International Applied Mechanics

, Volume 43, Issue 9, pp 1017–1023 | Cite as

Effect of the length of a rotating drillstring on the stability of its quasistatic equilibrium

  • V. I. Gulyaev
  • P. Z. Lugovoi
  • V. V. Gaidaichuk
  • I. L. Solov’ev
  • I. V. Gorbunovich


A mathematical model is proposed to describe the critical quasistatic equilibrium of long rotating drillstrings. The prestress of drillstrings by the gravity and torsion forces, the gyroscopic interaction of rotary and linear motions, and the destabilizing effect of the internal flow of the drilling fluid are taken into account. The phenomena accompanying the drilling to different depths are studied numerically


drillstring deep-hole drilling quasistatic equilibrium critical states 


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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • V. I. Gulyaev
    • 1
  • P. Z. Lugovoi
    • 1
  • V. V. Gaidaichuk
    • 2
  • I. L. Solov’ev
    • 1
  • I. V. Gorbunovich
    • 3
  1. 1.National University of TransportKyivUkraine
  2. 2.S. P. Timoshenko Institute of MechanicsNational Academy of Sciences of UkraineKyiv
  3. 3.National University of Construction and ArchitectureKyivUkraine

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