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A kind of low-alloy corrosion-resistant oil casing material and preparation method thereof

A technology for corrosion oil and low alloy, applied in the field of low alloy corrosion resistant oil casing material and its preparation, to achieve the effect of excellent comprehensive performance and good carbon dioxide corrosion resistance

Active Publication Date: 2021-11-16
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the high alloy content of the existing nickel-based alloy oil casing material and the CO resistance of the low alloy oil casing material 2 corrosion and H 2 S stress corrosion ability needs to be further improved, the present invention provides a low-alloy corrosion-resistant oil casing material and its preparation method

Method used

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  • A kind of low-alloy corrosion-resistant oil casing material and preparation method thereof
  • A kind of low-alloy corrosion-resistant oil casing material and preparation method thereof
  • A kind of low-alloy corrosion-resistant oil casing material and preparation method thereof

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Embodiment 1

[0036] The embodiment of the present invention provides a low-alloy corrosion-resistant oil casing material, the chemical composition of which is:

[0037] C 0.15%, Si 0.20%, Mn 0.6%, Cr 3.2%, Mo 0.7%, V 0.07%, Al 0.03%, P0.01%, S 0.0009%, the rest is Fe and unavoidable impurities.

[0038] The preparation steps of the above-mentioned low-alloy corrosion-resistant oil casing material are as follows:

[0039] Steel-making raw materials are smelted in an 80t electric arc furnace, ladle refined, VD vacuum degassed, and continuous casting to produce a φ180mm continuous casting round billet with the same chemical composition as the above-mentioned oil casing material; the continuous casting round billet is heated by an annular furnace, Piercing to make capillary tubes of φ199.1mm×15.7mm, capillary tubes are rolled by a precision cross-rolling unit to obtain raw tubes of φ198.7mm×8.56mm, and raw tubes are made into rolled steel pipes of φ177.8mm×9.19mm by micro-tension reduction ; ...

Embodiment 2

[0048] The embodiment of the present invention provides a low-alloy corrosion-resistant oil casing material, the chemical composition of which is:

[0049] C 0.18%, Si 0.35%, Mn 0.5%, Cr 2.8%, Mo 0.8%, V 0.04%, Al 0.04%, P0.008%, S 0.001%, the rest is Fe and unavoidable impurities.

[0050] The preparation steps of the above-mentioned low-alloy corrosion-resistant oil casing material are as follows:

[0051] Steel-making raw materials are smelted in an 80t electric arc furnace, ladle refined, VD vacuum degassed, and continuous casting to produce a φ180mm continuous casting round billet with the same chemical composition as the above-mentioned oil casing material; the continuous casting round billet is heated by an annular furnace, Piercing to make capillary tubes of φ199.1mm×15.7mm, capillary tubes are rolled by a precision cross-rolling unit to obtain φ198.5mm×12.1mm barren tubes, and barren tubes are made into rolled steel pipes of φ177.8mm×12.65mm by micro-tension reduction...

Embodiment 3

[0060] The embodiment of the present invention provides a low-alloy corrosion-resistant oil casing material, the chemical composition of which is:

[0061] C 0.2%, Si 0.15%, Mn 0.4%, Cr 3.0%, Mo 0.9%, V 0.06%, Al 0.01%, P0.006%, S 0.0007%, the rest is Fe and unavoidable impurities.

[0062] The preparation steps of the above-mentioned low-alloy corrosion-resistant oil casing material are as follows:

[0063] Steel-making raw materials are smelted in an 80t electric arc furnace, ladle refined, VD vacuum degassed, and continuous casting to produce a φ210mm continuous casting round billet with the same chemical composition as the above-mentioned oil casing material; the continuous casting round billet is heated by an annular furnace, Piercing to make capillary tubes of φ228.1mm×31.6mm, capillary tubes are rolled by a precision cross-rolling unit to obtain barren tubes of φ227.8mm×25.2mm, and barren tubes are made into rolled steel pipes of φ205mm×26mm by micro-tension reduction; ...

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Abstract

The invention discloses a low-alloy corrosion-resistant oil casing material and a preparation method thereof. The composition weight percentages of the low-alloy corrosion-resistant oil casing material are: 0.15%≤C≤0.20%, 0.15%≤Si≤0.35%, 0.4%≤Mn≤0.6%, 2.8%≤Cr≤3.2%, 0.7%≤Mo≤0.9%, 0.04%≤V≤0.07%, 0.01%≤Al≤0.04%, P≤0.01%, S≤0.002%, The balance is Fe and unavoidable impurities. The present invention successfully prepares the compound that can contain H 2 S and CO 2 The oil casing material used in ultra-deep oil wells with two corrosive gases, and the alloy elements in the material are greatly reduced, which significantly reduces the production cost of the oil casing material.

Description

technical field [0001] The invention relates to the technical field of oil casing manufacturing, in particular to a low-alloy corrosion-resistant oil casing material and a preparation method thereof. Background technique [0002] At present, the underground gas storages built in the world are generally buried within 2000m. The average completion depth of the Suqiao underground gas storage group is generally around 5000m, and the deepest has reached 5505m. Ultra-deep is followed by ultra-high temperature and ultra-high pressure production conditions, which will bring a series of challenges to the deep structure of injection-production wells and injection-production strings. The original oil and gas reservoirs of Suqiao underground gas storage group contain 2.31% CO 2 Gas, injected gas containing 2.37% CO 2 Gas needs to be taken out of the stored formation water during the injection and production process, which will inevitably cause metal corrosion of the oil casing. Suqia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C21D1/78C21D6/00C21D8/10C21D9/08B21B23/00
CPCB21B23/00C21D1/78C21D6/002C21D6/005C21D6/008C21D8/105C21D9/08C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24
Inventor 邓叙燕
Owner DALIPAL PIPE