To cope with the increasingly severe energy crisis and greenhouse effect,CO2-enhanced oil recovery(CO2-EOR)technology stands out,and the safety of the geological storage and corresponding storage capacity evaluation after enhanced oil recovery with CO2 have attracted widespread attention.Herein,nine models with the injection of CO2 content ranging from 10％ to 90％ were constructed based on the reservoir conditions in Jilin oilfield through numerical simulation.The distribution rules of various phase components in the reservoir were investigated under conditions of water saturation of 30％,50％,and 90％ and reservoir pressures of 10 MPa,20 MPa,and 30 MPa.The safe storage capacity of CO2 was finally clarified based on the previous work on the division of the safe storage state of buried CO2.The results showed that:1)When water saturation(30％)and pressure(10 MPa)are constant,the increase of CO2 content(10％～90％)can significantly improve the effective storage volume fraction of CO2(26％～93％);2)The rise of pressure(10～30 MPa)promotes the dissolution of CO2 in the oil phase,which slightly reduces the storage capacity of the reservoir(18％～7％);3)The impact of water saturation on the storage capacity of CO2 in the reservoir is negligible.This study aims to clarify the CO2 geological storage capacity under different conditions,which can provide a reference for related research.
关键词
CO2封存/封存能力评估/含水饱和度/储层压力/CO2含量/数值模拟
Key words
CO2 storage/storage capacity assessment/water content saturation/reservoir pressure/CO2 content/numerical simulation
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