Unique salinity for oil recovery surfactant system

Details Unique salinity for oil recovery surfactant system Unique salinity for oil recovery surfactant system

E - Fixed Constructions

21

B

166/33, 73/92

E21B 43/22 (2006.01) C09K 8/584 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1136985

UNIQUE SALINITY FOR OIL RECOVERY SURFACTANT SYSTEM Abstract of the Disclosure A series of surfactant systems is prepared at varying electrolyte concentrations, each system being mixed with oil to be displaced or its equivalent and allowed to equilibrate to determine the salinity at which the microemulsion phase has approximately equal volumes of oil and water; thereafter additional series of such surfactant systems are prepared utilizing different cosurfactants; thereafter the resulting surfactant systems are used at their optimal salinity (i.e., the salinity at which approximately equal volumes of oil and water are taken up into the microemulsion phase) to recover oil from test cores and the resulting oil recovery plotted versus the salinity to give the unique salinity at which maximum oil recovery is obtained for the particular oil-surfactant combination.

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