High strength and ductility oil casing with hydrogen sulfide corrosion resistance and manufacturing method for oil casing

A technology of oil casing and high strength and toughness, which is applied in the metallurgical field, can solve the problems of low impact resistance of oil casing, affect the service life, easy to appear cracks, etc., achieve excellent resistance to hydrogen sulfide stress corrosion, and refine grains. The effect of organization and improvement of strength

Inactive Publication Date: 2012-08-01
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low impact resistance of oil casing, under the action of external load, it is prone to cracks, breakage, flattening and deformation, etc., which affects the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] The specific process of manufacturing oil casing with a size of 244.5×11.99mm is as follows:

[0106] Sponge iron and scrap steel are used as raw materials for steelmaking, and melted into molten steel in an electric arc furnace. After refining outside the furnace and vacuum degassing, the chemical composition of the molten steel obtained is: C: 0.20%, Si: 0.18%, Mn: 0.51 %, Cr: 0.68%, Mo: 1.44%, Al: 0.02%, Ti: 0.017%, V: 0.07%, Nb: 0.011%, Ca: 0.0031%, B: 0.0015%, P: 0.011%, S: 0.001 %, N: 0.005%, and the balance is iron.

[0107] 12V+1-Mo=12×0.07+1-1.44=0.4

[0108] Mo-(Cr+Mn)=1.44-(0.68+0.51)=0.25.

[0109] The above-mentioned high-purity molten steel is continuously cast into a tube blank. Heat the cooled tube billet in an annular heating furnace, the tube billet heating temperature is 1215°C, heat preservation for 11 hours, the heat centering temperature is 1140°C, the Mannesmann method is used for hot piercing, the hot piercing temperature is 1070°C, and the li...

Embodiment 2

[0122] The specific process of manufacturing oil casing with a size of 244.5×11.99mm is as follows:

[0123] Sponge iron and scrap steel are used as raw materials for steelmaking, melted into molten steel in an electric arc furnace, and after refining outside the furnace and vacuum degassing, the chemical composition of the molten steel obtained is: C: 0.16%, Si: 0.15%, Mn: 0.52 %, Cr: 0.65%, Mo: 1.56%, Al: 0.02%, Ti: 0.004%, V: 0.08%, Nb: 0.006%, Ca: 0.0026%, B: 0.0012%, P: 0.010%, S: 0.003 %, N: 0.004%, and the balance is iron.

[0124] 12V+1-Mo=12×0.08+1-1.56=0.4

[0125] Mo-(Cr+Mn)=1.56-(0.65+0.52)=0.39.

[0126] The above-mentioned high-purity molten steel is continuously cast into a tube blank. Heat the cooled tube billet in an annular heating furnace. The tube billet heating temperature is 1215°C, heat preservation for 13 hours, and the heat centering temperature is 1140°C. Mannesmann method is used for thermal piercing. The final rolling temperature of moving mandr...

Embodiment 3

[0139] The specific process of manufacturing oil casing with a size of 244.5×11.99mm is as follows:

[0140] Sponge iron and scrap steel are used as raw materials for steelmaking, melted into molten steel in an electric arc furnace, and after refining outside the furnace and vacuum degassing, the chemical composition of the molten steel obtained is: C: 0.19%, Si: 0.19%, Mn: 0.53 %, Cr: 0.76%, Mo: 1.31%, Al: 0.04%, Ti: 0.040%, V: 0.07%, Nb: 0.008%, Ca: 0.0015%, B: 0.0013%, P: 0.008%, S: 0.002 %, N: 0.009%, and the balance is iron.

[0141] 12V+1-Mo=12×0.07+1-1.31=0.53

[0142] Mo-(Cr+Mn)=1.31-(0.76+0.53)=0.02.

[0143] The above-mentioned high-purity molten steel is continuously cast into a tube blank. Heat the cooled tube billet in an annular heating furnace. The tube billet heating temperature is 1210°C, heat preservation for 11 hours, the heat centering temperature is 1140°C, and the Mannesmann method is used for thermal piercing. The final rolling temperature of moving ma...

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Abstract

The invention discloses a high strength and ductility oil casing with hydrogen sulfide corrosion resistance and a manufacturing method for the oil casing, and aims to provide an oil casing with high impact resistance and capable of meeting the requirement for exploiting a deep oil-gas layer containing hydrogen sulfide gas and a manufacturing method for the oil casing. The oil casing consists of the following components in percentage by weight: 0.15 to 0.20 percent of C, 0.1 to 0.2 percent of Si, 0.4 to 0.6 percent of Mn, 0.6 to 0.8 percent of Cr, 1.2 to 1.6 percent of Mo, 0.01 to 0.05 percent of Al, 0.002 to 0.05 percent of Ti, 0.05 to 0.10 percent of V, 0.005 to 0.015 percent of Nb, 0.0003 to 0.005 percent of Ca, less than 0.002 percent of B, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.003 to 0.010 percent of N, and the balance of Fe, wherein the adding amount of Mo, V, Cr and Mn satisfies that 12V+1-Mo is more than or equal to 0 and Mo-(Cr+Mn) is more than or equal to 0. According to the oil casing, the content of manganese, chromium and molybdenum is controlled through a comprehensive control formula, and hydrogen sulfide corrosion resistance and impact ductility are improved by optimizing the content of each component.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a hydrogen sulfide-resistant high-strength toughness petroleum casing and a manufacturing method thereof. Background technique [0002] Hydrogen sulfide is contained in the oil and gas reservoirs of my country's Sichuan, Changqing, North China, Xinjiang and Jianghan oil fields, as well as oil fields such as Baroma in the United States and Pincher Bay in Canada. According to statistics, about 1 / 3 of the world's oil and gas fields contain hydrogen sulfide. hydrogen sulfide gas. [0003] When the ordinary casing is used for the exploitation of oil and gas resources containing hydrogen sulfide, under the action of stress and hydrogen sulfide gas, the casing will often be brittle suddenly when the stress is much lower than its own yield strength, and the lighter case will cause casing failure. If the pipe string or the whole well is scrapped, in severe cases, hydrogen sulfide and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/10
Inventor 李连进王惠斌宗卫兵
Owner TIANJIN UNIV OF COMMERCE
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