Highly anti-torque drill rod

Abstract

The invention relates to a highly anti-torque drill rod which is characterized by comprising a drill rod body (1), wherein an external thread (2) is arranged on the periphery of a pin small end of the drill rod body (1); an internal thread (3) is arranged on the inner wall of a box big end of the drill rod body (1); the external threads (2) and the internal threads (3) of two adjacent drill rods are meshed so as to connect the two drill rods; step surfaces are arranged at the upper and lower ends of the external thread (2) and the upper and lower ends of the internal thread (3) of the drill rod body (1); the steps at the lower end of the external thread (2) and the lower end of the internal thread (3) are main shoulders (4); and the steps at the upper end of the external thread (2) and the upper end of the internal thread (3) are auxiliary shoulders (5). The highly anti-torque drill rod provided by the invention can guarantee accurate realization of interference fit between the main shoulders and the thread section; the auxiliary shoulders also bear some load in a working state and realize certain overload protection effect; and moreover, the anti-torque intensity of the drill rod can be improved, and the safety of the drill rod is guaranteed.

Description

technical field [0001] The invention relates to a high torsion-resistant drill pipe, which belongs to the technical field of petroleum drill pipes. Background technique [0002] Drill pipe is used in drilling for oil, gas, water and mineral deposits. Drill pipes are connected by drill pipe joints. During normal rotation, the drill pipes must bear the effects of internal and external pressure, axial force, bending moment and torque at the same time. [0003] However, the torsional strength of ordinary drill pipes is not high. After long-term use, failure accidents of drill pipe joints will occur frequently, making it the main form of drill pipe failure. Therefore, the current drill pipe joints urgently need to be able to transmit greater torque to adapt to various complex working environments. Contents of the invention [0004] The object of the present invention is to overcome the above-mentioned disadvantages and provide a high-torsion-resistant drill pipe with high str...

AI Technical Summary

Problems solved by technology

[0003] However, the torsional strength of ordinary drill pipe is not high. After long-term use, failure accidents will occur frequently in the drill pipe joint, making it the main form of drill pipe failure.

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