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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Application of Duplex Stainless Steel in Oil and Gas Industry

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Key Words： Duplex stainless steel； Test； Intermetallic phase

Abstract： KL2 Gas Field is a large CO2 condensate gas field with high output and its gas gathering and transportation pipelines suffer severe CO2 corrosion. Duplex stainless steel is used in the gas field development， since this kind of material is used largely for the first time in China’s condensate gas field development， its technical requirements are very important for safe application. Based on relative requirements in codes， standards and specifications followed in the gas field surface engineering design and combined with technical features of this project， additional technical requirements are put forward for steel pipes， fittings and clad steel plates made of duplex stainless steel. Special examination requirement in these additional technical requirements includes stress corrosion test being able to bear or endure environment conditions at site and detrimental intermetallic phase test being able to control fabrication quality， in which method B and C in ASTM A 923 is adopted respectively for impact toughness test and ferric chloride solution pitting corrosion test. The gas field has been developed for 6 years successfully， which has proved that these special technical requirements for duplex stainless steel have good effects for the project and are suitable to similar projects.