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The importance of capillary forces in oil mobilization from Sandstone cores

Summary Capillary forces are one of the most important drive mechanisms in oil mobilization. The effectiveness of the capillary forces can be induced or reduced by several factors like viscosity, density, IFT, etc. Furthermore, different water injection rates into a rock system might be an indication of the action or not of the above forces. Previous experimental work has shown that the ultimate oil recovery can be achieved at slightly water-wet conditions or in a strongly water environment created by wettability alteration EOR processes like Smart Water. With this wettability alteration with Smart Water, capillary forces are induced and thus a high oil recovery is obtained. In this study, two strongly water-wet outcrop Bandera Brown core material were exposed to two different viscosity mineral-based oils and underwent a set of oil recovery tests.