TTGM-7 directly-connected special thread structure oil casing

Abstract

The invention discloses a TTGM-7 directly-connected special thread structure oil casing which comprises an internal thread front sealing surface, an internal thread, an internal thread rear sealing surface, an external thread rear sealing end surface, an external thread and an external thread front sealing end surface. The external thread is provided with an external thread anti-torque end surface, the internal thread is provided with an internal thread anti-torque shoulder, the external thread is engaged with a trapezoidal thread of the internal thread in the tightening process, the internal thread rear sealing surface hermetically contacts with the external thread front sealing end surface, the internal thread front sealing surface hermetically contacts with the external thread rear sealing end surface, the external thread anti-torque end surface and the internal thread anti-torque shoulder are completely aligned, and an internal thread stress release groove is formed in the thread tail of the internal thread. The TTGM-7 directly-connected special thread structure oil casing can effectively function in well cementation, well repair, torsion resistance and perforation in the secondary development process of a waste well and is simple, reasonable and safe and convenient to use, and fine sealing effects can be effectively achieved by a double-seal structure.

Description

technical field [0001] The invention relates to an oil casing device, in particular to a TTGM-7 direct connection oil casing with special thread structure. Background technique [0002] In the process of oil development, there are many old wells and dead wells. Due to the outer diameter and coupling of conventional casings, it is difficult to meet the development of old wells, which is a great waste of national property. [0003] In view of this, a TTGM-7 direct connection oil casing with special thread structure is provided to meet the needs of the development of abandoned wells. Contents of the invention [0004] The purpose of the present invention is to provide a TTGM-7 direct-connected special threaded oil casing to solve the problem of many old wells and dead wells in the oil development process. Difficult to meet the development of waste wells, according to the problem of a great waste of state property. [0005] In order to achieve the purpose of the present inve...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a TTGM-7 direct-connected special threaded oil casing to solve the problem of many old wells and dead wells in the oil development process. Difficult to meet the development of abandoned wells, which will cause a huge waste of national property

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