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. 08, 2013
Filed:
Sep. 29, 2009
Applicants:
Ian Forster, Aberdeen, GB;
Alan Eddison, Aberdeen, GB;
Alastair Macfarlane, Aberdeen, GB;
Inventors:
Assignee:
National Oilwell Varco, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 7/00 (2006.01); E21B 7/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drilling method comprises controlling operation of a drill string to maintain at least a portion of the drill string in forward whirl.