Experimental studies of forward and backward whirls of drill-string

Marcin Kapitaniak, Vahid Vaziri, Joseph Páez Chávez, Marian Wiercigroch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)
37 Downloads (Pure)


In this work we investigate forward and backward whirls of a drill-string using a novel experimental drilling rig (Wiercigroch, 2010) capable of reproducing major types of drill-string vibration, including stick-slip, bit-bounce and whirling. We focus our attention on whirling motion of the Bottom Hole Assembly (BHA) with a particular attention to the co-existence of forward and backward whirls. We present experimental results, showing for the first time co-existing whirling solutions and characterizing the parameter space in which different whirls can be observed. Those results are then used to calibrate a simple mathematical model, which can be used for further studies of whirling phenomena.
Original languageEnglish
Pages (from-to)454-465
Number of pages12
JournalMechanical Systems and Signal Processing
Early online date5 Aug 2017
Publication statusPublished - 1 Feb 2018

Bibliographical note

The authors wish to thank BG Group plc for the financial support to this research.


  • experimental studies
  • drill-string dynamics
  • lateral vibration
  • forward and backward whirls
  • co-existing attractors


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