Fast screwing variable pitch superhigh anti-torsion drill pipe joint

Abstract

The invention relates to a fast screwing variable pitch superhigh anti-torsion drill pipe joint which is mainly composed of a male joint and a female joint and is characterized in that a female jointthread tooth, a female joint primary shoulder, a female joint primary shoulder surface, a female joint secondary shoulder and a female joint secondary shoulder surface are processed on the female joint; a male joint thread tooth, a male joint primary shoulder, a male joint primary shoulder surface, a male joint secondary shoulder and a male joint secondary shoulder surface are processed on the male joint; the male joint thread tooth and the female joint thread tooth are meshed for connecting the male joint and the female joint; the male joint primary shoulder is in contact with the female joint secondary shoulder; the male joint secondary shoulder is in contact with the female joint primary shoulder; the taper of each of the joint thread teeth is (1:8)-(1:2); the number of turns of each ofthe female joint thread tooth and the male joint thread tooth is 5 to 8; and the screw pitch variable quantity of each of the female joint thread tooth and the male joint thread tooth is 0.1-1mm. Thefast screwing variable pitch superhigh anti-torsion drill pipe joint is suitable for the working condition of excessive torque of a drill pipe and frequent trip operation and can effectively improvethe torsional behavior and the screwing and unscrewing speeds of the drill pipe joint.

Description

technical field [0001] The invention relates to a drill pipe joint used for oil and natural gas drilling, which is a fast make-up variable pitch ultra-high torsion-resistant drill pipe joint. Background technique [0002] Drill strings are connected through drill pipe joints to provide passages for ground power equipment and downhole drilling tools for oil and gas drilling. Due to the complexity of its structure, the thread of the drill pipe joint has become a weak link. Under the combined load, the tool joint is more prone to failure. [0003] In recent years, horizontal wells and extended-reach wells have developed rapidly. During drilling operations of extended-reach wells and horizontal wells, the borehole curvature is large and the horizontal section is long, and the frictional torque on the drill pipe increases sharply. The thread of the joint often breaks and fails. Once the thread of the drill pipe joint fails, the fishing will be stopped, which is time-consuming an...

AI Technical Summary

Problems solved by technology

However, the processing of deformed trapezoidal thread teeth is too complicated and requires high processing

Patents 204877303U, 204060543U, etc. disclose a drill pipe joint that can improve torsional performance and make-up speed, but its torsional performance and make-up speed are limited

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