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Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof

An oil casing and stress corrosion technology, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of reducing hydrogen sulfide stress corrosion resistance, excessive addition of alloy elements, and reducing the plasticity and toughness of oil casings.

Inactive Publication Date: 2011-03-23
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the separate control of various alloying elements, it is easy to add excessive amounts of alloying elements, resulting in excessive equivalent carbon content, which reduces the plasticity and toughness of oil casings, and reduces the hydrogen sulfide stress corrosion resistance of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The specific process of manufacturing oil casing with a size of 244.5×11.99mm is as follows:

[0075] 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: 0.15%, S: 0.15%, Mn: 0.76 %, Cr: 0.35%, Mo: 0.40%, Al: 0.025%, Ti: 0.016%, V: 0.070%, Nb: 0.005%, Ca: 0.0018%, Mg: 0.0015%, B: 0.0013%, P: 0.010 %, S: 0.002%, N: 0.0034%, and the balance is iron. The A value is 0.5053%.

[0076] The above-mentioned high-purity molten steel is continuously cast into a round billet. The cooled continuous casting slab is heated in the annular heating furnace, the heating temperature of the tube blank is 1190 ℃, the heat centering temperature is 1120 ℃, and the Mannesmann method is used for hot piercing, limited mandrel rolling and reducing rolling , the final rolling temperature of continuous ro...

Embodiment 2

[0090] The specific process of manufacturing oil casing with a size of 244.5×11.99mm is as follows:

[0091] 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: 0.14%, Si: 0.32%, Mn: 0.66 %, Cr: 0.41%, Mo: 0.71%, Al: 0.025%, Ti: 0.013%, V: 0.12%, N: 0.0041%, Nb: 0.005%, Ca: 0.0013%, Mg: 0.00185%, B: 0.0012 %, P: 0.008%, S: 0.001%, N: 0.0027%, and the balance is iron. The A value is 0.5907%.

[0092]The above-mentioned high-purity molten steel is continuously cast into a round billet. The cooled continuous casting slab is heated in the annular heating furnace, the heating temperature of the tube blank is 1190°C, the heat centering temperature is 1140°C, and the Mannesmann method is used for hot piercing, limited mandrel rolling and reducing rolling , the final rolling temperature of c...

Embodiment 3

[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, 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: 0.13%, Si: 0.37%, Mn: 0.71 %, Cr: 0.38%, Mo: 0.49%, Al: 0.021%, Ti: 0.018%, V: 0.10%, Nb: 0.0045%, Ca: 0.0027%, Mg: 0.0025%, B: 0.0019%, P: 0.007 %, S: 0.001%, N: 0.0012%, and the balance is iron. The A value is 0.5113%.

[0107] The above-mentioned high-purity molten steel is continuously cast into a round billet. The cooled continuous casting slab is heated in the annular heating furnace, the heating temperature of the tube blank is 1190°C, the heat centering temperature is 1140°C, and the Mannesmann method is used for hot piercing, limited mandrel rolling and reducing rolling , the final rolling temperature of continuous r...

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Abstract

The invention discloses a petroleum casing pipe with sulfurated hydrogen stress corrosion resistance and a producing method thereof, which aims to proceed from improvement on purity and tensile ratio of steel, tempered martensite proportion, grain refinement, remained stress reduction and other aspects, and provide the petroleum casing pipe with high obdurability and sulfurated hydrogen stress corrosion resistance and the production method thereof. The petroleum casing pipe comprises the following compositions in weight percentage: 0.12 to 0.18 percent of C, 0.10 to 0.60 percent of Si, 0.05 to 1.0 percent of Mn, 0.20 to 1.0 percent of Cr, 0.10 to 0.80 percent of Mo, 0.005 to 0.05 percent of Al, 0.005 to 0.02 percent of Ti, 0.05 to 0.15 percent of V, 0.002 to 0.02 percent of Nb, 0.0003 to 0.005 percent of Ca, 0.0003 to 0.005 percent of Mg, 0.0003 to 0.003 percent of B, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of N, and the balance being Fe, wherein the weight percentages of carbon, manganese, chromium and molybdenum are determined by a comprehensive control formula, that is A is equal to the sum of percentage of C, percentage of Mn divided by 5,percentage of Cr divided by 5, and percentage of Mo divided by 3, and the range of A is between 0.45 and 0.60 percent.

Description

technical field [0001] The invention belongs to the technical field of manufacturing seamless steel pipes in the metallurgical industry, and in particular relates to a hydrogen sulfide stress corrosion-resistant petroleum casing and a manufacturing method thereof. Background technique [0002] Hydrogen sulfide is contained in the oil and gas reservoirs of Sichuan, Changqing, North China and Xinjiang in China, as well as the oil fields of Baroma in the United States and Pincher Bay in Canada. According to statistics, about 1 / 3 of the oil and gas fields in the world contain hydrogen sulfide gas. When ordinary oil casing is used in the exploitation of oil and gas resources containing hydrogen sulfide, under the joint action of stress and hydrogen sulfide gas, the oil casing will often suffer from brittle fracture suddenly when the stress is much lower than its yield strength. In the lighter case, the casing string or the entire well will be scrapped, and in the severe case, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C21C5/52B21B1/46C21D9/08
CPCY02P10/20
Inventor 李连进付继成孙开明王惠斌宗卫兵张传友
Owner TIANJIN UNIV OF COMMERCE
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