Anti-creep mechanical backout anchor

Abstract

The utility model relates to a kind of anti-worming mechanical anti-jacking anchor, including the upper center tube and lower center tube of inside and outside sleeve connection, the upper end of the upper center tube is connected with upper joint, the lower end of lower center tube is connected with lower joint, it is characterized by: limit locking mechanism is equipped between the upper and lower center tube, elastic piston sleeve is sleeved on the upper center tube, the inner end of the elastic piston sleeve is communicated with the liquid inlet hole being arranged on the upper center tube, cone and slip are sleeved on the lower center tube, and the cone is connected with the upper center tube.This tool is effectively anchored on the inner wall of casing after mechanical setting, prevents pipe string worm, anchor is released after pipe string is lifted, improves pipe string safe extraction operation success rate, prolongs the service life of injection pipe string.

Description

Technical Field

[0001] This utility model pertains to downhole tools in the oilfield field, and in particular relates to an anti-creep mechanical anti-top anchor. Background Technology

[0002] After years of development, the water injection tubing is subject to various factors such as temperature effect, bulging effect, spiral bending effect, and piston effect during operation, resulting in tubing failure and seriously affecting its service life. To reduce tubing creep, anchoring tools are usually used to anchor and protect the tubing. However, existing anchoring tools such as hydraulic anchors, support anchors, and bidirectional slip anchors have their own focuses, but they also have some shortcomings: (1) During intermittent water injection, the hydraulic anchor claws extend and retract, causing damage to the sealing ring and tool failure; (2) Support anchors are mainly used to suspend the tubing and cannot prevent the effects of upward jacking force; (3) Although bidirectional slip anchors can effectively anchor on the inner wall of the casing and have strong anchoring force, there is a risk in removing them. In response to the above problems, this utility model has developed an anti-creep mechanical anti-jacking anchor, which can reduce tubing creep and improve the success rate of safe tubing removal operations, thereby extending the service life of the water injection tubing. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an anti-creep mechanical anti-top anchor to address the shortcomings of the existing technology. This tool is effectively anchored to the inner wall of the casing after mechanical locking, preventing the pipe string from creeping. The anchor is released after the pipe string is lifted, which improves the success rate of safe pipe string removal and extends the service life of the water injection pipe string.

[0004] The beneficial effects of this utility model are as follows: an anti-creep mechanical anti-top anchor includes an upper central tube and a lower central tube with inner and outer sleeves. The upper end of the upper central tube is connected to an upper connector, and the lower end of the lower central tube is connected to a lower connector. The feature is that a limiting locking mechanism is provided between the upper and lower central tubes. An elastic piston sleeve is fitted outside the upper central tube. The inner end of the elastic piston sleeve is connected to a liquid inlet hole provided on the upper central tube. A cone and a slip are fitted outside the lower central tube. The cone is connected to the upper central tube.

[0005] According to the above technical solution, the elastic piston sleeve includes a spring fitted outside the upper central tube, a support sleeve that abuts against the spring and is fitted outside the upper central tube, and a piston sleeve that abuts against the support sleeve. The upper and lower ends of the piston sleeve located at the liquid inlet hole are respectively sealed to the upper central tube.

[0006] According to the above technical solution, the limiting locking mechanism includes a locking ball, a locking ball hole provided on the upper central tube, and a groove provided on the lower central tube for accommodating the locking ball. The lower end of the piston sleeve is provided with a step with an increased inner diameter, which is configured with the step at the lower end of the upper central tube. When the piston sleeve slides towards the upper connector under the action of hydraulic pressure, the lower end of the piston sleeve with a changed diameter serves as an accommodating space for accommodating the locking ball when unlocking.

[0007] According to the above technical solution, a limiting step is provided on the lower central tube at the cone connection point, and the cone abuts against the limiting step.

[0008] According to the above technical solution, the upper end of the cone is connected to the lower end of the upper central tube and is fixed and prevented from loosening by anti-loosening pins.

[0009] According to the above technical solution, the cone is also provided with a T-shaped inclined groove so that the slip is embedded in the cone.

[0010] According to the above technical solution, the slip is fitted on the outer periphery of the lower end of the lower central tube, with the upper end located in the inclined slide on the outer side of the cone and the lower end located on the inner side of the lower connector.

[0011] According to the above technical solution, the locking teeth of the KAVO are designed with an anti-overshooting serrated structure.

[0012] According to the above technical solution, the lower connector is also provided with a T-shaped inclined surface, and the T-shaped inclined surface groove fixes the slip inside the lower connector.

[0013] According to the above technical solution, the upper connector, upper central tube, piston sleeve, lower central tube, and lower connector are all equipped with O-ring seals for sealing.

[0014] The beneficial effects achieved by this utility model are as follows:

[0015] 1. This utility model effectively anchors the tubing to the inner wall after mechanical clamping, preventing tubing creep. Anchoring is released after the tubing is lifted, improving the success rate of safe tubing removal and extending the service life of the water injection tubing. Furthermore, the mechanical clamping structure ensures the clamp remains stable after clamping and does not retract on its own, effectively avoiding the problems of seal damage and tool failure caused by the reciprocating extension and retraction of the anchor claws in hydraulic clamping structures.

[0016] 2. By setting an embedded anti-top-out slip, the tool can withstand a high upward force during water injection and resist the peristalsis of the tubing caused by intermittent water injection.

[0017] 3. Once the tool is released, it will lock to prevent it from getting stuck again, thus improving the success rate of releasing the anchor. It has good retrieval performance, further enhancing the safety of the anchoring tool and helping to extend the service life of the water injection string. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram provided for an embodiment of the present utility model.

[0020] The components include: 1. Upper connector, 2. O-ring seal, 3. Spring, 4. Support sleeve, 5. Upper central tube, 6. Piston sleeve, 7. Lower central tube, 8. Locking ball, 9. Anti-loosening pin, 10. Cone, 11. Slip, 12. Lower connector, and a. Upper central tube 6 inlet hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Example 1:

[0023] This embodiment provides an anti-creep mechanical anti-top anchor, including an upper central tube 5 and a lower central tube 7 with inner and outer sleeves. The upper end of the upper central tube 5 is connected to an upper connector 1, and the lower end of the lower central tube 7 is connected to a lower connector 12. A limiting locking mechanism is provided between the upper and lower central tubes. An elastic piston sleeve is fitted outside the upper central tube. The inner end of the elastic piston sleeve is connected to the liquid inlet a provided on the upper central tube. A cone 10 and a slip 11 are fitted outside the lower central tube 7. The cone 10 is connected to the upper central tube 1.

[0024] In this embodiment, the elastic piston sleeve includes a spring 3 fitted outside the upper central tube, a support sleeve 4 that abuts against the spring and is fitted outside the upper central tube, and a piston sleeve 6 that abuts against the support sleeve. The upper and lower ends of the piston sleeve 6 located at the liquid inlet a are respectively sealed to the upper central tube 5.

[0025] In this embodiment, the limiting locking mechanism includes a locking ball 8, a locking ball hole provided on the upper central tube, and a groove provided on the lower central tube for accommodating the locking ball. The lower end of the piston sleeve is provided with a step with an increased inner diameter, which is configured with the step at the lower end of the upper central tube. When the piston sleeve slides towards the upper connector under hydraulic pressure, the lower end of the piston sleeve with a changed diameter serves as an accommodating space for accommodating the locking ball when unlocking.

[0026] Specifically, the upper end of the upper central tube 5 is threadedly connected to the upper connector 1 and sealed by an O-ring 2. A spring 3 and a support sleeve 4 are fitted around the upper outer periphery, and several liquid inlet holes a are provided in the middle. The liquid inlet holes a are fitted around the outer periphery of the piston sleeve 6 and sealed by an O-ring 2. Several locking ball holes are provided at the lower part, and the lower end is threadedly connected to the cone 10. The lower end is provided with a threaded hole for an anti-loosening pin and is fixed by an anti-loosening pin 9.

[0027] The spring 3 is fitted around the outer periphery of the support sleeve 4, with its upper end supported on the lower end of the upper connector 1 and its lower end supported on the lower end of the support sleeve 4.

[0028] The piston sleeve 6 is fitted around the outer periphery of the upper central tube 5 and sealed by the O-ring 2. The upper end is configured with a step on the upper central tube 5 for limiting, and the lower end is configured with a step that is configured with the step on the lower end of the upper central tube 5.

[0029] The upper end of the lower center tube 7 is placed on the inner circumference of the upper center tube 5 and sealed by the O-ring 2. The lower end is threadedly connected to the lower connector 12 and sealed by the O-ring 2. A concave groove is provided in the middle for placing the locking ball 8, and a step is provided in the middle to be configured with the cone 10.

[0030] The upper end of the cone 10 is threaded to the lower end of the upper central tube 5 and is fixed with an anti-loosening pin. The cone 10 is also provided with a T-shaped inclined groove, which makes the cone 10 and the slip 11 tightly connected, so that the slip 11 is embedded in the cone 10.

[0031] Sealing process: After the packer is lowered to the design position by the anti-top anchor, the oil pipe is pressurized to the starting pressure value to seat the packer. At the same time, under the action of hydraulic pressure, liquid enters from the inlet hole a of the upper central tube 5, compressing the piston sleeve 6. Under the action of hydraulic pressure, the piston sleeve 6 drives the support sleeve 4 to move upward and compress the spring 3. After reaching the stroke, the locking ball 8 slides from the locking ball hole in the middle of the upper central tube 5 to the step set at the lower end of the piston sleeve 6. At this time, the oil pipe is kept hydraulically pressed down on the tubing string. The upper central tube 5 drives the cone 10 to move downward. The slip 11 slides along the inclined slide of the cone 11 until it opens and anchors on the inner wall of the casing, completing the seating process.

[0032] Unlocking process: Lift the tube column, the upper connector 1 drives the upper central tube 5 and the cone 10 to move upward, and at the same time drives the locking ball 8 to move upward and return to the locking ball hole set in the lower part of the upper central tube 5. The slip 11 slides along the inclined slide on the outside of the cone 10 to the initial position, completing the unlocking. At this time, the cone 10 and the slip 11 are locked to prevent them from getting stuck again.

[0033] Example 2:

[0034] Example 2 is basically the same in structure as Example 1, but with further description and definition of the slip: the slip 11 is fitted onto the outer periphery of the lower end of the lower central tube 7, with its upper end located in the inclined slide on the outer side of the cone 10 and its lower end located inside the lower connector 12. The slip teeth of the slip 11 are designed with an anti-sawtooth structure.

[0035] The lower connector 12 is threadedly connected to the lower central tube 7 and sealed by an O-ring 2. The lower connector 12 is also provided with a T-shaped bevel, which allows the slip 11 to be fixed inside the lower connector 12.

[0036] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A creep-resistant mechanical anti-jacking anchor, comprising an upper central tube and a lower central tube with inner and outer sleeves, wherein the upper end of the upper central tube is connected to an upper connector, and the lower end of the lower central tube is connected to a lower connector, characterized in that: A limiting locking mechanism is provided between the upper and lower central tubes. An elastic piston sleeve is fitted outside the upper central tube, and the inner end of the elastic piston sleeve is connected to the liquid inlet hole provided on the upper central tube. A cone and a collet are fitted outside the lower central tube, and the cone is connected to the upper central tube.

2. The anti-creep mechanical anti-jacking anchor according to claim 1, characterized in that: The elastic piston sleeve includes a spring fitted outside the upper central tube, a support sleeve that abuts against the spring and is fitted outside the upper central tube, and a piston sleeve that abuts against the support sleeve. The upper and lower ends of the piston sleeve located at the liquid inlet are respectively sealed to the upper central tube.

3. The anti-creep mechanical anti-jacking anchor according to claim 2, characterized in that: The limiting and locking mechanism includes a locking ball, a locking ball hole on the upper central tube, and a groove on the lower central tube for accommodating the locking ball. The lower end of the piston sleeve is provided with a step with an increased inner diameter, which is configured with the step at the lower end of the upper central tube. When the piston sleeve slides towards the upper connector under hydraulic pressure, the diameter-changing part at the lower end of the piston sleeve serves as a accommodating space for accommodating the locking ball during unlocking.

4. The anti-creep mechanical anti-jacking anchor according to claim 1 or 2, characterized in that: A limiting step is provided on the lower central tube at the cone connection point, and the cone abuts against the limiting step.

5. The anti-creep mechanical anti-jacking anchor according to claim 1 or 2, characterized in that: The upper end of the cone is connected to the lower end of the upper central tube and is fixed in place by anti-loosening pins.

6. The anti-creep mechanical anti-jacking anchor according to claim 1 or 2, characterized in that: The cone is also equipped with a T-shaped bevel groove, which allows the slip to be embedded in the cone.

7. The anti-creep mechanical anti-jacking anchor according to claim 6, characterized in that: The clasp is fitted around the lower outer periphery of the lower central tube, with its upper end located inside the inclined slide on the outside of the cone and its lower end located inside the lower connector.

8. The anti-creep mechanical anti-jacking anchor according to claim 7, characterized in that: The KAVA tooth is designed with an anti-overshoot serrated structure.

9. The anti-creep mechanical anti-jacking anchor according to claim 8, characterized in that: The lower connector is also provided with a T-shaped bevel, which allows the slip to be fixed inside the lower connector.

10. The anti-creep mechanical anti-jacking anchor according to claim 1 or 2, characterized in that: The upper connector, upper central tube, piston sleeve, lower central tube, and lower connector are all equipped with O-ring seals.

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