Recoverable anchoring mechanism in casing pipe

Abstract

The invention provides a recoverable anchoring mechanism in a casing pipe. The recoverable anchoring mechanism comprises a body assembly, a slip assembly, a driving execution mechanism and a locking mechanism, wherein the slip assembly, the driving execution mechanism and the locking mechanism are installed on the body assembly. The slip assembly is located on the side face of the body assembly, and the slip assembly can move in the direction deviating from the axis of the body assembly to protrude out of the side face of the body assembly under driving of the driving execution mechanism. The locking mechanism can prevent the slip assembly from moving towards the axis direction of the body assembly. When in use, the device penetrates into a casing pipe, the slip assembly, the driving execution mechanism and the locking mechanism are arranged on the body assembly, and the slip assembly forms pressure on the inner wall of the casing pipe by adopting the action of the driving execution mechanism on the slip assembly, so that the locking mechanism fixes the position of the slip assembly; the slip assembly generates large static friction between the slip assembly and the inner wall of the sleeve so as to achieve anchoring. When anchoring needs to be relieved, the slip assembly is loosened, no lateral pressure exists on the inner wall of the casing pipe, and anchoring is relieved; the product can be repeatedly used.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling equipment, in particular to a retrievable casing inner anchoring mechanism with the feature of preventing accidental rotation or axial movement. Background technique [0002] During oil or gas drilling and completion, such as figure 1 As shown, it is very important to complete relevant downhole operations to securely fix the downhole tools, including the anchoring mechanism in the casing, in the casing, and to be able to release the anchor when necessary. It is very important for the successful completion of the casing window opening operation to ensure that the guide is very reliably fixed in the casing and can be reliably released when necessary. [0003] With the existing anchoring tools, the unreliable anchoring often causes the rotation or movement of the oblique device, resulting in the failure of opening the window. The unreliable factors of the seat hanger mainly include sev...

AI Technical Summary

Problems solved by technology

[0003] The existing anchoring tools often have unreliable anchoring, causing the rotation or movement of the oblique device, resulting in the failure of window opening

The unreliable factors of the seat hanger mainly include several points. First, the structure of the slips is unreasonable. In order to meet the characteristics of releasable anchors, some tools only have axial one-way slips, so they can only move downwards.

When an upward force is applied, it is easy to accidentally release the anchor, and the tool moves up, causing the anchor to fail

Slips without anti-rotation function will cause the rotation of the anchoring mechanism, resulting in the rotation of the tools connected to it, resulting in the failure of related operations

The second is the lack of self-locking mechanism or the self-locking mechanism is unreliable; resulting in the rotation or movement of the anchoring mechanism

Third, the design of the occlusal surface of slips is unreasonable

The existing tools on the market do not consider non-concentricity in the design process of the slips, resulting in partial occlusal of the slips, resulting in unreliable anchoring

[0004] In addition, the existing anchoring tools can only be used once and then be scrapped, and cannot be reused, resulting in a great waste of resources, neither energy saving nor environmental protection

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