Ion exchange controlled chemically aided waterflood process

Details Ion exchange controlled chemically aided waterflood process Ion exchange controlled chemically aided waterflood process

1977-03-21

1978-02-21

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166273, 166274, E21B 4322

Patent

active

040747557

ABSTRACT:
A process for recovering oil by successively injecting at least a chemical slug containing an active aqueous surfactant system or thickened aqueous liquid and an aqueous drive liquid into a reservoir having a significant amount of ion exchange capacity, is improved. The ionic composition of each injected fluid is arranged to provide a ratio, between the concentration of its effectively predominate monovalent cation and the square root of the concentration of its effectively predominate divalent cation, which ratio at least substantially equals such a ratio within the aqueous fluid immediately ahead of the injected fluid.

REFERENCES:
patent: RE29219 (1977-05-01), Flournoy et al.
patent: 3343597 (1967-09-01), Gogarty et al.
patent: 3467190 (1969-09-01), Dunlap et al.
patent: 3482631 (1969-12-01), Jones
patent: 3648770 (1972-03-01), Sydansk et al.
patent: 3677344 (1972-07-01), Hayes et al.
patent: 3908764 (1975-09-01), Harvey
patent: 4008767 (1977-02-01), Waite
patent: 4008768 (1977-02-01), Birk

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