end of the central pipe 4. The auxiliary closing module 7 is arranged in the pipe body 1, and the auxiliary closing module 7 prevents impurities from obstructing between the valve module 6 and the central pipe 4. The stabilizing module 8 is arranged on the right side inside the pipe body 1, and the stabilizing module 8 makes the valve module 6 more tightly sealed to the central pipe 4.

[0036] When the downhole pipeline is arranged, the hydraulic rod 5 is extended to push the central pipe 4 downward. The downward central pipe 4 pushes the valve module 6 to move downward first and then rotate to open. When the downhole pressure is lost subsequently, the hydraulic rod 5 retracts and the central pipe 4 is reset under the action of spring 1. At this time, the valve module 6 is reset with delay. When the central pipe 4 is reset, the valve module 6 is triggered to reset subsequently. The auxiliary closing module 7 scrapes and cleans the end of the central pipe 4, thereby scraping off impurities, so that the valve module 6 and the end of the central pipe 4 are tightly fitted without impurities. At the same time, the stabilizing module 8 applies a closing force to the valve module 6 to make the closed state of the valve module 6 more secure. The present application achieves the effect of cleaning before closing by changing the valve closing method, so that the impurities contained in the petroleum will not be mixed between the valves when closing, thereby reducing wear and tear. At the same time, an additional force source is applied to the valve closure to stabilize it and ensure safety.

[0037] Reference Figure 2 As shown, a mounting space 11 is provided at the lower end of the tube body 1 .

[0038] Reference Figure 2 As shown, the hydraulic rod 5 is connected to the control console on the ground through a hydraulic pipeline. People on the ground can input hydraulic oil into the hydraulic rod 5 through the hydraulic pipeline, so that the hydraulic rod 5 extends and triggers the underground pipeline to be unblocked.

[0039] Reference Figure 3 As shown, in order to control the opening and closing of the pipe body 1, the present application is provided with a valve module 6, which includes a mounting block 61, a sliding groove 611, a matching groove 612, an air avoidance groove 613, a rotating base 62, a valve plate 63, an anti-rotation block 64, and an interception mechanism 65. The mounting block 61 is installed on the inner left side of the mounting space 11, and the front and rear ends of the mounting block 61 are provided with sliding grooves 611, the right side of the mounting block 61 is provided with a matching groove 612, and the lower end of the matching groove 612 is provided with an air avoidance groove 613, and the depth of the air avoidance groove 613 is deeper than that of the matching groove 612. The rotating base 62 is slidably set in the sliding groove 611, and the rotating base 62 and the sliding groove 611 are connected. Spring two, spring two plays a resetting role, the left end of the valve plate 63 is rotatably arranged between the rotating base 62 through the pin shaft, and a spring three is connected between the valve plate 63 and the rotating base 62, and the spring three is a torque spring, which plays a resetting role. The anti-rotation block 64 is installed at the left end of the valve plate 63, and the left end of the anti-rotation block 64 is located in the matching groove 612. When the anti-rotation block 64 slides in the matching groove 612, the matching groove 612 limits the anti-rotation block 64, thereby preventing the valve plate 63 from rotating. When the anti-rotation block 64 moves to the air avoidance groove 613, the air avoidance groove 613 no longer limits the anti-rotation block 64. At this time, the valve plate 63 can rotate, and the interception mechanism 65 is set in the mounting block 61.

[0040] In the actual opening and closing control process, the center tube 4 slides downward, and the center tube 4 squeezes the valve plate 63 to slide downward. At this time, since the anti-rotation block 64 is located in the matching groove 612, the valve plate 63 cannot rotate relative to the rotating base 62. The valve plate 63 moves vertically downward under the push, and the rotating base 62 is pushed down along with the valve plate 63. When the anti-rotation block 64 moves into the avoidance groove 613 (at the same time, the stabilizing module 8 is also triggered to unlock), at this time, the valve plate 63 can rotate, and the center tube 4 continues to slide downward to squeeze the valve plate 63. The valve plate 63 is relatively rotated relative to the rotating base 62 under the squeeze action. 2 rotates to realize rotational opening, and then the central tube 4 continues to move into the lower joint 3, thereby realizing the unblocking of the pipe body 1, the upper joint 2, the lower joint 3, and the central tube 4, so that the entire pipeline is in a working state, and can be used for the exploitation and transportation of oil, natural gas, etc., and when resetting later, the valve plate 63 rotates and resets under the action of the spring three, and then the rotating base 62 is vertically reset under the action of the spring two. During the resetting process, the interception mechanism 65 blocks the valve plate 63, so that the central tube 4 is reset first, and when the central tube 4 is reset, the valve plate 63 is triggered to achieve the rear reset.

[0041] Reference Figure 6 As shown, the interception mechanism 65 includes an interception block 651, a linkage member 652, and an extrusion block 653. The interception block 651 is slidably arranged in a hidden groove opened inside the mounting block 61. The interception block 651 is an elastic and retractable structure. The upper end of the interception block 651 is provided with a chamfered structure that is conducive to extrusion. The linkage member 652 is slidably arranged in the hidden groove. A spring four is connected between the linkage member 652 and the hidden groove. The spring four plays a reset role. The lower end of the linkage member 652 is connected to the interception block 651. The extrusion block 653 is installed on the side wall of the central tube 4. The upper end of the extrusion block 653 is provided with a chamfered structure. The extrusion block 653 and the upper end of the linkage member 652 are extrusion-matched. In the initial state, the extrusion block 653 squeezes the linkage member 652, so that the linkage member 652 is on the far left. At this time, the interception block 651 moves with the linkage member 652, so that the interception block 651 is not located in the matching groove 612, so that there is no obstacle in the matching groove 612.

[0042] In the actual delayed reset process, the extrusion block 653 moves downward with the center tube 4. After the movement, the extrusion block 653 no longer squeezes the linkage member 652. Under the action of spring four, the linkage member 652 moves to the right and is exposed in the matching groove 612. Then, the anti-rotation block 64 moving from top to bottom squeezes the interception block 651 from above. Since the upper end of the interception block 651 is provided with a chamfered structure, the anti-rotation block 64 squeezes the interception block 651 so that the interception block 651 contracts, thereby smoothly crossing the interception block 651. When the subsequent center tube 4 rises and resets, the rotating base 62 rises and resets under the action of spring two, the valve plate 63 rises and resets, and the anti-rotation block 64 rises and resets with the valve plate 63, but at this time the anti-rotation block 64 moves from bottom to top. When the anti-rotation block 64 contacts the interception block 651 (the anti-rotation block 64 contacts the lower end surface of the interception block 651), the interception block 651 cannot be squeezed and contracted. Therefore, the interception block 651 limits the anti-rotation block 64 moving from bottom to top, thereby realizing the chronological reset relationship between the center tube 4 and the valve plate 63. When the center tube 4 is reset, the extrusion block 653 squeezes the linkage member 652 again, and the linkage member 652 is squeezed and moved to the far left. The interception block 651 moves with the linkage member 652, so that the interception block 651 is not located in the matching groove 612, and the interception block 651 no longer limits the anti-rotation block 64, so that the rotating base 62 continues to rise and reset under the action of spring 2, thereby realizing the reset of the valve plate 63.

[0043] Reference Fig.10 As shown, petroleum is a very complex mixture, usually containing various compounds, asphaltene, colloid, metal elements, non-metallic elements and other substances. The extracted natural petroleum may also contain impurities such as ore gravel. Since the bottom of the central tube 4 is in direct contact with the petroleum, gravel may be attached to the bottom of the central tube 4 due to the viscosity of the petroleum. When the valve plate 63 is closed subsequently, the pressure of closing the valve plate 63 is relatively large (the underground oil field will also apply pressure to the valve plate 63). The valve plate 63 and the gravel squeeze and wear each other under pressure, which will cause the valve plate 63 to wear too quickly. In order to delay the wear of the valve plate 63, the present application is provided with an auxiliary closing module 7, and the auxiliary closing module 7 includes a sliding bracket 71, a scraper member 72, and a reciprocating mechanism 73. The sliding bracket 71 is symmetrically installed inside the installation space 11. The sliding bracket 71 is an open box-shaped structure. The scraper member 72 is set between the sliding bracket 71 for sliding back and forth, and the reciprocating mechanism 73 is set on the sliding bracket 71.

[0044] Reference Figure 10-12As shown, the reciprocating mechanism 73 includes a chain 731, a gear 732, a rack 733, a driving member 734, and a driving pin 735. The chain 731 is rotatably arranged inside the sliding bracket 71 through a sprocket. The gear 732 is rotatably arranged on the right side of the sprocket through a one-way bearing. The one-way bearing in the prior art is a bearing that can rotate freely in one direction and is locked in another direction. The rack 733 is slidably arranged inside the installation space 11 up and down. A spring five is connected between the rack 733 and the installation space 11. The spring five plays a reset role. The rack 733 is meshed with the gear 732. The lower end of the rack 733 and the rotating base 62 are Extrusion fit, the driving member 734 is installed on the chain 731, the driving member 734 is an elastic and retractable structure, the driving member 734 and the scraper member 72 are intermittently extruded, one end of the driving pin 735 is connected to the driving member 734, and the other end of the driving pin 735 is slidably set in the guide groove 711 opened on the side wall of the sliding bracket 71, and the guide groove 711 is composed of a straight groove and a V-shaped groove. When the driving pin 735 moves from the straight groove to the upper bevel of the V-shaped groove, the driving pin 735 moves in the direction close to the sliding bracket 71 under the drive of the V-shaped groove, thereby causing the driving member 734 to shrink, and the shrinking driving member 734 no longer squeezes the scraper member 72.

[0045] In the actual process of scraping impurities, when the central pipe 4 is reset and the valve plate 63 is triggered to reset, during the process of the valve plate 63 being reset, the rotating base 62 pushes the rack 733 to move upward during the upward movement, and under the meshing action, the gear 732 rotates, and the rotating gear 732 drives the sprocket to rotate, and the chain 731 rotates with the rotation of the sprocket, so that the driving member 734 approaches the scraper member 72 and squeezes the scraper member 72 to move from front to back, and the scraper member 72 moving from front to back scrapes the bottom end surface of the reset central pipe 4, preventing the bottom end surface of the central pipe 4 from being reset during long-term mining and transportation. During the conveying process, some impurities adhere to the bottom end surface of the central tube 4 due to viscosity, causing the valve plate 63 to contact with the impurities and excessive wear. After the scraper member 72 scrapes the bottom end surface of the central tube 4, the scraper member 72 continues to move, causing the driving pin 735 to move from the straight groove to the upper bevel of the V-shaped groove. The driving pin 735 moves in the direction close to the sliding bracket 71 under the drive of the V-shaped groove, thereby causing the driving member 734 to shrink. The shrinking driving member 734 no longer squeezes the scraper member 72, so that the scraper member 72 stays at this position and remains stable. After the contracted driving member 734 passes over the scraper member 72, the driving pin 735 passes from the upper bevel of the V-shaped groove through the lower bevel of the V-shaped groove and enters the straight groove again, so that the driving member 734 is extended and reset (the chain 731 moves half a circle at this time). When the subsequent valve plate 63 is opened again, the rotating base 62 moves downward and no longer squeezes the rack 733. The rack 733 moves downward under the action of the spring 5. Under the meshing action, the gear 732 rotates, but under the action of the one-way bearing, the gear 732 is idle and the sprocket does not rotate, so that the scraper Component 72 remains stationary. Only when the valve plate 63 is closed again, the gear 732 drives the sprocket to rotate again, and the chain 731 rotates half a coupon again. At this time, the driving component 734 continues to follow the chain 731 to rotate to the rear of the scraper component 72. After that, the driving component 734, driven by the chain 731, pushes the scraper component 72 from back to front to scrape the bottom end surface of the center tube 4. Then the driving component 734 returns to its initial position, so that during the process of the chain 731 rotating one circle, the scraper component 72 reciprocates back and forth once, thereby scraping off impurities.

[0046] Reference Figure 5-Figure 7As shown, the valve plate 63 is a one-way rotating opening and closing method, so there may be a situation where one side is not closed stably, and the underground pressure situation cannot be controlled, and the valve plate 63 may be unevenly stressed. In order to ensure that the valve plate 63 is closed stably, the present application is provided with a stabilizing module 8, and the stabilizing module 8 includes a supporting member 81, a guide groove 811, a clamping groove 812, a clamping member 82, a sliding clamping plate 83, a trigger member 84, and a return mechanism 85. The supporting member 81 is installed on the right side of the installation space 11, and a guide groove 811 is provided on the right side of the supporting member 81. The clamping member 82 is slidably arranged in the guide groove 811 up and down, and the clamping member 8 A spring 6 is connected between 2 and the guide slot 811, and the spring 6 plays a reset role. The sliding card plate 83 is slidably arranged at the lower end of the card member 82, and a spring 7 is connected between the sliding card plate 83 and the card member 82. The spring 7 always pushes the sliding card plate 83 to the right. A clamping groove 812 is provided at the lower end of the guide slot 811 for temporarily clamping with the sliding card plate 83. The trigger member 84 is slidably arranged at the middle part of the card member 82, and a spring 8 is connected between the trigger member 84 and the card member 82. The spring 8 plays a reset role. The lower end of the trigger member 84 is provided with a chamfer, and the return mechanism 85 is arranged inside the support member 81.

[0047] In the actual stabilization process, the clamping member 82 and the sliding clamping plate 83 cooperate to clamp the right side of the valve plate 63. When the valve plate 63 is pushed downward, the valve plate 63 squeezes the sliding clamping plate 83, so that the clamping member 82 and the sliding clamping plate 83 slide downward along the guide groove 811 together. At this time, the guide groove 811 restricts the tendency of the sliding clamping plate 83 to move to the right. When the sliding clamping plate 83 moves to the position corresponding to the clamping groove 812, under the action of the spring 7, the sliding clamping plate 83 moves to the right to The locking groove 812 is used to lock the position of the locking member 82, thereby preventing the locking member 82 from being reset in advance. Afterwards, when the valve plate 63 is closed, the valve plate 63 triggers the return mechanism 85 to reset the sliding clamp 83, and the clamp 82 and the sliding clamp 83 clamp the valve plate 63 again and assist in resetting it.

[0048] Reference Figure 8 , Fig. 9As shown, the present application is provided with a return mechanism 85 to reset the sliding card plate 83, and the return mechanism 85 includes an extrusion block 1 851, a guide groove 852, a pin 853, an extrusion block 2 854, an extrusion block 3 855, and an extrusion block 4 856. The extrusion block 1 851 is slidably arranged in the installation groove opened inside the support member 81, and a chamfered structure is arranged at the lower left end of the extrusion block 1 851. The side wall of the installation groove is provided with a guide groove 852, and a pin 853 is installed on the side wall of the extrusion block 1 851. The pin 853 is slidably arranged in the guide groove 852. A spring 8 is connected between the pin 853 and the guide groove 852, and the spring 8 plays a resetting role. The second extrusion block 854 is set in the installation groove for sliding left and right, and the left and right ends of the extrusion block 854 are provided with chamfered structures. A spring ten is connected between the extrusion block 854 and the installation groove, and the spring ten plays a reset role. The extrusion block 854 is located on the right side of the extrusion block 1 851. The extrusion block 3 855 is set in the installation groove for sliding up and down, and the extrusion block 3 855 and the extrusion block 2 854 are extrusion-fitted. The extrusion block 4 856 is set in the installation groove for sliding left and right, and a spring eleven is connected between the extrusion block 4 856 and the installation groove, and the spring eleven plays a reset role. The extrusion block 4 856 and the extrusion block 3 855 are extrusion-fitted, and the left end of the extrusion block 4 856 is located in the positioning groove 812.

[0049] Reference Fig. 9 As shown, the guide groove 852 is a slide-like structure, and the guide groove 852 consists of a vertical groove, a horizontal groove, and an inclined groove.

[0050] In actual operation, the sliding card plate 83 contacts and squeezes the extrusion block 851 during the downward sliding process. The extrusion block 851 is squeezed and moves downward, and the pin member 853 moves downward with the extrusion block 851. The pin member 853 moving downward gradually moves from the vertical slot (the vertical slot is shorter, and the purpose of moving this distance is to make sure that there is no overlap between the extrusion block 851 and the extrusion block 854, thereby facilitating the movement of the extrusion block 851) to the inclined slot. The pin member 853, the vertical slot, and the inclined slot cooperate to force the extrusion block 851 to move to the lower right, from Without causing any obstruction to the sliding card plate 83, thereafter, when the sliding card plate 83 moves to the card slot 812, the position of the trigger member 84 corresponds to the extrusion block 1 851, and when the valve plate 63 rotates to open, the valve plate 63 no longer squeezes the trigger member 84, and the trigger member 84 moves to the left under the action of the spring 8. After the movement, the trigger member 84 no longer squeezes the extrusion block 1 851, and under the action of the spring 8, the extrusion block 1 851 is reset (because the trigger member 84 moves to the left to leave space, the card member 82 is inserted after the extrusion block 1 851 is reset), and thereafter, when the valve plate 63 rotates to close, , the valve plate 63 squeezes the trigger member 84, the squeezed trigger member 84 squeezes the squeezing block 1 851, the squeezing block 1 851 squeezes the squeezing block 2 854, the pin member 853 slides in the horizontal groove, and the squeezing block 2 854 is squeezed to the right (because there is a plane overlap between the squeezing block 1 851 and the squeezing block 2 854, and the force exerted on the squeezing block 1 851 at this time is horizontal to the right, so the squeezing block 1 851 can smoothly squeeze the squeezing block 2 854 to move to the right), the squeezing block 2 854 moving to the right squeezes the squeezing block 3 855, and the squeezing block 3 855 squeezes and squeezes Block four 856, the extrusion block four 856 is squeezed to move to the left, and the extrusion block four 856 moving to the left squeezes the sliding card plate 83 to move to the left and reset, the sliding card plate 83 disengages from the locking groove 812, the position of the clamping member 82 is unlocked, and the sliding card plate 83 and the clamping member 82 clamp and lock the valve plate 63 again, and under the action of spring six, the clamping member 82 drives the valve plate 63 to reset (right side), and at the same time, under the action of spring two, the rotating base 62 drives the valve plate 63 to reset (left side), thereby realizing double pressure locking of the closed valve plate 63, making its force more uniform.

[0051] The implementation principle of this embodiment is:

[0052] Step 1: After confirming that the downhole pipeline is arranged, pressurize the hydraulic rod 5;

[0053] Step 2: The hydraulic rod 5 extends to push the central tube 4 downward, and the downward central tube 4 pushes the valve plate 63 to move downward first, and then rotate to open;

[0054] Step 3: When the underground pressure is lost or the pipeline needs to be closed, the hydraulic rod 5 retracts, the central tube 4 is reset under the action of the spring 1, and the valve plate 63 is temporarily stopped under the action of the interception mechanism 65;

[0055] Step 4: When the central tube 4 completes the reset, the valve plate 63 triggers the delayed reset;

[0056] Step 5: During the delayed resetting of the valve plate 63, the auxiliary closing module 7 is triggered to clean the end of the central tube 4, and at the same time, the stabilizing module 8 applies a closing force to the right side of the valve plate 63, so that the closing state of the valve plate 63 is more reliable and the force on the left and right sides is more uniform;

[0057] Step 6: Closing is complete.

[0058] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A downhole safety valve that is easy to maintain, characterized in that: include: tube body(1); An upper joint (2) which is connected to the upper end of the pipe body (1) by means of threads; A lower joint (3) which is connected to the lower end of the pipe body (1) by means of threads; A central tube (4) is slidably disposed inside the tube body (1) up and down, and a spring 1 is connected between the central tube (4) and the tube body (1); A hydraulic rod (5) is arranged inside the pipe body (1), and an output end of the hydraulic rod (5) is connected to the central pipe (4) through an auxiliary component; A valve module (6) is arranged inside the pipe body (1), and the valve module (6) plays a role of sealing the bottom end of the central pipe (4); An auxiliary closing module (7) is arranged in the pipe body (1), and the auxiliary closing module (7) prevents impurities from being blocked between the valve module (6) and the central pipe (4); A stabilizing module (8) is arranged on the right side of the interior of the pipe body (1), and the stabilizing module (8) makes the sealing effect of the valve module (6) on the central pipe (4) tighter; The valve module (6) comprises: a mounting block (61) which is mounted on the left side of the mounting space (11); a sliding groove (611) is provided at the front and rear ends of the mounting block (61); a matching groove (612) is provided at the right side of the mounting block (61); a clearance groove (613) is provided at the lower end of the matching groove (612); the depth of the clearance groove (613) is deeper than that of the matching groove (612); A rotating base (62) is slidably disposed in the sliding groove (611), and a second spring is connected between the rotating base (62) and the sliding groove (611); The valve plate (63) has a left end which is rotatably arranged between the rotating base (62) via a pin shaft, and a spring 3 is connected between the valve plate (63) and the rotating base (62); An anti-rotation block (64) is mounted on the left end of the valve plate (63), and the left end of the anti-rotation block (64) is located in the matching groove (612); An interception mechanism (65) disposed in the mounting block (61); The interception mechanism (65) comprises: an interception block (651) which is slidably arranged in a hidden groove provided inside the mounting block (61) to the left and right, the interception block (651) being an elastic and retractable structure, and the upper end of the interception block (651) being provided with a chamfered structure which is conducive to extrusion; A linkage member (652) is slidably disposed in the hidden groove, a spring (4) is connected between the linkage member (652) and the hidden groove, and a lower end of the linkage member (652) is connected to the interception block (651); An extrusion block (653) is mounted on the side wall of the central tube (4); the upper end of the extrusion block (653) is provided with a chamfered structure; the extrusion block (653) and the upper end of the linkage member (652) are extrusion-fitted; The auxiliary closing module (7) comprises: A sliding bracket (71) is installed symmetrically inside the installation space (11), and the sliding bracket (71) is an open box-shaped structure; A scraper member (72) is slidably disposed between the sliding brackets (71) in a forward and backward manner; A reciprocating mechanism (73) disposed on the sliding bracket (71); The reciprocating mechanism (73) comprises: A chain (731) is rotatably arranged inside the sliding bracket (71) via a sprocket; A gear (732) is rotatably arranged on the right side of the sprocket through a one-way bearing; A rack (733) is slidably disposed inside the installation space (11) up and down, a spring five is connected between the rack (733) and the installation space (11), the rack (733) is meshed with the gear (732), and the lower end of the rack (733) is extruded and fitted with the rotating base (62); A driving member (734) is installed on the chain (731), the driving member (734) is an elastic and retractable structure, and the driving member (734) and the scraper member (72) are intermittently squeezed together; One end of the driving pin (735) is connected to the driving member (734), and the other end of the driving pin (735) is slidably disposed in a guide groove (711) provided on the side wall of the sliding bracket (71).

2. A downhole safety valve that is easy to maintain according to claim 1, characterized in that: The lower end of the tube body (1) is provided with an installation space (11).

3. A downhole safety valve that is easy to maintain according to claim 1, characterized in that: The hydraulic rod (5) is connected to a control console on the ground via a hydraulic pipeline.

4. A downhole safety valve that is easy to maintain according to claim 2, characterized in that: The stabilizing module (8) comprises: A support member (81) is installed on the right side of the installation space (11), and a guide groove (811) is provided on the right side of the support member (81); A clamping member (82) is slidably disposed in the guide slide groove (811) up and down, and a spring 6 is connected between the clamping member (82) and the guide slide groove (811); A sliding card plate (83) is slidably arranged at the lower end of the card member (82) so as to slide left and right. A spring 7 is connected between the sliding card plate (83) and the card member (82). A card slot (812) for temporarily engaging with the sliding card plate (83) is provided at the lower end of the guide groove (811). A trigger member (84) is slidably disposed in the middle of the clamping member (82) so as to slide left and right. A spring 8 is connected between the trigger member (84) and the clamping member (82). The lower end of the trigger member (84) is chamfered. The return mechanism (85) is arranged inside the support (81).

5. A downhole safety valve that is easy to maintain according to claim 4, characterized in that: The return mechanism (85) comprises: An extrusion block (851) is slidably disposed in a mounting groove provided inside the support member (81) to the left and right, a chamfered structure is disposed at the lower left end of the extrusion block (851), a guide groove (852) is provided on the side wall of the mounting groove, a pin member (853) is installed on the side wall of the extrusion block (851), the pin member (853) is slidably disposed in the guide groove (852), and a spring (8) is connected between the pin member (853) and the guide groove (852); Extrusion block 2 (854) is slidably arranged in the installation slot, and both left and right ends of the extrusion block 2 (854) are provided with chamfered structures. A spring 9 is connected between the extrusion block 2 (854) and the installation slot. The extrusion block 2 (854) is located to the right of the extrusion block 1 (851); The extrusion block three (855) is slidably arranged in the installation groove, and the extrusion block three (855) and the extrusion block two (854) are extrusion-fitted; The extrusion block four (856) is slidably arranged in the installation slot, a spring eleven is connected between the extrusion block four (856) and the installation slot, the extrusion block four (856) and the extrusion block three (855) are extrusion-fitted, and the left end of the extrusion block four (856) is located in the locking slot (812).

6. A downhole safety valve that is easy to maintain according to claim 5, characterized in that: The guide groove (852) is a slide-like structure, and the guide groove (852) consists of a vertical groove, a horizontal groove, and an inclined groove.

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