SURFACTANT FLOODING SYSTEM

摘要

SURFACTANT FLOODING SYSTEM A method for modifying a sulfonate surfactant flooding system so as to permit the use of fluids of increased salinity in the polymer drive. Sulfonate systems are altered by adding about 0.05% to about 1.0% by weight of a divalent metal cation to give a total concentration of about 0.1% to about 1.0% by weight of divalent metal cation to one or more surfactant slugs of the surfactant flooding system, and adding about 0.1% to about 1.5% by weight of a sulfate or sulfonate solubilizer to the polymer drive fluid. The concentration of oil soluble petroleum sulfonates may also be decreased while the concentration of water soluble petroleum sulfonates may be increased without a decrease in surfactant slug performance.