This paper focuses on the issue of effective technology for extracting high-viscosity oil from heterogeneous reservoirs. The study examines methods for enhancing oil recovery from depleted fields containing high-viscosity oil. Three different reservoir impact methods are analysed in this research. Two of these methods are well known in oil production practice: polymer flooding and oil displacement using a water-gas mixture. The results obtained from these experiments are compared with the outcomes of the proposed combined impact method. The experiments utilized oil with a viscosity of 205 mPa·s at 20°C. In all conducted experiments, the first stage involved oil displacement using distilled water. In the first scenario, after the initial stage, a slug of polymer solution was injected and subsequently pushed forward by distilled water. In the second scenario, a slug of polymer solution was injected and then displaced using a water-gas mixture. In the third scenario, after the initial stage, oil displacement continued by injecting a water-gas mixture into the porous medium. A comparative analysis of the conducted experiments showed that the worst result was obtained when only the polymer solution slug was used. The effectiveness of the combined impact technology based on a polymer solution slug with a 0.25% concentration and a water-gas mixture was found to be approximately equal to that of using only a water-gas mixture with a high water-gas ratio.

Keywords: polymer, concentration, solution, water-gas mixture, oil recovery factor

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