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:
Jun. 30, 1992
Filed:
May. 28, 1994
Applicant:
Inventor:
C Darwin Williamson, Sugar Land, TX (US);
Assignee:
Nalco Chemical Company, , US;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23F / ; E21B / ;
U.S. Cl.
CPC ...
252-8552 ; 252-8553 ; 252-8555 ; 252146 ; 166311 ; 166312 ;
Abstract
A precipitation control composition comprises an iron sequestering agent and a ketone-type compound as sulfide modifier. The precipitation control composition is useful to retard undesirable precipitation of iron and sulfur species from an acid solution of increasing pH. In combination with an acid solution, the precipitate control composition comprises an acidizing composition which is particularly useful in the acidizing of sour hydrocarbon wells. Also disclosed is the method of retarding undesirable precipitation of iron and sulfur species from an acid solution of increasing pH.