A soluble bridge plug

Abstract

This application discloses a soluble bridge plug, belonging to the field of oil and gas field development technology, which solves the problems of short sealing time and reduced production efficiency of existing soluble bridge plugs. The soluble bridge plug has a salt-resistant and corrosion-resistant coating on its surface. A guide shoe and a mandrel are connected at the ends. An anchoring mechanism is sleeved on the mandrel; when the anchoring mechanism moves towards the guide shoe, it expands radially to anchor the soluble bridge plug. A sealing mechanism is sleeved on the mandrel and expands radially to achieve a seal. A sleeve is disposed within the axial through-hole of the mandrel, and a first cavity for filling with a solid solvent is provided on the sleeve. A sealing plug is connected to the sleeve. One end of a plug is connected to the sealing plug, and the other end is connected to the guide shoe. One end of a release mechanism is connected to the end of the sleeve away from the sealing plug, and the other end extends out of the mandrel. This application not only achieves long-term sealing but also rapid dissolution, thereby improving the production efficiency of oil and gas wells and reducing operating costs.

Description

Technical Field

[0001] This application relates to the field of oil and gas field development technology, and in particular to a soluble bridge plug. Background Technology

[0002] Bridge plugs are conventional tools used in oilfield development to plug wellbores. Through continuous development, bridge plugs have evolved from cast iron drillable bridge plugs and composite drillable bridge plugs to soluble bridge plugs. Soluble bridge plugs completely dissolve after fracturing, relying on wellbore temperature and a certain level of salinity in the fluid environment, ensuring full-bore production. Currently used soluble bridge plugs have a relatively short plugging time. Although there are soluble bridge plugs with longer plugging times, the lack of an effective salt-resistant and corrosion-resistant coating necessitates the use of materials with slow dissolution rates. Such soluble bridge plugs require more than three months to dissolve, severely impacting the normal production of oil and gas wells. Utility Model Content

[0003] This application provides a soluble bridge plug, which solves the problems of short sealing time and reduced production efficiency of existing soluble bridge plugs.

[0004] This utility model provides a soluble bridge plug with a salt-resistant and corrosion-resistant coating on its surface. It includes a mandrel, an anchoring mechanism, a sealing mechanism, a release mechanism, a sleeve, a sealing plug, a stopper, and a guide shoe. The mandrel has an axial through hole. The guide shoe is connected to the end of the mandrel. The anchoring mechanism is sleeved on the mandrel, and when it moves towards the guide shoe, it expands radially to anchor the soluble bridge plug. The sealing mechanism is sleeved on the mandrel and expands radially to achieve a seal. The sleeve is disposed within the axial through hole of the mandrel, and has a first cavity for filling with a solid solvent. The sealing plug is connected to the sleeve and seals the first cavity. One end of the stopper is connected to the sealing plug, and the other end is connected to the guide shoe. One end of the release mechanism is connected to the end of the sleeve opposite to the sealing plug, and the other end extends out of the mandrel to separate the soluble bridge plug from the sealing tool.

[0005] In one possible implementation, the dropping mechanism includes a dropping lever and a dropping shear sleeve; the dropping shear sleeve is located inside the spindle and connected to the end of the sleeve opposite to the sealing plug; the dropping lever and the end of the dropping shear sleeve opposite to the sleeve are connected.

[0006] In one possible implementation, the release lever is provided with an injection hole communicating with the release shear sleeve; the release shear sleeve is made of a fast-dissolving material.

[0007] In one possible implementation, the anchoring mechanism includes a push ring, a first slip, a first cone, a second cone, a second slip, a third slip, and a third cone sequentially fitted onto the mandrel; one end of the first slip abuts against the push ring, and the other end abuts against the conical surface of the first cone, the first slip having a plurality of first slip teeth arranged around its axis; the bottom surface of the first cone abuts against the sealing mechanism; the bottom surface of the second cone abuts against the sealing mechanism, and the conical surface abuts against the second slip, the second slip having a plurality of second slip teeth arranged around its axis, the second slip teeth being opposite in direction to the first slip teeth; one end of the third slip abuts against the end of the second slip opposite to the sealing mechanism, the other end abuts against the conical surface of the third cone, the third slip having a plurality of third slip teeth arranged around its axis, the third slip teeth being opposite in direction to the second slip teeth; the bottom surface of the third cone abuts against the sealing mechanism, and the conical surface abuts against the guide shoe.

[0008] In one possible implementation, the anchoring mechanism further includes a slip guide ring; the slip guide ring is sleeved on the mandrel and located between the second slip and the third slip.

[0009] In one possible implementation, the push ring, the first cone, and the second cone are all connected to the mandrel via a plurality of set screws.

[0010] In one possible implementation, the sealing mechanism includes a rubber sleeve and a leather cup; both the rubber sleeve and the leather cup are fitted onto the mandrel; the rubber sleeve is located between the first cone and the second cone; and the leather cup is located between the third cone and the guide shoe.

[0011] In one possible implementation, the sealing mechanism further includes a shoulder guard and a back ring; both the shoulder guard and the back ring are sleeved on the mandrel; the shoulder guard and the back ring are sequentially disposed between the first cone and the rubber sleeve.

[0012] In one possible implementation, the soluble bridge plug further includes a plurality of anti-abrasion posts; the plurality of anti-abrasion posts are arranged on the guide shoe around the axis of the guide shoe, and the end face of each of the anti-abrasion posts coincides with the outer wall of the guide shoe.

[0013] In one possible implementation, the guide shoe and the end cap are connected by a plurality of shear pins.

[0014] One or more technical solutions provided in the embodiments of this utility model have at least the following technical effects or advantages:

[0015] This utility model provides a soluble bridge plug with a salt-resistant and corrosion-resistant coating on its surface. It includes a mandrel, an anchoring mechanism, a sealing mechanism, a release mechanism, a sleeve, a sealing plug, a plug, and a guide shoe. The mandrel has an axial through hole. The guide shoe is connected to the end of the mandrel. The anchoring mechanism is sleeved on the mandrel; when the anchoring mechanism moves towards the guide shoe, it expands radially to anchor the soluble bridge plug. The sealing mechanism is sleeved on the mandrel and expands radially to achieve a seal. The sleeve is disposed within the axial through hole of the mandrel and has a first cavity for filling with a solid solvent. The sealing plug is connected to the sleeve and seals the first cavity. One end of the plug is connected to the sealing plug, and the other end is connected to the guide shoe. One end of the release mechanism is connected to the end of the sleeve opposite to the sealing plug, and the other end extends out of the mandrel to separate the soluble bridge plug from the sealing tool. In practical use, the soluble bridge plug is connected to the setting tool via coiled tubing or logging cable. When the soluble bridge plug is lowered to the set depth in the wellbore, the setting tool pushes the anchoring and sealing mechanisms towards the guide shoe. This causes the anchoring mechanism to expand radially to anchor the soluble bridge plug, and the sealing mechanism to expand radially to achieve a seal, thus setting the soluble bridge plug. The release mechanism then separates the soluble bridge plug from the setting tool. After the required sealing time is reached, the salt-resistant anti-corrosion coating fails, and pressure is injected from the wellhead to allow the plug to be pumped off the guide shoe. The pumped-off plug then pulls the sealing plug out of the sleeve, opening the first cavity. This allows the solid solvent to contact the wellbore liquid medium, forming a liquid solvent. The liquid solvent then undergoes an electrochemical corrosion reaction with the soluble bridge plug, promoting and accelerating its dissolution. The soluble bridge plug of this application not only achieves long-term sealing but also rapid dissolution, thereby improving oil and gas well production efficiency and reducing operating costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the soluble bridge plug provided in an embodiment of this application;

[0018] Figure 2 A cross-sectional view of the soluble bridge plug provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of the release lever provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure of the drop-off shear sleeve provided in an embodiment of this application.

[0021] Icons: 1-Mandrel; 2-Anchoring mechanism; 21-Push ring; 22-First slip; 221-First slip tooth; 23-First cone; 24-Second cone; 25-Second slip; 251-Second slip tooth; 26-Third slip; 261-Third slip tooth; 27-Third cone; 28-Slipper guide ring; 3-Sealing mechanism; 31-Glue sleeve; 32-Leather cup; 33-Shoulder protector; 34-Back ring; 4-Release mechanism; 41-Release lever; 411-Injection hole; 42-Release shear sleeve; 5-Sleeve; 6-Sealing plug; 7-Plug; 8-Guide shoe; 9-Anti-wear column; 10-Shear pin; 11-Solid accelerator; 12-Set screw; 13-First sealing ring; 14-Second sealing ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They 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 utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" 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; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0024] like Figures 1-4As shown, this embodiment of the invention provides a soluble bridge plug with a salt-resistant and corrosion-resistant coating on its surface. It includes a mandrel 1, an anchoring mechanism 2, a sealing mechanism 3, a release mechanism 4, a sleeve 5, a sealing plug 6, a plug 7, and a guide shoe 8. The mandrel 1 has an axial through hole. The guide shoe 8 is connected to the end of the mandrel 1. The anchoring mechanism 2 is sleeved on the mandrel 1. When the anchoring mechanism 2 moves towards the guide shoe 8, it can expand radially to anchor the soluble bridge plug. The sealing mechanism 3 is sleeved on the mandrel 1 and can expand radially to achieve a seal. Specifically, during the process of lowering the soluble bridge plug into the wellbore, the guide shoe 8 not only prevents the anchoring mechanism 2 and the sealing mechanism 3 on the mandrel 1 from slipping off, but also prevents the anchoring mechanism 2 and the sealing mechanism 3 from wearing out. When the soluble bridge plug is in a wellbore liquid environment, the salt-resistant and corrosion-resistant coating can effectively isolate the wellbore liquid from contact with the soluble material, allowing the soluble bridge plug to achieve a longer sealing time.

[0025] like Figure 2 As shown, the sleeve 5 is disposed in the axial through hole of the mandrel 1, and the sleeve 5 has a first cavity for filling the solid solvent 11. The solid solvent 11 is filled in the first cavity of the sleeve 5. The material of the soluble bridge plug does not react with the solid solvent 11. Only when the solid solvent 11 dissolves in water can the soluble material undergo an electrochemical corrosion reaction (dissolution reaction). The sleeve 5 is provided with threads for connection with the release mechanism 4.

[0026] In this embodiment, the sealing plug 6 and the sleeve 5 are connected to seal the first cavity. One end of the plug 7 is connected to the sealing plug 6, and the other end is connected to the guide shoe 8. One end of the release mechanism 4 is connected to the end of the sleeve 5 away from the sealing plug 6, and the other end extends out of the mandrel 1 to separate the soluble bridge plug from the setting tool. In actual use, the soluble bridge plug is connected to the setting tool via coiled tubing or logging cable. When the soluble bridge plug is lowered to the set depth in the wellbore, the setting tool pushes the anchoring mechanism 2 and the sealing mechanism 3 to move closer to the guide shoe 8, so that the anchoring mechanism 2 expands radially to anchor the soluble bridge plug, and the sealing mechanism 3 expands radially to achieve a seal, thereby achieving the setting of the soluble bridge plug. Then, the soluble bridge plug is separated from the setting tool by operating the release mechanism 4. After the required sealing time is reached, the salt-resistant protective... When the corrosion coating fails, pressure is injected from the wellhead to allow the plug 7 to be pumped off the guide shoe 8. After the plug 7 is pumped off, it causes the sealing plug 6 to dislodge from the sleeve 5, opening the first cavity. This allows the solid solvent 11 to contact the wellbore liquid medium, forming a liquid solvent. The liquid solvent then undergoes an electrochemical corrosion reaction with the soluble bridge plug, promoting and accelerating its dissolution. Once the soluble bridge plug is completely dissolved, the wellbore remains unobstructed throughout its full diameter, making it suitable for wellhead repairs or replacements, and for running production tubing without pressurization. The soluble bridge plug of this application not only provides long-term sealing but also dissolves rapidly, thereby improving oil and gas well production efficiency and reducing operating costs.

[0027] This utility model provides a soluble bridge plug with a salt-resistant and corrosion-resistant coating on its surface. It includes a mandrel 1, an anchoring mechanism 2, a sealing mechanism 3, a release mechanism 4, a sleeve 5, a sealing plug 6, a plug 7, and a guide shoe 8. The mandrel 1 has an axial through hole. The guide shoe 8 is connected to the end of the mandrel 1. The anchoring mechanism 2 is sleeved on the mandrel 1. When the anchoring mechanism 2 moves towards the guide shoe 8, it can expand radially to anchor the soluble bridge plug. The sealing mechanism 3 is sleeved on the mandrel 1 and can expand radially to achieve a seal. The sleeve 5 is disposed within the axial through hole of the mandrel 1, and has a first cavity for filling with a solid solvent 11. The sealing plug 6 is connected to the sleeve 5 to seal the first cavity. One end of the plug 7 is connected to the sealing plug 6, and the other end is connected to the guide shoe 8. One end of the release mechanism 4 is connected to the end of the sleeve 5 opposite to the sealing plug 6, and the other end extends out of the mandrel 1 to separate the soluble bridge plug from the sealing tool. In actual use, the soluble bridge plug is connected to the setting tool via coiled tubing or logging cable. When the soluble bridge plug is lowered to the set depth in the wellbore, the setting tool pushes the anchoring mechanism 2 and the sealing mechanism 3 to move closer to the guide shoe 8, so that the anchoring mechanism 2 expands radially to anchor the soluble bridge plug and the sealing mechanism 3 expands radially to achieve sealing, thereby achieving the setting of the soluble bridge plug. Then, the soluble bridge plug is separated from the setting tool by operating the release mechanism 4. When the required sealing time is reached, the salt-resistant anti-corrosion coating fails, and pressure is injected from the wellhead to allow the plug 7 to be pumped off from the guide shoe 8. After the plug 7 is pumped off, it drives the sealing plug 6 to be released from the sleeve 5, thereby opening the first cavity, so that the solid solvent 11 comes into contact with the wellbore liquid medium to form a liquid solvent. The liquid solvent reacts with the soluble bridge plug in an electrochemical corrosion reaction to promote and accelerate the dissolution of the soluble bridge plug. The soluble bridge plug of this application can not only achieve long-term sealing, but also dissolve quickly, thereby improving the production efficiency of oil and gas wells and reducing operating costs.

[0028] like Figure 2 As shown, the release mechanism 4 includes a release lever 41 and a release shear sleeve 42. The release shear sleeve 42 is located inside the spindle 1 and is connected to one end of the sleeve 5 away from the sealing plug 6. The release lever 41 and the end of the release shear sleeve 42 away from the sleeve 5 are connected. Specifically, after the soluble bridge plug is seated, the release lever 41 pulls off the release shear sleeve 42, separating the seating tool from the soluble bridge plug. The structure is simple and the separation efficiency is high.

[0029] In this embodiment, the release lever 41 is provided with an injection hole 411 communicating with the release shear sleeve 42. The release shear sleeve 42 is made of a fast-dissolving material. Specifically, when the soluble bridge plug sets prematurely, i.e., when the setting tool cannot provide sufficient setting force, resulting in the release shear sleeve 42 failing to break, a high-concentration potassium chloride solution is pumped into the wellhead. The high-concentration potassium chloride solution then enters the release shear sleeve 42 through the injection hole 411, causing the release shear sleeve 42 to dissolve rapidly, thereby quickly separating the setting tool from the soluble bridge plug.

[0030] like Figure 1 As shown, the anchoring mechanism 2 includes a push ring 21, a first slip 22, a first cone 23, a second cone 24, a second slip 25, a third slip 26, and a third cone 27, which are sequentially fitted onto the mandrel 1. One end of the first slip 22 abuts against the push ring 21, and the other end abuts against the conical surface of the first cone 23. The first slip 22 has multiple first slip teeth 221 arranged around its axis. The bottom surface of the first cone 23 abuts against the sealing mechanism 3. The bottom surface of the second cone 24 abuts against the sealing mechanism 3, and the conical surface abuts against the second slip 25. The second slip 25 has multiple second slip teeth 251 arranged around its axis, and the second slip teeth 251 are in the opposite direction to the first slip teeth 221. One end of the third slip 26 abuts against one end of the second slip 25 away from the sealing mechanism 3, and the other end abuts against the conical surface of the third cone 27. The third slip 26 is provided with a plurality of third slip teeth 261 arranged around its axis, and the third slip teeth 261 and the second slip teeth 251 are in opposite directions. The bottom surface of the third cone 27 abuts against the sealing mechanism 3, and the conical surface abuts against the guide shoe 8. Specifically, when the soluble bridge plug is lowered into the wellbore to the set depth, the setting tool pushes the push ring 21 to move closer to the guide shoe 8. The movement of the push ring 21 pushes the first slip 22 and the first cone 23 to move. The first cone pushes the second cone 24, the second slip 25, the third slip 26 and the third cone 27 to move. During the movement of the first slip 22, the second slip 25 and the third slip 26, they respectively expand radially along the conical surface of the corresponding first cone 23, second cone 24 and third cone 27 and split into six petals. The first slip tooth 221, the second slip tooth 251 and the third slip tooth 261 bite and embed into the inner wall of the wellbore casing to complete the anchoring operation.

[0031] Continue to refer to Figure 1 As shown, the anchoring mechanism 2 also includes a slip guide ring 28. The slip guide ring 28 is sleeved on the mandrel 1 and located between the second slip 25 and the third slip 26. Specifically, the slip guide ring 28 enables the second slip 25 and the third slip 26 to spread out evenly, so as to ensure that the anchoring force of the second slip 25 and the third slip 26 is more uniform.

[0032] In practical applications, the push ring 21, the first cone 23, and the second cone 24 are all connected to the mandrel 1 via multiple set screws 12. Specifically, the set screws 12 secure the push ring 21, the first cone 23, and the second cone 24 to prevent premature setting of the soluble bridge plug due to encountering steps or impacts. Furthermore, the set screws 12 are made of copper.

[0033] like Figure 1 As shown, the sealing mechanism 3 includes a rubber sleeve 31 and a cup 32. Both the rubber sleeve 31 and the cup 32 are fitted onto the mandrel 1. The rubber sleeve 31 is located between the first cone 23 and the second cone 24. The cup 32 is located between the third cone 27 and the guide shoe 8. After the soluble bridge plug is seated, the rubber sleeve 31 and the cup 32 can provide a double seal to isolate the second slip 25 and the third slip 26 from the wellbore fluid, thereby protecting the second slip 25 and the third slip 26. In addition, even if the first slip 22 accidentally dissolves and fails, the second slip teeth 251 and the third slip teeth 261 are in opposite directions and can withstand axial forces in both directions. Under the double sealing protection of the rubber sleeve 31 and the cup 32, the sealing and anchoring pressure bearing functions of the soluble bridge plug are more stable and reliable.

[0034] like Figure 2 As shown, the sealing mechanism 3 also includes a shoulder 33 and a back ring 34. Both the shoulder 33 and the back ring 34 are sleeved on the mandrel 1. The shoulder 33 and the back ring 34 are sequentially arranged between the first cone 23 and the rubber sleeve 31. Specifically, the shoulder 33 and the back ring 34 can provide support after the rubber sleeve 31 is compressed.

[0035] Continue to refer to Figure 1 As shown, the soluble bridge plug also includes multiple anti-wear posts 9. These anti-wear posts 9 are arranged around the axis of the guide shoe 8, and the end face of each anti-wear post 9 coincides with the outer wall of the guide shoe 8. Specifically, the anti-wear posts 9 can protect the guide shoe 8 during the process of lowering the soluble bridge plug into the wellbore, thereby preventing the guide shoe 8 from wearing out and failing.

[0036] In practical applications, the guide shoe 8 and the plug 7 are connected by multiple shear pins 10. Specifically, when the plug 7 is pumped out, the shear pins 10 are sheared off by the pumping force of the plug 7.

[0037] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0038] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A soluble bridge plug, characterized in that, Its surface is provided with a salt-resistant and corrosion-resistant coating, including a mandrel (1), an anchoring mechanism (2), a sealing mechanism (3), a release mechanism (4), a sleeve (5), a sealing plug (6), a plug (7), and a guide shoe (8); The mandrel (1) has an axial through hole; The guide shoe (8) and the mandrel (1) are connected at the ends; The anchoring mechanism (2) is sleeved on the mandrel (1). When the anchoring mechanism (2) moves toward the guide shoe (8), the anchoring mechanism (2) can expand radially to anchor the soluble bridge plug. The sealing mechanism (3) is sleeved on the mandrel (1) and can expand radially to achieve a seal; The sleeve (5) is disposed in the axial through hole of the mandrel (1), and the sleeve (5) has a first cavity for filling solid solvent (11); The sealing plug (6) and the sleeve (5) are connected to seal the first cavity; One end of the plug (7) is connected to the sealing plug (6), and the other end is connected to the guide shoe (8); One end of the release mechanism (4) is connected to the end of the sleeve (5) away from the sealing plug (6), and the other end extends out of the mandrel (1) for separating the soluble bridge plug from the sealing tool.

2. The soluble bridge plug according to claim 1, characterized in that, The dropping mechanism (4) includes a dropping lever (41) and a dropping shear sleeve (42). The drop-off shear sleeve (42) is located inside the spindle (1) and is connected to the end of the sleeve (5) that is away from the sealing plug (6); The end of the release lever (41) and the release shear sleeve (42) opposite to the sleeve (5) are connected.

3. The soluble bridge plug according to claim 2, characterized in that, The release lever (41) is provided with an injection hole (411) that communicates with the release shear sleeve (42). The material of the drop-off shear sleeve (42) is a fast-dissolving material.

4. The soluble bridge plug according to claim 1, characterized in that, The anchoring mechanism (2) includes a push ring (21), a first slip (22), a first cone (23), a second cone (24), a second slip (25), a third slip (26), and a third cone (27) sequentially sleeved on the spindle (1). One end of the first slip (22) abuts against the push ring (21), and the other end abuts against the conical surface of the first cone (23). The first slip (22) is provided with a plurality of first slip teeth (221) arranged around its axis. The bottom surface of the first cone (23) abuts against the sealing mechanism (3); The bottom surface of the second cone (24) abuts against the sealing mechanism (3), and the cone surface abuts against the second slip (25). The second slip (25) is provided with a plurality of second slip teeth (251) arranged around its axis. The direction of the second slip teeth (251) is opposite to that of the first slip teeth (221). One end of the third slip (26) abuts against the end of the second slip (25) away from the sealing mechanism (3), and the other end abuts against the conical surface of the third cone (27). The third slip (26) is provided with a plurality of third slip teeth (261) arranged around its axis. The direction of the third slip teeth (261) is opposite to that of the second slip teeth (251). The bottom surface of the third cone (27) abuts against the sealing mechanism (3), and the cone surface abuts against the guide shoe (8).

5. The soluble bridge plug according to claim 4, characterized in that, The anchoring mechanism (2) also includes a guide ring (28); The slip guide ring (28) is sleeved on the mandrel (1) and is located between the second slip (25) and the third slip (26).

6. The soluble bridge plug according to claim 4, characterized in that, The push ring (21), the first cone (23), and the second cone (24) are all connected to the spindle (1) by a plurality of set screws (12).

7. The soluble bridge plug according to claim 4, characterized in that, The sealing mechanism (3) includes a rubber tube (31) and a leather cup (32); The rubber tube (31) and the leather cup (32) are both sleeved on the mandrel (1). The rubber sleeve (31) is located between the first cone (23) and the second cone (24); The leather cup (32) is located between the third cone (27) and the shoe (8).

8. The soluble bridge plug according to claim 7, characterized in that, The sealing mechanism (3) also includes shoulder pads (33) and back rings (34); The shoulder pads (33) and the back ring (34) are both fitted onto the spindle (1). The shoulder pad (33) and the back ring (34) are sequentially disposed between the first cone (23) and the rubber tube (31).

9. The soluble bridge plug according to claim 1, characterized in that, It also includes multiple anti-wear pillars (9); Multiple anti-abrasion posts (9) are arranged on the guide shoe (8) around the axis of the guide shoe (8), and the end face of each anti-abrasion post (9) coincides with the outer wall of the guide shoe (8).

10. The soluble bridge plug according to claim 1, characterized in that, The guide shoe (8) and the plug (7) are connected by a plurality of shear pins (10).

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