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Process for heat treatment of tube body of drill rod

A drill pipe and process technology, which is applied to the field of heat treatment of the pipe body, can solve the problems that the tensile properties of the drill pipe body cannot meet the requirements, it is difficult to meet the technical requirements of the V150 steel grade drill pipe, and the heat treatment steps are simple, The effect of good impact performance and reasonable process parameters

Inactive Publication Date: 2010-07-21
CNPC BOHAI EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The drill pipe body of a certain company is used, and its chemical composition is C: 0.26, Cr: 0.98, Mo: 0.64, V: 0.005, Si: 0.22, Mn: 0.75, Cu: 0.03, S: 0.001, P: 0.008, The balance is Fe, and the unit is mass percent. Follow the steps below for heat treatment:

[0023] ①Quenching

[0024] a. Transport the drill pipe body to a step-by-step quenching furnace whose temperature is raised to 910°C, and keep it warm for 60 minutes;

[0025] b. After the drill pipe body comes out of the furnace, it enters the quenching liquid at 23°C within 15 seconds. The quenching liquid is tap water and rotates at a rate of 88 rpm. The quenching time is 40 seconds, and the temperature of the quenching liquid is adjusted by the cooling tower. , The drill pipe body rotates at a certain speed for rapid and uniform quenching to form a fine and uniform grain structure.

[0026] ② Tempering

[0027] Within 1 hour of quenching, the drill pipe body is transported to a step-by-step tempering f...

Embodiment 2

[0043] The drill pipe body of a certain company is used, and its chemical composition is: C: 0.26, Cr: 0.97, Mo: 0.70, V: 0.004, Si: 0.21, Mn: 0.74, Cu: 0.03, S: 0.001, P: 0.008, The balance is Fe, and the unit is mass percent.

[0044] ①Quenching

[0045] a. Transport the drill pipe body to a step-by-step quenching furnace whose temperature is raised to 930°C, and keep it warm for 50 minutes;

[0046] b. The drill pipe body enters the quenching liquid at 30°C within 15 seconds after it comes out of the furnace. The quenching liquid is water, and it rotates at a rate of 100 rpm, and the quenching time is 35 seconds.

[0047] ② Tempering

[0048] Within 3 hours of quenching, the drill pipe body is transported to a step-by-step tempering furnace heated to 590°C and kept for 60 minutes; then the drill pipe body is taken out of the furnace and air-cooled to room temperature.

[0049] After the above heat treatment steps, the mechanical properties of the drill pipe body are as f...

Embodiment 3

[0058] The drill pipe body of a certain company is used, and its chemical composition is: C: 0.26, Cr: 0.94, Mo: 0.60, V: 0.004, Si: 0.22, Mn: 0.75, Cu: 0.03, S: 0.001, P: 0.008, The rest is Fe,

[0059] The unit is mass percent.

[0060] ①Quenching

[0061] a. Transport the drill pipe body to a step-by-step quenching furnace whose temperature is raised to 880°C, and keep it warm for 40 minutes;

[0062] b. The drill pipe body enters the quenching liquid at 12°C within 15 seconds after it comes out of the furnace. The quenching liquid is tap water, and it rotates at a rate of 70 rpm, and the quenching time is 60 seconds.

[0063] ② Tempering

[0064] Within 4 hours of quenching, the drill pipe body is transported to a step-by-step tempering furnace heated to 560°C, and kept for 85 minutes; then the drill pipe body is taken out of the furnace and air-cooled to room temperature.

[0065] After the above heat treatment steps, the mechanical properties of the drill pipe body are...

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Abstract

The invention discloses a process for heat treatment of the tube body of a drill rod, which comprises quenching and tempering heat treatment. The process comprises the following steps with the following process parameters: (1) quenching: a, conveying the tube body of the drill rod to a stepping quenching furnace with the temperature rising to be 880-930 DEG C, and keeping the temperature for 40-60 minutes; b, taking the tube body of the drill rod out of the furnace and placing the tube body of the drill rod into quenching solution with the temperature being 10-30 DEG C within 15 seconds, wherein the quenching time is no less than 30 seconds; and (2) tempering: conveying the tube body of the drill rod to a stepping tempering furnace with the temperature rising to be 560-590 DEG C, keeping the temperature for 60-85 minutes, taking the tube body of the drill rod out of the furnace, and naturally cooling the tube body of the drill rod to the room temperature. When the invention is applied, the impact performance of the drill rod is good and is 30 percent above the V150 steel grade standard; the strength, elongation rate and other mechanical indicators of the tube body of the drill rod after heat treatment meet the V150 steel grade requirements, and the qualification rate is higher than 98 percent; and the operating steps and process parameters of the heat treatment of the invention are reasonable.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/18C21D1/60
Inventor 钱强刘聪姜荣凯周秋芬刘荣王青林王建民李竹滨张树田伍国巍
Owner CNPC BOHAI EQUIP MFG
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