Telescopic tail pipe seat

Abstract

The invention relates to a telescopic tail pipe seat. The telescopic tail pipe seat comprises a body, an upper back ring, a lock ring sleeve, an annular seat hanging step and a lower back ring. The body is of a cylindrical hollow structure. The upper end and the lower end of the body are correspondingly sleeved with the upper back ring and the lower back ring. The upper back ring and the lower back ring are connected together by the lock ring sleeve. The upper end of the lock ring sleeve is fixedly connected with the upper back ring and the upper end of the body. The lower end of the lock ringsleeve is fixedly connected with the lower back ring and the lower end of the body. An extrusion mechanism is arranged in a space formed by the lock ring sleeve, the upper back ring, the lower back ring and the body. A support mechanism is arranged in a space formed by the lock ring sleeve, the upper back ring, the lower back ring and the body. The annular seat hanging step is located between theextrusion mechanism and the support mechanism and can be partially disengaged from an opening part in the side wall of the body and enters the internal space of the body under the appropriate condition. The telescopic tail pipe seat is suitable for being used under multiple environments, and the well cementing quality is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas well cementing tools, in particular to a telescopic liner seat. Background technique [0002] Oil and gas wells usually need to use a liner hanger for liner suspension or interlayer isolation during cementing and completion operations. Usually, the liner hanger needs to hang a corresponding number of lower casings. After being lowered to the designated position in the downhole, the liner hanger needs to be mounted by suppressing the pressure in the pipe, and the liner hanger is mounted by means of the mounting tool. seal so that it is anchored to the casing wall. Traditional liner hangers often fail to mount and cause the position of the liner hanger to move or fail to lose the hand, resulting in the inability to take out the center tube of the hanger, which fails to meet the purpose of construction requirements and affects the progress of the project. Especially in horizontal wells,...

AI Technical Summary

Problems solved by technology

The traditional liner hanger often fails to mount the liner hanger, resulting in the position of the liner hanger moving or losing the hand, resulting in the center tube of the hanger being unable to be taken out, which fails to meet the purpose of construction requirements and affects the progress of the project

Especially in horizontal wells, high-deviation wells, extended-reach wells or ultra-deep wells, where it is not convenient to transmit torque, high pressure, and high load suspension, the traditional liner hanger mounting method can no longer meet the requirements of on-site construction.

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