FIELD: oil and gas industry.
SUBSTANCE: gas-tight threaded connection of tubing string includes coupling and nipple parts, on which there are thrust trapezoidal taper thread with conicity of 1:16. Connection is made with sealing unit formed by contacting between each other end face surfaces made on coupling and nipple and located at angle 6° to axial thread line. On the sleeve there is a protective belt for redistribution of radial loads on the body of the coupling and prevention of thread snacking, which is a channel with a smooth wall, which is a continuation of the side wall of the cone of the support conical trapezoidal thread, the generatrix of which is drawn along the recesses of this thread. Channel extends outward from the outer thread turn by 5–7 mm.
EFFECT: invention is intended for gas-tight threaded connection of tubing string.
1 cl, 3 dwg
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