Insertion pipe packer and water injection pipe column

Abstract

The utility model provides an intubation tube packer and a water injection string, the intubation tube packer comprises a lock catch sleeve and an intubation tube which are in anchoring connection, the outer wall of the intubation tube is fixedly provided with an elastic anchor fluke, the tail end of the elastic anchor fluke is provided with a suspended claw hook, and the inner wall of the lock catch sleeve is provided with a groove matched with the claw hook; in a connection state, the claw hooks of the elastic anchor flukes enter the grooves of the lock catch sleeve for anchoring; after a certain tensile force is applied to the intubation tube, the elastic anchor flukes contract inwards under the tensile force, so that the claw hooks are separated from the grooves and the lock catch sleeve. According to the utility model, the insertion tube and the lock catch sleeve are anchored together by adopting the matching between the elastic anchor flukes and the grooves, and the insertion tube can be separated from the lock catch sleeve only by applying a certain tensile force to the insertion tube; and as the separation depends on the tensile force and the elastic anchor flukes to contract inwards, the influence caused by the falling of impurities or the entering of grit is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of oilfield water injection application, and particularly relates to an intubation packer and a water injection pipe string. Background Art

[0002] Downhole intubation packers are usually used in production tasks such as oil well sealing and production, gas well completion and production, and injection well ultra-high pressure water and gas injection. Figure 1 and Figure 2 As shown, the cannula packer includes a cannula 1 and a locking sleeve 2. The cannula 1 features a serrated anchor claw 1-1, and the inner wall of the locking sleeve 2 has a matching area 2-1 that matches the serrated anchor claw 1-1. The cannula 1 must be detached from the locking sleeve 2 by twisting it clockwise. After extended use, the cannula packer may become unable to detach from the cannula 1 due to impurities falling from the top of the cannula packer or sand and gravel entering the anchor claw 1-1. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an intubation packer and a water injection pipe string, which can be easily detached after long-term use.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows: a cannula packer, comprising a locking sleeve and a cannula that are anchored and connected, an elastic anchor claw fixed to the outer wall of the cannula, a suspended grab hook provided at the end of the elastic anchor claw, and a groove configured for the grab hook provided on the inner wall of the locking sleeve;

[0005] In the connected state, the hook of the elastic anchor claw enters the groove of the locking sleeve and is anchored; after a certain pulling force is applied to the cannula, the elastic anchor claw contracts inward under the pulling force, causing the hook to disengage from the groove and the locking sleeve.

[0006] According to the above solution, a boss is provided on the outer wall of the cannula, the front end of the elastic anchor claw is fixedly connected to the boss, and a certain distance is provided between the hook of the elastic anchor claw and the outer wall of the cannula, and the distance is greater than the depth of the groove.

[0007] According to the above solution, the front end of the elastic anchor claw is connected to a sealing block which is circumferentially sealed to the outer wall of the cannula; in the connected state, the locking sleeve is in close contact with the sealing block.

[0008] According to the above solution, the sealing block is a metal sealing block.

[0009] According to the above solution, the sealing block is sealed and connected to the outer wall of the cannula via the sealant.

[0010] According to the above solution, the elastic anchor claw is a strip-shaped component, and the grab hook is a protruding block protruding outward at the end of the strip-shaped component.

[0011] According to the above solution, the strip-shaped component and the protrusion are formed at one time.

[0012] According to the above solution, the number of the elastic anchor claws is at least 3 and they are evenly distributed circumferentially on the outer wall of the cannula.

[0013] According to the above solution, the elastic anchor claw bites the outer wall of the cannula through the upper and lower double slips, thereby being fixedly connected to the outer wall of the cannula.

[0014] A water injection string comprises the intubation packer.

[0015] The beneficial effects of the utility model are:

[0016] 1. The cannula and the locking sleeve are anchored together by the cooperation between the elastic anchor claws and the groove. The cannula can be separated from the locking sleeve by applying a certain pulling force to the cannula. Since the separation is achieved by relying on the pulling force and the inward contraction of the elastic anchor claws, it will not be affected by falling impurities or sand entering.

[0017] 2. By setting a sealing block at the front end of the elastic anchor claw, the sealing block is in close contact with the locking sleeve in the connected state, preventing impurities or gravel from entering, further avoiding the impact of impurities or gravel on the elastic anchor claw, and eliminating the phenomenon of the cannula being stuck or buried. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the cannula in the prior art.

[0019] Figure 2 It is a structural diagram of a locking sleeve in the prior art.

[0020] Figure 3 This is a schematic structural diagram of an intubation tube according to an embodiment of the present invention.

[0021] Figure 4 This is a structural diagram of a locking sleeve according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the connection state of the intubation packer according to one embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the intubation packer in a detached state according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the intubation packer in a detached state according to an embodiment of the present invention.

[0025] In the picture:

[0026] 1-cannula, 1-1-serrated anchor claw, 101-elastic anchor claw, 1011-catch hook, 102-sealing block;

[0027] 2-locking sleeve, 2-1-configuration area, 201-groove. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to specific examples and accompanying drawings.

[0029] like Figures 3 to 7 As shown, the present invention provides a cannula packer, comprising a locking sleeve 2 and a cannula 1 that are anchored together. An elastic anchor claw 101 is fixed to the outer wall of the cannula 1, with a suspended hook 1011 at the end of the elastic anchor claw 101. A groove 201 is provided on the inner wall of the cannula 2 for aligning with the hook 1011. In a connected state, the hook 1011 of the elastic anchor claw 101 enters the groove 201 of the locking sleeve 2 for anchoring. When a certain pulling force is applied to the cannula 1, the elastic anchor claw 101 contracts inward under the pulling force, causing the hook 1011 to disengage from the groove 201 and the locking sleeve 2.

[0030] Furthermore, the outer wall of the cannula 1 is provided with a boss, and the front end of the elastic anchor 101 is fixedly connected to the boss. More specifically, the boss is engaged by upper and lower slips, thereby securing the anchor. Other methods of fixed connection are also possible. A certain gap is provided between the hook 1011 of the elastic anchor 101 and the outer wall of the cannula 1. This gap is greater than the depth of the groove 201, so that when retracted inward, the hook 1011 can completely disengage from the groove 201.

[0031] To prevent the ingress of foreign matter and gravel, the front end of the elastic anchor claw 101 is connected to a sealing block 102 that is circumferentially sealed to the outer wall of the cannula 1. In this connected state, the locking sleeve 2 is in close contact with the sealing block 102. In this embodiment, the sealing block 102 is a metal sealing block that is sealed to the outer wall of the cannula using sealant.

[0032] In this embodiment, the elastic fluke 101 is a strip-shaped member, and the hook 1011 is a protruding block protruding outward from the end of the strip-shaped member. To ensure the stability and firmness of the elastic fluke 101, the strip-shaped member and the protruding block are formed in one piece.

[0033] In order to improve the anchoring effect, the number of the elastic anchor claws is at least 3 and they are evenly distributed on the outer wall of the cannula 1 in the circumferential direction.

[0034] The present invention also provides a water injection string including the cannula packer, wherein a locking sleeve 2 is fixed on the top of the water injection string and used in conjunction with the cannula. Furthermore, the locking sleeve 2 is directly processed on the top of the water injection string.

[0035] Tests have shown that the device can be successfully removed and reused after prolonged high-pressure water injection. During detachment, a lifting force of approximately 60 kN can be applied for recovery.

[0036] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this utility model.

Claims

1. A cannula packer comprising a locking sleeve and a cannula connected by anchoring, characterized in that: An elastic anchor claw is fixed to the outer wall of the cannula, a suspended grab hook is provided at the end of the elastic anchor claw, and a groove is provided on the inner wall of the locking sleeve to be configured with the grab hook; In the connected state, the hook of the elastic anchor claw enters the groove of the locking sleeve and is anchored; after a certain pulling force is applied to the cannula, the elastic anchor claw contracts inward under the pulling force, causing the hook to disengage from the groove and the locking sleeve.

2. The intubation packer according to claim 1, characterized in that: The outer wall of the cannula is provided with a boss, the front end of the elastic anchor claw is fixedly connected to the boss, and a certain distance is set between the hook of the elastic anchor claw and the outer wall of the cannula, and the distance is greater than the depth of the groove.

3. The intubation packer according to claim 2, characterized in that: The front end of the elastic anchor claw is connected to a sealing block which is circumferentially sealed with the outer wall of the cannula; in the connected state, the locking sleeve is in close contact with the sealing block.

4. The intubation packer according to claim 3, characterized in that: The sealing block is a metal sealing block.

5. The intubation packer according to claim 3 or 4, characterized in that: The sealing block is sealed and connected to the outer wall of the cannula through sealant.

6. The intubation packer according to any one of claims 1 to 4, characterized in that: The elastic anchor claw is a strip-shaped component, and the grab hook is a bulge protruding outward at the end of the strip-shaped component.

7. The intubation packer according to claim 6, characterized in that: The strip-shaped component and the protrusion are formed in one piece.

8. The intubation packer according to claim 1, characterized in that: The number of the elastic anchor claws is at least 3 and they are evenly distributed on the outer wall of the cannula in the circumferential direction.

9. The intubation packer according to claim 1, characterized in that: The elastic anchor claw bites the outer wall of the cannula through the upper and lower double slips, thereby being fixedly connected to the outer wall of the cannula.

10. A water injection string, characterized by: The intubation packer comprises the intubation packer according to any one of claims 1 to 9.

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