Downhole torque control tool for milling operation

Abstract

The invention provides a downhole torque control tool for milling operation. The downhole torque control tool for the milling operation comprises a body which is a tubular body provided with through holes in the circumferential direction, each through hole is provided with a torque anchor palm which is in clearance fit with the through hole, the torque anchor palms are perpendicular to the axial direction of the body, the anchoring end of each torque anchor palm is provided with anchor teeth and a counter bore which are parallel to the axial direction of the body, a stretchable spring is arranged in each counter bore, a pressing plate is arranged at the lower ends of the stretchable springs, and the pressing plate is fixedly connected with the body; the end size of the other end of each torque anchor palm is larger than the inner diameter of the top of the corresponding through hole. According to the downhole torque control tool for the milling operation, drill pressure fluctuation brought by deformation of an operation tubular column in a shaft due to the fact that the operation tubular column bears inverted torque is effectively avoided, on the premise of not affecting the axial movement of the operation tubular column, the safety risks brought by tubular column tripping and reverse twisting of the tubular column on the shaft head are decreased, power torque output by a screw motor is stably controlled on a front section milling tool, the drilling grinding stability is improved, and the milling efficiency is improved.

Description

technical field [0001] The invention specifically relates to a downhole torque control tool for grinding and milling operations, which is especially suitable for horizontal well milling operations, and can realize downhole control of counter torque, and eliminate in-hole tripping of pipe strings and reversal of wellhead pipe strings. Background technique [0002] In conventional grinding and milling operations, when the downhole pipe string produces a small reaction torque, the reaction torque is mainly eliminated by the metal friction between the pipe string itself and the inner wall of the casing, and the risk of pipe string tripping is small; when the downhole pipe string produces a large With large anti-torque, the pipe string reverses in the wellbore, and at the same time, the exposed pipe string at the upper part of the wellhead also reverses, which is mainly controlled by the wellhead anti-torque control device to eliminate the anti-torque. [0003] However, there is ...

AI Technical Summary

Problems solved by technology

[0003] However, there is a high risk of simple wellhead anti-torque control devices; reliable wellhead anti-torque control devices are more complicated, and wellhead operations are more difficult; when the anti-torque cannot be released slowly, there is a risk of string tripping; When passing through the pipe string to the milling tool, the efficiency loss is greater due to the longer pipe string, which affects the milling efficiency

Currently, there are no downhole tools for anti-torque control

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