The article presents the results of studies of phase equilibrium in the ternary system of deep eutectic solvents (DES) ‘boric acid - glycerine - urea’, which form the basis of oil displacing composition based on DES and surfactants (surfactants) for enhanced oil recovery, as well as laboratory studies of the effect of the composition based on DES and surfactants developed at the Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences on the filtration characteristics of a heterogeneous carbonate reservoir of the Usinskoye field and the oil displacement ratio. Compositions on the basis of DES and surfactants for oil recovery enhancement have the following unique properties, which are the advantage of the composition: high oil displacing ability; bifunctionality - works as an acid and oil displacing composition; complex effect on the formation - interaction with reservoir rock and formation fluids; adjustable viscosity; evolution under the action of formation conditions - hydrolysis of urea, which is a part of the composition, shifts the value of the hydrogen index of pH to the alkaline region. The physical modelling method was used to evaluate the
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