Effect of O2 on down-hole corrosion during air-assisted steam injection for heavy oil recovery |
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| Authors: | Yani Zhang Guoxian Zhao Y Frank Cheng |
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| Affiliation: | 1. School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an, People’s Republic of Chinazhangyn@xsyu.edu.cn;3. School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an, People’s Republic of China;4. Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Canada |
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| Abstract: | ABSTRACTAir-assisted steam injection is used to enhance hydrocarbon recovery from heavy oil reservoirs. During this process, downhole tubular goods are subject to corrosion in a mixed oxygen-carbon dioxide-steam environment at temperature up to around 200°C causing a low-temperature oxidation phenomenon. Here we investigate the influence of the O2/CO2 ratio on the corrosion of P110 steel, a grade that is commonly used for oil well casings. Our findings show that corrosion is greatly influenced by the O2 pressure but hardly at all by the CO2 pressure. The maximum corrosion rate was in excess of 65?mm per year. However, alkalisation of the injected fluid, which promoted the formation of a protective magnetite scale, was found to greatly reduce corrosion. |
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| Keywords: | Oil tube corrosion behaviour O2/CO2 conversion high temperature and pressure environment |
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