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工程科学与技术:2024,56(1):195-205
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基于数值模拟的CO2地质封存项目井筒泄漏风险定量化评价方法
(1.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;2.中国科学院大学,北京 100049)
Quantitative Evaluation Method of Wellbore Leakage Risk of CO2 Geological Storage Project Based on Numerical Simulation
(1.State Key Lab. of Geo-mechanics and Geo-technical Eng., Inst. of Rock and Soil Mechanics, Chinese Academy of Sci., Wuhan 430071, China;2.Univ. of Chinese Academy of Sci., Beijing 100049, China)
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投稿时间:2022-11-09    
中文摘要: 为评估CO2地质封存场地的CO2沿井筒泄漏风险,介绍了自主研发的可对CO2井筒泄漏风险进行定量化评价的数值模拟WellRisk软件,将软件应用于实际CO2地质封存场地--神华鄂尔多斯CO2咸水层封存示范工程,定量评估该场地CO2沿注入井和监测井的泄漏量,并将软件模拟结果与美国能源部开发的NRAP–IAM–CS(The national risk assessment partnership–integrated assessment model–carbon storage)软件模拟结果进行对比,实现了CO2沿井筒泄漏风险的定量化评价。定义了井筒泄漏系数,即井筒发生泄漏的有效截面积和井筒总截面积的比值,并将井筒泄漏系数作为量化表征井筒固井质量的重要参数。当泄漏系数取值为10–6时,神华CO2地质封存场地在1 000 a内的总泄漏量为720 tCO2,占总注入量的0.24%,小于IPCC的风险阈值1%。因此,泄漏系数为10–6或更低的井筒是低风险泄漏井,具有良好的固井质量,对应于NRAP–IAM–CS软件中井筒渗透率低于10–12 m2的情况。泄漏系数为10–5或更高的井筒是高风险泄漏井,具有较差的固井质量。WellRisk和NRAP–IAM–CS的计算结果均表明,当注入井和监测井的固井质量良好时,神华CO2地质封存场地基本不存在CO2泄漏风险。
中文关键词: CO2地质封存  CO2泄漏  井筒  风险评估  固井
Abstract:To evaluate the CO2 leakage risk through wellbores in CO2 geological storage sites, a self-developed numerical simulation code-WellRisk is introduced. The WellRisk could quantitatively evaluate the CO2 wellbore leakage risk, and it was applied to an actual CO2 geological storage site-Shenhua Ordos saline aquifer CO2 storage demonstration project. The leakage of CO2 along the injection wells and monitoring wells at the site was quantitatively evaluated by WellRisk, and the results were compared against the simulation results of NRAP–IAM–CS (The National Risk Assessment Partnership–Integrated Assessment Model–Carbon Storage) developed by the US Department of Energy, demonstrating a reliable quantitative assessment of CO2 leakage risk by WellRisk. This paper defines the wellbore leakage coefficient (the ratio of the effective sectional area of the wellbore where leakage occurs to the total sectional area of the wellbore) and takes the wellbore leakage coefficient as an important parameter to quantitatively characterize the quality of wellbore cementing. When the leakage coefficient is 10–6, the total CO2 leakage of the Shenhua storage site in 1 000 years is 720 tons, accounting for 0.24% of the total injection, which is less than the IPCC CO2 leakage risk threshold of 1%. Therefore, wellbores with leakage coefficients of 10–6 or lower are low-risk leakage wells with good cementing, corresponding to wellbore permeability below 10–12 m2 in the NRAP–IAM–CS software. Wellbores with leakage coefficients of 10–5 or higher are high-risk leakage wells with poor cementing. The results of WellRisk and NRAP–IAM–CS both show that when the quality of wellbore cementing in injection wells and monitoring wells is good, there is almost no risk of CO2 leakage at the Shenhua CO2 storage site.
文章编号:202201228     中图分类号:X8    文献标志码:
基金项目:内蒙古自治区科技重大专项(2021ZD0034);国家自然科学基金项目(42172315;U1967208);中国石油科技创新基金项目(2021 D002–1102)
作者简介:第一作者:甘满光(1992-),男,助理研究员,博士.研究方向:二氧化碳地质封存.E-mail:cumtgmg@163.com;通信作者:张力为,E-mail:lwzhang@whrsm.ac.cn
引用文本:
甘满光,雷宏武,张力为,李小春,李琦.基于数值模拟的CO2地质封存项目井筒泄漏风险定量化评价方法[J].工程科学与技术,2024,56(1):195-205.
GAN Manguang,LEI Hongwu,ZHANG Liwei,LI Xiaochun,LI Qi.Quantitative Evaluation Method of Wellbore Leakage Risk of CO2 Geological Storage Project Based on Numerical Simulation[J].Advanced Engineering Sciences,2024,56(1):195-205.