The Effect of Dynamical Parameters on Precession in Rotary Drilling

[+] Author and Article Information
A. Théron

Département de Mécanique et Technologie, Commissariat à l’Énergie Atomique, Saclay, 91191 Gif-sur-Yvette, France

E. de Langre

LadHyX, CNRS, École Polytechnique, 91128 Palaiseau, France

C. Putot

Institut Français du Pétrole, 92852 Rueil-Malmaison, France

J. Energy Resour. Technol 123(3), 181-186 (Apr 10, 2001) (6 pages) doi:10.1115/1.1383974 History: Received June 10, 1999; Revised April 10, 2001
Copyright © 2001 by ASME
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Evolution of the rate of precession Ω̄ depending on its initial value and on the rate of rotation ω̄: (○) evolution to a loss of contact. (⋅) evolution to a stable precession. Cases (a), (b), (c). (d) refer to the text.
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Effect of mechanical parameters on the trajectory in the borehole. Unless otherwise specified, the parameters are μ=.2,η=.005,ωB/ω=1.15,ξ=.1. (a) Effect of the coefficient of friction; (b) effect of the impact damping coefficient; (c) effect of the frequency of bending; (d) effect of the flexural damping.
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Evolution from impacting motions to precession—(a) friction, but no impact damping; (b) impact damping, but no friction; (c) general case: friction and impact damping
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Law of impact—(a) normal velocity after impact as a function of the normal velocity before impact; (b) angle of rebound as a function of the angle of impact
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Simplified mechanical model
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Precession of a rotating drillstring




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