Gel method for decreasing permeability around a wellbore

Details Gel method for decreasing permeability around a wellbore Gel method for decreasing permeability around a wellbore

1990-09-07

1991-12-31

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166295, 166300, 2523153, E21B 33138

Patent

active

050763610

ABSTRACT:
The invention is a method for decreasing formation permeability in an underground formation around a wellbore by injecting an aqueous fresh water solution comprising about 0.9% to about 3.0% by weight of hydroxy propyl cellulose having an average molecular weight greater than about 1,000,000 and about 0.4% to about 3.0% by weight of an alkali metal dodecyl sulfate in the ratio of about 3:1 to about 1:1.5 of cellulose to sulfate, said formation must contain a connate brine having a salinity greater than about 20,000 ppm TDS, or an injected brine having a salinity greater than about 20,000 ppm TDS to mix and react with the aqueous solution to form a gel. The invention is also a method for forming a high viscosity gel by mixing hydroxy propyl cellulose, alkali metal dodecyl sulfate and sufficient salinity.

REFERENCES:
patent: 2034347 (1936-03-01), Lommis et al.
patent: 2439833 (1948-04-01), Wagner
patent: 3241612 (1966-03-01), Hiller
patent: 4039029 (1977-08-01), Gall
patent: 4172055 (1979-10-01), DeMartino
patent: 4378049 (1983-03-01), Hsu et al.

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