CO.sub.2 -Induced in-situ gelation of polymeric viscosifiers for

Details CO.sub.2 -Induced in-situ gelation of polymeric viscosifiers for CO.sub.2 -Induced in-situ gelation of polymeric viscosifiers for

1984-02-09

1986-02-11

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166272, 166273, 166294, 166295, 523130, E21B 33138, E21B 4322, E21B 4324

Patent

active

045693935

ABSTRACT:
A water permeability contrast correction process to improve the sweep efficiency of waterflooding which involves the sequential injection of (1) an optional aqueous preflush slug to adjust connate water salinity, (2) an aqueous thickened slug comprising a sequestered polyvalent metal cation such as aluminum citrate and a gelable polymeric viscosifier such as polyacrylamide, (3) carbon dioxide to decrease the pH of the polymer slug which triggers the delayed in-situ gelation of said thickened slug to preferentially decrease water permeability in highly permeable thief zones, and (4) an aqueous drive fluid.

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