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《Oil & Gas Geology》 2007-05
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A study on the miscible conditions of CO_2 injection in low-permeability sandstone reservoirs

Guo Ping,Li Miao(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)  
This article illustrates the impacts of slim-tube experimental conditions on test results of minimum miscibility pressure(MMP).The numerical simulation results show that the MMP is smaller when the slim-tube's length is longer,diameter is smaller,displacement speed is greater,and the porosity is smaller.In addition,it discusses the influences of reservoir temperature,injected gas compositions and crude oil compositions and properties on the miscible pressure.Through comparing the condition of CO2 miscible flooding reservoirs and fluid flow in foreign and domestic fields,it explains the reasons behind the difficult application of CO2 miscible flooding in China's fields are high formation temperature and high oil viscosity.It is suggested that a research on technologies of reducing minimum miscibility pressure and preventing gas breakthrough be carried out to address the issue of low sweep efficiency of injected gas and to enhance oil recovery.
【Fund】: 国家重点基础研究发展规划(973)项目(2006CB705804)
【CateGory Index】: TE357
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