C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/13, 166/33
C09K 8/584 (2006.01) E21B 43/22 (2006.01)
Patent
CA 1097054
26619 CORRELATION OF WEIGHTED EFFECT OF DIFFERENT IONS AND SURFACTANT COMPOSITION FOR SURFACTANT FLOOD Abstract of the Disclosure In the recovery of oil from a formation with an aqueous surfactant solution containing an anionic surfactant such as a petroleum sulfonate, a cosurfactant such as tertiary butyl alcohol, and an electrolyte, a specific surfactant system which is suitable for the given formation, is selected by: (1) analysing the formation brine and determining the total effective Na + concentration, on the basis that each part Ca++ is equivalent to about 14 parts Na+ and each part Mg++ is equivalent to about 16 parts Na+; (2) com- paring this total effective Na+ concentration with previously prepared phase- volume diagrams of surfactant systems partitioning into separate phases as a function of electrolyte consentration; and (3) adjusting the electrolyte concentration, hydropbobic content or the surfactant, or solubility of the alcohol to give a particularly effective system for recovering oil.
312937
Sitton Donald M.
Terry Ronald E.
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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