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:
Jul. 02, 1991
Filed:
Dec. 31, 1990
Applicant:
Inventor:
Andrew Liao, Houston, TX (US);
Assignee:
Baroid Technology, Inc., Houston, TX (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252-8512 ; 252-851 ; 252-8513 ; 252-8514 ; 106 3835 ; 166285 ; 166294 ; 166295 ; 524-5 ;
Abstract
An additive for well servicing fluids containing a partially hydrolyzed acrylamide for use in downhole environments having a high calcium ion content comprising an alkali metal bicarbonate, a water-soluble carboxylic acid and a copolymer of acrylamide, an acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, the additive being used to formulate aqueous well servicing fluids, particularly drilling fluids, and for a method of treating an aqueous well servicing fluid containing partially hydrolyzed acrylamide to prevent unwanted reactions between calcium ions and the partially hydrolyzed polyacrylamide.