Alkaline water flooding with a precipitation inhibitor for enhan

Details Alkaline water flooding with a precipitation inhibitor for enhan Alkaline water flooding with a precipitation inhibitor for enhan

1986-12-05

1987-12-22

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166273, 166275, E21B 4322

Patent

active

047141131

ABSTRACT:
An enhanced oil recovery method is provided utilizing an alkaline waterflood injection fluid including a water-soluble precipitation inhibitor such as a polyacrylate, an acrylate-containing copolymer, an organophosphonate, a carboxylate-containing organophosphonate or a polymaleic anhydride whereby divalent metal cations dissolved within the injection fluid or within the reservoir water in the immediate vicinity of the injection well are substantially prevented from precipitating. Additionally, the injection fluid preferably provides sufficient alkaline material whereby beyond the immediate vicinity of the injection well the permeability characteristics of the reservoir are modified by precipitation of, e.g., divalent metal hydroxides or divalent metal carbonates.

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