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


    Duy Nguyen and Nicholas Sadeghi

    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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