首页|天然CO2沿井筒泄漏两相反应流动特征模拟

天然CO2沿井筒泄漏两相反应流动特征模拟

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碳捕集利用与封存(CCUS)技术是实现大规模碳减排的重要途径,而CO2注入储层后的泄漏风险是CCUS技术关注的重点之一.由于目前CCUS工程中还未有深部封存的CO2泄漏事故发生,但天然CO2泄漏事件并不少见,因此以天然CO2井筒泄漏点为研究对象进行类比研究可为CCUS工程泄漏风险评估提供有价值的参考依据.以西宁盆地南部天然CO2泄漏场地中的典型CO2井筒泄漏点—ZK10井为研究对象,结合实测数据,采用数值模拟方法分析了该井间歇喷发过程的动力学机制及伴随的化学变化特征.结果表明:①ZK10井的水气间歇喷发过程受CO2过饱和析出、气举效应及储层动态补给的协同控制;②受控于CO2的过饱和析出及流体混合作用,井筒内CO2闪蒸点以上位置地下水的pH值随深度减小而增大,并随喷发过程发生周期性的变化;③ZK10井间歇喷发过程中,井筒内形成方解石和石英矿物沉淀,受控于矿物的溶解特性,其沉淀特征各异.该研究结果可为类似的天然或CCUS工程中CO2井筒泄漏点的泄漏机制及化学特征研究提供参考,进而为相关部门制定监测及预防措施提供依据.
Simulation on two-phase reactive flow characteristics of natural CO2 leakage along wellbore
Carbon capture,utilization and storage(CCUS)is a critical technology to achieve large-scale car-bon emission reduction,and the leakage risk after CO2 injection is one of its concerns.Although no deep-stored CO2 leakage accident has occurred in the CCUS project,there are many natural CO2 leakage events worldwide,and the study of the analogous natural CO2 leakage process will provide a valuable reference for the leakage risk assessment of the CCUS project.In this study,taking a typical CO2 wellbore leakage site in the southern Xining Basin,Well ZK10,as the study object,we established a numerical model on the basis of the measured data to investigate the kinetic mechanism and the accompanying chemical characteristics dur-ing the periodic eruption.The study results show that many factors,including CO2 exsolution,gas-lift effect,and the dynamic recharge of groundwater from the reservoir,control the periodic eruption of Well ZK10.Synchronously,under the control of CO2 exsolution and fluid mixing,the pH value of groundwater within the wellbore above the flash point increases with the decrease of depth,and changes periodically with the eruption.During the periodic eruption of ZK10,calcite and quartz are precipitated within the well-bore,and their precipitation characteristics are different due to their disparate solubilities in the groundwa-ter.These results can provide a reference for the investigation of leakage mechanism and chemical charac-teristics of CO2 leakage along wellbores in similar natural scenes or CCUS projects,and then provide a basis for relevant departments to develop monitoring and prevention measures.

natural CO2wellbore leakageperiodic eruptionchemical reactioncarbon capture,utilization and storage(CCUS)technologynumerical simulation

郑长远、蔡雨娜、雷宏武、封官宏

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青海省水文地质工程地质环境地质调查院青海省水文地质及地热地质重点实验室,青海 西宁 810008

武汉大学土木建筑工程学院,湖北 武汉 430072

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北 武汉 430071

吉林大学地下水资源与环境教育部重点实验室,吉林 长春 130021

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天然二氧化碳 井筒泄漏 间歇喷发 化学反应 CCUS技术 数值模拟

2020年度青海省"昆仑英才"行动计划项目2021年度青海省地质矿产勘查开发局高层次人才项目(人才+项目)国家自然科学基金项目中国石油科技创新基金项目

青人才字[2020]18号青地矿科[2021]16号423072252021D002-1102

2024

10.13578/j.cnki.issn.1671-1556.20221396

安全与环境工程
中国地质大学

安全与环境工程

CSTPCD北大核心
影响因子：1.03
ISSN：1671-1556
年,卷(期)：2024.31(1)
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