A self-centering rotary cutting tool

Abstract

The invention relates to a self-centering rotary cutting tool, which is characterized in that it includes an upper joint, a first shell and a second shell all of which are hollow structures, and the upper joint, the second shell and the first shell A combined cavity is formed, a plug is provided at the right end of the second housing, and three knife handle grooves are symmetrically arranged on the outer wall of the second housing, and a retractable knife handle is arranged in the knife handle groove; it also includes a core Shaft, the mandrel is inserted into the combined cavity, a reset ring is fixed on the mandrel, a first cavity is formed between the reset ring and the second housing, and the mandrel is provided with A first diversion hole and a second diversion hole, the first diversion hole communicates with the first cavity, and a second cavity is further provided between the mandrel and the plug. The beneficial effect of the present invention is that the cutting tool can be kept in the center, the risk of cutting off the oil pipe is reduced, and the outer layer oil and casing are protected.

Description

technical field [0001] The invention relates to the field of oil field equipment, in particular to a self-centering rotary cutting tool. Background technique [0002] In existing oilfield production, cutting tools are connected with oil pipes and drill pipes, and the rotation of oil pipes and drill pipes drives the cutting tools to rotate to realize the cutting of oil and casing. Due to the limitation of oil pipe and drill pipe size, the cutting tool cannot realize the cutting of small diameter oil pipe. On the other hand, due to the limitation of oil pipe and drill pipe length, the lowering speed of the cutting tool is slow, and the cutting efficiency is low. [0003] With the development of new techniques and technologies for downhole operations, there are more and more cases where pipe strings get stuck and cannot be released. The stuck locations are often concentrated in the horizontal section. On the other hand, the inner diameter of the stuck pipe string is getting sm...

AI Technical Summary

Problems solved by technology

Due to the limitation of tubing and drill pipe size, cutting tools cannot realize the cutting of small diameter tubing

On the other hand, due to the limitation of the length of tubing and drill pipe, the lowering speed of the cutting tool is slow, and the cutting efficiency is low

[0003] With the development of new techniques and technologies for downhole operations, there are more and more cases where pipe strings get stuck and cannot be released. The stuck locations are often concentrated in the horizontal section. On the other hand, the inner diameter of the stuck pipe string is getting smaller and smaller. Unable to cut with tubing, drill pipe connection cutting tools

The existing conventional solution is to use chemical, blasting and other cutting methods to cut and release the jammed pipe string, which can easily cause damage to the outer oil and casing, and affect the continuous production of oil and gas wells in the later stage

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