THREADED CONNECTION FOR THICK-WALLED PIPE PRODUCTS OF THE OILFIELD CASING AND TUBULAR GOODS

摘要

FIELD: oil and gas industry.;SUBSTANCE: surface of the nipple part (3), forming the sealing portion (13) is convex, and the surface of the sleeve (1), forming the sealing portion (11) is conical. At the nipple part (3), the thickness t_s of the nipple part is assumed equal 15 mm or less, the coefficient t_s/D of the form (where D is the outer diameter of the pipe section without the nipple part) is assumed to be 0.045 or more, and the full-length thread ratio L/t (where L is the length of the nipple part with full thread, t is the wall thickness of the pipe section without the nipple part) is taken to be 4.0 or less.;EFFECT: tightness, prevention of scoring in a state of simultaneous exposure to high external pressure and high compressive stress.;3 cl, 1 tbl, 5 dwg