A rubber sleeve structure for a packer

Abstract

The present application relates to the technical field of packer rubber sleeve, in particular to a rubber sleeve structure for packer, which comprises a pipeline, a packer assembly for blocking the downhole passage is arranged on the surface of the pipeline, a control assembly for controlling the packer assembly is arranged in the pipeline, a water injection assembly for injecting water into the packer assembly is arranged on the inner wall of the pipeline, the independent water injection assembly and the control assembly are linked to solve the problem that the rubber sleeve cannot be retrieved when the traditional packer water injection string is blocked or damaged, the water injection assembly directly delivers high-pressure liquid to the internal space of the rubber sleeve through the hydraulic pipe, and the liquid flow direction and pressure are accurately controlled by cooperating with the flow control pump to ensure the stable expansion of the rubber sleeve and realize sealing, and the control assembly can drive the blocking ring to open and close through mechanical transmission, even if the hydraulic pipe fails, the rubber sleeve sealing state can also be released through mechanical means, the packer is prevented from being stuck in the downhole and cannot be taken out, and the reliability and operation safety of the equipment are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of packer cartridge technology, specifically a cartridge structure for packers. Background Technology

[0002] A packer is a key tool used in downhole operations of oil and gas wells. It is mainly used to isolate oil, gas, and water layers to achieve functions such as stratified oil production, stratified water injection, stratified testing, and operations. The packer sleeve is a cylindrical rubber sealing product with elasticity and sealing capabilities. It is a key component of the packer in the stratified oilfield production process. According to the usage method, it can be divided into expansion packer sleeves and compression packer sleeves. After the expansion packer sleeve is lowered to the design depth, it is pressurized from the tubing. The high-pressure liquid acts on the inner cavity of the sleeve through the pressure transmission orifice inside the packer. Under the action of the throttling pressure difference, the sleeve expands to seal the annulus of the oil casing.

[0003] For example, a high-pressure water-injection expansion packer rubber sleeve with publication number CN209483282U uses high-strength, high-elasticity steel sheets, and the sealing length can reach 1500mm, which improves the long-term high-pressure sealing requirements of the packer; it ensures that the high-pressure water injection string can still withstand high-pressure sealing and normal recovery after unsealing after the high-pressure water injection string has undergone the process of stopping injection or backwashing. However, there are situations where the water injection string inside the packer is blocked or damaged and cannot deliver water normally. When the water injection string inside the packer cannot deliver water, the rubber sleeve cannot be retracted, which will cause the packer to get stuck downhole and cannot be retrieved. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a rubber sleeve structure for packers.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a rubber sleeve structure for a packer, including a pipe, a packer assembly for sealing downhole passages is provided on the surface of the pipe, a control assembly for controlling the packer assembly is provided inside the pipe, and a water injection assembly for injecting water into the packer assembly is provided on the inner wall of the pipe. The sealing assembly includes a lower outer shell and an upper outer shell, which are respectively fixedly sleeved on the outer walls of the upper and lower ends of the pipe. Annular grooves are formed on the inner walls of both the lower and upper outer shells. A collar is inserted into the inside of the annular groove. A fixing ring is fixedly sleeved on the other end of the collar. A rubber tube is embedded on the surface of the fixing ring. A sealing ring is fixedly sleeved on the surface of the collar located inside the rubber tube. Two through holes are symmetrically formed on the outer wall of the pipe. A plugging ring is movably sleeved on the inner wall of the pipe.

[0006] Specifically, the rubber sleeve is located outside the through hole, and the through hole corresponds to the plugging ring.

[0007] Specifically, the control component includes a motor, which is fixedly connected to the inner wall of the upper housing. A threaded rod is fixedly connected to the output end of the motor. Two sliding grooves are symmetrically opened on the inner wall of the upper housing. A slider is slidably connected inside the sliding groove. A threaded hole is opened on the upper surface of the slider. The threaded rod is threadedly connected inside the threaded hole. A push rod is fixedly connected to the lower surface of the slider. The lower end of the push rod is inserted into the pipe. Four connecting strips are fixedly connected to the surface of the push rod. The other end of the connecting strips is embedded in the inner wall of the plug ring. Two fixing plates are fixedly sleeved on the lower end surface of the push rod. Rubber blocks are embedded on the surface of the fixing plates.

[0008] Specifically, multiple fixing strips are fixedly connected to the inner wall of the pipe, and a clamping hole is opened at the center of the fixing strip, into which the push rod is inserted.

[0009] Specifically, the two rubber blocks are located at the upper and lower ends of the plugging ring, and the outer wall of the rubber blocks matches the inner wall of the plugging ring.

[0010] Specifically, the water injection assembly includes a hydraulic pipe and an embedded hole. The lower end of the hydraulic pipe is embedded in the inner wall of the pipe, the embedded hole is opened on the surface of the fixing strip, the hydraulic pipe is embedded inside the embedded hole, and the upper end of the hydraulic pipe is fixedly connected to a flow control pump.

[0011] Specifically, the hydraulic pipe is connected to the space inside the rubber cylinder, and the hydraulic pipe is set to fit against the inner wall of the pipeline.

[0012] The beneficial effects of this invention are: (1) The rubber sleeve structure for packers described in this invention solves the problem that the rubber sleeve cannot be retracted when the water injection string of the traditional packer is blocked or damaged by setting an independent water injection component and a control component. The water injection component directly delivers high-pressure liquid to the internal space of the rubber sleeve through the hydraulic pipe, and accurately controls the liquid flow direction and pressure with the flow direction control pump to ensure that the rubber sleeve expands stably and achieves sealing. At the same time, the control component can drive the sealing ring to open and close through mechanical transmission. Even if the hydraulic pipe fails, the rubber sleeve can be released mechanically to avoid the packer getting stuck downhole and unable to be taken out, which significantly improves the reliability of the equipment and the safety of operation.

[0013] (2) The rubber sleeve structure for packers described in this invention achieves a dual improvement in sealing performance and ease of operation by optimizing the assembly structure of the packer components and the transmission design of the control components. The insertion and matching of the collar and the ring groove in the packer components, the sealing protection of the sealing ring, and the corresponding setting of the rubber sleeve and the through hole ensure the effectiveness of high-pressure sealing. The control component adopts motor-driven threaded rod transmission. Through the synergistic action of the slider, push rod and connecting strip, the plugging ring is driven to move precisely. With the fixed strip limiting and guiding the push rod and the sealing assistance of the rubber block, the opening and closing action of the plugging ring is stable and smooth. This not only ensures the sealing reliability of the through hole, but also reduces the operational difficulty of downhole operations. It is suitable for the needs of layered oil production, water injection and other operations under complex working conditions. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 A cross-sectional view of a rubber sleeve structure for a packer provided by the present invention. Figure 1 ; Figure 2 A cross-sectional view of a rubber sleeve structure for a packer provided by the present invention. Figure 2 ; Figure 3 An external view of a rubber sleeve structure for a packer provided by the present invention; Figure 4 This invention provides a schematic diagram of a rubber sleeve structure for a packer. Figure 5 This invention provides a schematic diagram of a push rod structure for a packer's rubber sleeve structure; Figure 6 This invention provides a schematic diagram of the upper outer shell structure of a rubber sleeve structure for a packer; Figure 7 This invention provides a schematic diagram of a pipe structure for a packer using a rubber sleeve structure.

[0016] In the diagram: 1. Pipe; 2. Packing assembly; 21. Lower outer shell; 22. Upper outer shell; 23. Annular groove; 24. Collar ring; 25. Retaining ring; 26. Rubber sleeve; 27. Sealing ring; 28. Through hole; 29. ​​Plug ring; 3. Control assembly; 31. Motor; 32. Threaded rod; 33. Slide groove; 34. Slider; 35. Threaded hole; 36. Push rod; 37. Fixing strip; 38. Clamping hole; 39. Connecting strip; 310. Fixing plate; 311. Rubber block; 4. Water injection assembly; 41. Hydraulic pipe; 42. Embedded hole; 43. Flow direction control pump. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1 to 7 The present invention provides the following technical solutions: Example 1: A packer sleeve structure includes a pipe 1, a packer assembly 2 for sealing downhole passages is provided on the surface of the pipe 1, a control assembly 3 for controlling the packer assembly 2 is provided inside the pipe 1, and a water injection assembly 4 for injecting water into the packer assembly 2 is provided on the inner wall of the pipe 1. The sealing assembly 2 includes a lower outer shell 21 and an upper outer shell 22. The lower outer shell 21 and the upper outer shell 22 are respectively fixedly sleeved on the upper and lower outer walls of the pipe 1. The inner walls of the lower outer shell 21 and the upper outer shell 22 are provided with annular grooves 23. A collar 24 is inserted into the inside of the annular groove 23. A fixing ring 25 is fixedly sleeved on the other end of the collar 24. A rubber tube 26 is embedded on the surface of the fixing ring 25. A sealing ring 27 is fixedly sleeved on the surface of the collar 24 located inside the rubber tube 26. Two through holes 28 are symmetrically opened on the outer wall of the pipe 1. A plugging ring 29 is movably sleeved on the inner wall of the pipe 1.

[0019] The rubber sleeve 26 is located outside the through hole 28, which corresponds to the plug ring 29. The through hole 28 enables communication between the inside of the pipe 1 and the inside of the rubber sleeve 26. The plug ring 29 can slide along the inner wall of the pipe 1 to open and close the through hole 28, thereby controlling the liquid flow and sealing state inside the rubber sleeve 26.

[0020] In use, the entire packer sleeve structure is first lowered to the designed depth in the well. The lower outer shell 21 and upper outer shell 22 are used to initially position the pipeline 1 and the downhole casing. In the packer assembly 2, the collar 24 is securely connected to the upper and lower outer shells via the annular groove 23. The fixing ring 25 supports and fixes the sleeve 26. The sealing ring 27 prevents high-pressure liquid inside the sleeve 26 from leaking from the connection between the collar 24 and the sleeve 26, ensuring sealing performance. The plugging ring 29 initially blocks the through hole 28, preventing downhole impurities from entering the pipeline 1 and providing a precondition for the expansion sealing of the sleeve 26. When encountering... When the water injection component 4 malfunctions and cannot operate, the control ring 29 moves downward, causing it to lock onto the surface of the lower rubber block 311, blocking the lower half of the pipe 1. This allows the fluid inside the rubber sleeve 26 to drain through the through hole 28 and the pipe 1, causing the rubber sleeve 26 to retract. This prevents the plug from getting stuck in the well. Alternatively, the control ring 29 can move upward to block the upper half of the pipe 1, allowing the fluid in the well to flow into the rubber sleeve 26 through the through hole 28 under its own pressure. This achieves expansion and locking of the rubber sleeve 26, significantly improving the reliability of the equipment and the safety of operation.

[0021] Example 2: The technical solution of this example, which differs from that of Example 1, includes: the control component 3 includes a motor 31, which is fixedly connected to the inner wall of the upper housing 22. The output end of the motor 31 is fixedly connected to a threaded rod 32. Two sliding grooves 33 are symmetrically opened on the inner wall of the upper housing 22. A slider 34 is slidably connected inside the sliding grooves 33. A threaded hole 35 is opened on the upper surface of the slider 34. The threaded rod 32 is threadedly connected inside the threaded hole 35. A push rod 36 is fixedly connected to the lower surface of the slider 34. The lower end of the push rod 36 is inserted into the pipe 1. Four connecting strips 39 are fixedly connected to the surface of the push rod 36. The other end of the connecting strips 39 is embedded in the inner wall of the plug ring 29. Two fixing pieces 310 are fixedly sleeved on the lower surface of the push rod 36. A rubber block 311 is embedded on the surface of the fixing piece 310.

[0022] Multiple fixing strips 37 are fixedly connected to the inner wall of the pipe 1. A clamping hole 38 is opened at the center of the fixing strip 37. The push rod 36 is inserted into the clamping hole 38. The fixing strip 37 plays a limiting and guiding role for the push rod 36 through the clamping hole 38, preventing the push rod 36 from deviating during movement and ensuring the stability and accuracy of the opening and closing action of the plug ring 29.

[0023] Two rubber blocks 311 are located at the upper and lower ends of the plugging ring 29. The outer wall of the rubber block 311 matches the inner wall of the plugging ring 29. The symmetrically arranged rubber blocks 311 can enhance the sealing performance between the plugging ring 29 and the inner wall of the pipe 1 from both ends when the plugging ring 29 seals the through hole 28. At the same time, they can buffer and reduce friction when the plugging ring 29 moves, thus extending the service life of the components.

[0024] In use, when it is necessary to open the through hole 28 to inject water into the expansion of the rubber sleeve 26, the motor 31 is started. The output end of the motor 31 drives the threaded rod 32 to rotate. Since the threaded rod 32 is threadedly connected to the threaded hole 35 on the slider 34, and the slider 34 is limited by the slide groove 33 and cannot rotate, the rotation of the threaded rod 32 will be converted into the linear movement of the slider 34 along the slide groove 33. The slider 34 drives the push rod 36 to move synchronously. The fixing strip 37 guides and limits the push rod 36 through the clamping hole 38 to prevent the push rod 36 from moving. During the process, the push rod 36 drives the plugging ring 29 to slide on the inner wall of the pipe 1 through the connecting strip 39, so that the plugging ring 29 is disengaged from the through hole 28. At this time, the through hole 28 is in the open state. At the same time, the rubber blocks 311 at the upper and lower ends of the plugging ring 29 are tightly fitted with the inner wall of the plugging ring 29, which can reduce the friction loss when the plugging ring 29 moves, and enhance the sealing effect when the plugging ring 29 is in the blocked state. When it is necessary to close the through hole 28, the motor 31 is started in reverse, and the plugging ring 29 is reset through the above transmission structure to re-seal the through hole 28.

[0025] Example 3: The technical solution of this example that differs from that of Example 2 includes: the water injection component 4 includes a hydraulic pipe 41 and a hole 42. The lower end of the hydraulic pipe 41 is embedded in the inner wall of the pipe 1. The hole 42 is opened on the surface of the fixing strip 37. The hydraulic pipe 41 is embedded in the hole 42. The upper end of the hydraulic pipe 41 is fixedly connected to a flow direction control pump 43.

[0026] The hydraulic pipe 41 is connected to the space inside the rubber cylinder 26. The hydraulic pipe 41 is set to fit against the inner wall of the pipe 1. The hydraulic pipe 41 directly delivers high-pressure liquid into the rubber cylinder 26 to drive the rubber cylinder 26 to expand and seal. The way it is set to fit against the inner wall of the pipe 1 can save internal space, avoid interference with other components, and improve the installation stability of the hydraulic pipe 41.

[0027] In use, after the plugging ring 29 opens the through hole 28, the flow control pump 43 is started, and high-pressure liquid is delivered to the internal space of the packer 26 through the hydraulic pipe 41. The hydraulic pipe 41 is fixed to the fixing strip 37 through the embedded hole 42 and is set to fit the inner wall of the pipe 1, which not only ensures the stability of the installation, but also saves the internal space of the pipe 1. After the high-pressure liquid enters the packer 26, it pushes the packer 26 to expand outward until the outer wall of the packer 26 is tightly fitted with the inner wall of the downhole casing, thus achieving the sealing of the annulus. When it is necessary to release the sealing, the flow control pump 43 controls the hydraulic pipe 41 to depressurize in the reverse direction. The packer 26 contracts and resets under its own elasticity. If the hydraulic pipe 41 is blocked or damaged and cannot depressurize, the plugging ring 29 can be kept open by the control component 3, so that the liquid inside the packer 26 flows into the pipe 1 through the through hole 28, thereby achieving the forced contraction of the packer 26 and ensuring that the packer can be successfully removed from the downhole.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A packer sleeve structure, comprising a pipe (1), a packer assembly (2) for sealing downhole passages is provided on the surface of the pipe (1), a control assembly (3) for controlling the packer assembly (2) is provided inside the pipe (1), and a water injection assembly (4) for injecting water into the packer assembly (2) is provided on the inner wall of the pipe (1). Its features are: The sealing assembly (2) includes a lower outer shell (21) and an upper outer shell (22). The lower outer shell (21) and the upper outer shell (22) are respectively fixedly sleeved on the upper and lower outer walls of the pipe (1). The inner walls of the lower outer shell (21) and the upper outer shell (22) are provided with annular grooves (23). A collar (24) is inserted into the inside of the annular groove (23). A fixing ring (25) is fixedly sleeved on the other end of the collar (24). A rubber tube (26) is embedded on the surface of the fixing ring (25). A sealing ring (27) is fixedly sleeved on the surface of the collar (24) located inside the rubber tube (26). Two through holes (28) are symmetrically opened on the outer wall of the pipe (1). A plugging ring (29) is movably sleeved on the inner wall of the pipe (1).

2. The rubber sleeve structure for a packer according to claim 1, characterized in that: The rubber sleeve (26) is located outside the through hole (28), which is opposite to the plug ring (29).

3. The rubber sleeve structure for a packer according to claim 1, characterized in that: The control component (3) includes a motor (31), which is fixedly connected to the inner wall of the upper housing (22). The output end of the motor (31) is fixedly connected to a threaded rod (32). Two sliding grooves (33) are symmetrically opened on the inner wall of the upper housing (22). A slider (34) is slidably connected inside the sliding groove (33). A threaded hole (35) is opened on the upper surface of the slider (34). The threaded rod (32) is threadedly connected inside the threaded hole (35). A push rod (36) is fixedly connected to the lower surface of the slider (34). The lower end of the push rod (36) is inserted into the pipe (1). Four connecting strips (39) are fixedly connected to the surface of the push rod (36). The other end of the connecting strips (39) is embedded in the inner wall of the plug ring (29). Two fixing pieces (310) are fixedly sleeved on the lower surface of the push rod (36). A rubber block (311) is embedded on the surface of the fixing piece (310).

4. The rubber sleeve structure for a packer according to claim 3, characterized in that: Multiple fixing strips (37) are fixedly connected to the inner wall of the pipe (1). A clamping hole (38) is opened at the center of the fixing strip (37), and the push rod (36) is inserted into the clamping hole (38).

5. A rubber sleeve structure for a packer according to claim 3, characterized in that: The two rubber blocks (311) are located at the upper and lower ends of the plugging ring (29), and the outer wall of the rubber block (311) matches the inner wall of the plugging ring (29).

6. A rubber sleeve structure for a packer according to claim 1, characterized in that: The water injection assembly (4) includes a hydraulic pipe (41) and a recess (42). The lower end of the hydraulic pipe (41) is embedded in the inner wall of the pipe (1). The recess (42) is opened on the surface of the fixing strip (37). The hydraulic pipe (41) is embedded inside the recess (42). The upper end of the hydraulic pipe (41) is fixedly connected to a flow direction control pump (43).

7. A rubber sleeve structure for a packer according to claim 6, characterized in that: The hydraulic pipe (41) is connected to the space inside the rubber cylinder (26), and the hydraulic pipe (41) is set to fit against the inner wall of the pipe (1).

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