Use of CO2 as Solvent during Steam-Over-Solvent Injection in Fractured Reservoirs (SOS-FR) Method for Heavy Oil Recovery

Due to low efficiencies and the high cost of individual injection of steam and solvent for heavy-oil recovery, their hybrid<br>applications have gained significant attention recently. Although numerous laboratory studies exist and there are a<br>considerable number of field projects for sandstone environments, fractured carbonates lack technologies to drain matrix oil<br>efficiently. An alternative methodical injection of solvent and steam was proposed and tested earlier (Babadagli and Al-<br>Bahlani, 2008).