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Low-alloy high-strength sulfur-resistant oil casing material and preparation method thereof

A low-alloy high-strength, oil-casing technology, applied in the field of oil-casing manufacturing, can solve problems such as the inability to meet the needs of oil and gas fields, and achieve the effects of improving the resistance to sulfide stress corrosion, reducing the burden of desulfurization, and eliminating tissue stress.

Active Publication Date: 2020-11-20
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the existing anti-sulfide stress corrosion oil casing materials cannot meet the needs of oil and gas fields, the present invention provides a low-alloy high-strength anti-sulfur oil casing material with excellent mechanical properties and corrosion resistance and a preparation method thereof

Method used

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  • Low-alloy high-strength sulfur-resistant oil casing material and preparation method thereof
  • Low-alloy high-strength sulfur-resistant oil casing material and preparation method thereof
  • Low-alloy high-strength sulfur-resistant oil casing material and preparation method thereof

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Embodiment 1

[0046] The embodiment of the present invention provides a low-alloy high-strength anti-sulfur oil casing material, the chemical composition of which is:

[0047] C 0.18%, Si 0.25%, Mn 0.4%, Cr 0.4%, Mo 0.8%, V 0.16%, Al 0.01%, P0.008%, S 0.002%, the rest is Fe and unavoidable impurities.

[0048] The preparation steps of the above-mentioned low-alloy high-strength sulfur-resistant oil casing material are as follows:

[0049] Steelmaking raw materials are smelted in an 80t electric arc furnace, ladle refining, VD vacuum degassing, and continuous casting to produce a continuous casting round billet with the same chemical composition as the above oil casing material; the continuous casting round billet is heated by an annular furnace and pierced. The capillary tubes and capillary tubes are rolled by a three-roller continuous rolling mill to obtain barren tubes. The barren tubes are stripped by a three-stand tube removal machine, reduced in micro tension, and cooled by a step-by-s...

Embodiment 2

[0056] The embodiment of the present invention provides a low-alloy high-strength anti-sulfur oil casing material, the chemical composition of which is:

[0057] C 0.2%, Si 0.35%, Mn 0.5%, Cr 0.2%, Mo 0.9%, V 0.12%, Al 0.02%, P0.01%, S 0.0018%, the rest is Fe and unavoidable impurities.

[0058] The preparation steps of the above-mentioned low-alloy high-strength sulfur-resistant oil casing material are as follows:

[0059] Using scrap steel as raw material, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting process, the continuous casting round billet with the same chemical composition as the above oil casing material is produced; the continuous casting round billet is heated and perforated by the ring furnace Made of capillary, the capillary is rolled by a three-roller continuous rolling mill to obtain a waste pipe, and the waste pipe is removed by a three-stand pipe removal machine, micro-tensioned, and cooled by a step-by-...

Embodiment 3

[0066] The embodiment of the present invention provides a low-alloy high-strength anti-sulfur oil casing material, the chemical composition of which is:

[0067] C 0.22%, Si 0.15%, Mn 0.6%, Mo 0.7%, V 0.18%, Al 0.04%, P 0.009%, S0.0016%, and the rest are Fe and unavoidable impurities.

[0068] The preparation steps of the above-mentioned low-alloy high-strength sulfur-resistant oil casing material are as follows:

[0069] Using scrap steel as raw material, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting process, the continuous casting round billet with the same chemical composition as the above oil casing material is produced; the continuous casting round billet is heated and perforated by the ring furnace Made of capillary, the capillary is rolled by a three-roller continuous rolling mill to obtain a waste pipe, the waste pipe is removed by a three-stand pipe removal machine, the micro tension is reduced, and the stepping ...

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Abstract

The invention discloses a low-alloy high-strength sulfur-resistant oil casing material and a preparation method thereof. The low-alloy high-strength sulfur-resistant oil casing material comprises thefollowing components in percentage by weight: C is more than and equal to 0.18% and less than and equal to 0.22%, Si is more than and equal to 0.15% and is less than and equal to 0.35%, Mn is more than and equal to 0.4% and less than and equal to 0.6%, Cr is less than and equal to 0.4%, Mo is more than and equal to 0.7% and less than and equal to 0.9%, V is more than and equal to 0.12% and less than and equal to 0.18%, Al is more than and equal to 0.01% and less than and equal to 0.04%, P is less than and equal to 0.01%, S is less than and equal to 0.002%, and the balance is Fe and inevitableimpurities. By adopting an optimal component design and the unique preparation process, the prepared oil casing material is small in inclusion harm and fine and uniform in structure, a large number oflow-angle grain boundaries exist, excellent mechanical properties and sulfide stress corrosion resistance are provided, and the oil casing material can be widely applied to exploitation of acid medium deep wells and ultra-deep well oil and gas wells, and is wide in market prospect.

Description

technical field [0001] The invention relates to the technical field of oil casing manufacturing, in particular to a low-alloy high-strength sulfur-resistant oil casing material and a preparation method thereof. Background technique [0002] According to statistics, about 1 / 3 of the world's proven oil and gas fields contain hydrogen sulfide gas, such as the Panama oil field in the United States and the Pincher Bay oil field in Alberta, Canada. my country's Sichuan, Changqing, Zhongyuan, North China, Tarim and other oil and gas fields all contain varying degrees of hydrogen sulfide gas. Among them, the geological conditions in the southwest region are complex, and the oil and gas burial depth is mostly at 4000-6000m. Contains H 2 The proportion of S is extremely high, and 80% of the gas fields contain H 2 S greater than 20mg / m 3 , up to 490g / m 3 . The leakage of crude oil and natural gas caused by corrosion in the process of oil and gas exploitation, storage and transporta...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C21D1/18C21D1/28C21D1/667C21D6/00C21D8/10C21D9/08C22C33/06
CPCC21D1/18C21D1/28C21D1/667C21D6/002C21D6/005C21D6/008C21D8/105C21D9/085C21D2211/009C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24
Inventor 邓叙燕
Owner DALIPAL PIPE
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