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:
Aug. 12, 2008
Filed:
Oct. 17, 2006
Henri Denoix, Chatenay Malabry, FR;
Henri Denoix, Chatenay Malabry, FR;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
An expandable drill bit comprises a body for mounting on a support string DS, a plurality of drill armsA,B,C,D,A,B,C,D coupled to the body and extending along a central longitudinal axis LL', and at least one drill arm supporting cutting elementsA. The plurality of drill armsA,B,C,D,A,B,C,D are pivotable between a retracted configuration and an expanded configuration. The retracted configuration defines an expandable drill bit having a first cutting diameter D. The expanded configuration defines an expandable drill bit having a second cutting diameter Dgreater than the first cutting diameter. The drill armsA,B,C,D,A,B,C,D are driven from the retracted configuration into the expanded configuration when the expandable drill bit is rotated at a speed of rotation at least equal to a determined expanding speed of rotation.