天然气工业2024，Vol.44Issue(4)：104-114,11.DOI:10.3787/j.issn.1000-0976.2024.04.011
CO2增强页岩气开采及地质埋存的三维数值模拟
Three-dimensional numerical simulation of CO2 injection to enhance shale gas recovery and geological storage
摘要
Abstract
Injecting CO2 into shale reservoirs is an effective way to reduce carbon emissions,which can not only enhance the natural gas recovery of gas reservoirs,but also achieve the goal of CO2 geological storage.Shale reservoirs have strong heterogeneity,However,few researches have been carried out on the influential mechanisms of vertical reservoir heterogeneity on CO2 enhanced CH4 recovery effect after the injection of CO2 into shale reservoirs.Taking the Wufeng-Longmaxi Formation shale reservoir in the Sichuan Basin as the research object,this paper establishes a 3D numerical model of integrated CO2 enhanced CH4 recovery and geological storage in heterogeneous shale reservoir on the basis of the thermal-hydraulic-mechanical coupling numerical simulation method which takes into account the competitive adsorption of CO2 and CH4.In addition,the reliability of the numerical simulation method is verified through the laboratory experiment results of CO2 displacing CH4.And the following research results are obtained.First,if the injection well is kept in the same horizon,the remaining CH4 in each sublayer presents an increasing trend,and the CO2 storage presents the trend of decreasing gradually with the depth increase of the production well.Second,if the production well is kept in the same horizon,the remaining CH4 in each sublayer decreases with the depth increase of the injection well,and the CO2 storage in each sublayer increases with the increase of vertical spacing between the injection well and the production well.Third,increasing vertical spacing between the injection well and the production well can result in an increase in CH4 production increment and CO2 storage.In conclusion,shale has stronger competitive adsorption to CO2 and CH4,and the related process is a complex thermal-hydraulic-mechanical coupling process.The simulation study of this basic theory is of practical significance to CO2 injection to replace CH4 for enhancing shale gas recovery and CO2 storage.What's more,the research results provide a theoretical support for the field application of the related technologies in the future.关键词
CO2 增强页岩气开采/CO2 地质埋存/储层非均质性/热—流—固多场耦合三维模型Key words
CO2 enhanced shale gas recovery/CO2 geological storage/Reservoir heterogeneity/Thermal-hydraulic-mechanical coupling 3D model分类
能源科技引用本文复制引用
赵鹏,朱海燕,张丰收..CO2增强页岩气开采及地质埋存的三维数值模拟[J].天然气工业,2024,44(4):104-114,11.基金项目
国家重点研发计划项目"CO2地质封存协同枯竭页岩储层增渗开采技术"(编号:2023YFE0110900)、"大型油气藏CO2压裂埋存全流程关键技术指标体系及标准化"(编号:2023YFF0614102) （编号:2023YFE0110900）
地质灾害防治与地质环境保护国家重点实验室自主研究课题"页岩基质损伤渗透-裂缝内多相流耦合裂缝扩展研究"(编号:SKLGP2022Z018). （编号:SKLGP2022Z018）
