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. 22, 1987
Filed:
Jun. 22, 1987
Applicant:
Inventors:
Andrew Nigrini, La Habra Heights, CA (US);
Liming Hsueh, Buena Park, CA (US);
Assignee:
Chevron Research Company, San Francisco, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ; E21B / ;
U.S. Cl.
CPC ...
166252 ; 166272 ; 166303 ; 166902 ;
Abstract
A method of inhibiting the dissolution of the gravel pack and silicate- or carbonate-containing formations subjected to steam-enhanced oil recovery processes while inhibiting the corrosion of mild steel. The method includes the controlled addition of a salt to the steam feed water to maintain the pH of the residual liquid phase in the range of from 8 to 10. Preferred salts are ammonium salts, such as ammonium sulfate and ammonium chloride.