Removable integrated intubation water injection bridge plug

Abstract

The utility model discloses a removable integrated intubation water injection bridge plug, which comprises an upper joint, a hydraulic cylinder, a mandrel, a piston, a push cylinder, an intubation tube, a bridge plug central tube and a setting mechanism, and the upper hydraulic cylinder is sleeved on the periphery of the middle lower part of the upper joint and is fixed through an anti-setting shear pin; an upper mandrel is screwed below the upper joint, and a cylinder bottom of an upper hydraulic cylinder is sleeved on the periphery of the upper mandrel; the upper part of the lower mandrel is connected with the lower end of the upper mandrel; the upper expanding section of the lower mandrel is connected with the piston; the lower hydraulic cylinder is connected with the upper hydraulic cylinder, the push cylinder is connected to the lower end of the lower hydraulic cylinder and abuts against the position above the setting mechanism, and the insertion pipe is connected to the lower end of the lower mandrel. The bridge plug central pipe sleeves the periphery of the insertion pipe and is connected with the insertion pipe through a releasing shear pin; the setting mechanism is sleeved on the periphery of the bridge plug central pipe, and the parallel ring guide shoe is screwed at the lower end of the bridge plug central pipe; the sliding sleeve check valve is inserted into the lower port of the bridge plug central pipe and is fixed through a sliding sleeve shear pin. According to the tool, bridge plug setting and intubation water injection can be completed by one tubular column, and drilling and grinding can be used for unblocking during unblocking without being influenced by shaft scaling and corrosion.

Description

Technical Field

[0001] This utility model relates to a downhole tool for oil fields, and more particularly to a retrievable integrated insertion pipe water injection bridge plug, belonging to the technical field of downhole water injection tools. Background Technology

[0002] In oilfield development and production, injecting appropriate amounts of water into the reservoir is a common method to maintain reservoir pressure, improve recovery rate, and increase well productivity. Water injection increases the pore pressure of the reservoir, reduces the viscosity of crude oil, and thus promotes the flow of crude oil towards the wellhead, facilitating crude oil extraction. The tubing-inserted water injection bridge plug, as an important downhole water injection tool, primarily functions to seal the upper layers or broken sections of the bridge plug and protect the casing, while simultaneously injecting water into the layers below the bridge plug.

[0003] However, the commonly used retrievable tubing-inserted water injection bridge plugs have some problems in practical applications. Their operation is relatively complex, requiring two runs of tubing to complete the water injection operation: the first run is for setting the bridge plug, and the second run is for inserting the tubing. This step-by-step operation not only increases operation time and cost but may also reduce operational efficiency due to the increased number of steps. Furthermore, in the unsealing stage, this type of bridge plug is retrieved and unsealed by running a retrieval tool. However, due to the long well workover cycle of water injection wells and the fact that most oilfields use wastewater reinjection, leading to severe scaling and corrosion in the wellbore, the unsealing process of retrievable tubing-inserted water injection bridge plugs faces significant difficulties, often requiring major workovers, causing considerable inconvenience and additional economic burdens to oilfield production. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] The purpose of this invention is to overcome the problems of cumbersome operation and difficult unsealing of the removable tubing water injection bridge plug in the prior art, and to provide a removable integrated tubing water injection bridge plug that can complete bridge plug setting and tubing water injection in one trip of tubing string, and can be unsealed by drilling and grinding, and is not affected by wellbore scaling and corrosion.

[0006] To solve the above technical problems, this utility model provides a removable integrated insert water-filling bridge plug, comprising an upper connector, an anti-sit shear pin, an upper liquid cylinder, an upper mandrel, a lower liquid cylinder, a piston, a lower mandrel, a push cylinder, a release shear pin, an insert tube, a bridge plug center tube, and a setting mechanism. The upper liquid cylinder is fitted onto the lower outer periphery of the upper connector and fixed by the anti-sit shear pin; the upper mandrel is screwed to the lower part of the upper connector, and the bottom of the upper liquid cylinder is fitted onto the outer periphery of the upper mandrel; the upper part of the lower mandrel is connected to the lower end of the upper mandrel, and the expanded diameter section of the upper part of the lower mandrel is connected to the piston; the lower liquid cylinder is connected to the upper liquid cylinder, the push cylinder is connected to the lower end of the lower liquid cylinder and abuts against the setting mechanism, and the insert tube is connected to the lower end of the lower mandrel; the bridge plug center tube is fitted onto the outer periphery of the insert tube and connected to the insert tube by the release shear pin; the setting mechanism is fitted onto the outer periphery of the bridge plug center tube and a ring guide shoe is screwed onto the lower end of the bridge plug center tube; a sliding sleeve check valve is inserted into the lower port of the bridge plug center tube and fixed by a sliding sleeve shear pin.

[0007] As an improvement of this utility model, the lower outer periphery of the upper connector is fitted with an upper connector sealing ring to achieve a seal with the lower inner wall of the upper liquid cylinder, and the upper mandrel is provided with a radial through hole that communicates with the hydraulic chamber of the upper liquid cylinder.

[0008] As a further improvement of this utility model, the upper part of the upper mandrel is an enlarged diameter upper mandrel large end, and the outer circumference of the upper mandrel large end is screwed into the central screw hole at the lower part of the upper connector.

[0009] As a further improvement of this utility model, the upper internal thread of the lower liquid cylinder is connected to the external thread of the bottom of the upper liquid cylinder.

[0010] As a further improvement of this utility model, the insertion tube and the bridge plug center tube are connected by a release scissor pin, and the lower outer wall of the insertion tube is fitted with multiple sealing rings to achieve a seal with the inner wall of the bridge plug center tube.

[0011] As a further improvement of this utility model, the sealing mechanism includes a pressure ring, a slip, a cone, an end rubber tube, and a middle rubber tube. The end rubber tubes are located on the upper and lower sides of the middle rubber tube, and the upper and lower ends of the end rubber tubes abut against the large end of the cone. The inclined surface of the cone cooperates with the slip. The top of the upper slip abuts against the lower part of the pressure ring, and the lower slip abuts against the top inclined surface of the connecting ring shoe.

[0012] As a further improvement of this utility model, the top inner circumference of the pressure ring abuts against the lower edge of the outer step of the bridge plug center tube, and the top outer circumference of the pressure ring abuts against the lower end of the push cylinder.

[0013] As a further improvement of this utility model, a steel ball is seated in the upper flared end of the sliding sleeve check valve. After the steel ball is pressed and cuts the sliding sleeve shear pin, the sliding sleeve check valve falls off and opens the through hole inside the bridge plug.

[0014] As a further improvement of this utility model, the top of the bridge plug center tube abuts against the lower part of the first outer step of the upper part of the insertion tube, and the inner step at the upper end of the bridge plug center tube abuts against the lower part of the second outer step of the upper part of the insertion tube.

[0015] As a further improvement of this utility model, the upper sealing section of the piston is fitted with an inner piston sealing ring to achieve a seal with the outer wall of the upper mandrel, and the outer wall of the piston is fitted with an outer piston sealing ring to achieve a seal with the inner wall of the lower cylinder.

[0016] As a further improvement of this utility model, the upper end internal thread of the pusher is connected to the cylinder bottom external thread of the lower liquid cylinder.

[0017] As a further improvement of this utility model, the inner step at the upper end of the bridge plug center tube abuts against the lower part of the second outer step at the upper part of the insertion tube.

[0018] As a further improvement of this utility model, the lower outer periphery of the insertion tube is fitted with two sets of sealing rings to achieve a seal with the outer wall of the bridge plug center tube, and each set of sealing rings has at least eight rings.

[0019] As a further improvement of this utility model, the outer wall of the middle part of the sliding sleeve check valve is provided with a sealing ring to achieve a seal with the inner wall of the bridge plug center tube; the lower outer step of the sliding sleeve check valve abuts against the lower part of the inner step of the bridge plug center tube.

[0020] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. Simplified operation process: The water injection bridge plug setting tool and the insertion tube are integrated into one unit. Only one run of the tubing is needed to complete the bridge plug setting and water injection. Compared with the traditional removable insertion tube water injection bridge plug, the operation steps are reduced, the operation time is greatly shortened, the operation efficiency is improved, and the operation cost is reduced.

[0021] 2. Improved unsealing reliability: The bridge plug is made of composite drillable material, which is easy to drill and remove. It is not affected by wellbore scaling and corrosion, avoiding major repair problems caused by unsealing difficulties, reducing the additional economic burden caused by harsh wellbore conditions, and improving the continuity and stability of oilfield production.

[0022] 3. Enhanced sealing performance: Through the tight cooperation of components such as pressure ring, slips, cone, end rubber sleeve, and middle rubber sleeve, as well as the sealing effect of sealing ring, the bridge plug is guaranteed to have good sealing performance after setting, effectively sealing the upper layer or leakage section of the bridge plug, protecting the casing, and ensuring that water can smoothly enter the lower layer of the bridge plug, thus improving the water injection effect.

[0023] 4. Easy to operate and control: The bridge plug is set, released and water injected by pressurizing the tubing. The operation is simple and easy to control. The operation steps and parameters can be flexibly adjusted according to actual needs to adapt to different water injection conditions in oilfields.

[0024] 5. Improve water injection efficiency: After water injection is completed, the through hole inside the bridge plug is opened, and the water flow channel is unobstructed, which can effectively improve water injection efficiency, increase water injection volume, better meet the water injection needs of the oil layer, and further improve the recovery rate and production capacity of the oil well. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0026] Figure 1 This is a cross-sectional view of the removable integrated insertion tube water injection bridge plug of this utility model;

[0027] In the diagram: 1. Upper connector; 2. Anti-sit shear pin; 3. Upper liquid cylinder; 4. Upper mandrel; 5. Lower liquid cylinder; 6. Piston; 7. O-ring; 8. Lower mandrel; 9. Push cylinder; 10. Release shear pin; 11. Insert tube; 12. Bridge plug center tube; 13. Pressure ring; 14. Slipper; 15. Cone; 16. End rubber sleeve; 17. Middle rubber sleeve; 18. Parallel ring guide shoe; 19. Sliding sleeve check valve; 20. Sliding sleeve shear pin. Detailed Implementation

[0028] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0029] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0031] like Figure 1As shown, the removable integrated insertion tube water injection bridge plug of this utility model mainly includes an upper connector 1, an anti-sit shear pin 2, an upper liquid cylinder 3, an upper mandrel 4, a lower liquid cylinder 5, a piston 6, an O-ring 7, a lower mandrel 8, a push cylinder 9, a release shear pin 10, an insertion tube 11, a bridge plug center tube 12, a pressure ring 13, a slipper 14, a cone 15, an end rubber cylinder 16, a middle rubber cylinder 17, a parallel ring guide shoe 18, a sliding sleeve check valve 19, and a sliding sleeve shear pin 20, etc.

[0032] The upper cylinder body of the upper liquid cylinder 3 is fitted onto the lower outer periphery of the upper connector 1. Two upper connector sealing rings are embedded in the lower outer periphery of the upper connector 1 to achieve a seal with the lower inner wall of the upper liquid cylinder 3. The top of the upper liquid cylinder 3 rests against the lower outer step of the upper connector 1, and the upper part of the upper liquid cylinder 3 is fixedly connected to the upper connector 1 by anti-sit shear pins 2.

[0033] The upper part of the upper mandrel 4 is the enlarged end of the upper mandrel. The outer circumference of the upper mandrel large end is screwed into the central screw hole at the lower part of the upper connector 1. The bottom of the upper liquid cylinder 3 abuts against the outer step of the upper mandrel large end and is fitted onto the outer circumference of the upper mandrel 4. Two upper liquid cylinder sealing rings are embedded in the inner circumferential wall of the bottom of the upper liquid cylinder 3 to achieve a seal with the outer wall of the upper mandrel 4.

[0034] The lower end of the upper connector 1 and the bottom of the upper cylinder 3 form the hydraulic chamber of the upper cylinder 3. The lower circumference of the large end of the upper mandrel is provided with a radial through hole that communicates with the hydraulic chamber of the upper cylinder 3.

[0035] The upper part of the lower mandrel 8 is provided with a lower mandrel expansion section. Both the inner and outer walls of the lower mandrel expansion section are provided with threads. The lower end of the upper mandrel 4 is screwed into the inner thread of the lower mandrel expansion section. The outer thread of the lower mandrel expansion section is screwed into the lower center threaded hole of the piston 6. The upper sealing section of the piston 6 is fitted with an inner piston sealing ring to achieve a seal with the outer wall of the upper mandrel 4. The outer wall of the piston 6 is fitted with two outer piston sealing rings to achieve a seal with the inner wall of the lower liquid cylinder 5. The upper end of the lower liquid cylinder 5 is internally threaded and connected to the bottom external thread of the upper liquid cylinder 3.

[0036] The inner circumference of the bottom of the lower cylinder 5 is sealed to the outer wall of the lower mandrel 8 through the O-ring 7. The bottom of the piston 6 and the bottom of the lower cylinder 5 form the hydraulic chamber of the lower cylinder 5. The lower circumference of the expanded section of the lower mandrel is provided with a radial through hole that communicates with the hydraulic chamber of the lower cylinder 5.

[0037] The upper internal thread of the pusher 9 is connected to the external thread of the bottom of the lower liquid cylinder 5, and the upper internal thread of the insertion tube 11 is connected to the external thread of the lower end of the lower mandrel 8. The bridge plug center tube 12 is sleeved on the outer circumference of the insertion tube 11. The upper end of the bridge plug center tube 12 is connected to the insertion tube 11 through the release scissor pin 10. The top of the bridge plug center tube 12 abuts against the lower part of the first outer step of the insertion tube 11, and the inner step of the upper end of the bridge plug center tube 12 abuts against the lower part of the second outer step of the insertion tube 11. The lower outer wall of the insertion tube 11 is fitted with two sets of sealing rings to seal against the inner wall of the bridge plug center tube 12. Each set of sealing rings has at least eight rings.

[0038] The upper and lower sides of the middle rubber cylinder 17 are respectively provided with end rubber cylinders 16. The upper and lower ends of the end rubber cylinders 16 abut against the large end of the cone 15. The inclined surface of the cone 15 cooperates with the slip 14. The top of the upper slip 14 abuts against the lower part of the pressure ring 13. The inner circumference of the top of the pressure ring 13 abuts against the lower part of the outer step of the bridge plug center tube 12, limiting the upper stroke of the pressure ring 13. The outer circumference of the top of the pressure ring 13 abuts against the lower end of the push cylinder 9, so that the push cylinder 9 can push the pressure ring 13 downward.

[0039] The pressure ring 13, slip 14, cone 15, end rubber sleeve 16, and middle rubber sleeve 17 are sequentially fitted onto the bridge plug center tube 12, and the ring shoe 18 is screwed onto the lower outer circumference of the bridge plug center tube 12 through internal thread.

[0040] The sliding sleeve check valve 19 is inserted into the lower port of the bridge plug center tube 12 from bottom to top. The lower outer step of the sliding sleeve check valve 19 abuts against the lower inner step of the bridge plug center tube 12 to achieve a limit. The middle outer wall of the sliding sleeve check valve 19 is provided with a sealing ring to achieve a seal with the inner wall of the bridge plug center tube 12. A steel ball is seated in the upper flared mouth of the sliding sleeve check valve 19. The sliding sleeve shear pin 20 fixes the sliding sleeve check valve 19 to the bridge plug center tube 12.

[0041] The innovation of this tool lies in integrating the water injection bridge plug setting tool and the insertion tube into one unit. During use, only one run of tubing is needed to set the bridge plug and insert the insertion tube for water injection. Furthermore, the bridge plug is made entirely of a composite drillable material, making it easy to drill and remove, unaffected by wellbore scaling and corrosion, thus avoiding major overhauls due to difficulties in unsealing.

[0042] The working principle and operation process of this tool are as follows: 1. Connect the upper connector 1 of the quick-drilling integrated water injection bridge plug to the tubing string, lower it to the designed position downhole, and then pressurize it through the tubing.

[0043] 2. Liquid enters the bridge plug setting tool and the center hole of the bridge plug. The bridge plug setting tool consists of an upper connector 1, an anti-sit shear pin 2, an upper liquid cylinder 3, an upper mandrel 4, a lower liquid cylinder 5, a piston 6, an O-ring 7, a lower mandrel 8, a push cylinder 9, a release shear pin 10, and an insertion tube 11.

[0044] 3. Liquid enters the annular space, i.e., the hydraulic chamber, between the upper connector 1 and the upper liquid cylinder 3 through the radial through hole of the upper mandrel 4, pushing the liquid cylinder 3 downward and causing the anti-sitting shear pin 2 to be sheared; at the same time, liquid enters the annular space and hydraulic chamber between the lower mandrel 8 and the lower liquid cylinder 5 through the radial through hole of the lower mandrel 8, pushing the lower liquid cylinder 5 downward, and the lower liquid cylinder 5 pushes the pusher cylinder 9 downward.

[0045] 4. Since the parallel ring guide shoe 18 is fixed at the lower end of the bridge plug center tube 12, the pusher 9 squeezes the pressure ring 13, slip 14, cone 15, end rubber tube 16, and middle rubber tube 17, causing the slip 14 and rubber tube to open, and the bridge plug completes the setting seal.

[0046] 6. After the bridge plug is set, the setting tool moves upward under the reaction force, and the insertion tube 11 is pulled upward by the lower mandrel 8, causing the release shear pin 10 to be cut off, and the bridge plug is released.

[0047] 7. Lower the tubing string and reinsert the insertion tube 11 into the bridge plug center tube 12 to form a seal.

[0048] 8. When the oil pipe is pressurized, the sliding sleeve check valve 19 moves downward under pressure, causing the sliding sleeve shear pin 20 to be sheared. The sliding sleeve check valve 19 disengages and falls out from the lower port of the bridge plug center tube 12, opening the through hole in the bridge plug, allowing water to be injected.

[0049] 9. After water injection is completed, remove the tubing string, and the bridge plug setting tool is removed along with the tubing string. Then, use a drilling tool to remove the bridge plug.

[0050] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A removable integrated insertion tube water injection bridge plug, characterized in that, The system includes an upper connector (1), an anti-sit shear pin (2), an upper liquid cylinder (3), an upper mandrel (4), a lower liquid cylinder (5), a piston (6), a lower mandrel (8), a push cylinder (9), a release shear pin (10), an insertion tube (11), a bridge plug center tube (12), and a setting mechanism. The upper liquid cylinder (3) is fitted around the lower middle outer periphery of the upper connector (1) and fixed by the anti-sit shear pin (2). The upper mandrel (4) is screwed to the lower part of the upper connector (1), and the bottom of the upper liquid cylinder (3) is fitted around the outer periphery of the upper mandrel (4). The upper part of the lower mandrel (8) is connected to the lower end of the upper mandrel (4), and the upper part of the lower mandrel has an expansion joint. The diameter section is connected to the piston (6); the lower liquid cylinder (5) is connected to the upper liquid cylinder (3); the push cylinder (9) is connected to the lower end of the lower liquid cylinder (5) and abuts against the upper part of the setting mechanism; the insertion tube (11) is connected to the lower end of the lower mandrel (8); the bridge plug center tube (12) is sleeved on the outer circumference of the insertion tube (11) and connected to the insertion tube (11) through the release scissor pin (10); the setting mechanism is sleeved on the outer circumference of the bridge plug center tube (12) and the ring shoe (18) is screwed to the lower end of the bridge plug center tube (12); the sliding sleeve check valve (19) is inserted into the lower port of the bridge plug center tube (12) and fixed by the sliding sleeve scissor pin (20).

2. The retrievable integral plug and perf bridge plug of claim 1, wherein, The lower outer periphery of the upper connector (1) is fitted with an upper connector sealing ring to achieve a seal with the lower inner wall of the upper liquid cylinder (3). The upper mandrel is provided with a radial through hole that communicates with the hydraulic chamber of the upper liquid cylinder (3).

3. The retrievable integral plug and perf bridge plug of claim 1, wherein, The upper part of the upper mandrel (4) is the enlarged diameter upper mandrel large end, and the outer circumference of the upper mandrel large end is screwed into the central screw hole at the lower part of the upper connector (1).

4. The retrievable integral plug and perf bridge plug of claim 1, wherein, The upper internal thread of the lower liquid cylinder (5) is connected to the lower external thread of the upper liquid cylinder (3).

5. The retrievable integral plug and perf bridge plug of claim 1, wherein, The insertion tube (11) is connected to the bridge plug center tube (12) by a drop screw (10), and the lower outer wall of the insertion tube (11) is fitted with multiple sealing rings to seal the inner wall of the bridge plug center tube (12).

6. The retrievable integral plug and perf bridge plug of claim 1, wherein, The sealing mechanism includes a pressure ring (13), a slip (14), a cone (15), an end rubber tube (16), and a middle rubber tube (17). The end rubber tube (16) is located on the upper and lower sides of the middle rubber tube (17). The upper and lower ends of the end rubber tube (16) abut against the large end of the cone (15). The inclined surface of the cone (15) cooperates with the slip (14). The top of the upper slip (14) abuts against the lower part of the pressure ring (13), and the lower slip (14) abuts against the top inclined surface of the connecting ring guide shoe (18).

7. The retrievable integral plug and perf bridge plug of claim 6, wherein, The inner circumference of the top of the pressure ring (13) abuts against the outer step of the bridge plug center tube (12), and the outer circumference of the top of the pressure ring (13) abuts against the lower end of the pusher (9).

8. The retrievable integral plug and perf bridge plug of claim 1, wherein, A steel ball is seated in the upper flared end of the sliding sleeve check valve (19). When the steel ball is pressed, it cuts the sliding sleeve shear pin (20), and the sliding sleeve check valve (19) falls off and opens the through hole inside the bridge plug.

9. The retrievable integral plug and perf bridge plug of claim 1, wherein, The top of the bridge plug center tube (12) abuts against the lower part of the first outer step of the upper part of the insertion tube (11), and the inner step of the upper end of the bridge plug center tube (12) abuts against the lower part of the second outer step of the upper part of the insertion tube (11).

10. The retrievable integral plug and perf bridge plug of claim 1, wherein, The upper sealing section of the piston (6) is fitted with an inner piston sealing ring to achieve a seal with the outer wall of the upper mandrel (4), and the outer wall of the piston (6) is fitted with an outer piston sealing ring to achieve a seal with the inner wall of the lower liquid cylinder (5).

11. The retrievable integral plug and perf bridge plug of claim 1, wherein, The upper internal thread of the pusher (9) is connected to the external thread of the bottom of the lower liquid cylinder (5).

12. The retrievable integral plug and perf bridge plug of claim 1, wherein, The inner step at the upper end of the bridge plug center tube (12) abuts against the lower part of the second outer step at the upper part of the insertion tube (11).

13. The retrievable integral plug and perf bridge plug of claim 1, wherein, The lower outer periphery of the cannula (11) is fitted with two sets of sealing rings to seal the outer wall of the bridge plug center tube (12), and each set of sealing rings has at least eight rings.

14. The retrievable integral plug and perf bridge plug of claim 1, wherein, The middle outer wall of the sliding sleeve check valve (19) is provided with a sealing ring, which seals with the inner wall of the bridge plug center tube (12); the lower outer step of the sliding sleeve check valve (19) abuts against the lower inner step of the bridge plug center tube (12).

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