Rotation-prevention connecting structure for pipe column

Abstract

The invention relates to the technical field of drilling and completion of petroleum, natural gas, shale gas and coalbed methane, and particularly relates to a rotation-prevention connecting structure for a pipe column. According to the connecting structure, teeth processed at the lower end part of an upper joint of the connecting structure are meshed with teeth processed at the upper end part of a lower joint of the connecting structure; a step is processed on the inner wall of the lower end of a connecting sleeve, and is matched with an external step of the lower joint; the inner wall of the upper end of the connecting sleeve is in screwed connection with the outer wall of the upper joint. The connecting structure is good in rotation-prevention effect and high in strength, can realize reliable delivery of larger axial force of and torque of the pipe column, and can be conveniently adjusted and maintain the fixed angle connection when a certain angular difference is required for the upper structure and the lower structure of the pipe column; the defects that the conventional rotation-prevention manner cannot effectively prevent rotation and has high possibility of rotation errors caused on the pipe column and poor intensity difference are overcome.

Description

Technical field: [0001] The invention relates to the technical field of drilling and completion of petroleum, natural gas, shale gas and coalbed methane, in particular to a pipe string anti-rotation connection structure. Background technique: [0002] In the development process of oil and gas drilling and completion, various oil pipes or casings are often used for screw connection to transmit axial tensile force and certain torque. Especially in some special operations, such as the casing window operation, it is required that the pipe string connection transmits a large torque, and at the same time, the connection part needs to avoid the torsional misalignment of the upper and lower pipe strings under the action of a large torque. Most of the existing anti-rotation methods use threaded fasteners combined with welding or threaded fasteners to avoid rotation of the pipe string, and the anti-rotation effect is poor. At the same time, due to the existence of the welding transit...

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings that the existing anti-rotation methods cannot effectively prevent rotation, which may easily cause rotation errors and poor strength of the pipe string

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