In-situ formation of polyvalent metal ions for crosslinking poly

Details In-situ formation of polyvalent metal ions for crosslinking poly In-situ formation of polyvalent metal ions for crosslinking poly

1985-06-03

1986-12-23

Suchfield, George A.

Wells

Processes

Separate steps of fracturing or attacking formation

166271, 166273, 166294, 166295, 405264, E21B 33138

Patent

active

046306781

ABSTRACT:
A water permeability contrast correction process to improve the sweep efficiency of waterflooding in carbonate-bearing strata which involves a sequential injection of (1) an optional aqueous preflush slug to adjust connate water salinity, (2) a slug of aqueous polymer gelable with polyvalent metal cations, such as an polyacrylamide, (3) an acidic aqueous solution effective to dissolve some of the carbonate and at least therefrom polyvalent metal cations specifically calcium or magnesium or both effective to gel said polymer, wherein said aqueous polymer and acidic solution can be injected together in a single slug, followed by (4) an additional aqueous polymer solution injection, wherein the acidic solution provides polyvalent metal cations in-situ for gelation of said polymer slug to preferentially decrease water permeability in highly permeable thief zones, and (5) an aqueous drive fluid.

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