Influence of H2S Content on CO2 Corrosion Behaviors of N80 Tubing Steel |
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| Authors: | D. Jingen Y. Wei L. Xiaorong D. Xiaoqin |
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| Affiliation: | 1. Faculty of Petroleum Engineering , China University of Petroleum , Beijing, China;2. Department of Foreign Languages , China University of Petroleum , Beijing, China |
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| Abstract: | Abstract The corrosion behaviors of N80 steel in pure CO2 and at different partial pressure ratios of CO2/H2S were tested by high-temperature and high-pressure autoclave. At 90°C, with the additional H2S to pure CO2, the surface corrosion condition improved greatly and the corrosion rates were lower than in pure CO2 condition. With the increase of partial pressure ratio, the corrosion rate reached a peak value at pCO2/pH2S = 100 and then declined. The corrosion products of the samples in different conditions were analyzed by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD) methods. The inner film is finer and denser than the outer scale. |
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| Keywords: | CO2 corrosion CO2/H2S corrosion corrosion product film corrosion rate peak N80 Tubing steel |
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