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Effect of Fluid Scouring on Sulfate Reducting Bacteria Induced Corrosion of Pipeline Steel |
GAO Qiuying1,2, ZENG Wenguang1,2, WANG Heng1, LIU Yuancong3, HU Junying3( ) |
1.Petroleum Engineering Technology Research Institute of Sinopec Northwest Oilfield Company, Urumqi 830011, China 2.Key Labortory for EOR of Fracture Vuggy Reservoir of Sinopec, Urumqi 830011, China 3.School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China |
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Abstract Erosion corrosion and sulfate reducing bacteria (SRB) induced corrosion bring harm to the safe operation of pipeline. In this article, the SRB induced corrosion of pipeline steel L360 in fluid scouring environment was studied comparatively by means of numerical simulation and simulation experiments. The predicted cloud map and particle motion trajectory map of the distribution for corrosion areas of pipeline steel were obtained by using computational fluid dynamics (CFD) simulation. Results showed that the most serious corrosion located at the bottom of the pipeline, the corrosion degree at the outlet of the pipeline was higher than that at the entrance of the pipeline. Electrochemical methods and surface analysis methods were used to characterize the SRB induced corrosion in solid-liquid two-phase flowing environment. Results show that when the biofilm of SRB did not exist on the metal surface (i.e., no biofilm of SRB has been formed on the steel through a pre-treatment), the scouring corrosion is dominant, the metal surface shows obvious scouring corrosion characteristics, and the corrosion products are mainly iron oxides. When SRB has formed a dense biofilm on the metal surface (after a proper pre-treatment), SRB corrosion dominates, and the biofilm will inhibit the scouring corrosion, but the life activity of SRB under the film will induce the electron exchange with the metal matrix, so that SRB induced corrosion occurs, and the corrosion products consist mainly of sulfur and iron compounds.
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Received: 19 October 2022
32134.14.1005.4537.2022.321
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Fund: Key Project Topics of Sinopec(319016-5) |
Corresponding Authors:
HU Junying, E-mail: hujunying01@yeah.net
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