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Surfactant formulations that give rise to ultra-low interfacial tensions are used to enhance the recovery of crude oil by eliminating the trapping effects of capillary forces. The formulations, when mixed with oil, often give microemulsion-type phase behaviour. Depending on the surfactant affinity for oil and water, the microemulsion may exist as water-in-oil (L2), oil-in-water (L1), or bi-continuous...
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