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High-strength drilling rod for petroleum and method for making same

A technology for oil drill pipe and manufacturing method, which is applied to drill pipe, drill pipe, drilling equipment, etc., can solve problems such as pipe body quenching and cracking, and achieve the effect of reducing cooling speed and cooling water volume

Active Publication Date: 2007-08-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the quenching hardness of the pipe end, it is necessary to increase the hardenability of the material, but when the hardenability of the material increases, the thinner pipe body may be quenched and cracked

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] See Table 2 for examples of the high-strength petroleum drill pipe of the present invention.

[0034] The manufacturing method of the present invention is as follows: Thicken the end of the steel pipe with the above components to make a pipe body of a thickened drill pipe; then heat the steel pipe as a whole at a heating temperature of 960°C, and then perform quenching and cooling treatment on the heated steel pipe, and then quench At a temperature of 900°C, the steel pipe is placed on a rotating quenching stand. While the steel pipe is rotating, water is sprayed on the inner surface with axial flow and the outer surface is cooled with laminar water; Control the different amount of water sprayed at the thickened end of the steel pipe and the pipe body, or reduce the amount of water sprayed at the pipe body, or increase the amount of water sprayed at the thickened end of the drill pipe, so that the pipe body and added water with different wall thicknesses The thick end i...

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Abstract

A high strength oil drilling rod, the constituent is (mass ratio): C 0.20 to 0.30 percent, Si 0.1 to 0.5 percent, Mn 0.7 to 1.5 percent, Cr 0.7 to 1.5 percent, Mo 0.1 to 0.4 percent, and the rest being Fe and inescapable impurity. The method for preparation includes: thickening the end of the related steel pipe to prepare the body-pipe of upset drilling rod; heating the whole steel pipe and cooling, lying on a rotating quenching stand, spraying water by axial-flow inside surface and spraying water by laminar flow outside surface when the steel pipe is rotating; by controlling the various amount of outer water delivered to the thickening end of the steel pipe and the body-pipe, or by decreasing the amount of outer water delivered to the body-pipe, or increasing the amount of outer water delivered to the thickening end of the steel pipe, makes the thickness-different pipe and the thickening end have the same cooling rate and the same quenching structure, and also have the same dynamic behavior after quenching.

Description

technical field [0001] The invention relates to a high-strength petroleum drill pipe and a manufacturing method thereof, in particular to the production of high-strength petroleum drill pipes of steel grade above S135. Background technique [0002] The main process of the traditional production of oil 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 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] For the drill pipe body, in order to ensure the strength after butt welding with the tool joint, the pipe end must be upset and thickened before being welded with the tool joint. The higher the steel grade of the drill pipe, the thicker the thickened end. At the same time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22E21B17/00
Inventor 殷光虹于杰孙元宁施青朱世忠
Owner BAOSHAN IRON & STEEL CO LTD
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