A hydraulically set bridge plug

Abstract

The present application provides a hydraulically sealed bridge plug, which relates to the field of downhole tools in oil and gas fields, including a plug body, a center tube arranged in the plug body, an overpressure hole arranged on the center tube, a sealing piston, a rubber cylinder and a slip arranged on the outside of the center tube, a ball seat arranged at the bottom of the center tube, and a limit ring arranged in the center tube. In order to solve the problem in the prior art that when the bridge plug is unsealed, it is necessary to first remove the sealing ball and release the pressure, and the pressure cannot be released normally, which will cause damage to the internal parts of the bridge plug, the present application achieves a balance of pressure above and below the bottom of the plug body through the provision of a pressure relief mechanism and a connecting mechanism, thereby improving work efficiency; through the provision of the pressure relief mechanism and the connecting mechanism, the problem in the prior art that the rubber cylinder and the slip cause damage to the inner wall of the oil and gas well due to friction with the rubber cylinder and the slip in the oil and gas well is solved; through the provision of the pressure relief mechanism and the connecting mechanism, the problem in the prior art of high cost caused by the disposable use of the bridge plug is solved.

Description

Technical Field

[0001] The present invention relates to the field of downhole tools in oil and gas fields, and in particular to a hydraulically set bridge plug. Background Art

[0002] A hydraulically set bridge plug is a downhole tool used in oil and gas well operations. It is primarily used to temporarily or permanently seal oil, gas, and water layers. Pressure is generated through hydraulic, mechanical, or explosive means to activate the anchoring and sealing mechanisms of the bridge plug, thereby sealing the oil and gas well.

[0003] For example, the "hydraulic set bridge plug" disclosed in the Chinese invention patent (application number: 201810034660.X) discloses in its specification: it includes a center tube, a rubber sleeve and slips, the rubber sleeve is sleeved on the outside of the center tube, and the slips are installed around the center tube through a slip installation sleeve. It also includes an upper cone sleeve A, a lower cone sleeve A, an upper cone sleeve B, a lower cone sleeve B, a setting piston, a retaining spring and a back-off sleeve, and the upper cone sleeve A, the lower cone sleeve A, the upper cone sleeve B, the lower cone sleeve B, the setting piston, the retaining spring and the back-off sleeve are all sleeved on the center tube. The upper end of the hydraulically set bridge plug is provided with a release mechanism, and the lower end of the hydraulically set bridge plug is provided with a sealing ball, which is encapsulated in a ball seat by a limit ring;

[0004] However, the above-mentioned hydraulically set bridge plug still has some deficiencies in actual use: In the above-mentioned prior art, the rubber sleeve and slips are driven by hydraulic pressure to expand and fix the bridge plug. However, when the bridge plug needs to be taken out, when it is necessary to unseal and remove the bridge plug, if the sealing ball has been installed, it is necessary to remove the sealing ball before unseal. Because the sealing ball will block the smooth flow of the hydraulic flow channel, it is impossible to effectively release the pressure during unseal, so that the bridge plug cannot be properly unsealed and the pressure cannot be properly released. As a result, the internal parts of the bridge plug (such as slips, rubber sleeve, etc.) will be subjected to excessive pressure or stress, thereby causing damage;

[0005] Therefore, we made improvements to this problem and proposed a hydraulically set bridge plug. Summary of the Invention

[0006] The purpose of the present invention is to address the problem that when the existing bridge plug is unsealed, it is necessary to first remove the sealing ball and release the pressure, but the pressure cannot be released normally, which will cause damage to the internal parts of the bridge plug.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides a hydraulically set bridge plug to improve the above-mentioned problem.

[0008] The specific application is as follows:

[0009] The device comprises a plug body, a central tube arranged in the plug body, an overpressure hole arranged on the central tube, a setting piston, a rubber cylinder and slips arranged outside the central tube, a ball seat arranged at the bottom of the central tube, a limiting ring arranged in the central tube, a sealing ball arranged in the ball seat, a pressure relief mechanism arranged on the plug body, and a connecting mechanism arranged on the plug body;

[0010] The pressure relief mechanism includes a guide groove provided in the central tube, a push rod slidably provided on the guide groove, a pressure relief groove provided in the central tube, and a blocking ring slidably provided on the pressure relief groove;

[0011] The connecting mechanism comprises a connecting pipe threadedly connected to the plug body and an extension portion arranged on the connecting pipe.

[0012] As a preferred technical solution of the present application, the pressure relief mechanism includes a spring 1 arranged in the pressure relief groove, the two ends of the spring 1 are respectively connected to the corresponding surfaces of the blocking ring and the pressure relief groove, and the pushing rod 1 and the ball seat are both arranged on the blocking ring.

[0013] As a preferred technical solution of the present application, a second push rod is slidably provided on the guide groove, and the second push rod is adapted to the connecting pipe.

[0014] As a preferred technical solution of the present application, a transmission cylinder is slidably provided on the central tube, the transmission cylinder is provided on the rubber cylinder, and a pulling block is provided in the transmission cylinder.

[0015] As the preferred technical solution of the present application, a driving shaft is provided on the second pushing rod, an adjusting block is provided on the pulling block, the adjusting block is slidingly provided on the first pushing rod, a transmission shaft is provided on the adjusting block, a sliding rod is rotatably provided on the driving shaft, and the sliding rod is rotatably provided on the transmission shaft.

[0016] As a preferred technical solution of the present application, a protrusion is provided on the pulling block, and the protrusion is adapted to the sliding cylinder.

[0017] As a preferred technical solution of the present application, the extension portion and the push rod are adapted to each other.

[0018] As a preferred technical solution of the present application, a strip groove is provided on the pushing rod 1, the adjusting block is slidably provided on the strip groove, a spring 2 is provided on the strip groove, and the two ends of the spring 2 are respectively connected to the corresponding surfaces of the strip groove and the adjusting block.

[0019] As a preferred technical solution of the present application, an offset groove is provided on the central tube, the transmission cylinder is slidably provided on the offset groove, and the offset groove is matched with the push rod.

[0020] As a preferred technical solution of the present application, a drainage hole is provided on the ball seat, and the drainage hole is adapted to the pressure relief groove.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the scheme of this application:

[0023] 1. To address the problem in the prior art that, when unsealing a bridge plug, the sealing ball must be removed and pressure released, which prevents normal pressure release and causes damage to internal parts of the bridge plug, the present invention provides a pressure relief mechanism and a connection mechanism. By driving the pressure relief groove to leak, the pressure above and below the bottom of the bridge plug is balanced without removing the sealing ball, thereby improving work efficiency.

[0024] 2. The pressure relief mechanism and connection mechanism drive the rubber sleeve and slips to reset, preventing the rubber sleeve and slips from damaging the inner wall of the oil and gas well when the plug is removed, thus solving the problem of damage to the inner wall of the oil and gas well caused by friction between the rubber sleeve and slips in the prior art.

[0025] 3. By providing a pressure relief mechanism and a connection mechanism, the plug body can be kept in good condition and reused when it is retracted, thus solving the high cost problem caused by the one-time use of the bridge plug in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of the hydraulically set bridge plug provided for this application;

[0027] Figure 2 The hydraulically set bridge plug provided for this application Figure 1 Schematic diagram of the enlarged structure of area A in the middle;

[0028] Figure 3 The hydraulically set bridge plug provided for this application Figure 1 Schematic diagram of the enlarged structure of the middle B area;

[0029] Figure 4 The hydraulically set bridge plug provided for this application Figure 1 Schematic diagram of the enlarged structure of the middle C area;

[0030] Figure 5 The hydraulically set bridge plug provided for this application Figure 1 Schematic diagram of the explosion structure in the middle part;

[0031] Figure 6 The hydraulically set bridge plug provided for this application Figure 5 Schematic diagram of the enlarged structure of area D in the middle.

[0032] Indicated in the figure:

[0033] 1. Plug body; 101. Center tube; 102. Overpressure hole; 103. Setting piston; 104. Rubber cartridge; 105. Slips; 106. Ball seat; 107. Limiting ring; 108. Sealing ball;

[0034] 2. Pressure relief mechanism; 201. Guide groove; 202. Push rod 1; 203. Pressure relief groove; 204. Blocking ring; 205. Spring 1; 206. Push rod 2; 207. Transmission cylinder; 208. Pull block; 209. Drive shaft; 210. Adjustment block; 211. Transmission shaft; 212. Sliding rod; 213. Raised portion; 214. Strip groove; 215. Spring 2; 216. Offset groove; 217. Drainage hole;

[0035] 3. Connecting mechanism; 301. Connecting pipe; 302. Extension portion. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0037] As described in the background art, when the bridge plug is unsealed, the sealing balls need to be removed first and the pressure needs to be released. If the pressure cannot be released normally, the parts inside the bridge plug will be damaged.

[0038] In order to solve this technical problem, the present invention provides a hydraulically set bridge plug, which is applied to downhole tools.

[0039] Specifically, please refer to Figures 1-6 As shown, the hydraulically set bridge plug specifically includes: a plug body 1, a central tube 101 arranged in the plug body 1, an overpressure hole 102 arranged on the central tube 101, a setting piston 103, a rubber cylinder 104 and a slip 105 arranged outside the central tube 101, a ball seat 106 arranged at the bottom of the central tube 101, a limiting ring 107 arranged in the central tube 101, a sealing ball 108 arranged in the ball seat 106, and also includes a pressure relief mechanism 2 arranged on the plug body 1, In the prior art, the connection mechanism 3 on the plug body 1 is such that when the central pipe 101 is hydraulically pressurized, the hydraulic fluid enters the overpressure hole 102 and acts on the setting piston 103, causing the setting piston 103 to drive the rubber sleeve 104 and slips 105 to expand and fix the plug body 1 in the oil and gas well. The expansion of the rubber sleeve 104 and slips 105 sets the oil and gas well. The sealing ball 108 is used to seal the central pipe 101, and the limiting ring 107 is used to limit the sealing ball 108.

[0040] The pressure relief mechanism 2 includes a guide groove 201 provided in the central tube 101, a push rod 202 slidably provided on the guide groove 201, a pressure relief groove 203 provided in the central tube 101, and a blocking ring 204 slidably provided on the pressure relief groove 203;

[0041] The connecting mechanism 3 includes a connecting tube 301 threadedly connected to the plug body 1 and an extending portion 302 provided on the connecting tube 301 .

[0042] The hydraulically set bridge plug provided by the present invention solves the problem in the prior art that when unsealing the bridge plug, the sealing ball 108 needs to be removed and the pressure released first, and the pressure cannot be released normally, which may cause damage to the internal parts of the bridge plug. The present application provides a pressure relief mechanism 2 and a connecting mechanism 3, which drive the pressure relief groove 203 to leak, thereby achieving pressure balance above and below the bottom of the plug body 1 without removing the sealing ball 108, thereby improving work efficiency.

[0043] The pressure relief mechanism 2 and the connecting mechanism 3 drive the rubber sleeve 104 and the slips 105 to reset, thereby preventing the rubber sleeve 104 and the slips 105 from damaging the inner wall of the oil and gas well when the plug body 1 is removed, thereby solving the problem of the rubber sleeve 104 and the slips 105 damaging the inner wall of the oil and gas well due to friction in the prior art.

[0044] By providing the pressure relief mechanism 2 and the connection mechanism 3, the plug body 1 can be kept in good condition and reused when the plug body 1 is retracted, thus solving the high cost problem caused by the one-time use of the bridge plug in the prior art.

[0045] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0048] Example 1, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, a hydraulically set bridge plug, whose pressure relief mechanism 2 includes a spring 205 arranged in a pressure relief groove 203, the two ends of the spring 205 are respectively connected to the corresponding surfaces of the blocking ring 204 and the pressure relief groove 203, the push rod 202 and the ball seat 106 are both arranged on the blocking ring 204, and the connecting pipe 301 is connected to the pipeline for conveying hydraulic pressure in the prior art. When in use, the plug body 1 is rotated and fixed on the connecting pipe 301, and the plug body 1 is sent into the oil and gas well, and the hydraulic liquid is conveyed to make the rubber cylinder 104 and the slips 105 set. When the plug body 1 needs to be taken out of the oil and gas well, as shown in FIG. Figure 1 As shown, by driving the push rod 1 202 to slide downward, the push rod 1 202 drives the ball seat 106 and the blocking ring 204 to move downward, so that the pressure relief groove 203 leaks, and then the central pipe 101 is connected with the oil and gas well. The liquid in the oil and gas well enters the central pipe 101, so that the pressure above and below the bottom of the plug body 1 is balanced. In this way, the pressure above and below the plug body 1 can be balanced without removing the sealing ball 108;

[0049] Furthermore, a second push rod 206 is slidably provided on the guide groove 201, and the second push rod 206 is adapted to the connecting pipe 301, as shown in FIG. Figure 2 As shown, the second push rod 206 and the connecting pipe 301 are in close contact. When hydraulic pressure is applied in the central pipe 101, the force exerted by the hydraulic fluid on the push rod causes the second push rod 206 to be in close contact with the guide groove 201. This prevents the hydraulic fluid from driving the second push rod 206 downward, thereby preventing leakage from the pressure relief groove 203.

[0050] Furthermore, a transmission cylinder 207 is slidably provided on the central tube 101, and the transmission cylinder 207 is provided on the rubber cylinder 104. A pulling block 208 is provided in the transmission cylinder 207. Figure 3 As shown, when the transmission cylinder 207 moves to the left, the transmission cylinder 207 drives the rubber cylinder 104 that is being set to reset. When the rubber cylinder 104 is reset, the slips 105 are reset one after another, and then the plug body 1 can be taken out.

[0051] Furthermore, a driving shaft 209 is provided on the second pushing rod 206, an adjusting block 210 is provided on the pulling block 208, the adjusting block 210 is slidably provided on the first pushing rod 202, a transmission shaft 211 is provided on the adjusting block 210, a sliding rod 212 is rotatably provided on the driving shaft 209, and the sliding rod 212 is rotatably provided on the transmission shaft 211, as shown in FIG. Figure 3As shown, when the rubber cylinder 104 and the slips 105 make the plug body 1 seal the oil and gas well, the connecting pipe 301 continues to rotate, and the connecting pipe 301 squeezes the second pushing rod 206, so that the second pushing rod 206 moves downward along the guide groove 201, and the driving shaft 209 on the second pushing rod 206 squeezes the sliding rod 212, so that the sliding rod 212 rotates, and the sliding rod 212 drives the transmission shaft 211 to slide together with the adjusting block 210. At this time, the adjusting block 210 drives the pulling block 208 and the transmission cylinder 207 to move synchronously to the left. The left displacement of the transmission cylinder 207 resets the rubber cylinder 104. At this time, the plug body 1 is loosened, and the plug body 1 is pulled out of the oil and gas well by pulling the connecting pipe 301. In this way, when the plug body 1 is pulled out, the damage to the inner wall of the oil and gas well caused by the rubber cylinder 104 and the slips 105 is reduced.

[0052] Furthermore, a protrusion 213 is provided on the pulling block 208. The protrusion 213 is adapted to the sliding cylinder. The protrusion 213 is used to drive the transmission cylinder 207 to move synchronously. When the hydraulic pressure drives the rubber cylinder 104 to expand and press the plug body 1, the rubber cylinder 104 expands and drives the transmission cylinder 207 to move. The transmission cylinder 207 is guided by the protrusion 213 to prevent the transmission cylinder 207 from deflecting.

[0053] Furthermore, the extension portion 302 is adapted to the second push rod 206, as shown in FIG. Figure 2 As shown, the extension portion 302 and the second push rod 206 form a sealed tube, which prevents the hydraulic liquid from entering the cavity formed by the connecting tube 301 and the plug body 1, thereby preventing the hydraulic liquid from driving the second push rod 206 to move toward the center of the central tube 101;

[0054] The plug body 1 can be quickly retracted through the pressure relief mechanism 2 and the connecting mechanism 3, and the damage of the rubber cylinder 104 and the slips 105 to the inner wall of the oil and gas well is reduced during retraction, so that the plug body 1 can continue to be used. At the same time, rapid retraction can save time and improve work efficiency.

[0055] Example 2 further optimizes the hydraulically set bridge plug provided in Example 1. Specifically, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, a strip groove 214 is provided on the push rod 1 202, and the adjustment block 210 is slidably provided on the strip groove 214. A second spring 215 is provided on the strip groove 214. The two ends of the second spring 215 are respectively connected to the corresponding surfaces of the strip groove 214 and the adjustment block 210. The adjustment block 210 is guided by the strip groove 214 to prevent the adjustment block 210 from deflecting during displacement. The elasticity of the second spring 215 can drive the adjustment block 210 to return to its original position.

[0056] Furthermore, the center tube 101 is provided with an offset groove 216, the transmission cylinder 207 is slidably provided on the offset groove 216, and the offset groove 216 is adapted to the push rod 202, as shown in FIG. Figure 3 As shown, when the second push rod 206 moves downward, the second push rod 206 drives the sliding rod 212 to rotate, and the sliding rod 212 drives the adjustment block 210 to slide along the strip groove 214. At the same time, the transmission cylinder 207 moves downward along the offset groove 216. At this time, the adjustment block 210 squeezes the first push rod 202, and the first push rod 202 drives the blocking ring 204 and the ball seat 106 to slide downward. At this time, the pressure relief groove 203 leaks, and the pressure above and below the plug body 1 reaches equilibrium. At this time, the plug body 1 is unsealed;

[0057] Furthermore, a drainage hole 217 is provided on the ball seat 106, and the drainage hole 217 is adapted to the pressure relief groove 203. When the pressure relief groove 203 leaks, the liquid in the oil and gas well quickly enters the central pipe 101 from the drainage groove, accelerating the pressure balance above and below the plug body 1. The ball seat 106 is detachable, and when the sealing ball 108 is not installed, the device can also quickly unseal the plug body 1.

[0058] The use process of the hydraulically set bridge plug provided by the present invention is as follows:

[0059] When in use, the plug body 1 is rotated and fixed on the connecting pipe 301, and the plug body 1 is sent into the oil and gas well. The hydraulic liquid enters the overpressure hole 102 and acts on the sealing piston 103, so that the sealing piston 103 drives the rubber cylinder 104 and the slips 105 to expand and fix the plug body 1 in the oil and gas well. The expansion of the rubber cylinder 104 and the slips 105 seals the oil and gas well. When the plug body 1 needs to be taken out of the oil and gas well, the connecting pipe 301 is continued to be rotated. The connecting pipe 301 squeezes the push rod 206, so that the push rod 206 moves downward along the guide groove 201. The driving shaft 209 on the push rod 206 squeezes the slide rod 212, so that the slide rod 212 rotates. The slide rod 212 drives the transmission shaft 211 to slide together with the adjusting block 210. At this time, the adjusting block 210 drives the pulling block 208 to move synchronously to the left together with the transmission cylinder 207. , the transmission cylinder 207 moves to the left, causing the rubber cylinder 104 to reset. When the rubber cylinder 104 resets, the slips 105 reset one after another, and the slide bar 212 drives the adjustment block 210 to slide along the strip groove 214. At the same time, the transmission cylinder 207 moves downward along the offset groove 216. At this time, the adjustment block 210 squeezes the push rod 202, and the push rod 202 slides downward. The push rod 202 drives the ball seat 106 and the blocking ring 204 to move downward, causing the pressure relief groove 203 to leak, and then the central pipe 101 is connected to the oil and gas well, and the liquid in the oil and gas well enters the central pipe 101, so that the pressure above and below the bottom of the plug body 1 is balanced. In this way, there is no need to take out the sealing ball 108, and the pressure above and below the plug body 1 can also be balanced. At this time, the plug body 1 is loose, and the plug body 1 is pulled out of the oil and gas well by pulling the connecting pipe 301.

[0060] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A hydraulically set bridge plug, comprising a plug body (1), a center tube (101) arranged in the plug body (1), an overpressure hole (102) arranged on the center tube (101), a setting piston (103), a rubber cylinder (104) and a slip (105) arranged outside the center tube (101), a ball seat (106) arranged at the bottom of the center tube (101), a limiting ring (107) arranged in the center tube (101), and a sealing ball (108) arranged in the ball seat (106), characterized in that: It also includes a pressure relief mechanism (2) provided on the plug body (1), and a connecting mechanism (3) provided on the plug body (1); The pressure relief mechanism (2) comprises a guide groove (201) provided in the central tube (101), a push rod (202) slidably provided on the guide groove (201), a pressure relief groove (203) provided in the central tube (101), and a blocking ring (204) slidably provided on the pressure relief groove (203); The connecting mechanism (3) comprises a connecting pipe (301) threadedly connected to the plug body (1), and an extension portion (302) provided on the connecting pipe (301); The pressure relief mechanism (2) includes a spring (205) disposed in the pressure relief groove (203), two ends of the spring (205) being connected to corresponding surfaces of the blocking ring (204) and the pressure relief groove (203), respectively, and the push rod (202) and the ball seat (106) are both disposed on the blocking ring (204); A second push rod (206) is slidably provided on the guide groove (201), and the second push rod (206) is adapted to the connecting pipe (301); A transmission cylinder (207) is slidably provided on the central tube (101), the transmission cylinder (207) is provided on the rubber cylinder (104), and a pulling block (208) is provided in the transmission cylinder (207).

2. The hydraulically set bridge plug according to claim 1, characterized in that: A driving shaft (209) is provided on the second pushing rod (206), an adjusting block (210) is provided on the pulling block (208), the adjusting block (210) is slidably provided on the first pushing rod (202), a transmission shaft (211) is provided on the adjusting block (210), a sliding rod (212) is rotatably provided on the driving shaft (209), and the sliding rod (212) is rotatably provided on the transmission shaft (211).

3. The hydraulically set bridge plug according to claim 2, characterized in that: The pulling block (208) is provided with a protrusion (213), and the protrusion (213) is adapted to the sliding cylinder.

4. The hydraulically set bridge plug according to claim 3, characterized in that: The extension portion (302) is adapted to the second push rod (206).

5. The hydraulically set bridge plug according to claim 4, characterized in that: The push rod (202) is provided with a strip groove (214), the adjustment block (210) is slidably provided on the strip groove (214), a spring (215) is provided on the strip groove (214), and the two ends of the spring (215) are respectively connected to the corresponding surfaces of the strip groove (214) and the adjustment block (210).

6. The hydraulically set bridge plug according to claim 5, characterized in that: The central tube (101) is provided with an offset groove (216), the transmission cylinder (207) is slidably provided on the offset groove (216), and the offset groove (216) is adapted to the first push rod (202).

7. The hydraulically set bridge plug according to claim 6, characterized in that: The ball seat (106) is provided with a drainage hole (217), and the drainage hole (217) is adapted to the pressure relief groove (203).

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