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Method for increasing stress corrosion resistance of Fe-Ni-based anticorrosion alloy oil well pipe

A technology of corrosion-resistant alloys and corrosion performance, which is applied in the field of corrosion-resistant alloy processing and metal materials, can solve problems such as economic loss and safety hazards, stress corrosion, stress corrosion cracking failure, etc., to reduce development costs and improve stress corrosion cracking resistance performance effect

Active Publication Date: 2019-01-18
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, H in sour oil and gas environments 2 The synergistic effect of corrosive media such as S and the high stress state of the pipe makes it have a significant stress corrosion tendency, which can easily lead to stress corrosion cracking failure, resulting in huge economic losses and safety hazards

Method used

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  • Method for increasing stress corrosion resistance of Fe-Ni-based anticorrosion alloy oil well pipe
  • Method for increasing stress corrosion resistance of Fe-Ni-based anticorrosion alloy oil well pipe
  • Method for increasing stress corrosion resistance of Fe-Ni-based anticorrosion alloy oil well pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The chemical composition (mass percentage) of the iron-nickel-based corrosion-resistant 028 alloy is as follows:

[0026] C 0.012%

[0027] Si 0.23%

[0028] Mn 0.74%

[0029] P 0.018%

[0030] S 0.001%

[0031] Cr 27.2%

[0032] Ni 31.3%

[0033] Mo 3.7%

[0034] Cu 1.1%

[0035] The balance is Fe and other unavoidable impurities.

[0036] Using the above alloys, the iron-nickel-based corrosion-resistant 028 alloy P110 grade oil well pipes were prepared through the following steps and schemes, and made into the first category:

[0037] (1) Prepare a blank tube with an outer diameter of 250mm and a wall thickness of 25mm by hot extrusion;

[0038] (2) A cold-rolled pipe with an outer diameter of 219 mm and a wall thickness of 16 mm was prepared by using a 350-type Pilger cold rolling mill;

[0039] (3) The chamber-type annealing furnace heated by natural gas is annealed at 1210±5°C for 75±5 minutes by heating with the furnace;

[0040] (4) Use a 350-type Pilg...

Embodiment 2

[0055] The chemical composition (mass percentage) of the iron-nickel-based corrosion-resistant 028 alloy is as follows:

[0056] C 0.015%

[0057] Si 0.19%

[0058] Mn 0.72%

[0059] P 0.020%

[0060] S 0.002%

[0061] Cr 26.7%

[0062] Ni 31.5%

[0063] Mo 3.8%

[0064] Cu 1.2%

[0065] The balance is Fe and other unavoidable impurities.

[0066] Using the above alloys, the iron-nickel-based corrosion-resistant 028 alloy Q125 grade oil well pipes were prepared through the following steps and schemes, and made into the first category:

[0067] (1) Prepare a blank tube with an outer diameter of 250mm and a wall thickness of 25mm by hot extrusion;

[0068] (2) A cold-rolled pipe with an outer diameter of 219 mm and a wall thickness of 16 mm was prepared by using a 350-type Pilger cold rolling mill;

[0069] (3) The chamber-type annealing furnace heated by natural gas is annealed at 1200±5°C for 75±5 minutes by heating with the furnace;

[0070] (4) The 350-type Pilger...

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Abstract

A method for increasing the stress corrosion resistance of a Fe-Ni-based anticorrosion alloy oil well pipe comprises the following steps: I, preparing a blank pierced billet for a cold hardening typeFe-Ni-based anti-corrosion alloy oil well pipe through hot working modes such as hot extrusion or hot rolling; II, preparing the cold hardening type Fe-Ni-based anti-corrosion alloy oil well by adopting a two-pass or multi-pass Pilger cold rolling mode; III, carrying out solid-solution annealing among all passes of cold working, and removing a cold hardening effect of a pipe; IV, enabling the deformation rate of final-pass cold rolling to be 56.5 percent or more; V, enabling the feeding amount of the final-pass cold rolling to be 5mm every time or more and the rolling frequency to be 20 per minute or more; VI, slowly cooling an oil well pipe prepared through the final-pass cold rolling to room temperature through an asbestos covering or sand covering mode. According to the method disclosedby the invention, the stress corrosion cracking resistance of the cold hardening type Fe-Ni-based anti-corrosion alloy oil well in H2S medium environment can be remarkably increased.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to the field of corrosion-resistant alloy processing. Background technique [0002] Oil and natural gas are important primary energy sources and play an important role in the national economy. With the continuous reduction of high-quality resources, more and more H-containing 2 S medium sour oil and gas resources need to be exploited. The well depth of these projects can reach more than 6,000 meters, and the downhole temperature is close to 200°C, H 2 S and CO 2 Partial pressure high, H 2 The highest S content is close to 80%, and it may also contain high concentrations of Cl - . As the well depth increases, the pressure increases, the temperature increases, and the CO 2 、H 2 S, Cl - As the content of corrosive media increases, the mining environment is becoming more and more harsh. Ordinary carbon steel or stainless steel oil well pipes will fail due to corrosion in a very s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/84C21D8/10C21D9/08C22C38/02C22C38/04C22C38/42C22C38/44
CPCC21D1/26C21D1/84C21D8/105C21D9/085C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44
Inventor 董盼高建兵范光伟康喜唐赵建伟孙涛张琳韩子健
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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