A monitorable, sealable, soluble bridge plug structure

Abstract

This invention discloses a monitorable sealing soluble bridge plug structure, relating to the field of soluble bridge plug technology. It includes a push cylinder, a release lever, a central tube, and a sealing tube. A locking slip is provided on the side of the push ring near the conical inclined surface of the conical cylinder, and guide stop components are provided on both sides of the push ring. By setting the guide stop components, when the push cylinder pushes the push ring to move, the liquid injected into the second piston cylinder will squeeze the second piston block. During this process, the telescopic rod and telescopic spring contract, thereby allowing the telescopic spring to store elastic energy. When the guide plate separates from the positioning groove, the guide plate swings away from the center of the sealing tube, so that the end of the guide plate away from the L-shaped push plate will contact the inner wall of the pipe. When a soluble ball subsequently enters the pipe, the soluble ball will fall accurately into the interior of the sealing tube under the guidance of the guide plate, thus improving the accuracy of the soluble ball entering the sealing tube.

Description

Technical Field

[0001] This invention relates to the field of soluble bridge plug technology, specifically a monitorable sealed soluble bridge plug structure. Background Technology

[0002] In shale gas development, staged fracturing of shale gas wells is necessary, and bridge plugs play a crucial role in well sealing. Currently, soluble bridge plugs are mainly used in shale gas development. These plugs are made of soluble metal and biodegradable rubber and are used in conjunction with conventional setting tools. They are pumped into the well to achieve staged fracturing, allowing for direct oil testing and production after fracturing. During fracturing, pressure sensors monitor the pressure between two soluble bridge plugs to determine the sealing performance between adjacent plugs. Subsequently, the soluble bridge plugs dissolve rapidly under the action of flowback fluid, eliminating the need for retrieval or drilling. This facilitates production and subsequent operational procedures without any intervention.

[0003] After the soluble bridge plug is placed, a soluble ball needs to be inserted into one end of the bridge plug. The contact between the soluble ball and the plugging tube is used to achieve well segmentation. However, during the plugging process, the pusher ring needs to be moved and the rubber sleeve needs to be expanded through the cooperation of the pusher and the release rod. At this time, the diameter of the plugging tube at one end of the central tube will be smaller than the inner diameter of the pusher. When the pusher is pulled out after the rubber sleeve has expanded, there will be a gap between the outer wall of the plugging tube and the inner wall of the well pipe. When the soluble ball is put in, it will cause the soluble ball to collide with the plugging tube, which will also affect the docking accuracy between the soluble ball and the plugging tube. Summary of the Invention

[0004] The purpose of this invention is to provide a monitorable sealing soluble bridge plug structure to solve the problem of poor docking effect between the soluble ball and the plugging tube.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a monitorable sealing soluble bridge plug structure, comprising a push cylinder, a release lever, a central tube, and a sealing tube. The push cylinder and the release lever are connected by an external setting tool, and the sealing tube is connected to the release lever. The central tube is fixedly installed at one end of the sealing tube. A conical cylinder is installed on the outer wall of the central tube. A sealing rubber cylinder is provided on the central tube on one side of the conical cylinder. A push ring is provided on the outer side of the telescopic central tube, which is in contact with the push cylinder. A locking slip is provided on the side of the push ring near the conical inclined surface of the conical cylinder. Guide and anti-reverse components are provided on both sides of the push ring for guiding the soluble ball and locking the locking slip in one direction.

[0006] The guide anti-reverse component includes a splicing plate installed on the side of the conical cylinder near the push ring. A movable rod penetrating the push ring is provided on one side of the splicing plate. A first piston block is installed at one end of the movable rod. A first piston cylinder is fixedly connected to the side of the push ring away from the locking slip. The first piston block is located inside the first piston cylinder and is slidably connected to the first piston cylinder. A transition chamber is installed at the end of the first piston cylinder away from the push ring. A locking unit is provided inside the transition chamber.

[0007] As a further embodiment of the present invention: a flow guide port is provided at one end of the transition chamber near the first piston cylinder, and the transition chamber and the first piston cylinder are connected through the flow guide port.

[0008] As a further embodiment of the present invention: the guide stop further includes a first corrugated telescopic tube installed at the end of the transition chamber away from the first piston cylinder. One end of the first corrugated telescopic tube is equipped with a locking positioning ring connected to the outer wall of the central tube. A guide tube extending through to the other side of the locking positioning ring is provided on one side of the locking positioning ring. A second piston cylinder is connected to the side of the locking positioning ring away from the first corrugated telescopic tube. The first corrugated telescopic tube and the second piston cylinder are connected through the guide tube. A second piston block is slidably connected inside the second piston cylinder. A telescopic rod extending to the outside of the second piston cylinder is connected to one side of the second piston block. A movable ring is fixedly connected to one end of the telescopic rod. An L-shaped push plate is installed on the outer wall of the movable ring. A positioning groove is opened inside the sealing tube. One end of the L-shaped push plate extends into the positioning groove. A guide plate is rotatably connected to one end of the L-shaped push plate through a rotating shaft. A torsion spring is engaged on the outside of the rotating shaft connecting the guide plate and the L-shaped push plate. A telescopic spring is provided inside the telescopic rod.

[0009] As a further aspect of the present invention: the extension length of the first corrugated telescopic tube is equal to the moving distance of the first piston cylinder.

[0010] As a further embodiment of the present invention: the number of L-shaped push plates is set to multiple, and the multiple L-shaped push plates are distributed at equal distances along the center of the movable ring.

[0011] As a further embodiment of the present invention: the center of the sealing tube is coaxial with the center of the movable ring, and the center of the locking positioning ring is coaxial with the center of the push ring.

[0012] As a further embodiment of the present invention: the positioning unit includes a positioning plate installed on the inner wall of the transition chamber, the bottom of the positioning plate is rotatably connected to a baffle plate via a rotating shaft, a positioning frame is installed on the outer wall of the transition chamber, a guide rod extending to the inner side of the transition chamber is inserted into the bottom of the positioning frame, a limit plate is fixed at one end of the guide rod away from the center of the transition chamber, and a trapezoidal positioning block located inside the transition chamber is installed at the other end of the guide rod, the bottom of the trapezoidal positioning block is connected to a second corrugated telescopic tube connected to the inner wall of the transition chamber, and the second corrugated telescopic tube is located outside the guide rod.

[0013] As a further aspect of the present invention: the diameter of the barrier plate is larger than the diameter of the guide port, and a sealing gasket composed of soluble rubber is provided on the side of the barrier plate near the guide port.

[0014] As a further embodiment of the present invention: the top of the positioning frame is provided with a through hole with a diameter larger than that of the guide rod and smaller than that of the inner wall of the second corrugated telescopic tube.

[0015] As a further embodiment of the present invention: when the barrier plate is in a vertical state, the side of the trapezoidal locking block near the barrier plate is flush with the side of the barrier plate away from the guide port.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting a guide stop, when the pusher pushes the push ring to move, the liquid injected into the second piston cylinder will squeeze the second piston block. During this process, the telescopic rod and telescopic spring will contract, so that the telescopic spring can store elastic energy. When the pusher is pulled out of the pipe, the sealing tube will lose the obstruction of the pusher. At this time, the telescopic spring will drive the movable ring to move towards the sealing tube. When the guide plate separates from the positioning groove, the guide plate swings away from the center of the sealing tube. This allows the end of the guide plate away from the L-shaped push plate to contact the inner wall of the pipe. When the soluble ball enters the pipe, the soluble ball will fall accurately into the inside of the sealing tube under the guidance of the guide plate, thus improving the accuracy of the soluble ball entering the sealing tube.

[0018] 2. By setting up a positioning unit, during the process of the pusher ring moving before staged fracturing in the well, the solution inside the first piston cylinder will enter the transition chamber through the guide port. At this time, the baffle plate will swing under the impact of the aqueous solution. When the pressure inside the first piston cylinder and the transition chamber is balanced, the baffle plate will swing back to its original position. At this time, the baffle plate will block the guide port. During staged fracturing in the well, due to the increase in pressure between adjacent bridge plugs, the trapezoidal positioning block can move towards the center of the transition chamber. This allows one side of the trapezoidal locking block to fit against the side of the baffle plate away from the guide port, while the second corrugated telescopic tube extends. This prevents the baffle plate from swinging by blocking it with the trapezoidal locking block. At this time, the baffle plate and the first piston block will be in a sealed state, which prevents the first piston cylinder from moving along the movable rod, thereby preventing the push ring from moving and further improving the stability of the locking slip. This ensures that the sealing rubber sleeve continues to adhere tightly to the inner wall of the sleeve after setting, forming a reliable sealing barrier. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram showing the connection between the push ring and the sealing tube of the present invention;

[0021] Figure 3 This is a schematic diagram showing the connection between the conical cylinder and the locking positioning ring of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the sealing tube of the present invention;

[0023] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0024] Figure 6 This is a schematic diagram showing the connection between the first piston cylinder and the second piston cylinder of the present invention;

[0025] Figure 7 This is a schematic diagram showing the connection between the first corrugated telescopic tube and the second piston cylinder of the present invention;

[0026] Figure 8 This is a schematic diagram of the internal structure of the transition chamber of the present invention;

[0027] Figure 9 This is a schematic diagram showing the connection between the transition chamber and the trapezoidal locking block of the present invention.

[0028] In the diagram: 1. Push cylinder; 2. Release lever; 3. Push ring; 4. Locking slip; 5. Conical cylinder; 6. Sealing tube; 7. Central tube; 8. Sealing tube; 9. Movable ring; 10. L-shaped push plate; 11. Locking positioning ring; 12. First piston cylinder; 13. Splicing plate; 14. Movable rod; 15. First piston block; 16. Transition chamber; 17. First corrugated telescopic tube; 18. Guide plate; 19. Positioning groove; 20. Torsion spring; 21. Telescopic rod; 22. Second piston cylinder; 23. Telescopic spring; 24. Second piston block; 25. Guide tube; 26. Clamping plate; 27. Barrier plate; 28. Trapezoidal clamping block; 29. ​​Second corrugated telescopic tube; 30. Positioning frame; 31. Limiting plate; 32. Guide rod; 33. Guide port. Detailed Implementation

[0029] 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.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0031] Example 1

[0032] Please see Figures 1-9In this embodiment of the invention, a monitorable sealing soluble bridge plug structure includes a push cylinder 1, a release lever 2, a central tube 7, and a sealing tube 8. The push cylinder 1 and the release lever 2 are connected by an external setting tool. The sealing tube 8 is connected to the release lever 2. The central tube 7 is fixedly installed at one end of the sealing tube 8. A conical cylinder 5 is installed on the outer wall of the central tube 7. A sealing rubber cylinder 6 is provided on the central tube 7 on one side of the conical cylinder 5. A push ring 3 is provided on the outer side of the telescopic central tube 7, which is in contact with the push cylinder 1. A locking slip 4 is provided on the side of the push ring 3 near the conical inclined surface of the conical cylinder 5. Guide and anti-reverse parts are provided on both sides of the push ring 3 for guiding the soluble ball and locking the locking slip 4 in one direction.

[0033] The guide anti-reverse component includes a splicing plate 13 installed on the side of the conical cylinder 5 near the push ring 3. A movable rod 14 penetrating the push ring 3 is provided on one side of the splicing plate 13. A first piston block 15 is installed at one end of the movable rod 14. A first piston cylinder 12 is fixedly connected to the side of the push ring 3 away from the locking slip 4. The first piston block 15 is located inside the first piston cylinder 12 and is slidably connected to the first piston cylinder 12. A transition chamber 16 is installed at the end of the first piston cylinder 12 away from the push ring 3. A locking unit is provided inside the transition chamber 16.

[0034] The transition chamber 16 has a flow guide port 33 at one end near the first piston cylinder 12, and the transition chamber 16 and the first piston cylinder 12 are connected through the flow guide port 33.

[0035] In this embodiment, the pusher 1 is pushed to a designated position inside the well by the operation of an external setting tool. Then, the setting tool, pusher 1, and release lever 2 work together to make the locking slip 4 contact the inner wall of the pipe and expand the sealing sleeve 6. The locking slip 4 locks the expanded sealing sleeve 6, and the expansion of the sealing sleeve 6 makes the outer wall of the sealing sleeve 6 contact and seal with the inner wall of the pipe. When the pusher 1 pushes the push ring 3 to move, the first piston cylinder 12 moves along the movable rod 14. This allows the solution inside the first piston cylinder 12 to enter the transition chamber 16 under the pressure of the first piston block 15, thus guiding the stop. The ejector mechanism operates, and then the setting tool separates the push cylinder 1, release lever 2, and sealing tube 8. A soluble ball is then inserted, and the guide anti-reverse mechanism ensures the soluble ball accurately falls onto the inner wall of the sealing tube 8, thereby improving the accuracy of the soluble ball's sealing of the sealing tube 8. Next, the pipe is subjected to segmented pressure cracking. During this process, the pressure change within the pipe causes the locking unit to seal one end of the first piston cylinder 12, sealing the space between the first piston block 15 and the transition chamber 16. This prevents the push ring 3 from moving away from the conical cylinder 5, further improving the stability of the locking slip 4's contact with the inner wall of the pipe.

[0036] Example 2

[0037] Please refer to this carefully. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 The guide stop also includes a first corrugated telescopic tube 17 installed at the end of the transition chamber 16 away from the first piston cylinder 12. A locking positioning ring 11 connected to the outer wall of the central tube 7 is installed at one end of the first corrugated telescopic tube 17. A guide tube 25 extending through to the other side of the locking positioning ring 11 is provided on one side of the locking positioning ring 11. A second piston cylinder 22 is connected to the side of the locking positioning ring 11 away from the first corrugated telescopic tube 17. The first corrugated telescopic tube 17 and the second piston cylinder 22 are connected via the guide tube 25. The interior of the second piston cylinder 22 is slidably connected. There is a second piston block 24. One side of the second piston block 24 is connected to a telescopic rod 21 extending to the outside of the second piston cylinder 22. One end of the telescopic rod 21 is fixedly connected to a movable ring 9. An L-shaped push plate 10 is installed on the outer wall of the movable ring 9. A positioning groove 19 is opened inside the sealing tube 8. One end of the L-shaped push plate 10 extends into the positioning groove 19. One end of the L-shaped push plate 10 is rotatably connected to a guide plate 18 through a rotating shaft. A torsion spring 20 is engaged on the outside of the rotating shaft connecting the guide plate 18 and the L-shaped push plate 10. A telescopic spring 23 is provided inside the telescopic rod 21.

[0038] The first corrugated telescopic tube 17 has a telescopic length equal to the moving distance of the first piston cylinder 12. There are multiple L-shaped push plates 10, and the multiple L-shaped push plates 10 are distributed at equal distances along the center of the movable ring 9. The center of the sealing tube 8 is coaxial with the center of the movable ring 9, and the locking positioning ring 11 is coaxial with the center of the push ring 3.

[0039] In this embodiment, when the pusher 1 pushes the pusher ring 3 to move, the solution inside the first piston cylinder 12 will pass through the transition chamber 16, the first corrugated telescopic tube 17, and the guide tube 25 under the squeezing action of the first piston block 15 and enter the second piston cylinder 22. Due to the obstruction of the outer wall of the sealing tube 8 by the pusher 1, the liquid injected into the second piston cylinder 22 will squeeze the second piston block 24. At this time, the second piston block 24 will move away from the locking positioning ring 11. During this process, the telescopic rod 21 and the telescopic spring 23 will contract to allow the telescopic spring 23 to store elastic energy. When the pusher 1 is pulled out of the pipe, the sealing tube 8 will lose the obstruction of the pusher 1. When the block is engaged, the telescopic spring 23 will drive the movable ring 9 to move towards the sealing tube 8. This allows the L-shaped push plate 10 to push the guide plate 18 out of the positioning groove 19. When the guide plate 18 separates from the positioning groove 19, the end of the guide plate 18 away from the L-shaped push plate 10 will swing away from the center of the sealing tube 8 under the elastic restoring force of the torsion spring 20. This allows the end of the guide plate 18 away from the L-shaped push plate 10 to contact the inner wall of the pipe. When the soluble ball enters the pipe, it will fall accurately into the inside of the sealing tube 8 under the guidance of the guide plate 18, thereby improving the accuracy of the soluble ball entering the sealing tube 8.

[0040] Example 3

[0041] Please refer to this carefully. Figure 3 , Figure 8 , Figure 9 The positioning unit includes a positioning plate 26 installed on the inner wall of the transition chamber 16. The bottom of the positioning plate 26 is rotatably connected to a baffle plate 27 via a pivot. A positioning frame 30 is installed on the outer wall of the transition chamber 16. A guide rod 32 extending to the inner side of the transition chamber 16 is inserted into the bottom of the positioning frame 30. A limit plate 31 is fixed at one end of the guide rod 32 away from the center of the transition chamber 16. A trapezoidal positioning block 28 located inside the transition chamber 16 is installed at the other end of the guide rod 32. A second corrugated telescopic tube 29 connected to the inner wall of the transition chamber 16 is connected to the bottom of the trapezoidal positioning block 28. The second corrugated telescopic tube 29 is located outside the guide rod 32.

[0042] The diameter of the baffle plate 27 is larger than the diameter of the guide port 33. A sealing gasket composed of soluble rubber is provided on the side of the baffle plate 27 near the guide port 33. The top of the positioning frame 30 is provided with a through hole with a diameter larger than the guide rod 32 and smaller than the inner wall diameter of the second corrugated telescopic tube 29. When the baffle plate 27 is in a vertical state, the side of the trapezoidal locking block 28 near the baffle plate 27 is flush with the side of the baffle plate 27 away from the guide port 33.

[0043] In this embodiment, during the process of the pusher cylinder 1 pushing the pusher ring 3 to move before segmented fracturing in the well, the solution inside the first piston cylinder 12 enters the transition chamber 16 through the guide port 33. At this time, the baffle plate 27 will swing under the impact of the aqueous solution. When the pressure inside the first piston cylinder 12 and the transition chamber 16 is balanced, the baffle plate 27 will swing back to its original position. At this time, the baffle plate 27 will block the guide port 33. During segmented fracturing in the well, due to the increase in pressure between adjacent bridge plugs, the trapezoidal locking block 28 can move towards the center of the transition chamber 16. The trapezoidal locking block 28 is positioned so that one side of the baffle plate 27 is in contact with the side away from the guide port 33, while the second corrugated telescopic tube 29 extends. This prevents the baffle plate 27 from swinging by blocking it with the trapezoidal locking block 28. At this time, the baffle plate 27 and the first piston block 15 are in a sealed state, which prevents the first piston cylinder 12 from moving along the movable rod 14, thereby preventing the push ring 3 from moving. This further improves the stability of the locking slip 4 and ensures that the sealing sleeve 6 remains tightly attached to the inner wall of the sleeve after setting, forming a reliable sealing barrier.

[0044] The working principle of this invention is as follows: The external setting tool pushes the pusher 1 to a designated position within the well. Then, the setting tool, pusher 1, and release lever 2 work together to bring the locking slips 4 into contact with the inner wall of the pipe and cause the sealing sleeve 6 to expand. The locking slips 4 lock the expanded sealing sleeve 6, while the expansion of the sealing sleeve 6 seals its outer wall against the inner wall of the pipe. When the pusher 1 moves the pusher ring 3, the solution inside the first piston cylinder 12 is compressed by the first piston block 15, passing through the transition chamber 16, the first corrugated telescopic pipe 17, and the guide pipe 25 into the second piston cylinder 22. Due to the obstruction of the outer wall of the sealing pipe 8 by the pusher 1, the solution is injected into the second piston cylinder. The liquid inside piston 22 will compress the second piston block 24, causing it to move away from the locking positioning ring 11. During this process, the telescopic rod 21 and the telescopic spring 23 contract, allowing the telescopic spring 23 to store elastic energy. When the push cylinder 1 is pulled out of the pipe, the sealing pipe 8 will lose its obstruction. At this time, the telescopic spring 23 will drive the movable ring 9 to move towards the sealing pipe 8, thus allowing the L-shaped push plate 10 to push the guide plate 18 out of the positioning groove 19. When the guide plate 18 separates from the positioning groove 19, the end of the guide plate 18 away from the L-shaped push plate 10 will swing away from the center of the sealing pipe 8 under the elastic restoring force of the torsion spring 20. This allows the end of the guide plate 18 furthest from the L-shaped pusher plate 10 to contact the inner wall of the pipe. When the soluble ball subsequently enters the pipe, it will fall precisely into the sealing tube 8 under the guidance of the guide plate 18, thus improving the accuracy of the soluble ball entering the sealing tube 8. During the process of the pusher ring 3 being moved by the pusher cylinder 1 before the staged fracturing in the well, the solution inside the first piston cylinder 12 will enter the transition chamber 16 through the guide port 33. At this time, the baffle plate 27 will swing under the impact of the aqueous solution. When the pressure inside the first piston cylinder 12 and the transition chamber 16 is balanced, the baffle plate 27 will swing back. At this time, the baffle plate 27 will block the guide port 33. During the staged fracturing in the well... As the pressure between adjacent bridge plugs increases, the trapezoidal locking block 28 moves towards the center of the transition chamber 16, so that one side of the trapezoidal locking block 28 fits against the side of the baffle plate 27 away from the guide port 33. At the same time, the second corrugated telescopic tube 29 extends, so the baffle plate 27 is prevented from swinging by the trapezoidal locking block 28 blocking it. At this time, the baffle plate 27 and the first piston block 15 are in a sealed state, so the first piston cylinder 12 cannot move along the movable rod 14, thereby preventing the push ring 3 from moving, further improving the stability of the locking slip 4, and ensuring that the sealing sleeve 6 continues to adhere tightly to the inner wall of the sleeve after setting, forming a reliable sealing barrier.

[0045] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A monitorable sealed dissolvable bridge plug structure, comprising a push cylinder (1), a releasing rod (2), a central tube (7), a sealing tube (8), the push cylinder (1) and the releasing rod (2) are connected by an external setting tool, the sealing tube (8) is connected with the releasing rod (2), and the central tube (7) is fixedly installed at one end of the sealing tube (8), characterized in that, the push cylinder (1) is provided with a plurality of dissolvable bridges (3) arranged in the push cylinder (1) in a staggered manner, the dissolvable bridges (3) are arranged in the push cylinder (1) in a staggered manner, and the dissolvable bridges (3) are arranged in the push cylinder (1) in a staggered manner. The outer wall of the center pipe (7) is provided with a tapered cylinder (5), the center pipe (7) is provided with a sealing rubber tube (6) on one side of the tapered cylinder (5), the outer side of the center pipe (7) is provided with a push ring (3) in contact with the push cylinder (1), the push ring (3) is provided with a locking slip (4) on the side close to the tapered slope of the tapered cylinder (5), and the two sides of the push ring (3) are provided with guide retreat stoppers for guiding the soluble ball and unidirectionally locking the locking slip (4). The guide retreat stopper comprises a splicing plate (13) mounted on the side of the tapered cylinder (5) close to the push ring (3), one side of the splicing plate (13) is provided with a movable rod (14) penetrating through the push ring (3), one end of the movable rod (14) is provided with a first piston block (15), the side of the push ring (3) away from the locking slip (4) is fixedly connected with a first piston cylinder (12), the first piston block (15) is located on the inner side of the first piston cylinder (12) and is in sliding connection with the first piston cylinder (12), one end of the first piston cylinder (12) away from the push ring (3) is provided with a transition bin (16), and the inner side of the transition bin (16) is provided with a clamping unit.

2. A monitorable sealed dissolvable bridge plug structure according to claim 1, wherein, The transition bin (16) is provided with a flow guide opening (33) at one end close to the first piston cylinder (12), and the transition bin (16) and the first piston cylinder (12) are in communication through the flow guide opening (33).

3. A monitorable sealed dissolvable bridge plug structure as defined in claim 2, wherein, The guide retreat stopper further comprises a first corrugated expansion pipe (17) mounted on one end of the transition bin (16) away from the first piston cylinder (12), one end of the first corrugated expansion pipe (17) is provided with a locking positioning ring (11) connected with the outer wall of the center pipe (7), one side of the locking positioning ring (11) is provided with a flow guide pipe (25) penetrating to the other side of the locking positioning ring (11), the side of the locking positioning ring (11) away from the first corrugated expansion pipe (17) is connected with a second piston cylinder (22), the first corrugated expansion pipe (17) and the second piston cylinder (22) are in communication through the flow guide pipe (25), the second piston cylinder (22) is slidably connected with a second piston block (24) in the inside, one side of the second piston block (24) is connected with an expansion rod (21) extending to the outside of the second piston cylinder (22), one end of the expansion rod (21) is fixedly connected with a movable ring (9), the outer wall of the movable ring (9) is provided with an L-shaped push plate (10), the inside of the sealing pipe (8) is provided with a positioning groove (19), one end of the L-shaped push plate (10) extends into the inside of the positioning groove (19), one end of the L-shaped push plate (10) is rotatably connected with a guide plate (18) through a rotating shaft, the outer side of the rotating shaft connected with the L-shaped push plate (10) is clamped with a torsion spring (20), and the inside of the expansion rod (21) is provided with an expansion spring (23).

4. A monitorable sealed dissolvable bridge plug structure as defined in claim 3 wherein, The expansion length of the first corrugated expansion pipe (17) is equal to the movement distance of the first piston cylinder (12).

5. A monitorable sealed dissolvable bridge plug structure as defined in claim 3 wherein, The number of the L-shaped push plates (10) is multiple, and the multiple L-shaped push plates (10) are equidistantly distributed along the center of the movable ring (9).

6. A monitorable sealed bridge plug structure according to claim 3, wherein, The center of the sealing tube (8) is coaxial with the center of the movable ring (9), and the locking positioning ring (11) is coaxial with the center of the push ring (3).

7. A monitorable sealed dissolvable bridge plug structure as defined in claim 3 wherein, The clamping unit comprises a clamping plate (26) mounted on the inner wall of the transition bin (16), the bottom of the clamping plate (26) is rotationally connected with a blocking plate (27) through a rotating shaft, the outer wall of the transition bin (16) is provided with a positioning frame (30), the bottom of the positioning frame (30) is inserted with a guide rod (32) extending to the inner side of the transition bin (16), the end of the guide rod (32) away from the center of the transition bin (16) is fixed with a limiting plate (31), the other end of the guide rod (32) is provided with a trapezoidal clamping block (28) located in the inner side of the transition bin (16), the bottom of the trapezoidal clamping block (28) is connected with a second corrugated expansion pipe (29) connected with the inner wall of the transition bin (16), and the second corrugated expansion pipe (29) is located outside the guide rod (32).

8. A monitorable sealed bridge plug structure according to claim 7, wherein, The diameter of the blocking plate (27) is greater than that of the flow guide hole (33), and the side of the blocking plate (27) close to the flow guide hole (33) is provided with a sealing gasket composed of soluble rubber.

9. A monitorable sealed bridge plug structure according to claim 7, wherein, The top of the positioning frame (30) is provided with a through hole with a diameter greater than that of the guide rod (32) and less than that of the inner wall of the second corrugated expansion pipe (29).

10. A monitorable sealed bridge plug structure as defined by Claim 7 wherein, When the blocking plate (27) is in a vertical state, the side of the trapezoidal clamping block (28) close to the blocking plate (27) is flush with the side of the blocking plate (27) away from the flow guide hole (33).

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