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.
The Effect of Dynamical Parameters on Precession in Rotary Drilling
Contributed by the Petroleum Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by the Petroleum Division, June 10, 1999; revised manuscript received April 10, 2001. Editor: A. K. Wojtanowicz.
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The´ron, A., de Langre, E., and Putot, C. (April 10, 2001). "The Effect of Dynamical Parameters on Precession in Rotary Drilling ." ASME. J. Energy Resour. Technol. September 2001; 123(3): 181–186. https://doi.org/10.1115/1.1383974
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