Abstract
Some anionic, cationic, and nonionic surfactants have been examined on actual reservoir samples. Thin section analysis and core flooding techniques were used for the petrophysical and mineralogical assessments of the rock samples. Spontaneous imbibition experiments were conducted using oil-saturated plugs in combination with reservoir brine and surfactant solutions separately. Capillary pressure measurements were conducted both before and after wettability alteration. Amott-Harvey and USBM wettability indices were determined. Brooks-Corey and Brooks-Corey-Mualem models were used. Among the surfactants a cationic one could best improve the spontaneous imbibition. Fairly good fit was observed between experimental capillary pressure curves and those calculated by Brooks-Corey model.
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