Abstract
Corrosion tests were conducted in a high-temperature high-pressure (HTHP) autoclave to simulate the conditions of CO2 auxiliary steam drive in gas injection wells. Weight loss tests were performed with the sheets of N80 and 9Cr steels under the testing conditions. The morphology and composition of corrosion products were explored by SEM, EDS, XRD and XPS. The corrosion resistance of 9Cr steel was better than that of N80 steel under the testing conditions. The corrosion rates of N80 and 9Cr met the application requirements in CO2 auxiliary steam drive. The results broke the constraint in ISO-15156 standards. The corrosion process of N80 steel was mainly affected by the flow velocity. However, the corrosion process of 9Cr steel was mainly affected by temperature. The corrosion resistance of 9Cr steel depended on the FeCO3 content of Cr-rich layer, which was closely related to temperature. The low flow velocity influenced the diffusion process of N80 steel corrosive ions, whereas the high flow velocity influenced the integrity of corrosion scales. Considering the influence of flow velocity on the corrosion of tubing and casing, in the gas injection well, 9Cr steel and N80 steel were, respectively, selected as the materials of tubing and casing.
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The authors acknowledge the support from National Science and Technology Major Project of China (No. 2016ZX05012-001) and the National Natural Science Foundation of China (No. 51374177).
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Dong, B., Zeng, D., Yu, Z. et al. Corrosion Mechanism and Applicability Assessment of N80 and 9Cr Steels in CO2 Auxiliary Steam Drive. J. of Materi Eng and Perform 28, 1030–1039 (2019). https://doi.org/10.1007/s11665-018-3847-z
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DOI: https://doi.org/10.1007/s11665-018-3847-z