Heat treatment process of drill rod pipe body

Abstract

The invention discloses a heat treatment process of a drill rod pipe body. The heat treatment process of the drill rod pipe body comprises quenching and tempering heat treatment according to the following steps and process parameters: (1) quenching: (a) the drill rod pipe body is conveyed into a stepper quenching furnace which is heated to 880-930 DEG C, and is insulated by 40-60 minutes; and (b)after the drill rod pipe body is discharged from the furnace, the drill rod pipe body enters quenching liquid of 10-30 DEG C within 15 seconds, and the quenching time is not shorter than 30 seconds; and (2) tempering: the drill rod pipe body is conveyed into a stepper tempering furnace which is heated to 560-590 DEG C, is insulated by 60-85 seconds, is discharged from the furnace, and is naturallycooled to the room temperature. As the heat treatment process of the drill rod pipe body is adopted, the impact performance of a drill rod is excellent, and exceeds a standard value of a V150 steel stage by above 30%; the mechanical indexes, such as strength and ductility of the heated drill rod pipe body meet the requirements of the V150 steel stage, and the pass percent is above 98%; and the heat treatment process of the drill rod pipe body is reasonable in heat treatment operation step and process parameter.

Description

technical field [0001] The invention relates to a heat treatment process for a pipe body, in particular to a quenching and tempering process for manufacturing a drill pipe body with relatively high mechanical properties, so that it can reach the standard of V150 steel grade. Background technique [0002] Petroleum drill pipe is the main tool for oil field drilling, and its structure includes the drill pipe body and the drill pipe joints at both ends of the drill pipe body. In the process of oil and gas extraction and refining, the drill pipe body must be able to withstand huge internal and external pressure, twisting, bending and vibration. [0003] With the continuous development of the petroleum industry, more and more deep wells and ultra-deep wells have been developed, which puts forward higher and higher requirements for drill pipes. At present, the highest strength of API series drill pipes is S135 steel grade, but with the increase of drilling depth, the strength req...

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Problems solved by technology

At present, the heat treatment process disclosed in China is difficult to meet the technical requirements of V150 steel grade drill pipe, especially the tensile properties of the drill pipe body after heat treatment cannot meet the requirements, and the relevant heat treatment process has not been reported abroad.

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