A dissolvable bridge plug

Abstract

This invention proposes a soluble bridge plug, belonging to the field of bridge plugs. To address the problems of poor setting effect and low efficiency of existing bridge plugs, it includes a mandrel, a sealing sleeve, an anchoring assembly, and a setting mechanism. The sealing sleeve is slidably fitted onto the mandrel. In the anchoring assembly, a first slip, a first cone, a second cone, and a second slip are sequentially slidably fitted onto the mandrel. The sealing sleeve is located between the first and second cones. The first slip can slide along the outer wall of the first cone and be opened by it; the second slip can slide along the outer wall of the second cone and be opened by it. A pressure cap is fitted onto the mandrel. The mandrel, first slip, second slip, first cone, second pusher, and sealing sleeve are all made of a soluble material. In the setting mechanism, a central shaft is connected to the mandrel, and the pressure cap, second pusher, first pusher, and pressure-transmitting piston sequentially abut against each other. The pressure-transmitting piston is located between the propellant charge and the first pusher. The setting method is simple and reliable, and can also reduce costs and improve efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of bridge plug technology, and in particular relates to a soluble bridge plug. Background Technology

[0002] In the shale oil well development process, horizontal section completion technology plays a crucial role in improving recovery rates. Traditional bridge plugs are mostly made of metal, and due to their insolubility after operation, they need to be removed by milling. This not only consumes a lot of time, manpower, and resources, but the milling debris can also easily damage downhole equipment and the wellbore, seriously hindering the continuity and efficiency of production operations. Moreover, the installation and setting of traditional bridge plugs are complex, greatly affected by environmental and human factors, and the setting effect is not stable. With the continuous innovation of shale oil extraction technology, advanced technologies such as cluster-based directional perforation, post-perforation simultaneous fracturing completion, explosive setting, and bridge-perforation coupling have gradually become the industry mainstream. However, traditional bridge plugs cannot meet the requirements of coordinated operation of these technologies. At the same time, the industry's requirements for environmental protection and production efficiency are becoming increasingly stringent. Therefore, there is an urgent need for a new type of soluble bridge plug. Utility Model Content

[0003] In view of this, in order to solve the above problems, this utility model proposes a soluble bridge plug.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A soluble bridge plug, comprising:

[0006] mandrel;

[0007] A sealing rubber sleeve is slidably fitted onto the mandrel.

[0008] An anchoring assembly includes a first slip, a second slip, a first cone, a second cone, a first pin, a second pin, a pressure cap, and a third pin. The first slip, the first cone, the second cone, and the second slip are sequentially slidably fitted onto the mandrel. A sealing sleeve is located between the first cone and the second cone. The small end of the first cone faces the first slip, and the first slip can slide along the outer wall of the first cone and be opened by the first cone. The small end of the second cone faces the second slip, and the second slip can slide along the outer wall of the second cone and be opened by the second cone. The first pin passes through the first cone and the mandrel, the second pin passes through the second cone and the mandrel, the pressure cap is fitted onto the mandrel, and the third pin passes through the pressure cap and the mandrel. The pressure cap abuts against the first slip, and the second slip abuts against the abutment platform on the mandrel. The mandrel, the first slip, the second slip, the first cone, the second pusher, and the sealing sleeve are all made of a soluble material.

[0009] The setting mechanism includes a setting shell, a flame column, a pressure transmitting piston, a first pusher, a second pusher, and a central shaft. One end of the central shaft is connected to the mandrel. The first and second pushers are slidably sleeved on the central shaft. The pressure cap, the second pusher, the first pusher, and the pressure transmitting piston abut against each other in sequence. The pressure transmitting piston slidably passes through the setting shell and is located between the gunpowder column and the first pusher.

[0010] As a preferred embodiment of the aforementioned soluble bridge plug, the anchoring assembly further includes a first pad and a second pad, both of which are sleeved on the mandrel. The first pad is located between the first cone and the sealing sleeve, and the second pad is located between the second cone and the sealing sleeve.

[0011] As a preferred embodiment of the aforementioned soluble bridge plug, a support ring is provided between the sealing rubber sleeve and the mandrel.

[0012] As a preferred embodiment of the aforementioned soluble bridge plug, the soluble bridge plug further includes an igniter connected to the setting housing.

[0013] As a preferred embodiment of the aforementioned soluble bridge plug, the soluble bridge plug further includes a cluster-oriented perforation device, which is connected to the igniter.

[0014] As a preferred embodiment of the aforementioned soluble bridge plug, a first sealing structure is provided between the igniter and the setting housing, and a second sealing structure is provided between the igniter and the perforating gun.

[0015] As a preferred embodiment of the aforementioned soluble bridge plug, both the outer walls of the first and second slips are provided with anti-slip teeth.

[0016] As a preferred embodiment of the aforementioned soluble bridge plug, the sealing sleeve is made of soluble rubber material.

[0017] As a preferred embodiment of the aforementioned soluble bridge plug, the mandrel is made of magnesium-aluminum alloy.

[0018] As a preferred embodiment of the aforementioned soluble bridge plug, the first cone, the first slip, the second cone, and the second slip are all made of soluble metal material.

[0019] Compared with the prior art, the beneficial effects of the soluble bridge plug provided by this utility model are:

[0020] This invention provides a soluble bridge plug, in which the mandrel, first slip, second slip, first cone, second pusher, and sealing sleeve are all made of soluble materials. After the completion of the horizontal section of a shale oil well, it gradually dissolves in the well fluid environment, completely eliminating the need for milling operations, significantly shortening well workover time, reducing manpower and the use of related milling equipment, and significantly lowering the cost of shale oil well extraction. Furthermore, it effectively avoids wear and damage to downhole equipment such as tubing, sucker rods, and downhole pumps caused by milling debris, extending equipment lifespan and reducing equipment maintenance and replacement costs. The dissolution products of the soluble material do not pollute the downhole environment or formation, fully complying with the current stringent environmental protection requirements of the oil extraction industry, and contributing to the achievement of green extraction goals for shale oil wells.

[0021] The simple and reliable setting method simplifies and enhances the processes of bridge plug setting, perforation, and fracturing, significantly improving the efficiency of shale oil well production and reducing the risk of human error. The pump-assisted insertion method also simplifies the well entry process and improves operational efficiency.

[0022] Designed and manufactured strictly in accordance with the SY / T5106-2019 standard, ensuring product quality and performance reliability, and facilitating its promotion and application in the shale oil extraction industry. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0024] Figure 1 This is a schematic diagram of the first part of the soluble bridge plug provided in a specific embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the second part of the soluble bridge plug provided in a specific embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the third part of the soluble bridge plug provided in a specific embodiment of this utility model.

[0027] In the picture:

[0028] 1. Mandrel; 101. Abutment platform; 2. Sealing sleeve; 31. First slip; 32. First cone; 33. First pin; 34. Second slip; 35. Second cone; 36. Second pin; 4. Pressure cap; 5. Third pin; 6. First gasket; 7. Second gasket; 8. Support ring; 9. Powder cartridge; 10. Setting shell; 11. Pressure piston; 12. First pusher; 13. Second pusher; 14. Ignition device; 15. Cluster internal directional perforation device. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] See Figure 1-3This invention provides a soluble bridge plug, comprising a mandrel 1, a sealing sleeve 2, an anchoring assembly, and a setting mechanism. The sealing sleeve 2 is slidably fitted onto the mandrel 1. The anchoring assembly includes a first slip 31, a second slip 34, a first cone 32, a second cone 35, a first pin 33, a second pin 36, a pressure cap 4, and a third pin 5. The first slip 31, the first cone 32, the second cone 35, and the second slip 34 are slidably fitted onto the mandrel 1 in sequence. The sealing sleeve 2 is located between the first cone 32 and the second cone 35. The small end of the first cone 32 faces the first slip 31, and the first slip 31 can slide along the outer wall of the first cone 32 and be opened by the first cone 32. The small end of the second cone 35 faces the second slip 34, and the second slip 34 can slide along the outer wall of the second cone 35 and be opened by the second cone 35. The first pin 33 passes through... The first cone 32 and the mandrel 1 are connected; the second pin 36 passes through the second cone 35 and the mandrel 1; the pressure cap 4 is fitted onto the mandrel 1; and the third pin 5 passes through the pressure cap 4 and the mandrel 1. The pressure cap 4 abuts against the first slip 31, and the second slip 34 abuts against the abutment platform 101 on the mandrel 1. The mandrel 1, the first slip 31, the second slip 34, the first cone 32, the second push cylinder 13, and the sealing sleeve 2 are all made of soluble materials. (Seating machine) The structure includes a setting shell 10, a flame column, a pressure transmitting piston 11, a first pusher 12, a second pusher 13, and a central shaft. The central shaft is connected to one end of the spindle 1. The first pusher 12 and the second pusher 13 are both slidably sleeved on the central shaft. The pressure cap 4, the second pusher 13, the first pusher 12, and the pressure transmitting piston 11 abut against each other in sequence. The pressure transmitting piston 11 is slidably inserted through the setting shell 10 and is located between the gunpowder column 9 and the first pusher 12.

[0034] When the soluble bridge plug is in operation, the propellant column 9 is ignited, generating high-temperature, high-pressure gas that pushes the pressure-transmitting piston 11. The pressure-transmitting piston 11 pushes the first pusher cylinder 12, the first pusher cylinder 12 pushes the second pusher cylinder 13, the second pusher cylinder 13 pushes the pressure cap 4, and the pressure cap 4 continues to push the first slip 31. The first pin 33 is sheared off, and the first slip 31 slides along the first cone 32 and is pushed open. Then, the first cone 32 is also pushed, and the sealing sleeve 2, the second cone 35, and the second slip 34 are pushed in sequence. The second pin 36 is sheared off, and the second slip 34 slides along the second cone 35 and is pushed open. The sealing sleeve 2 expands radially due to axial compression. Thus, the radial dimensions of the first slip 31, the second slip 34, and the sealing sleeve 2 increase, firmly embedding into the inner wall of the sleeve. The sealing sleeve 2 can also fill the gap between the bridge plug and the casing, achieving reliable setting and effectively isolating fluids inside and outside the wellbore after setting. The mandrel 1, first slip 31, second slip 34, first cone 32, second pusher 13, and sealing sleeve 2 are all made of soluble materials. After the completion of the horizontal section of the shale oil well, they can gradually dissolve in the well fluid environment, completely eliminating the need for milling operations, significantly reducing extraction costs, and effectively minimizing damage to downhole equipment. Simultaneously, the structure and setting method of the bridge plug are optimized to ensure close cooperation in processes such as directional perforation within the cluster, simultaneous fracturing after perforation, explosive setting, and bridge-perforation coupling, ensuring simple and reliable installation and setting, and significantly improving the efficiency of shale oil well production operations.

[0035] Optionally, the anchoring assembly further includes a first pad 6 and a second pad 7, both of which are sleeved on the spindle 1. The first pad 6 is located between the first cone 32 and the sealing sleeve 2, and the second pad 7 is located between the second cone 35 and the sealing sleeve 2.

[0036] Specifically, the sealing sleeve 2 is made of soluble rubber material. Optionally, a support ring 8 is provided between the sealing sleeve 2 and the mandrel 1. The support ring 8 is also made of soluble material. The sealing sleeve 2 can be completely dissolved in the well fluid, meeting the requirements for sealing performance and dissolution characteristics in the SY / T5106-2019 standard. It has excellent flexibility and sealing performance, and after setting, it can effectively isolate the fluids inside and outside the wellbore and resist the high-pressure impact of shale oil fracturing fluid. The support ring 8 provides a stable structural support for the sealing sleeve 2, preventing it from deforming under high pressure, ensuring the durability of the sealing effect, and ensuring that the fracturing fluid will not leak during fracturing operations.

[0037] Specifically, the mandrel 1 is made of magnesium-aluminum alloy. It is made of high-strength magnesium-aluminum alloy, selected strictly according to the SY / T5106-2019 standard. This material meets the stringent strength requirements of complex downhole conditions in shale oil wells while possessing good solubility, allowing it to gradually dissolve in the well fluid environment. The mandrel 1 is carefully internally designed with pre-reserved wiring for the cluster-oriented perforation device 15, fracturing fluid delivery channels for simultaneous fracturing operations after perforation, and interfaces for connection with the perforation device during bridge-perforation coupling. This ensures stable electrical connections, smooth fracturing fluid delivery, and stable collaborative operation with the perforation device in each process stage.

[0038] Optionally, the outer walls of both the first slip 31 and the second slip 34 are provided with anti-slip teeth. The slip surfaces are designed with unique anti-slip teeth, which, during setting, ensure that the radially opening first slip 31 and the second slip 34 are firmly embedded in the inner wall of the casing, preventing displacement of the bridge plug during operation. In conditions such as clustered directional perforation, post-perforation synchronous fracturing, and bridge-perforation couplings, the anchoring assembly can withstand the instantaneous strong impact force, ensuring the stability of the bridge plug position and meeting the standard requirements for anchoring reliability.

[0039] Specifically, the first cone 32, the first slip 31, the second cone 35, and the second slip 34 are all made of soluble metal materials. The materials of each component of the soluble bridge plug are specially designed. The magnesium-aluminum alloy of the mandrel 1 and the soluble rubber of the sealing sleeve 2 can dissolve at a predetermined rate and time in the well fluid environment commonly found in shale oil wells. When the composition of the well fluid is similar to that of the hydrochloric acid solution, the sealing sleeve 2 can completely dissolve within 5-6 hours. The mandrel 1 and other soluble components completely dissolve within several days to several weeks after the completion of the simultaneous fracturing operation following perforation. Furthermore, the dissolution products do not pollute the downhole environment, meeting the environmental performance requirements of the SY / T5106-2019 standard.

[0040] Optionally, the soluble bridge plug further includes an igniter 14, which is connected to the setting housing 10. The soluble bridge plug also includes a cluster-oriented perforation device 15, which is connected to the igniter 14.

[0041] The cluster-based directional perforation device 15 integrates a rotatable perforating gun and a high-precision directional control system. The perforating gun can rotate within the cluster according to a preset program, achieving directional perforation at different angles. The directional control system receives signals transmitted from the ground and precisely controls the rotation angle and perforation timing of the perforating gun. Using sensors such as gyroscopes and electronic compasses, the device monitors the azimuth and angle of the perforating gun in real time, ensuring accurate perforation direction and meeting the perforation accuracy requirements of the SY / T5106-2019 standard. Targeting the geological characteristics of horizontal sections of shale oil wells, this device optimizes perforation parameters and angles, enabling more precise opening of perforation channels in shale formations and improving shale oil extraction efficiency.

[0042] A dedicated igniter 14 is meticulously designed at the top of the bridge plug. The igniter 14 serves both to connect the cluster-internal directional perforation device 15 and the setting housing 10, and to ignite the propellant charge 9. The igniter 14, through a high-precision threaded connection or quick-lock connection, allows for rapid and stable installation of the perforation gun, meeting the standard requirements for the strength and stability of the connection structure and satisfying the requirements of the bridge-perforation coupling process. The igniter 14 features a cleverly designed wire guide groove to comprehensively protect the perforation gun wire, preventing damage during bridge plug insertion and setting. The bottom of the bridge plug has a connection interface for the fracturing tubing, ensuring that fracturing fluid can smoothly pass through the bridge plug into the target formation during simultaneous fracturing operations after perforation. A sealing device is provided at the interface to prevent fracturing fluid leakage.

[0043] Optionally, a first sealing structure is provided between the igniter 14 and the setting housing 10, and a second sealing structure is provided between the igniter 14 and the perforation gun. This effectively prevents fluid from entering the perforation device from inside the wellbore.

[0044] The soluble bridge plug is installed in the well using a pumping method, where it is lowered into the well along with related equipment. During pumping, the bridge plug and auxiliary equipment are propelled by high-pressure fluid along the tubing to the predetermined position in the horizontal section of the shale oil well. During pumping, all components of the soluble bridge plug are in a safe locked state to prevent malfunctions during delivery. When setting is required, the first pin 33, the second pin 36, and the third pin 5 are all sheared off.

[0045] Specific working methods:

[0046] (1) Assembly of the bridge plug, perforation, and fracturing equipment: On the ground, strictly follow the operating procedures to accurately install the cluster-oriented perforation device 15 and the perforation gun onto the igniter 14 on top of the Y453 soluble bridge plug, ensuring a firm connection and accurate positioning. Simultaneously, route the wires and signal transmission lines of the perforation device through the internal channel of the mandrel 1, and take sealing and protective measures to prevent damage to the lines and fluid intrusion. Connect the bottom of the bridge plug to the fracturing string through the connection interface, ensuring a good seal and unobstructed fracturing fluid delivery channel, meeting the assembly process requirements in the SY / T5106-2019 standard. Install the propellant setting device at the designated position on the bridge plug, connect the pressure transmission channel and ignition line, and ensure the equipment is in a safe and ready-to-launch state.

[0047] (2) Bridge plug installation (pumping process): Connect the assembled bridge plug and related equipment to the pumping string, and inject high-pressure fluid into the tubing through the surface pumping equipment. Driven by the high-pressure fluid, the bridge plug and auxiliary equipment move slowly and smoothly along the tubing to the predetermined position in the horizontal section of the shale oil well. During the pumping process, parameters such as pumping pressure and flow rate are monitored in real time to ensure the safety and stability of the pumping process. When the bridge plug reaches the predetermined position, pumping is stopped, and preparation is made for the setting operation.

[0048] (3) Setting, perforation and fracturing operations: The igniter 14 remotely ignites the gunpowder column 9 via ground control equipment. The high-temperature and high-pressure gas generated by the combustion of the gunpowder pushes the pressure transmission piston 11 to move. The pressure transmission piston 11 sequentially drives the first pusher 12, the second pusher 13, the pressure cap 4, the first slip 31, the first cone 32, the sealing rubber sleeve 2, the second cone 35 and the second slip 34. The first slip 31 slides along the first cone 32 and is opened, and the second slip 34 slides along the second cone 35 and is opened. The sealing rubber sleeve 2 expands radially due to axial compression. Thus, the radial dimensions of the first slip 31, the second slip 34 and the sealing rubber sleeve 2 increase and they are firmly embedded in the inner wall of the sleeve. The sealing rubber sleeve 2 can also fill the gap between the bridge plug and the sleeve, achieving reliable setting. After setting is completed, the ground control system sends a signal to the cluster-oriented perforation device 15 to start the directional perforation operation. The perforation unit rotates within its cluster according to a preset program, perforating at predetermined angles and in a set sequence. Immediately after perforation, fracturing fluid is injected into the target formation through the fracturing tubing string for simultaneous fracturing operations. During fracturing operations, parameters such as wellhead pressure and flow rate are monitored in real time to ensure smooth operation. The operation strictly adheres to the setting, perforation, and fracturing procedures and parameter control requirements outlined in the SY / T5106-2019 standard, while also adjusting operational parameters in real time based on the characteristics of the horizontal sections of shale oil wells.

[0049] (4) Dissolution Process: After the successful completion of the perforation and simultaneous fracturing operation, the well fluid in the shale oil wellbore at the location of the bridge plug rapidly reacts chemically with the soluble material of the bridge plug. The sealing sleeve 2 dissolves completely within 5-6 hours, while other soluble components such as the mandrel 1 and anchoring assembly gradually dissolve over several days to weeks. During the dissolution process, advanced equipment such as pressure sensors and flow sensors installed at the wellhead, as well as temperature sensors and chemical sensors installed downhole, are used to monitor parameters such as pressure and flow at the wellhead, as well as data such as temperature and chemical solution composition downhole. Based on the monitoring data, the flow state of the well fluid is flexibly adjusted or an appropriate amount of dissolution-promoting agent is added through the surface intelligent control system to achieve precise control over the dissolution rate and process, ensuring that the dissolution process is carried out safely and efficiently, in accordance with the monitoring and safety requirements for the bridge plug dissolution process in the SY / T5106-2019 standard.

[0050] Inspection and testing methods:

[0051] (1) Material Inspection: In accordance with the SY / T5106-2019 standard, chemical composition analysis and mechanical property tests were conducted on the materials used in various components, such as the magnesium-aluminum alloy of the mandrel 1 and the soluble rubber of the sealing sleeve 2, to ensure that the materials meet the design requirements and standard specifications. For the special working conditions of shale oil wells, the corrosion resistance and wear resistance of the materials were given special attention, and the solubility characteristics of the sealing sleeve 2 in hydrochloric acid solution were also tested to ensure they met the design requirements.

[0052] (2) Sealing performance test: The bridge plug is installed in the simulated shale oil wellbore device, and the sealing performance is tested according to the pressure and temperature conditions specified in the standard. The sealing effect of the sealing sleeve 2 is checked to ensure that there is no leakage. Considering the high pressure characteristics of shale oil fracturing operations, the pressure standard for the sealing performance test is appropriately increased.

[0053] (3) Anchoring performance test: Under simulated downhole conditions of shale oil wells, a loading test was conducted on the anchoring components of the bridge plug to test the anchoring force of the slips to the inner wall of the casing, ensuring that the anchoring strength requirements specified in the standard are met. Considering the stress characteristics of the horizontal section of the casing in shale oil wells, loads in different directions were simulated to verify the reliability of the anchoring components.

[0054] (4) Setting and Unsetting Tests: By simulating the actual operation of shale oil wells, multiple setting and unsetting tests were conducted on the gunpowder setting device of the bridge plug to check the reliability and stability of setting and unsetting, ensuring compliance with the specifications for setting and unsetting performance in the standard. The focus was on testing the success rate and ease of operation of setting and unsetting in the complex environment of shale oil wells.

[0055] (5) Perforation accuracy test: In a simulated shale oil wellbore environment, the perforation accuracy of the cluster-based directional perforation device 15 was tested to check the accuracy of the rotation angle of the perforation gun and the perforation position, ensuring that the perforation accuracy requirements in the SY / T5106-2019 standard are met. Based on the geological characteristics of the shale oil layer, the perforation accuracy test indicators were adjusted accordingly.

[0056] (6) Dissolution performance test: The bridge plug is placed in a simulated shale oil well fluid environment and a dissolution performance test is conducted according to the predetermined dissolution conditions. The dissolution rate and degree of dissolution of each component of the bridge plug are monitored to ensure that its dissolution characteristics meet the design requirements and standard specifications. Considering the special composition of shale oil well fluid, the solution formulation for the dissolution performance test is optimized, and the dissolution of the sealing sleeve 2 is monitored in particular within 5-6 hours.

[0057] (7) Pumping test: Simulate the pumping process, test the stability and safety of the bridge plug and related equipment under the push of high pressure fluid, check whether each component will be displaced or damaged during the pumping process, and ensure the reliability of the pumping method.

[0058] Obviously, the above-disclosed embodiments of the present invention are merely for illustrating the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to only the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. It is neither necessary nor possible to exhaustively list all embodiments here.

Claims

1. A soluble bridge plug, characterized in that, include: mandrel (1); A sealing rubber sleeve (2) is slidably sleeved on the mandrel (1); The anchoring assembly includes a first slip (31), a second slip (34), a first cone (32), a second cone (35), a first pin (33), a second pin (36), a pressure cap (4), and a third pin (5). The first slip (31), the first cone (32), the second cone (35), and the second slip (34) are sequentially slidably fitted onto the mandrel (1). A sealing sleeve (2) is located between the first cone (32) and the second cone (35). The small end of the first cone (32) faces the first slip (31), and the first slip (31) can slide along the outer wall of the first cone (32) and be supported by the first cone (32). The small end of the second cone (35) faces the second slip (36). 4) The second slip (34) can slide along the outer wall of the second cone (35) and be opened by the second cone (35). The first pin (33) passes through the first cone (32) and the mandrel (1). The second pin (36) passes through the second cone (35) and the mandrel (1). The pressure cap (4) is fitted on the mandrel (1). The third pin (5) passes through the pressure cap (4) and the mandrel (1). The pressure cap (4) abuts against the first slip (31). The second slip (34) abuts against the abutment platform (101) on the mandrel (1). The mandrel (1), the first slip (31), the second slip (34), the first cone (32), the second push cylinder (13), and the sealing tube (2) are all made of soluble materials. The setting mechanism includes a setting shell (10), a flame column, a pressure transmitting piston (11), a first pusher (12), a second pusher (13), and a central shaft. The central shaft is connected to one end of the spindle (1). The first pusher (12) and the second pusher (13) are slidably sleeved on the central shaft. The pressure cap (4), the second pusher (13), the first pusher (12), and the pressure transmitting piston (11) abut against each other in sequence. The pressure transmitting piston (11) slides through the setting shell (10) and is located between the gunpowder column (9) and the first pusher (12).

2. The soluble bridge plug according to claim 1, characterized in that: The anchoring assembly also includes a first pad (6) and a second pad (7), both of which are fitted onto the mandrel (1). The first pad (6) is located between the first cone (32) and the sealing sleeve (2), and the second pad (7) is located between the second cone (35) and the sealing sleeve (2).

3. The soluble bridge plug according to claim 1, characterized in that: A support ring (8) is provided between the sealing rubber sleeve (2) and the mandrel (1).

4. The soluble bridge plug according to claim 1, characterized in that: It also includes an igniter (14) which is connected to the set-top housing (10).

5. The soluble bridge plug according to claim 4, characterized in that: It also includes a perforating gun, which is connected to an igniter (14).

6. The soluble bridge plug according to claim 4, characterized in that: A first sealing structure is provided between the igniter (14) and the seat housing (10), and a second sealing structure is provided between the igniter (14) and the perforating gun.

7. The soluble bridge plug according to claim 1, characterized in that: The outer walls of the first slip (31) and the second slip (34) are both provided with anti-slip teeth.

8. The soluble bridge plug according to claim 1, characterized in that: The sealing tube (2) is made of soluble rubber material.

9. The soluble bridge plug according to claim 1, characterized in that: The mandrel (1) is made of magnesium-aluminum alloy.

10. The soluble bridge plug according to claim 1, characterized in that: The first cone (32), the first slip (31), the second cone (35), and the second slip (34) are all made of soluble metal material.

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