The Effect of Rock-crude Oil-fluid Interactions on Wettability Alteration of Oil-wet Sandstone in the Presence of Surfactants

摘要

The aim of the present work was to study the rock-fluid interaction in presence of surfactants and thereby their effects on wettability alteration of oil-wet sandstone for its essentiality in enhanced oil recovery. Characterization of sandstone sample and its interaction with crude oil, brine and surfactants were investigated by Fourier Transform Infrared spectroscopy. Scanning electron microscope and X-ray diffraction studies were performed to characterize the sandstone sample. Critical micelle concentrations of sodium dodecyl sulfate, cetyltrimethylammonium bromide, Tergitol 15-S-7, Tergitol 15-S-9, and Tergitol 15-S-12 were determined by interfacial tension measurement method. Wettability alteration of sandstone was studied by contact angle method.