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. 04, 2016
Filed:
Mar. 07, 2011
William Evans Turner, Durham, CT (US);
Mark Hutchinson, Meriden, CT (US);
Dirk Bosman, Dubai, AE;
Mark Ellsworth Wassell, Houston, TX (US);
Carl Allison Perry, Middletown, CT (US);
Martin E. Cobern, Cheshire, CT (US);
William Evans Turner, Durham, CT (US);
Mark Hutchinson, Meriden, CT (US);
Dirk Bosman, Dubai, AE;
Mark Ellsworth Wassell, Houston, TX (US);
Carl Allison Perry, Middletown, CT (US);
Martin E. Cobern, Cheshire, CT (US);
APS Technology, Inc., Wallingford, CT (US);
Abstract
An apparatus and method for damping vibration, especially torsional vibration due to stick-slip, in a drill string, Sensors measure the instantaneous angular velocity of the drill string at one or more locations along the length of the drill string. One or more vibration damping modules are also spaced along the length of the drill string. When torsional vibration above a threshold is detected, the damping module imposes a reverse torque on the drill that dampens the torsional vibration. The reverse torque can be created by imparting a frictional resistance to the rotation of the drill string. The frictional resistance can be created externally, by extending friction pads from the damping module so that they contact the bore hole wall and drag along the bore hole as the drill string rotates, or internally by anchoring a housing mounted on the drill string to the wall of the bore hole and then imposing frictional resistance on a fluid, such as a magnetorheological fluid, flowing within the drill string.