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:
Apr. 03, 1984
Filed:
Sep. 13, 1982
George M Holzwarth, Linden, NJ (US);
Exxon Research and Engineering Co., Florham Park, NJ (US);
Abstract
A process for recovering oil from a subterranean formation using a modified aqueous saline heteropolysaccharide solution as mobility control agent, said aqueous solution containing at least 0.5 wt. % of inorganic salts wherein the solutions are stabilized against loss of pyruvate groups on heat treatment by a process which comprises preparing an aqueous solution containing heteropolysaccharide and inorganic salts, adding a buffer to control pH between about 6.5 and 10.0, heating to a temperature of at least 100.degree. C. and maintaining the pH at from 6.0 to 9.5 during heating, then removing cell debris. The buffered solutions do not suffer loss of pyruvate content which leads to viscosity loss.