Thermal processing method for H2S-corrosion-resistant tool joint for petroleum drill pipe

Abstract

The invention discloses a tool joint for petroleum drill pipe against erosion of sulfureted hydrogen and a heat treatment method thereof. The tool joint is made of the steel pipe comprising the following ingredients (wt%): C: 0.3-0.4; Si: 0.1-0.5; Mn: 0.4-1.0, Cr: 0.3-1.2, Mo: 0.4-1.0; V: 0.05-0.15; Nb: 0.04-0.1; Ti: 0.01-0.1; Cu: 0.1-0.4; Ni:0.1-0.4; P<=0.010; S<=0.005, the rests are Fe and unavoidable impurities. The heat treatment method of the tool joint comprises the steps of: heating the whole to 850-1000 DEG C and then cooling in an oil tank, after that, tempering at AC1 temperature which is over 680 DEG C and lower than the material. The invention not only guarantees the sufficient quenching of the tool for drill pipe, but also not produce quenching crack with outstanding performance resisting sulphur.

Description

technical field

[0001] The invention relates to a high-performance hydrogen sulfide-resistant oil drill pipe tool joint and a heat treatment method thereof. Background technique

[0002] The traditional main process of producing sulfur-resistant drill pipe is: thicken the two ends of the hot-rolled seamless steel pipe according to the required size, and then perform overall quenching and tempering heat treatment to make a qualified drill pipe body. After the tube blank is hot punched, it is made into a tool joint blank, which is then subjected to rough machining and overall heat treatment. After the heat-treated tool joint and the drill pipe body are connected by friction butt welding, they are welded and heat-treated, and finally processed into oil drill pipes by proper machining.

[0003] As far as the tool joint of sulfur-resistant drill pipe is concerned, its thickness generally reaches 30-50 mm, which is much higher than that of the pipe body. In addition, it also has ...

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