Creation of a new oil-displacing composition based on a triple system of deep eutectic solvents “pentaerythritol - urea - choline chloride” and surfactants
M. R. SHOLIDODOV, L. K. ALTUNINA, V. V. KOZLOV, A. R. SAIDENTSAL, V. A. KUVSHINOV, R. N. MUSTAFIN
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: deep eutectic solvents, donor-acceptor interaction, eutectic, oil displacement coefficient, methods of enhancing oil recovery, oil-displacing composition, surfactants, heavy and highly viscous oils
Abstract
The paper presents the results of creating a new oil-displacing composition based on the ternary system of deep eutectic solvents (DES) “pentaerythritol - urea - choline chloride” with surfactants, and the results of laboratory tests of its effect on the filtration characteristics of the heterogeneous formation of the Usinskoye field with heavy and high-viscosity oil. As a result of studying the physicochemical characteristics and phase equilibrium of the ternary DES system, a new oil-displacing composition of prolonged action was created, based on the ternary DES system “pentaerythritol - urea - choline chloride” and surfactant, applicable for various geological and physical conditions of fields, in particular in the Arctic zone of the Russian Federation. The effectiveness of the composition was assessed for sections of the field at the early and late stages of development. It has been established that the use of the composition based on DES and surfactants leads to the equalisation of filtration flows with an increase in formation coverage, restoration of the initial permeability and, as a consequence, to a significant increase in the oil displacement coefficient at both low and high temperatures.
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