On the dynamics of oilwell drillstrings with asynchronous motor drive

Recent work in stick-slip vibration quenching for drill pipes has been focused on models with distributed parameters where the drill pipe is assimilated to a rod. On the other hand it has been pointed out that the driving motor dynamics control may be helpful in reducing the breakdown/failures of the drilling devices. The present paper incorporates the dynamics of the induction driving motor. The influence of the control approach is discussed.