Patent ID: 9121233
Filing Date: 2015-09-01
Classification: E21B,F16F

Abstract:
1. An apparatus for reducing vibration in a downhole component, comprising: an electrically conductive auxiliary mass attached to the downhole component and configured to vibrate in a direction corresponding to a direction of downhole component vibration and absorb a portion of the downhole component vibration; and a magnetic component configured to generate a magnetic field through the auxiliary mass having a direction at least partially perpendicular to the direction of auxiliary mass vibration, the magnetic field configured to induce a current in the auxiliary mass in response to the auxiliary mass vibration; the apparatus having an auxiliary mass vibration frequency tuned relative to a selected natural vibration frequency of the downhole component to reduce vibration of the downhole component, the auxiliary mass vibration frequency based on a magnetic stiffness of the auxiliary mass, the magnetic stiffness based on at least a strength of the magnetic field and a resistance of the auxiliary mass.