Corrosion behavior of Cr-bearing steels in CO2-O2-H2O multi-thermal-fluid environment

Juntao Yuan; Kaifeng Zhu; Jingjing Jiang; Huihui Zhang; Anqing Fu; Wensheng Li; Chengxian Yin; Fagen Li

doi:10.1088/2053-1591/abbfbc

Materials Research Express (Jan 2020)

Corrosion behavior of Cr-bearing steels in CO2-O2-H2O multi-thermal-fluid environment

Juntao Yuan,
Kaifeng Zhu,
Jingjing Jiang,
Huihui Zhang,
Anqing Fu,
Wensheng Li,
Chengxian Yin,
Fagen Li

Affiliations

Juntao Yuan: ORCiD; State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, People’s Republic of China
Kaifeng Zhu: Petro China Dagang Oil and Gas Field Company, Tianjin 300280, People’s Republic of China
Jingjing Jiang: Research Institute of Natural Gas Technology, PetroChina Southwest Oil and Gas Field Company, Chengdu 610213, People’s Republic of China
Huihui Zhang: School of Materials Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054, People’s Republic of China
Anqing Fu: State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, People’s Republic of China
Wensheng Li: State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, People’s Republic of China
Chengxian Yin: ORCiD; State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, People’s Republic of China
Fagen Li: State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, People’s Republic of China

DOI: https://doi.org/10.1088/2053-1591/abbfbc
Journal volume & issue: Vol. 7, no. 10
p. 106518

Abstract

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Multi-thermal fluid is used to enhance heavy oil recovery, but it also causes severe corrosion failure of metallic tubing and its mechanism is still open to debate. In the present work, the c orrosion behavior of commercial steels with different Cr content (3 wt%, 9 wt%, and 25 wt%) in simulated CO _2 -O _2 -H _2 O multi-thermal fluid environments were studied by immersion corrosion test and microstructural characterization. The results exhibit that the Cr content of steel determines the type of corrosion products. The less protective corrosion scale is mainly composed of FeCO _3 , (Fe, Cr) _3 O _4 , and Fe _2 O _3 , which is formed on the surface of 3Cr and 9Cr steels. The protective corrosion scale is mainly Cr _2 O _3 , which is formed on the surface of 25Cr steel. Only when the Cr content in steel is sufficient (i.e. 25 wt%) to repair the serious depletion of Cr in the metal near the scale/metal interface in time, can protection of the corrosion scale be sustained, to improve its ability to resist the corrosion of multi-thermal fluids.

Published in Materials Research Express

ISSN: 2053-1591 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials; Technology: Chemical technology
Website: https://iopscience.iop.org/journal/2053-1591

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