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:
Feb. 27, 1990
Filed:
Dec. 02, 1988
Liming Hsueh, Buena Park, CA (US);
Marion G Reed, Hacienda Heights, CA (US);
Chevron Research Company, San Francisco, CA (US);
Abstract
A method for inhibiting permeability damage of a hydrocarbon formation containing clay minerals in the vicinity of a well penetrating the formation. It comprises: injecting a wet steam that includes (a) an amount of ammonia in the vapor phase of the wet steam to produce a concentration of ammonium ions in the vapor phase condensate of the wet steam effective to inhibit permeability damage of the formation in the vicinity of the vapor phase, and (b) an amount of a bicarbonate salt of the alkali metals, or mixtures thereof, effective to raise the liquid phase pH of the wet steam to within the range of about 7.5 to about 10.5.