Self-excited stick-slip oscillations of drill bits

Thomas Richard, Christophe Germay, Emmanuel M Detournay

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

This Note studies the self-excited stick-slip oscillations of a rotary drilling system with a drag bit, using a discrete model which takes into consideration the axial and torsional vibration modes of the bit. Coupling between these two vibration modes takes place through a bit-rock interaction law which accounts for both frictional contact and cutting processes at the bit-rock interface. The cutting process introduces a delay in the equations of motion which is ultimately responsible for the existence of self-excited vibrations, exhibiting stick-slip oscillations under certain conditions.

Original languageEnglish (US)
Pages (from-to)619-626
Number of pages8
JournalComptes Rendus - Mecanique
Volume332
Issue number8
DOIs
StatePublished - Aug 1 2004

Keywords

  • Delai
  • Delay
  • Drillstring vibrations
  • Dynamical systems
  • Self-excited vibrations
  • Stick-slip
  • Stick-slip (adhérence-glissement)
  • Systèmes dynamiques
  • Vibrations
  • Vibrations auto-entretenues
  • Vibrations du train de tiges de forage

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