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:
Feb. 19, 2002
Filed:
May. 14, 1999
Applicant:
Inventors:
Bruno Langlois, Des Bois, FR;
Joël Benchimol, Francqueville, FR;
Gilles Guerin, Eaubonne, FR;
Isabelle Vincent, Evreux, FR;
Alain Senechal, Charenton, FR;
Robert Cantiani, Lyon, FR;
Assignee:
Rhodia Chimie, Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 7/00 ; C09K 7/02 ;
U.S. Cl.
CPC ...
C09K 7/00 ; C09K 7/02 ;
Abstract
The present invention relates to a drilling fluid comprising cellulose nanofibrils comprising at least 80% of cells with primary walls and charged with carboxylic acids and with acidic polysaccharides, alone or as a mixture. This additive, alone, gives the drilling fluid shear-thinning properties and is stable up to temperatures of about 180° C.