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:
Apr. 07, 2015
Filed:
Mar. 15, 2013
Applicant:
Superior Graphite Co., Chicago, IL (US);
Inventors:
Changjun Zhou, Chicago, IL (US);
David J. Derwin, Prospect Heights, IL (US);
Frank A. Wawrzos, McHenry, IL (US);
Assignee:
Superior Graphite Co., Chicago, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K 8/00 (2006.01); C09K 8/05 (2006.01); C09K 8/14 (2006.01); C09K 8/03 (2006.01); C09K 8/035 (2006.01); C09K 8/50 (2006.01);
U.S. Cl.
CPC ...
C09K 8/032 (2013.01); C09K 8/035 (2013.01); C09K 8/50 (2013.01);
Abstract
A method for controlling the loss of drilling fluid from an oil well borehole into formations penetrated by a drill bit is disclosed by which resilient graphitic carbon particles having a resiliency greater than about 130% rebound after compression to 10,000 psi; a degree of graphitization greater than 85%, as measured by d002 using XRD; an average pore size larger than 0.035 micron; and an aspect ratio smaller than 0.63 are added to the drilling fluid.