Acid Oil-Displacing Composition of Prolonged Action Based on Deep Eutectic Solvents
L. K. ALTUNINA, L. A. STASYEVA, V. A. KUVSHINOV, M. R. SHOLIDODOV, V. V. KOZLOV, I. V. KUVSHINOV
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: enhanced oil recovery, deep eutectic solvents, phase diagrams, eutectics, acid composition, surfactants, oil displacement, high-viscosity oils, field tests
Pages: 136-148
Abstract
To enhance oil recovery and intensify the development of fields with hard-to-recover reserves, including the deposits of high-viscosity oils, acid oil-displacing compositions with prolonged action have been developed on the principles of green chemistry using the method of deep eutectic solvents (DES). These compositions are based on surfactants and an adduct of inorganic acid, polyol and carbamide. As a result of experimental studies of acid-base equilibria in three-component systems with donor-acceptor interactions “boric acid - carbamide - polyol (glycerol, pentaerythritol)”, which are DES, the optimal compositions and concentration ranges of the components in acid compositions were determined. The results of laboratory studies and pilot tests of enhanced oil recovery technology with the use of acid compositions are presented. The compositions are compatible with mineralized formation waters, have a low freezing point ((-20)-(-50) °С) or a solid commodity form, low interfacial tension at the boundary with oil, are applicable in a wide temperature range (from 10 to 200 °C), provide effective oil displacement and prolonged impact on the formation. The acid GBA composition showed high efficiency under field conditions during pilot work in the experimental areas of the Permian-Carboniferous deposit of high-viscosity oil of the Usinsk oil field, developed under natural conditions and under thermal steam exposure, and was recommended for industrial use. The technology is environmentally friendly and technologically efficient. The industrial use of technologies for enhanced oil recovery and intensification of oil production is promising, which will make it possible to extend the profitable operation of fields at a late stage of development, to involve the fields with hard-to-recover oil reserves into development, in particular the deposits of high-viscosity oils, in a wide range of climatic conditions, including the northern regions and the Arctic.
DOI: 10.15372/CSD2023448
EDN: DRMUMX
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