Wells – Processes – Cementing – plugging or consolidating
Patent
1983-11-16
1985-02-12
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166273, E21B 4322, E21B 4320, E21B 33138
Patent
active
044985398
ABSTRACT:
A water permeability correction process, and composition therefor, 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, a gelable polymeric viscosifier such as polyacrylamide, and a hydrolyzable-pH-adjusting ester effective for delayed decreasing of the pH of the polymer slug which triggers in situ gelation to preferentially decrease water permeability in highly permeable thief zones, and, preferably, (3) an aqueous drive fluid.
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Carver Lyell H.
Kisliuk Bruce M.
Novosad Stephen J.
Phillips Petroleum Company
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