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:
Aug. 06, 1991
Filed:
Nov. 27, 1989
Michael W Wyganowski, Calgary, CA;
Alberta Energy Company Ltd., Calgary, CA;
Amoco Canada Petroleum Company Ltd., Calgary, CA;
Diminex (Canada) Limited, Calgary, CA;
Abstract
This invention relates generally to a method for reducing the reactivity of steam or mixtures of steam and condensate in enhanced oil recovery. More particularly, the method of the invention comprises pH control through the injection or addition of either or both of ammonia and an ammonium salt of an organic or inorganic acid, such as ammonium chloride, to the feed water used to generate the steam or to the steam itself. This inhibits the dissolution of certain mineral groups, controls the migration of fines, inhibits the swelling of clays, controls chemical reactions in which new clay minerals are formed, and helps to prevent the precipitation of asphaltenes and the formation of emulsions as a result of steam injection.