High efficiency torsion resistant drill rod joint with good sealing performance

Abstract

The invention relates to a high efficiency torsion resistant drill rod joint with good sealing performance. The drill rod joint consists of an externally threaded part and an internally threaded part, wherein the internally threaded part contains an outer shoulder surface, a long and straight cylindrical bore, an internal thread, a conical bore, a cylindrical bore, a semicircular convex and an inner shoulder surface; and the externally threaded part contains a first outer shoulder surface, a stress-relief groove, a long and straight cylindrical bore, an external thread, a cylndrical surface and a second outer shoulder surface. The total torsional strength of the joint depends on the distance between the combination part of the shoulder surface and the long and straight cylindrical bore in the internally threaded part and the combination part of the cylndrical surface and the shoulder surface in the externally threaded part. After the internal thread and the external thread are meshed, the effect of reducing the maximum stress can be well realized. The drill rod joint has good connection strength and sealing performance and superior torsion resistance ability; the maximum stress and the stress distribution of the drill rod joint can be effectively improved; and the drill rod joint is particularly suitable for the extraction of petroleum and natural gas.

Description

technical field [0001] The invention relates to a drill pipe joint for oil and natural gas development, in particular to a high-efficiency torsion-resistant drill pipe joint with good sealing performance, belonging to the technical field of oil well pipe thread connection. Background technique [0002] Traditional drill pipe joints are generally produced in accordance with the structural form specified in API SPEC 7. There is no other pair of shoulder surfaces that form a fit between the internal threaded part and the external threaded part of this joint. When drilling, the joint part will be subjected to a large torque, and most of the force generated by the applied load is borne by the first few teeth of the threaded part, which is prone to failure accidents, and the actual use shows that the stress of this joint is extremely high. If the value is large, the stress concentration phenomenon is very serious, and the sealing performance is also very limited, so it is not suit...

AI Technical Summary

Problems solved by technology

These patents take into account the torsion resistance of the drill pipe joint, and increase the inner diameter channel of the drill pipe joint, but do not pay attention to the combination of the torsion resistance of the joint and the shear resistance of each thread, that is, the shear on the thread The stress cannot be greater than the totality of the joint, otherwise it will lead to failure conditions, and the sealing performance of these joints is insufficient

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