(v13preprint53)Influence of Temperature on Anti-sulfur Steels in simulated Oilfield Solution with High CO2/H2S Corrosion

摘要

The present work investigated the influence of temperature on the characterization of corrosion product films and corrosion rates of anti-sulfur steels in the H2S/CO2 containing oilfield environment at various temperatures. The resistance of anti-sulfur steels to CO2/H2S corrosion was highlighted to provide information for material selection in sour corrosion oilfield. The corrosion rates were calculated by weight loss method carried out in the high-temperature and high-pressure autoclave. Meanwhile, surface morphologies of corrosion product films were studied by means of scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS). The results indicated that the corrosion product films became more protective and the corrosion rates of anti-sulfur steels substantially decreased with increasing temperature. H2S corrosion dominated the corrosion process under the test conditions. In addition, the anti-sulfur materials of both P110S and N80SS were superior to the common steel P110 in the CO2/H2S corrosion environment especially at temperature below 120 oC.