Abstract
Abstract Miscible and near-miscible gasflooding has proven to be one of the few cost effective enhanced oil recovery techniques. The sweep efficiency of such processes is often not high due to adverse mobility ratio, gravity override and reservoir heterogeneity. Several sweep improvement techniques have been developed, but there is no laboratory technique to estimate sweep efficiency at reservoir conditions. A high-pressure quarter 5-spot cell has been constructed in this work to conduct multicontact miscible water-alternating-gas (WAG) displacements at reservoir conditions. Multicontact miscible solvents are identified by conducting slimtube experiments for a medium viscosity oil (78 cp). Coreflood experiments are conducted to determine microscopic displacement efficiency as a function of WAG ratio. Quarter 5-spot experiments are conducted to infer sweep efficiency in a 3D geometry at the laboratory scale. WAG improves the microscopic displacement efficiency over continuous gas injection followed by waterflood in corefloods. WAG injection improves the oil recovery and thus sweep efficiency in the quarter 5-spot model over the continuous gas injection followed by waterflood. WAG injection slows down gas breakthrough. A decrease in the slug size improves the sweep in WAG floods. Use of a horizontal production well lowers the sweep over a vertical production well during continuous gas injection.
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