| Effect of HCO3^- concentration on CO2 corrosion in oil and gas fields |
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| 作者姓名： | Guoan Zhang Minxu Lu Chengwen Chai Yinshun Wu |
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| 作者单位： | Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | 国家高技术研究发展计划(863计划)，the National Key Basic Research and Development Plan Program |
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| 摘 要： | The effect of HCO3^- concentration on CO2 corrosion was investigated by polarization measurement of potentiodynamic scans and weight-loss method, Under the conditions of high pressure and high temperature, the corrosion rate of steel X65 decreased with the increase of HCO3^- concentration, while pH of solution increased. SEM, EDS, and XRD results of the corrosion scales indir cated that the typical FeCO3 crystallite was found at low HCO3^- concentration but Ca（Fe,Mg）（CO3）2 was found at high HCO3^- con- centration. Ca^2＋ and Mg^2＋ are precipitated preferential to Fe^2＋ at high pH value. Potentiodynamic polarization curves showed that the cathodic current density decreases with the increase of HCO3^- concentration at low HCO3^- concentration. When the HCO3^- concentration reaches 0.126 mol/L, increasing HCO3^- concentration promotes cathodic reactions. Anodic behavior is an active process at low HCO3^- concentration and the anodic current density decreases with the increase of HCO3^- concentration. An evident active-passive behavior is exhibited in anodic process at 0.126 mol/L HCO3^-.
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| 关 键 词： | 油气田 二氧化碳腐蚀 碳酸氢盐 极化曲线 |
| 收稿时间： | 2004-09-15 |
Effect of HCO3 concentration on CO2 corrosion in oil and gas fields |
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| Guoan Zhang Minxu Lu Chengwen Chai Yinshun Wu.Effect of HCO3^- concentration on CO2 corrosion in oil and gas fields[J].Journal of University of Science and Technology Beijing,2006,13(1):44-49. |
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| Authors: | Guoan Zhang Minxu Lu Chengwen Chai Yinshun Wu |
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| Affiliation: | Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The effect of HCO3- concentration on CO2 corrosion was investigated by polarization measurement of potentiodynamic scans and weight-loss method. Under the conditions of high pressure and high temperature, the corrosion rate of steel X65 decreased with the increase of HCO3- concentration, while pH of solution increased. SEM, EDS, and XRD results of the corrosion scales indicated that the typical FeCO3 crystallite was found at low HCO3- concentration but Ca(Fe,Mg)(CO3)2 was found at high HCO3 concentration. Ca2 and Mg2 are precipitated preferential to Fe2 at high pH value. Potentiodynamic polarization curves showed that the cathodic current density decreases with the increase of HCO3- concentration at low HCO3- concentration. When the HCO3- concentration reaches 0.126 mol/L, increasing HCO3 concentration promotes cathodic reactions. Anodic behavior is an active process at low HCO3- concentration and the anodic current density decreases with the increase of HCO3- concentration. An evident active-passive behavior is exhibited in anodic process at 0.126 mol/L HCO3-. |
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| Keywords: | oil and gas fields carbon dioxide corrosion bicarbonate concentration polarization curves |
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