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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
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cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Research on C02 Corrosion and Corrosion Control Method in Oil and Gas Field Development

Author of the article:Yuan Qing, Liu Yin, Bi Yanxia, Niu Zengqian, Wang Yunyun, He Zhiyong, Jia Hongzhan

Author's Workplace：Engineering Technology Research Institute, BHDC

Key Words：C02; Corrosion; Corrosion mechanism; Corrosion control method

Abstract：In order to reduce C0₂ corrosion in oil and gas field development, it is necessary to study C0₂ corrosion mechanism, corrosion form, inducement mechanism, influence factor and corrosion control method. Results obtained from corrosion mechanism study show that C0₂ generates carbonic acid firstly and then produces electrochemical reaction, which results in corrosion of steel. C0₂ corrosion includes uniform corrosion, pitting corrosion and erosion corrosion, and pitting corrosion occurs frequently and has the most severe hazard. Factors affecting C0₂ corrosion rate includes pH, C0₂ partial pressure, temperature, flow velocity and water content, etc. At present, there are many measures for C0₂ corrosion control in oil and gas field development and selection of corrosion resistant metal tubes is the basic approach for corrosion control. However, corrosion inhibitor injection is the optimum method for corrosion control due to its good protecting effect, easy operation, inexpensive cost and very high applicability. Through studies on current corrosion control methods in oil and gas field development, selection criteria of corrosion control methods is proposed and it is suggested that corrosion inhibitor is studied and applied.