Correlation of weighted effect of different ions and surfactant

Details Correlation of weighted effect of different ions and surfactant Correlation of weighted effect of different ions and surfactant

1977-06-06

1978-10-31

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166273, E21B 4322

Patent

active

041228952

ABSTRACT:
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) analyzing the formation brine and determining the total effective NA.sup.+ concentration, on the basis that each part Ca.sup.++ is equivalent to about 14 parts Na.sup.+ and each part Mg.sup.++ is equivalent to about 16 parts Na.sup.+ ; (2) comparing this total effective Na.sup.+ concentration with previously prepared phasevolume diagrams of surfactant systems partitioning into separate phases as a function of electrolyte concentration; and (3) adjusting the electrolyte concentration, hydrophobic content of the surfactant, or solubility of the alcohol to give a particularly effective system for recovering oil.

REFERENCES:
patent: 3330344 (1967-07-01), Reisberg
patent: 3371710 (1968-03-01), Harvey et al.
patent: 3467190 (1969-09-01), Dunlap et al.
patent: 3477508 (1969-11-01), Hurd
patent: 3623553 (1971-11-01), Burdge
patent: 3637017 (1972-01-01), Gale et al.
patent: 3648770 (1972-03-01), Sydansk et al.
patent: 3677344 (1972-07-01), Hayes et al.
patent: 3885628 (1975-05-01), Reed et al.
patent: 4074755 (1978-02-01), Hill et al.

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