Investigation of adsorption mechanisms in static conditions in order to reduce risks for the project of alkaline -surfactant - polymer flooding for conditions of West-Salymskoye field

Authors: A.A. Borodkin , M.Ya. Evseeva (Gazpromneft NTC, LLC, RF, Saint-Petersburg), Ya.E. Volokitin, M.Yu. Shuster, I.N. Koltsov (Salym Petroleum Development N.V., RF, Moscow), A.V. Sidelnikov (Bashkir State University, RF, Ufa)

Key words: chemical advanced recovery methods, alkaline -surfactant - polymer flooding, anionic surfactants , adsorption , phase transitions, adsorption isotherms.

Complex technology of alkaline- surfactant - polymer flooding is currently one of the most effective chemical advanced recovery methods. The losses of surfactant due to adsorption processes are related to significant risks in the commercial realization of this technology. Proper setting of experiments, the qualitative interpretation of their results, followed by modeling is one of the most important tasks at the design and optimization of alkaline- surfactant - polymer flooding for specific field conditions. A complex of experiments aimed at studying the adsorption processes in a given range of concentrations of surfactants on the sand packed tube, prepared from crushed core material of AC₁₁ reservoir of West Salymskoye field, is carried out. The main current tasks are statistical material exploratory work on the adsorption of surfactants on the rock, determination of the shape of the adsorption isotherms at different concentrations of salt, soda and polymer, search reagents to reduce the adsorption processes in the rock, interpreting the results by mathematical modeling methods.

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