The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 1991
Filed:
Sep. 07, 1990
Douglas G Naae, Houston, TX (US);
Lawrence E Whittington, Katy, TX (US);
Texaco Inc., White Plains, NY (US);
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.