Pp. 281-288 OIL-DISPLACING SURFACTANT COMPOSITION WITH CONTROLLED VISCOSITY FOR ENHANCED OIL RECOVERY FROM HEAVY OIL DEPOSITS L.K. Altunina, V.A. Kuvshinov, L.A. Stasyeva, I.V. Kuvshinov, V.V. Kozlov Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia Abstract. <...> To improve the efficiency of waterflooding or steam stimulation, enhanced oil recovery and intensification of development a thickened oil-displacing composition NINKA-Z has been created, based on surfactants with controlled viscosity and alkalinity, which is both water-diverting and oil-displacing composition. <...> When exposed to the reservoir with compositions NINKA-Z there is an increase in the final oil recovery by increasing the rate and factor of oil displacement, and sweep efficiency. <...> The paper gives the results of laboratory studies of thickened oil-displacing composition for enhanced oil recovery from deposits with high temperature and for steam stimulation – solation kinetics, physical-chemical and rheological properties of the composition solutions. <...> The composition has an adjustable viscosity and high oil-displacing ability; it retains, self-regulates in a deposit for a long time complex of colloidal-chemical properties, optimal for oil displacement purposes. <...> In 2014-2015 pilot tests were successfully conducted of the technology to enhance oil recovery using oil-displacing thickened composition NINKA-Z on the experimental plot of Permian-Carboniferous heavy oil deposit of the Usinsky field that being developed by steam stimulation. <...> Pilot projects have shown high efficiency of the technology, significant effects were received on increasing oil production, reduction of water cut and intensification of development. <...> Keywords: oil-displacing compositions, surfactants, alkaline buffers, urea, hydrolysis, CO2 , kinetics, rheology, viscosity, enhanced oil recovery, physical and chemical technologies, heavy oil, PermianCarboniferous deposit, Usinsky field, steam stimulation, pilot tests DOI: 10.18599/grs.18.4.5 For citation: Altunina L.K., Kuvshinov V.A., Stasyeva L.A., Kuvshinov I.V., Kozlov V.V. Oil-Displacing Surfactant Composition with Controlled Viscosity for Enhanced Oil Recovery from Heavy Oil Deposits. <...> DOI: 10.18599/grs.18.4.5 Russia is among the top ten countries with the largest oil reserves, on this indicator only being behind countries of the Middle East and Venezuela. <...> The main method of oil fields development in Russia is flooding, with its use about 95 % of oil is <...>