Selective plugging of highly permeable subterranean strata by in

Wells – Processes – Cementing – plugging or consolidating

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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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patent: 3782467 (1974-01-01), Hessert
patent: 3785437 (1974-01-01), Clampitt et al.
patent: 3795276 (1974-03-01), Eilers et al.
patent: 3815681 (1974-06-01), Richardson

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