1. Under-deposit corrosion of tubing served for injection and production wells of CO2 flooding.
- Author
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Wang, Qiuyu, Wu, Wei, Li, Qing, Zhang, Deping, Yu, Yifan, Cao, Bei, and Liu, Zhiyong
- Subjects
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INJECTION wells , *TUBES , *CARBON dioxide , *STEEL tubes , *FERRIC oxide - Abstract
• The under-deposit corrosion mechanism of tubing steel is clarified in detail. • The synergistic effect of CO 2 and SRB causes under-deposit corrosion. • The enrichment of Cl - accelerates the localized corrosion process beneath the corrosion products. The tubing steel served for the injection and production wells of CO 2 flooding was investigated using various characterization methods. The results showed the corrosion failure of the tube was caused by the jointed action of sulfate-reducing bacteria (SRB), CO 2 and chloride ions ( Cl -) during service. The corrosion product film formed on the tubing steel exhibited a bilayer structure. The outer layer was mainly composed of FeS and FeCO 3 , which was caused by SRB corrosion and CO 2 corrosion respectively, and the inner layer was primarily iron oxide and oxyhydroxide caused by Cl - enrichment and CO 2 corrosion. FeCO 3 was found in both layers. Accordingly, the synergistic effect of SRB and CO 2 resulted in the under-deposit corrosion, and the enrichment of Cl - accelerated the localized corrosion. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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