H2S-corrosion-resistant tool joint for petroleum drill pipe and hot treatment method thereof

A heat treatment method and tool joint technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as quenching cracks, poor quenching effect, and loss of medium, and achieve high hardenability and excellent sulfur resistance. Effect

Active Publication Date: 2008-10-01
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the medium concentration is too high, the quenching effect will not be good; if the concentration is too low, the medium effect will be lost and quenching cracks will appear
At the same time, in the continuous production process, the medium will be lost, and the concentration of the medium needs to be monitored at any time, which brings certain difficulties to stable production.

Method used

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  • H2S-corrosion-resistant tool joint for petroleum drill pipe and hot treatment method thereof

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Embodiment

[0052] The present invention respectively adopts seamless steel pipes with the alloy compositions listed in Table 3, and rough-processes them to obtain No. 4, No. 5, No. 6, No. 7, and No. 8 tool joints. Then adopt the process of heating the tool joints as a whole to a temperature of 850-1000°C, quenching and cooling in an oil tank as a whole, and then tempering at 680-720°C to carry out overall heat treatment on No. 4-8 tool joints respectively.

[0053] The Cr-Mo-V steel used in No. 4-8 tool joints prepared by the present invention is compared with the Cr-Mo steel commonly used in common tool joints. The chemical composition comparison is shown in Table 3.

[0054] Table 3 Comparison of chemical composition of test steel

[0055] Numbering

C

Si

mn

Cr

Mo

V

Nb

Ti

Remark

1

0.27

0.21

0.58

1.04

0.29

0.07

Comparison steel

2

0.29

0.19

1.41

0.94 ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D9/00C21D1/18C21D11/00E21B17/02
Inventor 殷光虹于杰郭金宝朱世忠
Owner BAOSHAN IRON & STEEL CO LTD
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