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The effects of reservoir temperature and percent levels of methane and ethane in CO2 on the minimum miscibility pressures (MMPs) of crude oils were measured using a vanishing interfacial tension (VIT) method. MMPs increased linearly with methane concentrations but decreased when ethane was added to CO2. Higher reservoir temperatures yielded much higher MMPs for the same oil, apparently because of...
Enhanced oil recovery (EOR) processes using CO2 in tight unconventional plays like the Bakken formation are expected to be very different from the processes which control EOR in conventional permeable reservoirs. During CO2 EOR in conventional reservoirs, CO2 flows through the permeable rock, while in the Bakken, CO2 flow will be dominated by fracture flow, and not significantly through the rock matrix...
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