Reverse tubing anchor
By designing a reverse tubing anchor, anchoring and unsealing are achieved through rotation and lifting operations, solving the stability problem of traditional tubing tools in complex downhole operating environments, improving the stability and operating efficiency of the tubing, and ensuring the smoothness and safety of oil production operations.
Patent Information
- Application Number
- CN202520242685.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Traditional tubing securing techniques and tools are insufficient to meet stability requirements in complex downhole operating environments, especially after prolonged use, they face challenges such as corrosion, wear, and pressure changes.
The reverse tubing anchor, which includes components such as a plug, lower connecting pipe, upper connecting column, wedge block, and anchor claw, is used to achieve anchoring and unsealing through rotation and lifting operations. The wedge block and spring design improves stability and reliability.
It achieves stable anchoring and rapid, reliable unsealing in complex downhole operating environments, improving tubing stability and operational efficiency, and ensuring smooth and safe oil production operations.
Smart Images
Figure CN223724557U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of downhole operation, especially relates to reverse tubing anchor. BACKGROUND
[0002] Reverse tubing anchor is a key tool in oil exploitation, mainly used for stabilizing tubing string. In oil well exploitation, tubing will be subjected to various complex forces, such as oil layer fluid upthrust, pressure generated by stratum creep, etc. Reverse tubing anchor can effectively resist these forces by anchoring in the well wall, preventing tubing from moving up, deforming or damaging, and ensuring the stability of tubing in the well. This not only helps to maintain smooth oil production operation, but also avoids the situation of production decline and equipment failure caused by tubing problems, and improves the efficiency and safety of exploitation.
[0003] In oil exploitation, the common types of reverse tubing anchor are hydraulic and mechanical. In hydraulic type, differential pressure tubing anchor works by differential pressure of oil casing, composed of anchor body and anchor jaw, differential pressure drives anchor jaw to extend and anchor, and anchor jaw is retracted by spring force when oil tubing is pressurized and drained. Hydraulic bidirectional and unidirectional slip tubing anchor of pressure holding type drives slip to extend and anchor through tubing pressure, and special operation or tubing string lifting is required for unsealing. Mechanical slip tubing anchor relies on tubing string weight to anchor, and anchor is achieved by cone pressing slip; mechanical tubing tension anchor is anchored by rotating and lifting, and released by lowering tubing string.
[0004] In the process of oilfield exploitation, especially in the complex downhole operation environment, tubing often faces challenges such as corrosion, wear and pressure change after long-term use. In this environment, traditional tubing fixing technology and tools have been difficult to meet the stability requirements in complex operation environment. Therefore, reverse tubing anchor is proposed to solve the above problems. SUMMARY
[0005] In order to make up for the above shortcomings, the utility model provides reverse tubing anchor, aiming at improving the problem that traditional tubing fixing technology and tools in the prior art have been difficult to meet the stability requirements in complex operation environment.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] Reverse tubing anchor, comprising a plugging device:
[0008] The plugging device is used for plugging the working barrel function;
[0009] The lower connecting pipe is threadedly connected at one end in the plugging device, and is used for connecting the plugging device and the lower connecting column function;
[0010] The upper connecting column is used for connecting the wedge-shaped block, and the inner wall of the wedge-shaped block is provided with a cutting block;
[0011] The wedge-shaped block is used for pushing out the dovetail connecting block to make it abut against the inner wall of the central pipe.
[0012] As a further description of the above technical solution:
[0013] The upper connecting column is used for connecting the wedge-shaped block, and the inner wall of the wedge-shaped block is provided with a cutting block;
[0014] As a further description of the above technical solution:
[0015] The wedge-shaped block is used for pushing out the dovetail connecting block to make it abut against the inner wall of the central pipe.
[0016] As a further description of the above technical solution:
[0017] The wedge-shaped block is used for pushing out the dovetail connecting block to make it abut against the inner wall of the central pipe.
[0018] As a further description of the above technical solution:
[0019] The wedge-shaped block is used for pushing out the dovetail connecting block to make it abut against the inner wall of the central pipe.
[0020] As a further description of the above technical solution:
[0021] The wedge-shaped block is used for pushing out the dovetail connecting block to make it abut against the inner wall of the central pipe.
[0022] The utility model has the advantages of the following beneficial effects:
[0023] In the utility model, the central pipe is lifted, the central pipe is rotated, the internal cutting block is cut, the anchor claw is loosened and is far away from the inner wall of the central pipe, then the anchor claw is retracted through the dovetail connecting block and the spring, the effect of stable unsealing is achieved, the traditional oil pipe fixing technology and tool are difficult to meet the stable demand under the complex operation environment, and the stability of the reverse oil pipe anchor is improved. BRIEF DESCRIPTION OF DRAWINGS
[0024] Fig. 1 The utility model provides a reverse oil pipe anchor's three-dimensional schematic view;
[0025] Fig. 2 The utility model provides a reverse oil pipe anchor's lower connecting column outer wall structure schematic view;
[0026] Fig. 3The utility model provides a reverse oil pipe anchor's upper connecting pipe section structure schematic diagram.
[0027] Legend:
[0028] 1, the obturator; 2, lower connecting pipe; 3, upper connecting pipe; 4, anchor claw; 5, lower connecting column; 6, upper connecting column; 7, spring; 8, cut-off block; 9, dovetail connecting block; 10, wedge block. DETAILED DESCRIPTION
[0029] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.
[0030] Reference Figs. 1-3 , the utility model provides an embodiment: reverse oil pipe anchor, including obturator:
[0031] The obturator is used for plugging the working barrel function;
[0032] Lower connecting pipe, the lower connecting pipe one end is connected in obturator inside, the lower connecting pipe is used for connecting obturator and lower connecting column function;
[0033] Upper connecting column, the wedge block inner wall is provided with cut-off block, the upper connecting column is used for connecting wedge block;
[0034] Wedge block, the wedge block lateral wall fixedly connected in upper connecting column inner wall, the wedge block is used for pushing out dovetail connecting block and makes it rest in the inner wall of central pipe, wedge block 10 lateral wall fixedly connected in upper connecting column 6 inner wall, upper connecting column 6 one end is fixedly connected with upper connecting pipe 3, upper connecting column 6 outer wall is fixedly connected with wedge block 10, wedge block 10 lateral wall is arranged in dovetail connecting block 9 lateral wall, upper connecting column 6 outer wall is provided with spring 7, spring 7 one end is fixedly connected in upper connecting column 6 inner wall, spring 7 other end is fixedly connected in dovetail connecting block 9 bottom, dovetail connecting block 9 lateral wall is fixedly connected with anchor claw 4, anchor claw 4 adopts high-strength steel material, has good mechanical strength and wear resistance, anchor claw 4 lateral wall is arranged in upper connecting column 6 outer wall, anchor claw 4 inner wall is arranged in lower connecting column 5 inside, lower connecting column 5 one end is fixedly connected with lower connecting pipe 2;
[0035] Specifically, in the use of reverse tubing anchor, the operator first screw the upper connecting pipe 3 in one end of the center pipe, ensure the connection is firm. Then, through the lifting equipment to drive the tubing anchor down until to the designated downhole position. After reaching the position, using the obturator 1 to seal the pipeline to prevent liquid leakage. Then, through the center pipe to rotate, drive the upper connecting pipe 3 to move. The movement of the upper connecting pipe 3 will further drive the upper connecting column 6 to move. When the upper connecting column 6 moves, the wedge block 10 on its outer wall will be involved. Due to the slope design between the wedge block 10 and the anchor claw 4, the movement of the wedge block 10 will push the anchor claw 4 to the inner wall of the center pipe, achieving stable anchoring.
[0036] In the process of unsealing, the center pipe is rotated again to apply a rotating force, which drives the upper connecting column 6 to continue moving. In this process, the center pipe will cut off the cutting block 8, so that a certain distance appears between the center pipe and the working barrel. The appearance of this distance enables the upper connecting column 6 to drive the wedge block 10 to rotate and dislocate. The dislocation of the wedge block 10 will make it from the inner wall of the anchor claw 4 to the side wall of the anchor claw 4. At this time, the anchor claw 4 starts to shrink through the dovetail connecting block 9 and the spring 7, and finally sticks to the outer wall of the upper connecting column 6, completing the unsealing process. This design not only ensures the stable anchoring of the tubing anchor in the well, but also realizes fast and reliable unsealing, improves the operation efficiency and safety.
[0037] Working principle: In the use of reverse tubing anchor, first screw the upper connecting pipe 3 in one end of the center pipe, then drive the tubing anchor down, and then reach the designated position, seal the pipeline through the obturator 1, then rotate the center pipe to drive the upper connecting pipe 3 to move, then move the upper connecting column 6 to move, then the outer wall of the wedge block 10 will be driven to move, and at the same time, due to the slope design, the outer wall of the anchor claw 4 will be stuck to the inner wall of the center pipe for stable anchoring. Then, in the process of unsealing, the center pipe is rotated again to apply a rotating force, which drives the upper connecting column 6 to continue moving. In this process, the center pipe will cut off the cutting block 8, so that a certain distance appears between the center pipe and the working barrel. The appearance of this distance enables the upper connecting column 6 to drive the wedge block 10 to rotate and dislocate. The dislocation of the wedge block 10 will make it from the inner wall of the anchor claw 4 to the side wall of the anchor claw 4. At this time, the anchor claw 4 starts to shrink through the dovetail connecting block 9 and the spring 7, and finally sticks to the outer wall of the upper connecting column 6, completing the unsealing process. This design not only ensures the stable anchoring of the tubing anchor in the well, but also realizes fast and reliable unsealing, improves the operation efficiency and safety.
[0038] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.
Claims
1. A reverse tubing anchor, characterized by, The utility model relates to a sealing device (1) for sealing a working barrel (2) of a wellbore (3) and a method for sealing a working barrel (2) of a wellbore (3). The sealing device (1) is used for sealing a working barrel (2) of a wellbore (3). The lower connecting pipe (2) is used for connecting the sealing device (1) and the lower connecting column (5). The upper connecting column (6) is used for connecting the wedge-shaped block (10).
2. The reverse tubing anchor of claim 1, wherein: The upper connecting column (6) is fixedly connected with the upper connecting pipe (3) at one end.
3. The reverse tubing anchor of claim 1, wherein: The wedge-shaped block (10) is arranged on the side wall of the dovetail connecting block (9).
4. The reverse tubing anchor of claim 3, wherein: The spring (7) is fixedly connected to the inner wall of the upper connecting column (6) at one end and to the bottom of the dovetail connecting block (9) at the other end.
5. The reverse tubing anchor of claim 1, wherein: The dovetail connecting block (9) is fixedly connected with the fluke (4) on the side wall.
6. The reverse tubing anchor of claim 5, wherein: The fluke (4) is arranged in the inner part of the lower connecting column (5). The lower connecting column (5) is fixedly connected with the lower connecting pipe (2) at one end.