TTGM-4 special thread structure oil casing coupling

Abstract

The invention discloses a TTGM-4 special thread structure oil casing coupling. Conical buttress coupling internal threads are arranged at two ends of a coupling, the coupling is provided with a coupling torque shoulder, conical coupling sealing surfaces are arranged at the tail ends of the coupling internal threads, the coupling is connected with an oil casing body, conical buttress casing body external threads are arranged at two ends of the casing body, the casing body is provided with a casing body torque shoulder, conical casing body sealing surfaces are arranged at the tail ends of the casing body external threads, the casing body external threads are engaged and screwed with the coupling internal threads, the taper of the conical casing body sealing surfaces is as same as that of the conical coupling sealing surfaces, the conical casing body sealing surfaces and the conical coupling sealing surfaces are in interference fit from roots to arc portions, and the casing body torque shoulder contacts with the coupling torque shoulder. Compared with the prior art, the TTGM-4 special thread structure oil casing coupling has the advantages that fine sealing effects can be achieved, and an anti-torque function can be effectively achieved when torque is applied by external force.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment for oil exploitation, and relates to the casing screw connection technology of the drilling equipment, in particular to a TTGM-4 special thread structure oil casing coupling. Background technique [0002] With the sharp increase in the world's demand for fossil energy and the decrease in the amount of oil that can be recovered year by year, the current oil exploration field is gradually developing in the direction of deep wells, ultra-deep wells, high-pressure oil and gas wells, heavy oil thermal recovery wells, and directional wells. As a result, more and more stringent technical requirements are put forward for the sealing between oil pipes and pipes. In the past, API (American Petroleum Institute) standard round thread and buttress thread joints cannot meet the needs of oil and gas wells with harsh environmental conditions in terms of air tightness, connection strength and corrosion ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a TTGM-4 special thread structure oil casing coupling to solve the problem of using API (American Petroleum Institute) standard round thread and partial trapezoidal thread in the prior art when exploiting oil and gas wells with harsh environmental conditions. Threaded joints cannot meet the problems of oil and gas wells with harsh environmental conditions in terms of air tightness, connection strength and corrosion resistance

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