Effect of Acidic Components on the Dynamic Interfacial Tensions in Surfactant/Alkali/Acidic Crude Oil Systems

Abstract The acidic components have been extracted from the crude oil by solvents. The dynamic interfacial tensions (IFTs) in surfactant/alkali/acidic crude oil or the residual oil systems were investigated by spinning drop method. The transient, the minimum and the stable IFT values were obtained. It is shown that the acidic components play an important role in lowering IFTs between the alkaline solutions and the crude oil or affecting IFTs between the surfactant solutions and the crude oil when the ionic strength is low. The minima of dynamic IFTs are affected by both the adsorption-desorption barriers and the concentrations and the ratios of the interfacial active substances on the interfaces. ACKNOWLEDGMENT Financial support by the National Key Basic Research Development Program “Fundamental Studies of the Extensively Enhanced Petroleum Recovery” (Project Grant number G19990225) is greatly acknowledged.