The formation of a stable emulsion due to the penetration of water-based drilling fluids into the formation is one of the reasons of the decrease of new oil wells performance. It is impossible to prevent completely the penetration of drilling fluids and their filtrates into the formation. Therefore, the research was carried out to develop a method for preventing the formation of stable emulsions during the terrigenous formation exposing on the fields in Eastern Siberia. The materials from publications in the scientific and technical literature were used in the work. The optimal method of achieving the goal that is conforming to the geological conditions was found based on extensive experience. The application features of alkylbenzene sulfonat (sulfonol) in a mineralized environment were taken into account. Physical modeling of the interaction of the mineralized drilling fluid and its filtrate with crude oil demonstrated a possibility of formation of stable highly viscous emulsions. The laboratory studies and experiments were carried out to study the effect of sulfonol on the parameters and properties of the drilling fluid. The adding of sulfonol prevented the formation of stable emulsions during physical modeling of the interaction of the drilling fluid and its filtrate with crude oil. Filtration experiments were carried out to determine a core permeability coefficient after exposure to model drilling fluid filtrates and emulsion models with and without the addition of sulfonol on identical core columns under conditions simulating reservoir. There was a significant increase in the core permeability coefficient. Thus, the ability of sulfonol to prevent the formation of stable highly viscous emulsions when interacting with crude oil was confirmed. The considered method for improving the composition of mineralized drilling fluid is characterized by ease of implementation and low cost.
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