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| Mechanisms and fault tree analysis of CO2 leakage during geological storage in oil reservoirs |
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REN Shaoran1, HAN Bo1, REN Jianfeng1, ZHANG Liang1, LI Dexiang1, GONG Zhiwu1, WANG Xiaohui2, CHEN Guoli3, XIONG Xiaoqin4
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(1.School of Petroleum Engineering in China University of Petroleum,Qingdao 266580,China;2.Technology Inspection Center of Shengli Oilfield, Dongying 257000,China;3.Research Institute of Petroleum Exploration ＆ Development,Jilin Oilfield Company,Songyuan 138000,China;4.Institute of Engineering and Technology,Xinjiang Oilfield Company,Karamay 834000,China)
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| Abstract: |
| In this study, the leaking mechanisms and potential pathways of CO2 during geological storage in oil reservoirs were analyzed based on a fault tree analysis method, in combination with the field monitoring results of a CO2 enhanced oil recovery (EOR) and storage demonstration project. The analysis results show that the sealing failures of injector and oil production wells, including casing and wellhead facilities damage, and well cementing failure, are the main reasons for the leakage of CO2, which have been observed in the field monitoring. There has been no reported large-scale leakage of CO2 occurring, but relatively high and abnormal CO2 concentration in soil near some wellbores were measured, indicating that there was some leakage of CO2 through well casing string or incomplete cement ring occurring. The fault tree analysis results can provide guidelines for monitoring and preventing leakage of CO2 during geological storage. |
| Key words: CO2 geological storage fault tree analysis CO2 leakage well leakage environmental monitoring |
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