Challenges and best practices for handling emulsions in chemical EOR flooding ///

Water soluble demulsifiers and oil soluble demulsifiers were used to treat the emulsion resulting from a CEOR (chemical enhanced oil recovery) project. The demulsifier greatly lowered water content in the oil phase–BS&W (basic sediment and water) <0.5%–and oil concentration in the water phase (less than 50 ppm). Application of this novel demulsifier resulted in a much more effective oil/water separation, with the production of dry oil and clean water at a pilot ASP (alkali, surfactant and polymer) flood that was experiencing very stable emulsions. The demulsification mechanism was also investigated in terms of elastic modulus, particle size and interfacial tension.

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