Drill rod centralizer

Abstract

The invention discloses a drill rod centralizer. The drill rod centralizer comprises a centralizing wing, an upward flow channel and a through hole, wherein a conical part is arranged in the through hole in a sealing fit mode, and the conical part is connected with the hole wall of the through hole through a first shear pin; the drill rod centralizer further comprises a sliding sleeve, the slidingsleeve is connected to the inner wall of the centralizer in a sealing mode, a one-way valve is arranged at the bottom of the sliding sleeve, and the sliding sleeve is connected with the centralizer through a second shear pin; a first pressurizing flow channel and a second pressurizing flow channel are formed in the inner wall of the centralizer, and a third pressurizing flow channel is further formed in a sliding push block; when the sliding sleeve moves downwards to a low stroke position, the upper end of the first pressurizing flow channel is located outside the sliding sleeve; when the sliding push block moves downwards to the low stroke position, the second pressurizing flow channel communicates with the third pressurizing flow channel; and a plurality of spiral blades are further arranged at the end, away from the pointed cone end, of the conical part. The drill rod centralizer is used for solving the problem that in the prior art, a drill rod centralizer is prone to mud drum andthen underground accidents are induced, and the purposes of providing a self-unblocking function for the drill rod centralizer and reducing the risk of jamming of a drill by the mud drum of the centralizer are achieved.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a drill pipe centralizer. Background technique [0002] Drilling engineering is an important intermediate link in the process of oil and gas extraction, and drill pipe is one of the essential tools. The drill pipe centralizer is a very important drilling tool in the downhole drilling tool assembly. Its main functions are: (1) Centralize the bottom hole assembly, improve the centering degree of the bottom hole assembly in the wellbore, and reduce the pressure difference and sticking of the drill pipe , the risk of sticking and stuck pipe; (2) as a part of the pendulum drilling tool assembly in the vertical well drilling operation, it plays the purpose of preventing deviation and straightening and improving the verticality of the wellbore; In the process of downhole or even horizontal well operation, as a lever fulcrum for directional deflection, it plays a key role in controll...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a drill pipe centralizer to solve the problem in the prior art that the drill pipe centralizer is prone to mud bagging and thus induce downhole accidents, to realize the self-blocking function for the drill pipe centralizer and to reduce the mud bag of the centralizer Purpose of stuck pipe risk

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