The particle size distribution of oil-water emulsion is one of important characteristics of emulsion for
alkaline/surfactant/polymer (ASP) flooding. In this paper, the various factors on particle size distribution of oil-water
emulsion are determined by using MS 2000 Micro laser particle size analyzer, the result showed that the emulsion
particles became fining by the added surfactant, but the surfactant concentration has little effects on particle size of
emulsions. With the salinity increase, the diameters of emulsion particles increased. The particle size becomes larger with
the addition of polymer. With the increase of polymer concentration, the diameters of emulsion particles increased and the
size distribution turned wider.