High anti-extrusion special threaded casing connection joint

Abstract

The invention relates to a high-extrusion resistance special threaded connection joint for sleeve pipes. The High-extrusion resistance special threaded connection joint for the sleeve pipes comprises a coupling and pipe bodies which are in threaded connection; an inner step cylindrical surface is arranged in the middle of the inner wall of the coupling; standard buttress inner threads are processed at two ends of the coupling; the rear ends of the buttress inner threads are provided with inner knuckle threads; standard buttress outer threads are processed at the ends of the pipe bodies; the front ends of the buttress outer threads are provided with outer knuckle threads; inner torsion circular beads are arranged on two end faces of the inner step cylindrical surface, and outer torsion circular beads are arranged between the ends of the pipe bodies; the end faces of the inner torsion circular beads are recessed inward to form inner circular bead corners; and the end faces of the outer torsion circular beads are protruded outward to form outer circular bead corners. According to the high-extrusion resistance special threaded connection joint, the ends of the standard buttress threads are provided with the knuckle thread sealing structures, and a circular bead sealing structure of metal and metal is provided, so that the connection intensity of the joint is enhanced, and the extrusion resistance performance, the sealing performance, the bending resistance capacity, the compression resistance load capacity and the torsion resistance performance are improved.

Description

technical field [0001] The invention relates to an oil well pipe threaded joint used in the petroleum industry, in particular to a special threaded casing joint with high extrusion resistance. Background technique [0002] The oil and casing in the oil well pipe industry is mainly connected by threaded joints to form an oil and casing string with a length of several kilometers. Among them, the connection strength, sealing performance, bending resistance, torque resistance and tensile load of the threaded joints The quality of performance directly affects the connection quality of oil well pipes. Different geological structures require different types of threaded oil well pipes to meet the requirements of use. [0003] With the continuous development of oil field exploitation, the requirements for threaded joints of oil well pipes are becoming more and more stringent, especially the requirements for the main performance indicators of oil well pipes are getting higher and hig...

AI Technical Summary

Problems solved by technology

The existing API (American Petroleum Institute) partial trapezoidal thread joints have shortcomings such as weak torque resistance, low connection strength, poor sealing performance, and poor collapse resistance.

Oil well pipe processing enterprises in the world are constantly innovating on threaded joints, and different thread structure connection forms have appeared, but they still cannot meet the requirements of oil field production.

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