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:
Oct. 21, 2008
Filed:
May. 01, 2002
Applicants:
Billy G. Chesser, Coldsprings, TX (US);
Charles Perricone, Montgomery, TX (US);
George W. Bettge, Houston, TX (US);
Inventors:
Billy G. Chesser, Coldsprings, TX (US);
Charles Perricone, Montgomery, TX (US);
George W. Bettge, Houston, TX (US);
Assignee:
Baker Hughes Incorporated, Houston, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drilling fluid system comprising a brine and a quantity of cationic copolymers comprising a ratio of acrylamide monomers to cationic derivatives of acrylamide monomers, wherein the quantity and the ratio are effective to maintain effective rheology and fluid loss control in said drilling fluid system at temperatures of at least about 250° C. for at least about 16 hours.