A percutaneous self-expanding stent-supported occlusion system

Abstract

The present application relates to the technical field of drilling, and discloses a drilling intervention type self-expanding stent supporting and plugging system, which comprises a shell assembly, a valve body assembly is slidably arranged in the shell assembly along the length direction, a spiral groove turntable is rotatably arranged in the shell assembly, a drainage channel is defined in the spiral groove turntable, and a plugging stent capsule is stored in the drainage channel, a floating piston sleeve is slidably arranged in the shell assembly along the length direction of the shell assembly and is screw-connected with the spiral groove turntable, a reset spring is arranged between the floating piston sleeve and the spiral groove turntable, a fixed stopper is connected with the floating piston sleeve and the valve body assembly, the spiral groove turntable can be driven to rotate by mud, the drainage channel is connected with a bypass hole and a liquid outlet, and the plugging stent capsule is ejected, the plugging stent capsule can be dissolved and deformed to actively construct a stable physical skeleton in the well after being ejected, the size of the drilling bit water hole is not limited, a large amount of traditional plugging material does not need to be put into from the surface, and the plugging effect in the well is good.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and in particular to a drilling-interventional self-expanding support and plugging system. Background Technology

[0002] Conventional screw drill bypass valves only have simple on / off and flow diversion functions, and cannot perform cementing or large particle plugging operations without drilling. This leads to serious well leakage and the need for frequent tripping up and down of the drill string to replace the drill string, resulting in extended operation cycles.

[0003] Bypass valves typically employ a ball-drop type, which requires multiple activation. However, existing ball-drop type bypass valves face engineering bottlenecks in deep wells, highly deviated wells, and horizontal wells, including long ball drop times, limited basket capacity, and even ball failure. Furthermore, due to limitations in drill bit orifice size, the millimeter-sized plugging particles pumped in are extremely ineffective at sealing large cracks and fracture-related leaks. Conventional "bridge" plugging methods rely on the random accumulation of particles in the hydraulic environment, which are easily washed away by high-speed fluids within irregular cracks, lacking an active and reliable physical anchoring structure.

[0004] In view of this, how to provide a downhole system that can intervene while drilling and actively construct a stable physical framework is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling-interventional self-expanding stent support and plugging system to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides a drilling-interventional self-expanding stent support and plugging system, comprising: The housing assembly has a valve body assembly that slides along its length inside it; A spiral groove turntable is rotatably disposed within the housing assembly, and a drainage channel is defined within the spiral groove turntable, wherein a leak-sealing support capsule is stored within the drainage channel; A floating piston sleeve is slidably disposed within the housing assembly along the length of the housing assembly and is helically connected to the helical groove turntable. A return spring is provided between the floating piston sleeve and the helical groove turntable. A fixed stop is connected to the floating piston sleeve and to the valve body assembly; The valve body assembly has a bypass hole, and the outer shell assembly has a liquid storage port. When mud is introduced into the outer shell assembly, the valve body assembly closes, the fixed stop, the floating piston sleeve and the valve body assembly move along the length of the outer shell assembly, the spiral groove turntable rotates to a preset position, the drainage channel connects the bypass hole and the liquid outlet and ejects the plugging bracket capsule; when the mud pressure is greater than the preset pressure, the valve body assembly opens, and the return spring resets the fixed stop, the floating piston sleeve and the valve body assembly.

[0007] Furthermore, the housing assembly includes a lower housing and an upper housing, with the liquid outlet located on the upper housing.

[0008] Furthermore, the valve body assembly includes: The lower valve seat has a keyway in the lower outer shell, and the lower valve seat is connected to the keyway in the lower outer shell via a lower valve seat key. The upper valve seat is connected to the lower valve seat by a threaded connection and / or a snap-fit ​​connection, and the upper valve seat is connected to the keyway of the lower housing by an upper valve seat key. The valve body is disposed between the upper valve seat and the lower valve seat; The soluble plastic ball is inserted into the valve body from one end of the upper valve seat. When the mud pressure is less than or equal to the preset pressure, the soluble plastic ball closes the valve body. When the mud pressure is greater than the preset pressure, the soluble plastic ball dissolves, the valve body opens, and the mud can pass through the upper valve seat, the valve body, and the lower valve seat in sequence and flow out from the end of the lower outer shell.

[0009] Furthermore, the upper valve seat is provided with an upper valve seat circumferential groove, and the lower valve seat defines a lower valve seat buckle. The lower valve seat buckle can be inserted into the upper valve seat along the upper valve seat circumferential groove. After twisting the upper valve seat and the lower valve seat, the lower valve seat buckle engages with the upper valve seat circumferential groove, and the upper valve seat key is aligned with the lower valve seat key.

[0010] Furthermore, a spiral groove is provided at one end of the spiral groove turntable corresponding to the floating piston sleeve, and the floating piston sleeve is connected to the spiral groove turntable through a stop pin.

[0011] Furthermore, the spiral groove is a wavy spiral groove, and the spiral groove turntable has multiple positioning grooves along the circumference. The positioning grooves are arranged at intervals with the spiral groove, and the upper outer shell has spring pins corresponding to the positioning grooves. The spring pins are connected to the positioning grooves to limit the rotation of the spiral groove turntable.

[0012] Furthermore, a floating piston sleeve key is provided on the outer side of the floating sleeve piston, and a first keyway is provided on the inner wall of the upper outer shell along the length direction. The floating piston sleeve key is connected to the first keyway. A fixed stop key is provided on the outer side of the fixed stop block, and a second keyway is provided on the inner wall of the upper outer shell along the length direction. The fixed stop key is connected to the second keyway. The first keyway and the second keyway are staggered.

[0013] Furthermore, the leak-sealing stent capsule includes: Upper section of soluble coating; The lower section of the soluble coating is connected to the upper section of the soluble coating, forming a hollow capsule-shaped structure; both the upper and lower sections of the soluble coating are made of PGA material. The initial state plugging support, located inside the capsule-shaped structure, is made of nickel-titanium shape memory alloy. When the plugging support capsule is ejected from the outlet by mud, the upper and lower sections of the soluble coating are catalyzed by the downhole ambient temperature and dissolved by the mud. The austenite temperature of the initial state plugging support is lower than the downhole ambient temperature, deforming into an activated state plugging support and sealing the downhole fracture.

[0014] Furthermore, the upper valve seat and the lower valve seat are connected by a first connecting thread, and the floating piston sleeve is connected to the fixed stop block by a second connecting thread.

[0015] Furthermore, a valve body sealing ring is provided on the outer side of the valve body, a spiral groove rotating disc sealing ring is provided between the spiral groove rotating disc and the upper valve seat, a fixed block inner sealing ring is provided between the fixed block and the upper valve seat, and a fixed block outer sealing ring is provided between the fixed block and the upper outer shell.

[0016] The present invention discloses the following technical effects: 1. This invention provides a downhole plugging structure that can be used to drive a spiral groove rotary table to rotate using mud, thereby connecting the bypass hole and the fluid outlet through the drainage channel and ejecting the plugging support capsule. After ejection, the plugging support capsule can dissolve, deform, and actively construct a stable physical framework downhole. Compared with the prior art, it is not limited by the size of the drill bit water hole, does not require the injection of a large amount of traditional plugging materials from the surface, and has a good downhole plugging effect.

[0017] 2. This invention controls the dissolution of soluble plastic balls by controlling mud pressure, thereby controlling the opening and closing of the valve body. The spiral groove turntable can also be reused repeatedly. Compared with existing technologies, it enables equipment reuse and facilitates downhole plugging operations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic cross-sectional view of the device in its initial state. Figure 2 A schematic cross-sectional view showing the connection between the drainage channel, the bypass hole, and the liquid outlet. Figure 3 This is a schematic diagram of the isometric cross-section of the device in its initial state. Figure 4 An isometric cross-sectional view of the state of the drainage channel connecting the bypass hole and the liquid outlet; Figure 5 This is an assembly diagram of the spiral groove turntable, floating piston sleeve, and valve body assembly. Figure 6 This is a schematic cross-sectional view of the spiral groove turntable of the present invention; Figure 7 This is a schematic diagram of the spiral groove turntable of the present invention; Figure 8 This is a schematic diagram showing the connection between the upper and lower valve seats; Figure 9 This is a schematic cross-sectional view of the connection between the upper and lower valve seats. Figure 10 Schematic diagram of the plugging support in the activated state; Figure 11 This is a schematic diagram of the initial state of the leak-sealing support; The components include: 1. Upper valve seat; 2. Spiral groove turntable; 3. Floating piston sleeve; 4. Stop pin; 5. Valve body; 6. Return spring; 7. Lower valve seat; 8. Lower outer shell; 9. Upper outer shell; 10. Fixed stop block; 11. Valve body sealing ring; 12. Spiral groove turntable sealing ring; 13. Inner sealing ring of fixed stop block; 14. Outer sealing ring of fixed stop block; 15. Soluble plastic ball; 16. Liquid outlet; 17. Drainage channel; 18. First connecting thread; 19. Keyway of lower outer shell; 0. Bypass hole; 21. Lower valve seat key; 22. Spring pin; 23. Positioning groove; 24. Spiral groove; 25. Upper section of soluble coating; 26. Activated state leak-stopping bracket; 27. Initial state leak-stopping bracket; 28. Lower section of soluble coating; 29. ​​Floating piston sleeve key; 30. First keyway; 31. Upper valve seat key; 32. Fixed stop key; 33. Second keyway; 34. Lower valve seat snap; 35. Upper valve seat circumferential groove; 36. Second connecting thread. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Those skilled in the art will understand that the term "comprising" as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 11 As shown, this embodiment of the invention provides a drilling-interventional self-expanding stent-supported plugging system, comprising: The housing assembly has a valve body 5 component that is slidably disposed inside along its length. The spiral groove turntable 2 is rotatably disposed within the housing assembly. The spiral groove turntable 2 defines a drainage channel 17, and the drainage channel 17 stores a leak-stopping bracket capsule. The floating piston sleeve 3 is slidably disposed inside the housing assembly along the length of the housing assembly and is helically connected to the spiral groove turntable 2. A return spring 6 is provided between the floating piston sleeve 3 and the spiral groove turntable 2. The fixed stop 10 is connected to the floating piston sleeve 3 and to the valve body 5 assembly; The valve body 5 assembly has a bypass hole 20, and the outer shell assembly has a liquid storage port. When mud is introduced into the outer shell assembly, the valve body 5 assembly closes, the fixed stop 10, the floating piston sleeve 3 and the valve body 5 assembly move along the length of the outer shell assembly, the spiral groove turntable 2 rotates to the preset position, the drainage channel 17 connects the bypass hole 20 and the liquid outlet 16 and pops out the plugging bracket capsule; when the mud pressure is greater than the preset pressure, the valve body 5 assembly opens, and the reset spring 6 resets the fixed stop 10, the floating piston sleeve 3 and the valve body 5 assembly.

[0024] In this embodiment, multiple drainage channels 17 are provided and arranged circumferentially along the spiral groove turntable 2, and the included angle between adjacent drainage channels 17 is 60°.

[0025] In this embodiment, the outer casing assembly includes a lower outer casing 8 and an upper outer casing 9, with the liquid outlet 16 located on the upper outer casing 9.

[0026] In this embodiment, the valve body 5 assembly includes: The lower valve seat 7 and the lower outer shell 8 are provided with a lower outer shell keyway 19. The lower valve seat 7 is connected to the lower outer shell keyway 19 through the lower valve seat flat key 21. The upper valve seat 1 is connected to the lower valve seat 7 by a threaded connection and / or a snap-fit ​​connection. The upper valve seat 1 is connected to the lower housing keyway 19 by the upper valve seat key 31. Valve body 5 is disposed between upper valve seat 1 and lower valve seat 7; The soluble plastic ball 15 extends from one end of the upper valve seat 1 toward the fixed stop 10 and communicates with the outside. The soluble plastic ball 15 can be inserted into the valve body 5 from one end of the upper valve seat 1. When the mud pressure is less than or equal to the preset pressure, the soluble plastic ball 15 closes the valve body 5. When the mud pressure is greater than the preset pressure, the soluble plastic ball 15 dissolves, the valve body 5 opens, and the mud can pass through the upper valve seat 1, the valve body 5 and the lower valve seat 7 in sequence and flow out from the end of the lower outer shell 8.

[0027] In this embodiment, the upper valve seat 1 is provided with an upper valve seat circumferential groove 35, and the lower valve seat 7 defines a lower valve seat buckle 34. The lower valve seat buckle 34 can be inserted into the upper valve seat 1 along the upper valve seat circumferential groove 35. After twisting the upper valve seat 1 and the lower valve seat 7, the lower valve seat buckle 34 engages with the upper valve seat circumferential groove 35, and the upper valve seat key 31 is aligned with the lower valve seat key 21.

[0028] In this embodiment, a spiral groove 24 is provided at one end of the spiral groove turntable 2 corresponding to the floating piston sleeve 3, and the floating piston sleeve 3 is connected to the spiral groove turntable 2 through a stop pin 4.

[0029] In this embodiment, the spiral groove 24 is a wave-shaped spiral groove 24. The spiral groove turntable 2 has multiple positioning grooves 23 along the circumference. The positioning grooves 23 and the spiral groove 24 are arranged at intervals. The upper outer shell 9 has spring pins 22 corresponding to the positioning grooves 23. The spring pins 22 are connected to the positioning grooves 23 to limit the rotation of the spiral groove turntable 2.

[0030] In this embodiment, a floating piston sleeve key 29 is provided on the outer side of the floating sleeve piston, and a first keyway 30 is provided on the inner sidewall of the upper outer shell 9 along the length direction. The floating piston sleeve key 29 and the first keyway 30 are connected in a cooperative manner. A fixed stop key 32 is provided on the outer side of the fixed stop block 10, and a second keyway 33 is provided on the inner sidewall of the upper outer shell 9 along the length direction. The fixed stop key 32 and the second keyway 33 are connected in a cooperative manner. The first keyway 30 and the second keyway 33 are staggered by an angle of 90°.

[0031] In this embodiment, the leak-sealing stent capsule includes: Upper section of soluble coating 25; The lower section 28 of the soluble coating is connected to the upper section 25 of the soluble coating, forming a hollow capsule-shaped structure; both the upper section 25 and the lower section 28 of the soluble coating are made of PGA material. The initial state plugging support 27 is set inside the capsule-shaped structure and is made of nickel-titanium shape memory alloy. When the plugging support capsule is ejected from the outlet 16 by the mud, the upper section 25 and the lower section 28 of the soluble coating are catalyzed by the downhole ambient temperature and dissolved by the mud. The austenite temperature of the initial state plugging support 27 is lower than the downhole ambient temperature, and it deforms into the activated state plugging support 26 and seals the downhole fracture.

[0032] In this embodiment, the upper valve seat 1 and the lower valve seat 7 are connected by a first connecting thread 18, and the floating piston sleeve 3 and the fixed stop block 10 are connected by a second connecting thread 36.

[0033] In this embodiment, a valve body sealing ring 11 is provided on the outside of the valve body 5, a spiral groove rotating disk sealing ring 12 is provided between the spiral groove rotating disk 2 and the upper valve seat 1, a fixed block inner sealing ring 13 is provided between the fixed block 10 and the upper valve seat 1, and a fixed block outer sealing ring 14 is provided between the fixed block 10 and the upper outer shell 9.

[0034] The specific work process is as follows: like Figure 1As shown, firstly, a soluble plastic ball 15 is inserted, falling into the valve body 5 and sealing it. Drilling fluid (mud) is pumped in from the end of the upper outer shell 9. The mud enters the upper valve seat 1. The mud pressure is less than the preset pressure, so the soluble plastic ball 15 will not dissolve or deform, and the valve body 5 remains closed. Under the action of the mud, the fixed stop 10, the floating piston sleeve 3, and the valve body 5 assembly move together towards the lower outer shell 8. Both the upper and lower outer shells 9 and 8 have reserved space for movement. During the movement, the return spring 6 is compressed. Since the floating piston sleeve 3 is connected to the spiral groove of the spiral groove turntable 2 via the stop pin 4, the spiral groove turntable 2 will rotate. In this embodiment, the rotation angle is 30° (preset position). The rotation angle is actually controlled by the connection between the floating piston sleeve flat key 29 and the first flat key keyway 30. When the floating piston sleeve flat key 29 reaches the end of the first flat key keyway 30, the spiral groove turntable 2 has rotated exactly 30°. At this time, the two ends of the drainage channel 17 are connected to the bypass hole 20 and the outlet 16 respectively. The mud flows along the drainage channel 17 towards the outlet 16 and ejects the plugging support capsule. (When the drainage channel 17 is connected to the bypass hole 20 and the outlet 16, a pressure difference will actually be generated inside and outside the well. This pressure difference will also adsorb the plugging support capsule outward. This adsorption force works together with the mud pressure.)

[0035] After the plugging support capsule is ejected, the upper section 25 and the lower section 28 of the soluble coating are dissolved by the downhole ambient temperature and the mud. The austenite temperature of the initial plugging support 27 is lower than the downhole ambient temperature, and it deforms into the activated plugging support 26 and seals the downhole fractures. It can automatically intercept rock cuttings of various sizes generated during the drilling process. Multiple activated plugging supports 26 can form a net-like plugging layer to achieve plugging while drilling.

[0036] Continue pumping in mud and pressurize it (at this point, the mud pressure is greater than the preset pressure). Under the enormous mud pressure, the soluble plastic ball 15 is squeezed and deformed, passing through the valve body 5 and entering the lower outer shell 8. It then gradually dissolves or is directly crushed by the drill bit. At this point, the valve body 5 is fully open, and the mud flows directly to the drill bit after passing through the valve body 5. Simultaneously, although the mud pressure increases, the pressure acting on the fixed stop 10 decreases sharply because the valve body 5 is open. The return spring 6 drives the fixed stop 10, the floating piston sleeve 3, and the valve body 5 assembly to move together towards the upper outer shell 9. The spiral groove turntable 2 rotates, and the two ends of the drainage channel 17 are misaligned, connecting the bypass hole 20 and the outlet 16 respectively. The mud only flows through the valve body 5 to the drill bit. Thus, the downhole plugging operation is completed, the mud flow returns to normal, and drilling operations are not affected.

[0037] It should be noted that, since the spiral groove 24 of the spiral groove turntable 2 is a wavy spiral groove 24, and is equipped with a positioning groove 23 and a spring pin 22, when the reset spring 6 drives the fixed stop block 10, the floating piston sleeve 3, and the valve body 5 assembly to move together towards the upper outer shell 9, the spring pin 22 and the positioning groove 23 restrict the spiral groove turntable 2 from rotating in the opposite direction, and the spiral groove turntable 2 will rotate forward 30° again to complete the reset. In addition, since multiple drainage channels 17 are provided and arranged around the circumference of the spiral groove turntable 2, when the effect of a single leak sealing operation is not good, a soluble plastic ball 15 can be put into the upper valve seat 1 again and the mud pressure can be reduced to close the valve. The above operation is repeated so that another drainage channel 17 connects to the bypass hole 20 and the outlet 16 respectively (the two drainage channels 17 are exactly 60° apart, and the spiral groove turntable 2 will inevitably connect the drainage channel 17 to the bypass hole 20 and the outlet 16 again after rotating twice), thereby releasing another batch of leak sealing support capsules. The number of drainage channels 17 is the number of times the above operation can be repeated, thereby controlling the specific location and sealing effect of the sealing operation.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A drilling-interventional self-expanding stent support and plugging system, characterized in that, include: The housing assembly has a valve body assembly that is slidably disposed inside along its length. A spiral groove turntable (2) is rotatably disposed within the outer shell assembly. A drainage channel (17) is defined within the spiral groove turntable (2), and a leak-stopping support capsule is stored within the drainage channel (17). A floating piston sleeve (3) is slidably disposed inside the housing assembly along the length direction of the housing assembly and is helically connected to the spiral groove turntable (2). A return spring (6) is provided between the floating piston sleeve (3) and the spiral groove turntable (2). A fixed stop (10) is connected to the floating piston sleeve (3) and to the valve body assembly; The valve body assembly has a bypass hole (20), and the outer shell assembly has a liquid storage port. When mud is introduced into the outer shell assembly, the valve body assembly closes, the fixed stop (10), the floating piston sleeve (3) and the valve body assembly move along the length of the outer shell assembly, the spiral groove turntable (2) rotates to a preset position, the drainage channel (17) connects the bypass hole (20) and the liquid outlet (16) and pops out the plugging bracket capsule; when the mud pressure is greater than the preset pressure, the valve body assembly opens, and the reset spring (6) resets the fixed stop (10), the floating piston sleeve (3) and the valve body assembly. The leak-sealing stent capsule includes: Upper section of soluble coating (25); The lower section (28) of the soluble coating is connected to the upper section (25) of the soluble coating and forms a hollow capsule-shaped structure; both the upper section (25) and the lower section (28) of the soluble coating are made of PGA material; The initial state plugging support (27) is set inside the capsule-shaped structure and is made of nickel-titanium shape memory alloy. When the plugging support capsule is ejected from the outlet (16) by the mud, the upper section (25) and the lower section (28) of the soluble coating are catalyzed by the downhole ambient temperature and dissolved by the mud. The austenite temperature of the initial state plugging support (27) is lower than the downhole ambient temperature, and it is deformed into an activated state plugging support (26) and seals the downhole fracture.

2. The drilling-interventional self-expanding support and plugging system according to claim 1, characterized in that, The outer casing assembly includes a lower outer casing (8) and an upper outer casing (9), with the liquid outlet (16) located on the upper outer casing (9).

3. The drilling-interventional self-expanding support and plugging system according to claim 2, characterized in that, The valve body assembly includes: The lower valve seat (7) has a lower outer shell keyway (19) on the lower outer shell (8), and the lower valve seat (7) is connected to the lower outer shell keyway (19) through the lower valve seat keyway (21); The upper valve seat (1) is connected to the lower valve seat (7) by a threaded connection and / or a snap-fit ​​connection. The upper valve seat (1) is connected to the lower outer shell keyway (19) by an upper valve seat key (31). The valve body (5) is disposed between the upper valve seat (1) and the lower valve seat (7); Soluble plastic ball (15), one end of the upper valve seat (1) extends toward the fixed stop (10) and communicates with the outside. The soluble plastic ball (15) can be inserted into the valve body (5) from one end of the upper valve seat (1). When the mud pressure is less than or equal to the preset pressure, the soluble plastic ball (15) closes the valve body (5). When the mud pressure is greater than the preset pressure, the soluble plastic ball (15) dissolves and the valve body (5) opens. The mud can pass through the upper valve seat (1), the valve body (5) and the lower valve seat (7) in sequence and flow out from the end of the lower outer shell (8).

4. The drilling-interventional self-expanding support and plugging system according to claim 3, characterized in that, The upper valve seat (1) is provided with an upper valve seat circumferential groove (35), and the lower valve seat (7) defines a lower valve seat buckle (34). The lower valve seat buckle (34) can be inserted into the upper valve seat (1) along the upper valve seat circumferential groove (35). After twisting the upper valve seat (1) and the lower valve seat (7), the lower valve seat buckle (34) engages with the upper valve seat circumferential groove (35), and the upper valve seat key (31) is aligned with the lower valve seat key (21).

5. A drilling-interventional self-expanding support and plugging system according to claim 3 or 4, characterized in that, The spiral groove turntable (2) has a spiral groove (24) at one end corresponding to the floating piston sleeve (3), and the floating piston sleeve (3) is connected to the spiral groove turntable (2) through a stop pin (4).

6. The drilling-interventional self-expanding support and plugging system according to claim 5, characterized in that, The spiral groove (24) is a wave-shaped spiral groove (24). The spiral groove turntable (2) has multiple positioning grooves (23) along the circumference. The positioning grooves (23) are arranged at intervals with the spiral groove (24). The upper outer shell (9) has spring pins (22) corresponding to the positioning grooves (23). The spring pins (22) are connected to the positioning grooves (23) to limit the rotation of the spiral groove turntable (2).

7. A drilling-interventional self-expanding support and plugging system according to claim 3 or 4, characterized in that, The floating piston sleeve (3) is provided with a floating piston sleeve key (29) on its outer side. The inner wall of the upper outer shell (9) is provided with a first keyway (30) along the length direction. The floating piston sleeve key (29) is connected to the first keyway (30). The fixed stop block (10) is provided with a fixed stop block key (32) on its outer side. The inner wall of the upper outer shell (9) is provided with a second keyway (33) along the length direction. The fixed stop block key (32) is connected to the second keyway (33). The first keyway (30) and the second keyway (33) are staggered.

8. The drilling-interventional self-expanding support and plugging system according to claim 3, characterized in that, The upper valve seat (1) and the lower valve seat (7) are connected by a first connecting thread (18), and the floating piston sleeve (3) and the fixed stop (10) are connected by a second connecting thread (36).

9. A drilling-interventional self-expanding support and plugging system according to claim 3, characterized in that, A valve body sealing ring (11) is provided on the outside of the valve body (5), a spiral groove turntable sealing ring (12) is provided between the spiral groove turntable (2) and the upper valve seat (1), a fixed block inner sealing ring (13) is provided between the fixed block (10) and the upper valve seat (1), and a fixed block outer sealing ring (14) is provided between the fixed block (10) and the upper outer shell (9).

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