Abstract
Multi-component thermal fluid flooding is an efficient thermal technology for heavy oil recovery. However, the oil and gas transported by the gathering pipeline exhibit the large temperature difference along with high O2, H2S and CO2 contents, which may easily bring serious corrosion problems to the pipeline. In this article, the present work aims to study corrosion behavior and corrosion mechanisms in a CO2/H2S/O2 coexistence system using a Huning 4 block gathering pipeline material, particularly clarifying the influence of temperature on the corrosion behavior and localized corrosion mechanism. The high-temperature autoclave was used to simulate the corrosion environments. The corrosion products at various temperatures were examined via three-dimensional optical microscopy, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The maximum uniform corrosion rate of L245NS is 0.5149 mm/a (at 333 K), and the maximum local corrosion rate is 4.6258 mm/a (at 363 K). At lower temperatures (303–333 K), the corrosion product film possessed a double-layered membrane, where the bottom layer was enriched with S-based elements, mainly FeS or FeS2 and the upper layer was mainly covered by FeCO3 with the uniform corrosion state. Applying the higher temperatures (363–393 K) made the FeCO3 grain coverage more continuous and dense, leading to the formation of a dense double-layered film, where the uniform corrosion was suppressed, while localized corrosion emerged. The thermodynamics shows that an increase in the temperature was found to decrease the solubility product coefficient of FeS and FeCO3, inducing the appearance of a protective layer and inhibiting the corrosion process.
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All datasets underlying the conclusions of the paper should be available to readers. We deposit their datasets in publicly available repositories in the manuscript.
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This work was supported by the National Natural Science Foundation of China (Grant No. 51674212).
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The thesis was written by Shuai Zhao. The experiments and analytical method were designed by Kexi Liao. The experimental part was implemented by Feilong Zhou, The data processing was performed by Jihui Leng. The manuscript was revised by Qiang Huang and Guoxi He.
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Zhao, S., Liao, K., Zhou, F. et al. Effect of Temperature on the Corrosion Behavior of L245NS Steel in a CO2/H2S/O2 Multi-component Thermal Fluid Collection and Transportation System. Arab J Sci Eng 47, 11223–11237 (2022). https://doi.org/10.1007/s13369-021-05906-y
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DOI: https://doi.org/10.1007/s13369-021-05906-y