天然气工业2017，Vol.37Issue(3)：62-69,8.DOI:10.3787/j.issn.1000-0976.2017.03.008
致密低渗透气藏注CO2提高采收率潜力评价
Potential evaluation on CO2-EGR in tight and low-permeability reservoirs
摘要
Abstract
CO2-EGR,i.e.enhanced gas recovery by injecting CO2,is to displace natural gas by injecting CO2 in the supercritical phase.It can both enhance the recovery of gas reservoirs and realize CO2 storage.Currently,this technique is still at its exploring stage.The effect of CO2-EGR is not clarified,the geologic conditions for CO2-EGR are not definite,and the rational working system for CO2-EGR is not available.In this paper,the long-core experiment was conducted to determine whether and how much the recovery of low-permeability reservoirs can be enhanced by injecting CO2.According to the experimental results,the recovery can be enhanced by 12％ when CO2 content in produced gas is more than 10％.Moreover,the multi-component seepage mathematical model was built for displacing natural gas by injecting supercritical CO2,and the model accuracy was verified using laboratory data.With this mathematical model,the influence factors for displacing natural gas by injecting supercritical CO2 were analyzed in order to define the conditions for selecting favorable zones.The Well DK13 area in the Daniudi gas field,Ordos Basin,was selected for potential evaluation of CO2-EGR.As indicated by the numerical simulation results,when CO2 content of producing wells in the Well DK13 area is 10％ (with a lower cost for corrosion prevention),the ratio of CO2-EGR is 8.0-9.5％,and 31.1％ HCPV CO2 storage can be realized.It is thus concluded that the CO2-EGR technique can enhance the recovery of gas reservoirs and also store CO2 underground,contributing to the increase of both social and economic benefits.关键词
注CO2/低渗透致密气藏/提高采收率/数值模拟/CO2埋存/长岩心实验/主控因素/潜力评价Key words
CO2 injection/Tight and low-permeability gas reservoir/Enhanced gas recovery (EGR)/Numerical simulation/CO2 storage/Long-core experiment/Major controlling factor/Potential evaluation引用本文复制引用
史云清,贾英,潘伟义,黄磊,严谨,郑荣臣..致密低渗透气藏注CO2提高采收率潜力评价[J].天然气工业,2017,37(3):62-69,8.基金项目
国家科技重大专项“鄂北致密气藏注气开发优化设计技术研究”(编号:2016ZX05048003-004)、中国石油化工股份有限公司科技部项目“注CO2提高凝析气藏采收率机理研究”(编号:P15031)、中国石油化工股份有限公司科技部基础前瞻项目“大牛地气田CO2驱提高采收率可行性评价”(编号:G5800-14-ZS-KJB033-5). （编号:2016ZX05048003-004）
