Sleeve joint structure

Abstract

The invention relates to the technical field of oil well sleeves, and discloses a sleeve joint structure. The sleeve joint structure comprises a sleeve body and an adaptive sleeve matched with the sleeve body. An external thread with the taper of 1:16 is arranged on the outer surface of one end of the sleeve body, an internal thread matched with the external thread is arranged on the inner surface of the end, matched with the sleeve body, of the adaptive sleeve, and the external thread and the internal thread are in interference fit. An outer circular bead face is arranged at one end of the sleeve body, and an inner circular bead face matched with the outer circular bead face is arranged on the adaptive sleeve. The external thread and the internal thread are both buttress threads, the toot height of the buttress threads ranges from 1.775 mm to 1.975 mm, the thread pitch of the buttress threads ranges from 3 threads per inch to 4 threads per inch, the angle of a guide face is 30+/-2.5 degrees, and the angle of a bearing face ranges from 0 to 1 degree. According to the sleeve joint structure, wrong thread buckling or fast screwing on can be avoided, good sealing performance is achieved, connecting strength is high, drilling and production efficiency is improved, drilling and production cost is reduced, and the threads can be effectively prevented from failing or slipping.

Description

technical field [0001] The invention relates to the technical field of oil well casing, in particular to a casing joint structure. Background technique [0002] With the development of my country's oil and gas fields, the amount of drilling and production engineering is increasing day by day, the well conditions are getting worse and worse, and the oil and gas drilling and production operations are developing towards more stringent working conditions. The continuous improvement of oil drilling and production technology has increased the production of deep wells, thermal recovery wells, high-pressure gas wells, directional wells, and wells containing hydrogen sulfide. However, the ordinary API (American Petroleum Institute Standard) threaded casing is not easy to buckle, slow to make up, and takes a long time to tighten, which seriously affects the working efficiency. At the same time, the sealing performance is poor and the connection strength is not high; thread failure and...

AI Technical Summary

Problems solved by technology

The continuous improvement of oil drilling and production technology has increased the production of deep wells, thermal recovery wells, high-pressure gas wells, directional wells, and wells containing hydrogen sulfide. However, the ordinary API (American Petroleum Institute Standard) threaded casing is not easy to buckle, slow to make up, and takes a long time to tighten, which seriously affects the working efficiency. At the same time, the sealing performance is poor and the connection strength is not high; thread failure and slippage often occur. problems, in many cases difficult to meet production demands

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