High strength sulfur resisting casing pipe and its heat treatment manufacturing method

A high-strength, quenched and tempered heat treatment technology, applied in heat treatment furnaces, heat treatment equipment, casings, etc., can solve the problems of materials and other issues, achieve the effects of reducing production costs, excellent hydrogen sulfide corrosion resistance, and reducing the amount of alloy used

Active Publication Date: 2012-03-14
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention solves the material problem of high-strength hydrogen sulfide corrosion-resistant oil casing for ultra-deep wells containing sulfur by proposing a heat treatment manufacturing method for high-strength sulfur-resistant casing

Method used

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  • High strength sulfur resisting casing pipe and its heat treatment manufacturing method
  • High strength sulfur resisting casing pipe and its heat treatment manufacturing method
  • High strength sulfur resisting casing pipe and its heat treatment manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] According to the chemical composition in Table 1, it is smelted, poured and rolled, and then the first quenching and tempering treatment is carried out. Among them, the heating temperature before quenching is 930 ° C, kept for 45 minutes, and quenched with water. The tempering temperature is 570°C, heat preservation for 90min, and air cooling after being out of the furnace. Then carry out the second quenching and tempering treatment, wherein, the heating temperature before quenching is 850°C, heat preservation for 45min, and water spray quenching. Tempering temperature is 650°C, heat preservation for 90 minutes, and air cooling after being out of the furnace.

[0036] Table 1, the chemical composition of the embodiment of the present invention and comparative example, wt%

[0037] C

Embodiment 2

[0039] Carry out smelting, pouring and rolling according to the chemical composition in Table 1, and then perform the first quenching and tempering treatment, in which, the heating temperature before quenching is 1000°C, heat preservation for 120min, and water spray quenching. The tempering temperature is 650°C, heat preservation for 150min, and air cooling after being out of the furnace. Then carry out the second quenching and tempering treatment, wherein, the heating temperature before quenching is 950°C, keep warm for 120min, and quench with water. The tempering temperature is 710°C, heat preservation for 150min, and air cooling after being out of the furnace.

Embodiment 3

[0041] Carry out smelting, pouring and rolling according to the chemical composition in Table 1, and then perform the first quenching and tempering treatment, in which the heating temperature before quenching is 930°C, hold for 45min, and quench with water. The tempering temperature is 570°C, heat preservation for 90min, and air cooling after being out of the furnace. Then carry out the second quenching and tempering treatment, wherein, the heating temperature before quenching is 950°C, keep warm for 120min, and quench with water. The tempering temperature is 710°C, heat preservation for 150min, and air cooling after being out of the furnace.

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Abstract

The invention relates to a high strength sulfur resisting casing pipe, which comprises the following chemical components: 0.25-0.35 wt% of C, 0.1-0.5 wt% of Si, 0.4-0.6 wt% of Mn, 0.1-0.6 wt% of Cr, 0.2-0.6 wt% of Mo, 0.03-0.15 wt% of V, less than 0.015 wt% of P, less than 0.010 wt% of S, and the balance Fe as well as inevitable impurity elements. In the invention, when a steel pipe is rolled, a quenching and tempering heat treatment is carried out twice. The quenching and tempering heat treatment comprises the steps of: during the first quenching and tempering heat treatment, keeping a heating temperature of 900DEG C-1000DEG C before quenching, conducting heat preservation for 45min-120min, then spraying water for quenching, and carrying out tempering at a temperature of 670DEG C-710DEG C, performing thermal insulation for 90min-150min, air cooling the pipe when taken out of a furnace; during the second tempering treatment, keeping a heating temperature of 850DEG C-950DEG C before quenching, conducting heat preservation for 45min-120min, then spraying water for quenching, and carrying out tempering at a temperature of 650DEG C-710DEG C, performing thermal insulation for 90min-150min, and air cooling the pipe when taken out of the furnace.

Description

technical field [0001] The invention relates to an economical high-strength hydrogen sulfide-resistant seamless oil casing and a heat treatment manufacturing method thereof. Background technique [0002] Hydrogen sulfide is an acidic gas that is often encountered in oil and gas exploration and extraction. As the world's energy demand continues to grow, oil and gas resources that are less difficult to develop are gradually exhausted, and people have to start developing deep and ultra-deep wells with harsher geological conditions, and these oil and gas wells often contain hydrogen sulfide gas. About 1 / 3 of the world's existing oil and gas fields contain hydrogen sulfide gas. [0003] Sour hydrogen sulfide gas in oil and gas wells will cause sulfide stress corrosion cracking (Sulfide Stress Cracking) in steel materials. This problem is particularly prominent in high strength low alloy steel (High Strength Low Alloy Steel, HSLA). Since the hydrogen sulfide corrosion resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21D9/08E21B17/01
Inventor 潘大刚王磊
Owner BAOSHAN IRON & STEEL CO LTD
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