Machining process of high-performance adapter for drill stem

Abstract

The invention discloses a machining process of a high-performance adapter for a drill stem. The machining process mainly comprises the following steps of preparation of an alloy structural steel smooth blank, heat treatment of an alloy structural steel bar body and machining of the inner shape and the outer shape of the adapter. The mechanical properties of the high-performance adapter processed according to the process are superior to those of domestic and overseas petroleum industry standards. When the adapter bears tension, compression, bending and torsional loads underground, an inner shoulder and an outer shoulder play a role as well, the stress sectional area of threads is increased, the threaded connection strength and the torsional strength of the adapter can be improved, and the probability of piercing leakage of a sealing face can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of petroleum drilling, and in particular relates to a processing technology of a high-performance conversion joint for a drill string. Background technique [0002] As a fast drilling tool, the drill string is widely used in the field of oil drilling. The drill string generally includes kelly, drill pipe, drill collar and some downhole tools. These oil drilling tools need to be fixed with adapters, so the performance of adapters will directly affect the efficiency of drilling operations. In recent years, with the development of oilfield development towards deep wells, ultra-deep wells and directional drilling, due to the increasingly harsh working environment of drilling operations, higher requirements have been put forward in terms of resistance to low temperature and torsion resistance, and the materials used in conventional conversion joints, and It is not the most ideal material. Although the impact toughness of ...

AI Technical Summary

Problems solved by technology

In recent years, with the development of oilfield development towards deep wells, ultra-deep wells and directional drilling, due to the increasingly harsh working environment of drilling operations, higher requirements have been put forward in terms of resistance to low temperature and torsion resistance, and the materials used in conventional conversion joints, and It is not the most ideal material. Although the impact toughness of some conversion joints can reach more than 80J through the improvement of the heat treatment process, the comprehensive mechanical properties are not high and the reliability is not strong.

For deep wells, complex geological conditions, high-input wells that are difficult to exploit, and offshore oil wells with high fault handling costs, the failure rate is high and accidents occur frequently

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