Precession, which is the rolling motion of the drillstring on the walls of the borehole, is investigated by considering the various possible motions of a rotating disk in a circular hole. Due to the simplicity of the model, closed-form results are derived on the stability of precession and on the evolution of impacting motions towards precession. It is found that increasing coefficients of friction and contact damping have a favoring effect on precession, while the stiffness and damping of the drillstring bending mode have an opposing effect.

Issue Section:
Technical Papers
Keywords:
oil technology, vibrations, rolling friction, wear, rotation, stability, fatigue cracks
Topics:
Damping, Drill strings, Drilling, Flight, Friction, Rotation, Stability, Stiffness, Vibration, Wear, Rotating disks
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Copyright © 2001
 by ASME
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