Long thick wall petroleum drilling and mining steel pipe heat treatment technique

A technology of oil drilling and steel pipe, applied in the field of medium frequency induction heat treatment process, can solve the problems of high production cost and difficulty in meeting the standard requirements, and achieve the effect of reasonable process parameters

Inactive Publication Date: 2008-04-30
XIANYANG HENGTONG DRILLING EQUIP MFG
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The production of oil drilling and production steel pipes in my country started late, and the production cost is high according to the conventional heat treatment process, and it is difficult to meet its standard requirements. The product qualification rate is only about 60%. At present, there is no intermediate frequency for oil drilling and production steel pipes in China The process of induction heat treatment has not been reported abroad

Method used

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Examples

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Embodiment Construction

[0018] The present invention will be further described below by the example of the oil drill collar processed to a certain group company.

[0019] The material is 4145H, the specification is 172mm in diameter and 9500mm in length.

[0020] (1) Clean the oil drill collar and put it on the medium frequency induction quenching and heating machine tool;

[0021] (2) The parameters of the intermediate frequency power supply are intermediate frequency voltage 750V, intermediate frequency frequency 160HZ, and power 560KW;

[0022] (3) The machine tool runs continuously at 250mm per minute;

[0023] (4) Heating the oil drill collar to 890°C;

[0024] (5) The workpiece is quenched when it is 650mm away from the furnace mouth;

[0025] (6) The quenching water temperature is 35°C;

[0026] (7) After the oil drill collar is quenched, the temperature is 120°C and then directly enters the medium frequency induction tempering heating machine tool;

[0027] (8) The parameters of the temp...

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PUM

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Abstract

The invention provides a heat treatment technology for a long-thick wall petroleum drilling steel pipe. The invention comprises quenching and a tempering heat treatment technology. Firstly, the surface of the petroleum drilling steel pipe is cleaned, and oil stain can not exist on the surface; then quenching is performed under the intermediate frequency to be below 200 Hz, the quenching hardness reaches more than HRC48, and the tempering is performed on the petroleum drilling steel pipe within 4 hours after being quenched; during tempering, the intermediate frequency power source frequency is adjusted at 100 Hz. The adoption of the technical proposal ensures that the heat treatment operation steps and the technology parameters are reasonable and normative, the product satisfies the mechanical property requests such as hardness degree, the strength, the extensibility degree, the contraction percentage and the impact energy to a drilling rod connector issued by the department of the petroleum industry, and the qualified rate reaches more than 95 percent.

Description

technical field [0001] The invention relates to a medium-frequency induction heat treatment process for long bars and long thick walls, in particular to a heat treatment process for long thick wall oil drilling and production steel pipes. Background technique [0002] The oil drill pipes and oil drill collars used in the oil drilling industry need to be rotated in complex geological conditions thousands of meters deep, carrying a lot of bending force and load deformation, so the drilling and production steel pipes must be made of high-quality carbon alloy steel According to the standard requirements, its mechanical properties such as hardness, strength and toughness are very high, so the heat treatment process in the production process is very important. The production of oil drilling and production steel pipes in my country started late, and the production cost is high according to the conventional heat treatment process, and it is difficult to meet its standard requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/18E21B17/00
Inventor 徐平安
Owner XIANYANG HENGTONG DRILLING EQUIP MFG
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