An oil pipe anchor for pressure setting in oil sleeve annulus

Abstract

The invention discloses a tubing-casing annulus pressurizing setting tubing anchor, and relates to the technical field of oilfield downhole tools. The tubing-casing annulus pressurizing setting tubinganchor comprises an upper joint, a lower joint, a central pipe, and an anchoring mechanism, a spring claw is machined at the upper end of a slip sleeve, the spring claw is hooked to the lower end ofthe slip setting piston sleeve to connect the anchoring mechanism as a whole, the slip setting piston sleeve and the central pipe are connected through a positioning dowel to integrally connect the integrated anchoring mechanism to the central pipe, and the slip setting piston sleeve is provided with a liquid passing hole used for introducing pressure into a piston cavity. According to the tubing-casing annulus pressurizing setting tubing anchor, the structure of the anchoring mechanism is improved, after an oil pipe is heated and stretched, the positioning dowel is sheared by stress, and after being sheared, the anchoring mechanism as a whole can slide freely on the central pipe so as to adapt to thermal expansion and contraction; and in this telescopic mechanism, the central pipe is directly used as a telescopic slide pipe, and thus the adverse effect brought by reduction of the diameter of a pipe column is eliminated.

Description

technical field [0001] The invention belongs to the technical field of oilfield downhole tools, and in particular relates to an oil pipe anchor for pressing and setting an oil casing annulus. Background technique [0002] In the oilfield production process, the tubing anchor is an essential downhole tool. During construction, the tubing anchor is connected to the tubing string and lowered into the casing. Then, the slip setting piston in the tubing anchor moves under pressure and pushes the cone to move by pressing, and then the slip on the tubing anchor is moved. The shoe (anchor fluke) is supported, and the supported slip is against the inner wall of the casing to anchor the tubing string on the casing. In oil wells using thermal recovery technology, the tubing string will elongate after being heated, but the anchor point of the traditional tubing anchor remains unchanged. issues such as reduction. In order to solve the above problems, a new type of oil pipe anchor is d...

AI Technical Summary

Problems solved by technology

In order to solve the above problems, a new type of oil pipe anchor is disclosed in the prior art. A slide tube is arranged inside the center pipe of this oil pipe anchor, and the slide pipe and the center pipe can slide relatively within a certain range, so that the oil pipe extends After a long time, it can be extended downwards, thereby eliminating the adverse effects caused by the bending of the tubing. However, the sliding pipe and the center pipe of this oil pipe anchor are independent of each other. Adding a sliding pipe to the original center pipe will greatly reduce the overhang The liquid path (the liquid path is reduced by at least 10mm), which will undoubtedly have an adverse effect on the implementation of other processes such as oil well logging

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