Multipurpose soluble bridge plug

Abstract

The utility model relates to the technical field of petroleum underground construction, in particular to a multipurpose soluble bridge plug which comprises a soluble bridge plug body, the soluble bridge plug body comprises a central pipe and a releasing rod, the releasing rod is connected to one end of the central pipe through a shear pin, a containing cavity is formed between the central pipe and the releasing rod, and the central pipe is connected with the releasing rod. The multifunctional soluble bridge plug comprises a central pipe and a release lever, the release lever is provided with a containing cavity, the containing cavity is used for containing a soluble ball, the side, close to the release lever, of the containing cavity is detachably connected with a stop lever, the other end of the central pipe is detachably connected with a plug, and by arranging a plurality of detachable stop levers and other parts, existing soluble bridge plugs of various models are combined to the multifunctional soluble bridge plug. The stock cost and stacking cost of an enterprise can be reduced, the expenditure of the enterprise is reduced, meanwhile, the working efficiency during soluble bridge plug construction is improved, the time for repeatedly replacing different bridge plugs is shortened, different parts can be flexibly selected according to different construction scenes and environments for disassembly and replacement, different construction requirements are met, and the practicability is high. The working efficiency is further improved, and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum underground construction, in particular to a multi-purpose soluble bridge plug. Background Art

[0002] Bridge plug is an important tool for isolation in the process of oil exploration and development. It can separate the upper and lower layers, so that different layers can be mined or operated independently. Its main function is to realize layered mining and staged fracturing, and it has important application value in the development of resources such as oil and natural gas. At the same time, bridge plug is also an important part of well completion engineering, which plays an important role in improving the production and recovery rate of oil and gas wells.

[0003] Soluble bridge plugs are made of soluble materials and can dissolve autonomously in the wellbore without drilling and grinding, which greatly improves production efficiency, reduces production costs, and solves the grinding problem of deep wells and ultra-deep horizontal wells. The application of soluble bridge plugs enables wellhead plugging in the process of deep-sea oil production, improving the efficiency and safety of oil production.

[0004] However, as domestic oil has entered the middle and late stages of development, problems such as thin reservoirs, low pressure, low permeability, high water content and reserve-capacity imbalance have become increasingly prominent. Ordinary bridge plugs cannot meet the needs of efficient mining when faced with complex situations. Workers need to replace bridge plugs in a targeted manner according to actual usage needs, which affects work efficiency. At the same time, the company's stocking personnel need to prepare multiple models and specifications of bridge plugs, increasing stocking costs. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that when existing ordinary bridge plugs face complex situations, they need to be replaced specifically according to actual usage needs, which causes the stocking personnel to prepare bridge plugs of multiple models and specifications, increasing the stocking cost and affecting work efficiency. A multi-purpose soluble bridge plug is provided.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A multi-purpose soluble bridge plug comprises a soluble bridge plug, wherein the soluble bridge plug comprises a center tube and a release lever, wherein the release lever is connected to one end of the center tube via a shear pin, wherein a receiving chamber is provided between the center tube and the release lever, wherein the receiving chamber is used to receive a soluble ball, wherein a stop rod is detachably connected to one side of the receiving chamber close to the release lever, and a plug is detachably connected to the other end of the center tube.

[0008] This proposal recommends a multi-purpose soluble bridge plug, including a main body of the soluble bridge plug, the soluble bridge plug also including a central tube and a release lever, a receiving chamber is provided between the central tube and the release lever, the receiving chamber is used to receive a soluble ball, the soluble ball can be pre-placed in the receiving chamber when in use, or the soluble ball can be pumped into the receiving chamber for a second time according to a conventional method, the soluble ball is used to block the passage of the central tube of the bridge plug to ensure the sealing inside the tube. The receiving ball is detachably connected with a blocking rod near the side of the release lever, the blocking rod can constrain the soluble ball, when reverse discharge is required due to special circumstances such as sand blockage, the blocking rod can limit the soluble ball in the receiving chamber to prevent the soluble ball from moving to the upper section of the bridge plug during reverse discharge and blocking the return flow channel, the blocking rod can be flexibly disassembled and installed according to construction requirements, the other end of the central tube is detachably connected with a plug, the plug is used to bear reverse pressure, when temporary plugging is required underground, the plug can be connected to the central tube to withstand reverse pressure and isolate the bottom hole pressure, the plug can be flexibly disassembled and installed according to construction requirements.

[0009] A multi-purpose soluble bridge plug in the present scheme combines various existing soluble bridge plugs into a multi-purpose soluble bridge plug by providing a number of detachable baffles and other parts, thereby reducing the company's inventory and stacking costs, reducing corporate expenses, and improving work efficiency during soluble bridge plug construction, reducing the time for repeated replacement of different bridge plugs. The disassembly and replacement of different parts can be flexibly selected according to different construction scenes and environments to meet different construction needs, further improving work efficiency, and saving construction time.

[0010] As a preferred solution of the utility model, a gasket is further connected between the plug and the central tube.

[0011] This solution recommends that a gasket is also connected between the plug and the center tube. The gasket is used to strengthen the sealing effect between the plug and the center tube to prevent a small gap between the plug and the center tube under high pressure, resulting in poor sealing effect and affecting the pressure isolation effect.

[0012] As a preferred solution of the utility model, the plug and the blocking rod are both made of dissolving materials.

[0013] This solution recommends that the plug and the baffle rod be made of soluble materials. The use of soluble materials does not require recovery operations after use. The bridge plug dissolves in the wellbore liquid to react and dissolves. After dissolution, it does not block the pipeline. The soluble material can use materials such as Alcoa alloy or polyvinyl alcohol.

[0014] As a preferred solution of the utility model, the outer sleeve of the central tube is provided with a rubber sleeve, the outer side of the central tube and located on both sides of the rubber sleeve are symmetrically connected to cones, and the outer side of the central tube and located on both sides of the cone are symmetrically connected to slip seats.

[0015] This proposal recommends that a rubber sleeve is provided on the outside of the central tube, and the rubber sleeve is used for sealing. When the soluble bridge plug is pushed into the target position, the rubber sleeve is squeezed, expanded and sealed to achieve sealing between the bridge plug and the casing. This sealing effect can effectively isolate and plug the formation, providing protection for subsequent oil and gas production or downhole operations. The central tube is symmetrically connected to the cone on both sides of the rubber sleeve. The design of the cone can ensure that the bridge plug remains stable during the delivery process and avoids accidental falling off or displacement before reaching the predetermined position. Secondly, the cone plays a key role in the setting process of the bridge plug. Through the shearing effect of the cone, accurate setting at the predetermined position can be achieved, thereby ensuring the effective plugging effect of the bridge plug. This design makes the soluble bridge plug have higher reliability and accuracy in the sealing operation of oil and gas wells. The central tube is symmetrically connected to the slip seat on both sides of the cone. The slip seat plays the role of anchoring the cone and locking the rubber sleeve. It is a key component to ensure the reliability of the soluble bridge plug and determines the anchoring effect of the bridge plug. It can withstand huge pressure and avoid the failure and breakage of the slips, which would affect the anchoring of the bridge plug.

[0016] As a preferred solution of the utility model, a composite sheet is provided between the rubber cylinder and the cone.

[0017] The composite sheet recommended in this scheme is a soluble material, which mainly supports the rubber tube. During the setting process, the composite sheet will deform with the expansion of the rubber tube, and the outer diameter will increase to fit the casing, supporting the rubber tube in the subsequent pressure-bearing process. This design can ensure that the bridge plug can remain stable under complex geological conditions and effectively achieve the plugging effect. At the same time, the selection and use of the composite sheet also directly affects the reliability and service life of the soluble bridge plug.

[0018] As a preferred solution of the utility model, a hoop is provided on the slip seat.

[0019] This scheme recommends that a hoop ring be provided on the slip seat, which mainly plays the role of maintaining the integrity of the slip seat and preventing premature setting when a collision occurs during the lowering process (during the lowering process, the bridge plug will collide with the wellbore and foreign objects in the wellbore, and the hoop ring can ensure that the bridge plug can be lowered normally to the designated position). At the same time, the design and use of the hoop ring can also reduce the risk of breakage or failure of the slip seat, and improve the overall performance and reliability of the soluble bridge plug.

[0020] As a preferred solution of the utility model, a lower joint is connected to one side of the slip seat away from the release lever.

[0021] In this solution, a lower joint is connected to the side of the slip seat away from the release lever, and the lower joint is connected to the center tube through a thread. During the lowering process, the lower joint needs to bear the weight of the bridge plug and the friction during the delivery process, so it needs to have a certain load-bearing capacity and wear resistance; at the same time, the lower joint also needs to be reliably connected to the delivery tool to ensure that the bridge plug can be smoothly pushed to the predetermined position; during the sealing process, the lower joint provides a reaction force to the adjacent slip seat, so that the components between the lower joint and the push ring can be squeezed and expanded to form a sealing; when under reverse pressure, the reverse pressure acts on the lower joint, and the lower joint needs to ensure reliable strength.

[0022] As a preferred solution of the utility model, a push ring is connected to one side of the slip seat close to the release lever.

[0023] The main function of the push ring in this scheme is to transmit thrust, push the bridge plug to the predetermined position, and ensure that the connection between the slip seat and the bridge plug is firm and reliable. The thrust transmitted by the push ring realizes the extrusion, expansion and sealing of the rubber cylinder. The design of the push ring can withstand large thrust and friction, ensuring that the bridge plug will not fall off or shift during the pushing process.

[0024] As a preferred solution of the utility model, the push ring is connected to the push tube at a side close to the release lever.

[0025] As a preferred solution of the utility model, the pipe ends of the push cylinder and the release lever facing away from the center are connected to a setting tool.

[0026] As the connecting parts of the setting tool, the push tube and the release lever can effectively transfer the thrust provided by the setting tool to the soluble bridge plug and push the bridge plug to the predetermined position. This design ensures the continuity and effectiveness of the thrust and improves the operation efficiency.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0028] 1. A multi-purpose soluble bridge plug in this scheme combines various existing soluble bridge plugs into a multi-purpose soluble bridge plug by setting a number of detachable baffles and other parts, which can reduce the company's stocking cost and stacking cost, reduce corporate expenses, and at the same time improve the work efficiency during the construction of soluble bridge plugs, reducing the time for repeated replacement of different bridge plugs. The disassembly and replacement of different parts can be flexibly selected according to different construction scenes and environments to meet different construction needs, further improve work efficiency, and save construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the ball-throwing mode structure of a multi-purpose soluble bridge plug of the utility model;

[0030] Figure 2It is a schematic diagram of a ball-dropping mode setting structure of a multi-purpose soluble bridge plug of the utility model;

[0031] Figure 3 It is a schematic diagram of a ball-throwing mode fracturing structure of a multi-purpose soluble bridge plug of the utility model;

[0032] Figure 4 It is a schematic diagram of the structure of a preset ball mode of a multi-purpose soluble bridge plug of the utility model;

[0033] Figure 5 It is a schematic diagram of a pre-set ball mode setting structure of a multi-purpose soluble bridge plug of the utility model;

[0034] Figure 6 It is a schematic diagram of the ball cage mode structure of a multi-purpose soluble bridge plug of the utility model;

[0035] Figure 7 It is a schematic diagram of a ball cage mode flowback structure of a multi-purpose soluble bridge plug of the utility model;

[0036] Figure 8 It is a schematic diagram of the dead blocking mode structure of a multi-purpose soluble bridge plug of the utility model;

[0037] Fig. 9 This is a schematic diagram of the reverse pressure-bearing structure of a multi-purpose soluble bridge plug in the dead blocking mode of the utility model.

[0038] Icons: 1-national standard screw; 2-push cylinder; 3-release lever; 4-center tube; 5-shear pin; 6-gear rod; 7-soluble ball; 8-push ring; 9-hoop; 10-slip seat; 11-cone; 12-composite sheet; 13-rubber cylinder; 14-lower joint; 15-washer; 16-plug. DETAILED DESCRIPTION

[0039] The utility model is described in detail below in conjunction with the accompanying drawings.

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0041] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] Example 1

[0043] like Figures 1 to 3 As shown, a rubber sleeve 13 is sleeved on the outside of the center tube 4, and cones 11 are symmetrically connected to the outside of the center tube 4 and located on both sides of the rubber sleeve 13, and a slip seat 10 is symmetrically connected to the outside of the center tube 4 and located on both sides of the cone 11, a composite sheet 12 is arranged between the rubber sleeve 13 and the cone 11, a hoop 9 is arranged on the slip seat 10, a lower joint 14 is connected to the side of the slip seat 10 away from the release rod 3, a push ring 8 is connected to the side of the slip seat 10 close to the release rod 3, and the push ring 8 is connected to the push tube 2 on the side close to the release rod 3, and the ends of the push tube 2 and the release rod 3 away from the center tube 4 are connected to a sealing tool.

[0044] The left ends of the push tube 2 and the release lever 3 are connected to the sealing tool, and the national standard screw 1 is used to prevent retreat. The thrust provided by the sealing tool causes the push ring 8 to move to the right, while the lower joint 14 and the center pipe 4 are not displaced under the action of the release lever 3 and the shear pin 5, thereby squeezing the components between the push ring 8 and the lower joint 14. After the rubber tube 13 is squeezed, it is axially compressed and radially expanded to fit the inner wall of the casing. Under the action of the thrust, the slip seats 10 at both ends of the rubber tube 13 move along the conical axis of the cone 11. The slip teeth on the slip seat 10 are anchored into the casing wall by radial displacement and radial expansion. After the reaction force is greater than the shear force of the shear pin 5, the shear pin 5 breaks, the release lever 3 and the push tube 2 are separated from the tool, the sealing is completed, the setting tool, the push tube 2 and the release lever 3 are lifted up, and the perforating operation is carried out. After the perforating operation is successfully completed, the soluble ball 7 is pumped into the accommodating cavity between the release lever 3 and the center pipe 4. After the seat is seated, the center pipe 4 moves to the right under the action of pressure until it contacts with the push ring 8, and the fracturing operation can be carried out.

[0045] The advantage of the ball-throwing mode is that if secondary pumping is required due to reasons such as perforation ignition failure, the pumping flow path remains unobstructed and pumping can be carried out smoothly.

[0046] Example 2

[0047] like Figures 4 to 5 As shown, the difference between Example 2 and Example 1 is that the soluble ball 7 is pre-placed in the accommodating cavity between the central pipe 4 and the release rod 3 in advance, and is pumped to the predetermined position together with the soluble bridge plug body. After the release operation is completed, the soluble ball 7 stays at the predetermined position. After the perforating operation is completed, there is no need to pump the soluble ball 7, and the fracturing operation can be carried out directly.

[0048] The advantage of the preset ball mode is that it saves the costs associated with a pumping operation.

[0049] Example 3

[0050] like Figure 6 to Figure 7 As shown, the difference between Example 3 and Example 1 is that the blocking rod 6 is disassembled and connected to the side of the accommodating chamber close to the release rod 3, and the soluble ball 7 is pre-set in the accommodating chamber between the central pipe 4 and the release rod 3 in advance, and is pumped to a predetermined position together with the soluble bridge plug body. After the release is completed and the perforating operation is started, the fracturing operation can be carried out.

[0051] The advantage of the ball cage mode is that during the fracturing process, if fracturing is not successful due to special reasons (such as sand blockage, etc.) and backflow is required, the soluble ball 7 can be separated from the ball seat surface to form a backflow channel. However, due to the constraint of the gear lever 6, the soluble ball 7 will not move to the upper section of the bridge plug to block the backflow channel.

[0052] Example 4

[0053] like Figures 8 to 9 As shown, the difference between Example 4 and Example 1 is that one end of the lower joint 14 of the central tube 4 is detachably connected with a plug 16 and is sealed by a gasket 15 .

[0054] The application scenario of the dead plugging mode is that when special reasons occur underground and temporary plugging is required, the dead plugging mode can be used for operations. After the soluble bridge plug is lowered and the sealing is completed, reverse pressure can be applied to isolate the bottom hole pressure.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-purpose soluble bridge plug, characterized in that: The invention comprises a soluble bridge plug, the soluble bridge plug comprising a central tube (4) and a release lever (3), the release lever (3) being connected to one end of the central tube (4) via a shear pin (5), a receiving chamber being provided between the central tube (4) and the release lever (3), the receiving chamber being used to receive a soluble ball (7), a stopper rod (6) being detachably connected to one side of the receiving chamber close to the release lever (3), and a plug (16) being detachably connected to the other end of the central tube (4).

2. A multi-purpose soluble bridge plug according to claim 1, characterized in that: A gasket (15) is also connected between the plug (16) and the central tube (4).

3. The multi-purpose soluble bridge plug according to claim 1, characterized in that: The plug (16) and the blocking rod (6) are both made of soluble materials.

4. The multi-purpose soluble bridge plug according to claim 1, characterized in that: The center tube (4) is externally sleeved with a rubber sleeve (13), the center tube (4) is externally and symmetrically connected to the cone (11) on both sides of the rubber sleeve (13), and the center tube (4) is externally and symmetrically connected to the slip seat (10) on both sides of the cone (11).

5. A multi-purpose soluble bridge plug according to claim 4, characterized in that: A composite sheet (12) is provided between the rubber cylinder (13) and the cone (11).

6. A multi-purpose soluble bridge plug according to claim 4, characterized in that: The slip seat (10) is provided with a hoop (9).

7. The multi-purpose soluble bridge plug according to claim 4, characterized in that: A lower joint (14) is connected to one side of the slip seat (10) facing away from the release lever (3).

8. The multi-purpose soluble bridge plug according to claim 4, characterized in that: A push ring (8) is connected to one side of the slip seat (10) close to the release lever (3).

9. A multi-purpose soluble bridge plug according to claim 8, characterized in that: The push ring (8) is connected to the push tube (2) at a side close to the release lever (3).

10. A multi-purpose soluble bridge plug according to claim 9, characterized in that: The ends of the push cylinder (2) and the release lever (3) facing away from the central tube (4) are connected to a setting tool.

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