Special-thread gas seal oil sleeve joint for ultra-deep wells
A special thread, air-tight technology, used in casings, drill pipes, drilling equipment, etc., can solve the problems of galling, torque shoulder shear failure, and uneven thread stress distribution in threaded joints. , to prevent yield failure, enhance the effect of fatigue resistance
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[0020] The oil casing joint of the present invention is composed of a pipe body part A and a coupling part B. The joint is composed of a three-stage auxiliary seal (-15° angle torque shoulder 1, right angle torque shoulder 2, right angle torque shoulder 4), two-stage The main seal (cone surface / cone surface sealing structure 3, spherical surface / cone surface sealing structure 5), relief groove 6, connecting thread 7, deformation release space 8 and so on. The spherical surface of the first main seal is on the male buckle, and the radius of the spherical surface is 40mm~60mm; the second main seal adopts a variable cone structure, the taper of the female buckle is 1:10, and the taper of the male buckle is 1:8; deformation release The radius of the outer transition arc of the space is 1.2mm, and the radius of the inner transition arc is 0.6mm; the thread is a new type of thread structure designed based on the partial trapezoidal thread, and its guiding surface is the 5° partial tra...
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