Abstract
Oil-in-water and water-in-oil emulsions offer considerable promise as oil recovery agents. They can provide mobility control in certain situations, and may even serve as blocking agents. This paper examines selected aspects of emulsion characteristics, and flow in porous media, in the context of laboratory experiments. Oil-in-water and water-in-oil emulsions were prepared using surfactants, acid, an basic solutions. The emulsions were characterized by rheology, quality, and drop size distributions. These properties were measured before and after passage through a porous medium of known pore size distribution. The results show that the drop size retained - hence mobility control - is rate-dependent and related to pore size distribution. A number of emulsions were used in oil recovery experiments, and the results were compared with similar floods using caustic solutions. It is concluded that emulsions can be effective oil recovery agents.
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