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:
Sep. 11, 1979
Filed:
Jul. 13, 1978
Applicant:
Inventor:
Evan H Street, Jr, Houston, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166307 ; 166308 ; 252 / ;
Abstract
In a well treating process in which an acidic solution having a pH of less than about 2 tends to dissolve ferric ion-containing materials from the well conduits and to precipitate ferric ion-containing solids when the pH of the solution increases beyond about 3, such a precipitation can be prevented by dissolving limited proportions of both 5-sulfosalicylic acid and citric acid within the acidic solution to be injected.