The integrating technology of EOR and CO2 sequestration would bring large quantities of CO2 storage capacity and increase recoverable oil, calling “Green Oil.” In CO2 injection process, the gravity segregation and miscibility condition are key factors to be successful for effective application of CO2 flooding. In this aspect, this study presents the results how can miscibility condition affect oil recovery and CO2 sequestration under the environment of gravity segregation. Most previous researches to improve CO2 EOR and CO2 sequestration have been conducted on one dimensional core flooding experiments which cannot reflect gravitational effect. This study performed the experiments on two dimensional sandstone plate being capable of gravity segregation phenomena. Our new experimental approach would be useful for designing the successful CO2 sequestration, particularly in thick reservoir dominating gravity segregation.


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