Treatment method for welding zone of high-performance sulfur-resisting drill pipe body and joint

Abstract

The invention discloses a treatment method for a welding zone of a high-performance sulfur-resisting drill pipe body and a joint, which comprises the following steps: respectively carrying out overall quenched-tempered heat treatment on the pipe body and the joint with the same components, and then connecting the pipe body and the joint into a whole by friction welding; carrying out medium-frequency induction heating on the welding zone to 300 DEG C-600 DEG C, then carrying out stress-relief annealing, turning flashing and burrs, and carrying out post-welding heat treatment; carrying out medium-frequency induction heating on the welding zone to 780 DEG C-900 DEG C, preserving the temperature for 3-30 minutes, and then carrying out spray quenching by using a quenching medium of 20 DEG C-40 DEG C; carrying out medium-frequency induction heating on the welding zone to 690 DEG C-750 DEG C, preserving the temperature for 5-30 minutes, and then carrying out spray cooling by using a quenching medium of 20 DEG C-40 DEG C; and carrying out medium-frequency induction heating on the welding zone to 600 DEG C-700 DEG C, preserving the temperature for 5-30 minutes, and then air cooling to room temperature. After the drill pipe is treated by the method, the cracking-resisting capacity of the welding zone is improved, and the welding zone has appropriate strength, toughness, lower hardness and even distribution, thereby avoiding loss caused by sulfide stress corrosion cracking of the drill pipe.

Description

technical field [0001] The invention relates to a treatment method for a drill pipe welding zone, in particular to a treatment method for a high-performance sulfur-resistant drill pipe body and joint welding zone. Background technique [0002] With the increasingly harsh conditions of oil extraction, sour oil and gas fields have become a hot spot in recent years. Hydrogen sulfide in sour oil and gas fields often leads to sulfide stress corrosion cracking of drill pipes produced in accordance with API standards, and often causes brittle fractures suddenly, resulting in Huge economic loss. For this reason, the drill pipe that can be used in the environment containing hydrogen sulfide must not only meet the requirements of the API standard for conventional performance, but also have excellent resistance to sulfide stress corrosion cracking. This type of drill pipe is called sulfur-resistant drill pipe. [0003] At present, there is no uniform standard for sulfur-resistant dril...

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Problems solved by technology

[0003] At present, there is no uniform standard for sulfur-resistant drill pipes at home and abroad, and the performance levels of sulfur-resistant drill pipes produced by various manufacturers are not consistent

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