Retreatment of wells to reduce water production

Details Retreatment of wells to reduce water production Retreatment of wells to reduce water production

1975-11-06

1977-08-02

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166270, 166273, E21B 33138, E21B 4322

Patent

active

040390292

ABSTRACT:
A process is provided for reducing water production in production oil wells or for altering the water permeability profile of injection wells that have been previously treated with partially gelled or ungelled polymer and from which oil has been produced for a period of time subsequent to the treatment. The retreatment is made by injecting into the formation an ionic solution capable of crosslinking residual ungelled polymer in the formation and thereafter injecting into the formation an aqueous solution of polymer capable of being crosslinked by the ionic solution. In a preferred embodiment aluminum citrate is injected into an underground formation that has previously been treated with an ungelled polymer selected from among polyacrylamides, partially hydrolyzed polyacrylamides, polysaccharides, carboxymethylcellulose, polyvinyl alcohol, polystyrene sulfonates, and the like, with the aluminum citrate being followed with a solution of an at least partially ungelled polymer selected from those above named.

REFERENCES:
patent: 3308885 (1967-03-01), Sandiford
patent: 3396790 (1968-08-01), Eaton
patent: 3613790 (1971-10-01), Stout et al.
patent: 3687200 (1972-08-01), Routson
patent: 3762476 (1973-10-01), Gall
patent: 3785437 (1974-01-01), Clampitt et al.
patent: 3809160 (1974-05-01), Routson
patent: 3833061 (1974-09-01), Gall

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