A packer for preventing sealing rubber and slips from failing

Abstract

The present application relates to a packer that prevents the failure of sealing rubber and slips, and relates to the field of packers, including a central tube, a sealing rubber assembly arranged on the central tube, a slip assembly and an actuator assembly. By setting a retaining ring and a limiting ring, the second piston is relatively stationary with the central tube when lowering into the well; when the packer is hung on the wall, a set driving force is applied and it cannot move downward, and the lowering into the well can be stopped at this time, effectively avoiding the premature failure of the packer. The limiting ring is set to be approximately C-shaped, and a matching inclined surface is set on the side, so that when the second piston moves, the limiting ring automatically moves toward the center. The present application has the technical effect of avoiding the failure of the packer when the sealing rubber and slips are deployed in advance.

Description

Technical Field

[0001] The present application relates to the field of packers, and in particular to a packer capable of preventing sealing rubber and slips from failing. Background Art

[0002] In the oil industry, the use of hydraulically set recoverable packers for completion and transformation operations is very convenient and efficient. The suspension of slips and the sealing of the sealing rubber cylinder are two crucial links, which directly affect the success of subsequent completion operations. When going down the well, once there are bulges or foreign objects caused by scratches on the surface of the well wall, if the packer continues to advance, the sealing rubber and slips of the packer will be deployed prematurely, making the packer ineffective. Summary of the invention

[0003] In order to prevent the premature deployment of the sealing rubber and slips, which may lead to the failure of the packer, the present application provides a packer that prevents the failure of the sealing rubber and slips.

[0004] The present application provides a packer for preventing sealing rubber and slips from failing, which adopts the following technical solution:

[0005] A packer for preventing sealing rubber and slips from failing, comprising a center tube, a sealing rubber assembly, a slip assembly and an actuator assembly arranged on the center tube, the actuator assembly comprising a first piston, a second piston, an inner piston, a shear screw, a retaining snap ring, a fixed snap ring and a limit snap ring, the first piston and the inner piston are slidably arranged on the center tube, the second piston is arranged on the outside of the first piston and the inner piston, the first piston is connected to the sealing rubber assembly, the inner piston is connected to the slip assembly through the shear screw, the fixed snap ring is fixedly connected to the center tube, the retaining snap ring is sleeved on the center tube, the limit snap ring is sleeved on the inner piston, and the limit snap ring is in contact with the second piston.

[0006] By adopting the above technical solution and setting the retaining clamp and the limiting clamp, the second piston can remain relatively still with the center pipe when being lowered into the well, thereby preventing the center pipe from continuing to move downward when the packer is hung on the wall, thereby stopping the packer from being lowered into the well, thereby effectively avoiding premature failure of the packer.

[0007] In a specific possible implementation manner, the shape of the limiting clamp ring is substantially set to be approximately C-shaped, and the diameter of the limiting clamp ring in an initial state is smaller than the inner diameter of the second piston.

[0008] By adopting the above technical solution, the limiting snap ring is set to be approximately C-shaped, and a matching inclined surface is set on the side, so that when the second piston moves, the limiting snap ring automatically moves toward the center to ensure smooth movement of the second piston.

[0009] In a specific possible implementation manner, the second piston is fixedly connected to the first piston, the first piston, the second piston, the inner piston and the central tube together form a driving chamber, and the central tube is in communication with the driving chamber.

[0010] By adopting the above technical solution and setting the driving chamber, the hydraulic oil in the central tube can flow into the driving chamber, thereby driving the inner piston to move.

[0011] In a specific possible implementation manner, the axial thrust of the central tube acts on the second piston through the fixing clamp ring, the retaining clamp ring and the limiting clamp ring.

[0012] By adopting the above technical solution, by having the fixing clamp, the retaining clamp and the limiting clamp act on the second piston, the driving force of the center pipe can act on the second piston through the retaining clamp and the limiting clamp, so that the second piston remains relatively still with the center pipe when going down the well, thereby achieving the technical effect of preventing the center pipe from continuing to move downward.

[0013] In a specific implementation scheme, the side of the limiting clamp is provided with a first matching portion and a second matching portion, the first matching portion is vertically matched with the retaining clamp, and the second matching portion is set as a slope, and the second matching portion matches with the slope of the second piston.

[0014] By adopting the above technical solution,

[0015] In a specific implementation scheme, a sealing ring is provided between the first piston and the second piston, a sealing ring is provided between the first piston and the center tube, a sealing ring is provided between the inner piston and the second piston, and a sealing ring is provided between the inner piston and the center tube.

[0016] By adopting the above technical solution, the second matching part is an inclined surface, so that the limiting clamp ring can still contact the second piston after the limiting clamp ring is separated from the inner piston, thereby affecting the smooth upward movement of the first piston. When the second piston moves upward relatively, the limiting clamp ring can be driven to move toward the center through the second matching part.

[0017] In a specific possible implementation manner, a mounting groove is provided on the central tube, and the fixing clamp ring is clamped in the mounting groove.

[0018] By adopting the above technical solution, the mounting groove plays a role in fixing the retaining ring.

[0019] In a specific possible implementation manner, upper joints and lower joints are provided at both ends of the central tube.

[0020] By adopting the above technical solution, the upper joint and the lower joint can be adapted and connected to the outside.

[0021] In a specific possible implementation mode, an end rubber sleeve and a middle rubber sleeve are provided at the lower right side of the upper joint.

[0022] By adopting the above technical solution, the arrangement of the end rubber sleeve and the middle rubber sleeve can seal the central tube.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By setting the retaining clamp and the limit clamp, when the packer is hung on the wall, the set driving force is applied and it cannot move downward. At this time, the downhole can be stopped, effectively avoiding the premature failure of the packer.

[0025] 2. By setting the limiting snap ring to be approximately C-shaped and setting a matching inclined surface on the side, the limiting snap ring can automatically move toward the center when the second piston moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure in the initial state of this application;

[0027] Figure 2 for Figure 1 A magnified view of middle;

[0028] Figure 3 This is a schematic diagram of the structure when this application is actively expanded;

[0029] Figure 4 for Figure 3 Enlarged view of middle B;

[0030] Figure 5 It is a schematic diagram of the specific structure of the limiting clamp.

[0031] Explanation of the accompanying drawings: 1. Center tube; 2. Sealing rubber assembly; 3. Slip assembly; 4. Actuator assembly; 5. Sealing ring; 11. Mounting groove; 41. First piston; 42. Second piston; 43. Inner piston; 44. Shear screw; 45. Retaining snap ring; 46. Fixed snap ring; 47. Limiting snap ring; 48. Drive chamber; 471. First mating part; 472. Second mating part; 6. Upper joint; 7. Lower joint; 8. End rubber sleeve; 9. Middle rubber sleeve. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings.

[0033] In the description of the invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0034] The present application embodiment discloses a packer for preventing the failure of sealing rubber and slips, referring to Figure 1 and Figure 3 , including a central tube 1, upper joints 6 and lower joints 7 are arranged at both ends of the central tube 1, end rubber sleeves 8 and middle rubber sleeves 9 are arranged at the lower right side of the upper joint 6, and the arrangement of the end rubber sleeves 8 and the middle rubber sleeves 9 makes the sealing ability of the central tube 1 high and is not easy to lose the seal.

[0035] Reference Figure 2 and Figure 4 The center tube 1 is also provided with a sealing rubber assembly 2, a slip assembly 3 and an actuator assembly 4, and the actuator assembly 4 is used to control the expansion of the sealing rubber assembly 2 and the slip assembly 3; the actuator assembly 4 includes a first piston 41, a second piston 42, an inner piston 43, a shear screw 44, a retaining ring 45, a fixed ring 46 and a limiting ring 47. The center tube 1 is provided with a mounting groove 11, and the fixed ring 46 is clamped in the mounting groove 11. The first piston 41 and the inner piston 43 are slidably arranged on the center tube 1, and the second piston 42 is arranged outside the first piston 41 and the inner piston 43, and the second piston 42 is fixedly connected to the first piston 41. The first piston 41, the second piston 42, the inner piston 43 and the center tube 1 form a driving chamber 48. In the embodiment of the present application, the width of the driving chamber 48 is set to 2mm. The center tube 1 is connected to the driving chamber 48, and the hydraulic oil flows from the inside of the center tube 1 into the driving chamber 48, thereby driving the first piston 41 and the inner piston 43 to move to both sides to provide driving force. The first piston 41 is connected to the sealing rubber assembly 2, and the inner piston 43 is connected to the slip assembly through the shear screw 44. The first piston 41 is used to control the expansion of the sealing rubber assembly 2, and the inner piston 43 is used to control the expansion of the slip assembly 3. The fixed snap ring 46 is fixedly connected to the center pipe 1, the retaining snap ring 45 is sleeved on the center pipe 1, the limiting snap ring 47 is sleeved on the inner piston 43, and the limiting snap ring 47 is in contact with the side wall of the second piston 42; wherein, the shape of the limiting snap ring 47 is substantially set to be approximately C-shaped. That is, the diameter of the limiting snap ring 47 in the initial state is smaller than the inner diameter of the second piston 42, and the limiting snap ring 47 is installed on the inner piston 43 by expanding it; when the packer reaches the specified position, oil is injected into the driving chamber 48, so that the inner piston 43 moves downward, and the limiting snap ring 47 is blocked by the second piston 42 and remains stationary until the limiting snap ring 47 is separated from the inner piston 43, and the limiting snap ring 47 returns to the initial state, thereby ensuring that the first piston 41 moves upward smoothly.

[0036] Reference Figure 5 The side of the limiting snap ring 47 is provided with a first matching portion 471 and a second matching portion 472. The first matching portion 471 is vertically matched with the retaining snap ring 45, that is, the first matching portion 471 is a vertical plane, and the retaining snap ring 45 is provided with a vertical plane adapted to the first matching portion 471. The second matching portion 472 is provided to match the inclined surface of the second piston 42, that is, the inner wall of the second piston 42 is provided with an inclined surface matched with the second matching portion 472. Among them, by setting the second matching portion 472 as an inclined surface, the limiting snap ring 47 is in a natural drooping state after being separated from the inner piston 43, causing the limiting snap ring 47 to still contact with the second piston 42, thereby affecting the smooth upward movement of the first piston 41. The setting of the second matching portion 472 enables the limiting snap ring 47 to move toward the center when the second piston 42 moves relatively upward.

[0037] Reference Figure 1 and Figure 3 A sealing ring 5 is disposed between the first piston 41 and the second piston 42, between the first piston 41 and the center tube 1, between the inner piston 43 and the second piston 42, and between the inner piston 43 and the center tube 1. By disposing the sealing ring 5, the driving chamber 48 is always in a sealed state to prevent leakage of hydraulic oil.

[0038] The implementation principle of the embodiment of the present application is: when the packer is hung on the wall, that is, when the packer is stuck with the well wall when being lowered into the well, and if the limiting clamp ring 47 is not provided, the axial thrust of the center pipe 1 acts on the second piston 42 through the fixing clamp ring 46, the retaining clamp ring 45 and the limiting clamp ring 47, and the shear screw 44 between the second piston 42 and the slip assembly 3 will be cut off, so that the second piston 42 drives the first piston 41 to move upward relatively, thereby making the sealing rubber assembly 2 unfold, and the unfolded sealing rubber assembly 2 is tightly fitted with the well wall, and the continued movement of the center pipe 1 will cause the sealing rubber assembly 2 to be scratched and damaged against the well wall, and when the packer is hung on the wall, the set driving force will be applied and it will be unable to move downward. Due to the setting of the retaining ring 45 and the limiting retaining ring 47, when the center pipe 1 continues to move downward, the driving force of the center pipe 1 acts on the second piston 42 through the retaining ring 45 and the limiting retaining ring 47. By setting the retaining ring 45 and the limiting retaining ring 47, the second piston 42 is relatively stationary with the center pipe 1 when going down the well to prevent the center pipe 1 from continuing to move downward. At this time, the well can be stopped, effectively preventing the premature failure of the isolation device.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A packer for preventing sealing rubber and slips from failing, characterized in that: The invention comprises a central tube (1), a sealing rubber assembly (2), a slip assembly (3) and an actuator assembly (4) arranged on the central tube (1), the actuator assembly (4) comprising a first piston (41), a second piston (42), an inner piston (43), a shear screw (44), a retaining ring (45), a fixing ring (46) and a limiting ring (47), the first piston (41) and the inner piston (43) being slidably arranged on the central tube (1), the second piston (42) being arranged outside the first piston (41) and the inner piston (43), the first piston (41) being connected to the sealing rubber assembly (2), the inner piston (43) being connected to the slip assembly (3) via the shear screw (44), the fixing ring (46) being fixedly connected to the central tube (1), the retaining ring (45) being sleeved on the inner piston (43), and the retaining ring (45) being sleeved on the inner piston (43). On the center tube (1), the limiting snap ring (47) is sleeved on the inner piston (43), and the limiting snap ring (47) is in contact with the second piston (42); the shape of the limiting snap ring (47) is substantially set to be approximately C-shaped, and the diameter of the limiting snap ring (47) in the initial state is smaller than the inner diameter of the second piston (42); the axial thrust of the center tube (1) acts on the second piston (42) through the fixing snap ring (46), the retaining snap ring (45) and the limiting snap ring (47); the side of the limiting snap ring (47) is provided with a first matching portion (471) and a second matching portion (472), the first matching portion (471) and the retaining snap ring (45) are vertically matched, and the second matching portion (472) is set to be an inclined surface, and the second matching portion (472) matches the inclined surface of the second piston (42).

2. A packer for preventing sealing rubber and slip failure according to claim 1, characterized in that: The second piston (42) is fixedly connected to the first piston (41); the first piston (41), the second piston (42), the inner piston (43) and the central tube (1) together form a driving chamber (48); the central tube (1) is in communication with the driving chamber (48).

3. A packer for preventing sealing rubber and slip failure according to claim 1, characterized in that: A sealing ring (5) is provided between the first piston (41) and the second piston (42), a sealing ring (5) is provided between the first piston (41) and the center tube (1), a sealing ring (5) is provided between the inner piston (43) and the second piston (42), and a sealing ring (5) is provided between the inner piston (43) and the center tube (1).

4. A packer for preventing sealing rubber and slip failure according to claim 1, characterized in that: The central tube (1) is provided with a mounting groove (11), and the fixing clamp ring (46) is clamped in the mounting groove (11).

5. A packer for preventing sealing rubber and slip failure according to claim 1, characterized in that: An upper joint (6) and a lower joint (7) are provided at both ends of the central tube (1).

6. A packer for preventing sealing rubber and slip failure according to claim 5, characterized in that: An end rubber sleeve (8) and a middle rubber sleeve (9) are arranged at the lower right side of the upper joint (6).

7. A packer for preventing sealing rubber and slip failure according to claim 2, characterized in that: The width of the driving cavity (48) is set to 2 mm.

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