Siberian Federal University

The use of thermotropic chemical compositions for enhanced oil recovery in combination with cyclicsteam stimulation (CSS), in the Permian-Carboniferous deposit of the Usinsk high-viscosity oil field, Komi Republic, Russia, is considered. Among the wells under consideration there are both wells treated only with steam, and in combination with two types of chemical compositions, oil-displacing and flow-diverting. A comparison of the CSS effect for wells, where this treatment is used for the first time, with wells with multiple CSS, from two to ten times, has been carried out. It was concluded that the first cycle of the CSS is most effective for the wells just put into operation, and the use of chemical compositions is not necessary, however, for subsequent cycles it is recommended to use chemical compositions that will ensure additional residual oil recovery and reduction of production watercut