Patent ID: 8944190
Filing Date: 2015-02-03
Classification: E21B,F16F

Abstract:
1. A system configured to control vibration of a drill string during a drilling operation, the drill string including a drill bit at a downhole end of the drill string, the drill bit configured to define a borehole in an earthen formation, the system comprising: a controller configured to cause a damping force to be applied to the drill bit that is subject to vibration during the drilling operation; and at least one sensor configured to be in electronic communication with the controller, the at least one sensor configured to detect a displacement of the drill bit during the drilling operation, the at least one sensor further configured to transmit to the controller a signal that is indicative of the displacement of the drill bit when the at least one sensor is in electronic communication with the controller, the controller configured to, in response to the signal that is indicative of the displacement of the drill bit, vary the damping force to be applied to the drill bit as the drill bit is displaced due to the vibration.