Confined Core Flooding Test for Tight Rock with Hydrocarbon Gas as an eor Agent

Summary Filtration of a hydrocarbon gas through an oil-saturated tight core sample is investigated under reservoir conditions. Core sample permeability to the oil phase is 0.004 mD. In situ X-ray scanning is applied as the main method for the oil recovery coefficient determination. The distribution of hydrocarbon gas within the core sample is observed during the entire experiment. The displacement coefficient of reservoir oil by the hydrocarbon gas is found to be 70–75%. The obtained value allows proposing that the chosen hydrocarbon gas is an optimal agent for oil recovery for similar tight oil reservoirs.