If, in addition to equivalence, oils are required to have equal viscosities and similar phase behavior as a function of surfactant concentration, then it may be possible to replace microemulsion floods of live crude at high pressure with floods of appropriately diluted dead crude at low pressure. It then becomes possible to introduce the idea of equivalent oils (Eqo's) as a replacement for the equivalent alkane carbon number (EACN), which is shown to lack some of the properties needed to implement efficient preliminary screening of microemulsions for EOR.īroadly speaking, oils are "equivalent" when they have the same molar volumes, optimal salinities, and solubilization parameters. When optimal salinity, Cϕ, and solubilization parameter Vo/Vs are augmented by oil molar volume, Vmo, the resulting three-parameter representation provides a more precise description of microemulsion phase behavior than has previously been available.
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