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:
Mar. 31, 1992
Filed:
Feb. 25, 1991
Applicant:
Inventors:
Carl W Aften, Sugarland, TX (US);
Robert K Gabel, Sugarland, TX (US);
Assignee:
Nalco Chemical Company, Naperville, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166294 ; 1663051 ; 166307 ; 166308 ; 252-8551 ; 252-8553 ; 405264 ;
Abstract
A clay swelling inhibitor additive for oil and gas well treatment is disclosed. The additive comprises an aqueous solution of tetraalkylammonium chloride, preferably tetramethylammonium chloride and a quaternary amine-based cationic polyelectrolyte, such as methyl chloride quaternary salt of ethylene-ammonia condensation polymer. The additive composition synergistically retards water absorption by the down-hole clay formation.