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:
Jul. 04, 2000
Filed:
Feb. 25, 1998
Bruno Best, Rijswijk, NL;
Markus Antonius Van Buren, Rijswijk, NL;
Shell Oil Company, Houston, TX (US);
Abstract
A method of operating a drill string tool for use in a wellbore formed in an earth formation is provided. T he method comprises rotating an upper drill string part while a rotation transfer assembly transfers the rotation of a first element to a second element so as to rotate a lower drill string part in order to drill a section of a wellbore, inducing a controller to disengage the rotation transfer assembly so as to allow the first element to rotate relative to the second element by virtue of bearings, and rotating the upper drill string part about its longitudinal axis while the lower drill string part remains substantially stationary.