Siberian Federal University

The paper presents the results of laboratory testing of new acid compositions based on surfactants, an adduct of inorganic acid, and polyols (glycerol and sorbitol) in the process of displacement of a heavy high-viscosity oil. The experiments were carried out using an equipment for physical modeling of the oil displacement process. The effectiveness of the new acidic compositions was evaluated in respect to the conditions of the fields at the early and late stages of development. As a result of the study, it has been found out that the use of acid compositions based on glycerol and sorbitol led to an equalization of filtration flows with an increase in reservoir sweep, return to the initial permeability and, as a consequence, to a significant increase in the oil displacement efficiency both at low and high temperatures