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| 油藏埋存CO2泄漏机制及故障树分析 |
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任韶然1,韩波1,任建峰1,张亮1,李德祥1,宫智武1,王晓慧2,陈国利3,熊小琴4
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(1.中国石油大学石油工程学院,山东青岛 266580;2.胜利油田技术检测中心,山东东营 257000;3.吉林油田勘探开发研究院,吉林松源 138000;4.新疆油田工程技术研究院,新疆克拉玛依 834000)
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| 摘要: |
| 利用故障树分析法,结合油田CO2驱和埋存示范区泄漏及环境监测结果,对油藏埋存CO2发生泄漏的途径和泄漏机制进行分析,并对CO2驱和埋存示范区进行环境监测。结果表明:对圈闭性很好的油藏,井的密封性失效(包括套管和井口设施损坏)、固井不完善及水泥环腐蚀是造成CO2泄漏的主要原因;整体上,埋存于地下的CO2没有发生大规模的泄漏,但在近井土壤中CO2含量有增加的趋势,越靠近井口土壤中CO2含量越大,表明CO2通过井内套管柱或不完整水泥环发生了微量泄漏。故障树分析结果对CO2埋存区的泄漏监测和预防具有指导意义。 |
| 关键词: CO2地质埋存 故障树分析 CO2泄露 井泄漏 环境监测 |
| DOI：10.3969/j.issn.1673-5005.2017.01.012 |
| 分类号::TE 992.1 |
| 文献标识码:A |
| 基金项目:“十二五”国家油气重大专项(2011ZX05016-005)；“十三五”国家油气重大专项(2016ZX05056004-003) |
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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 |
