Ibukunolu O Oladunjoye, Vahid Vaziri, James Ing, and Sumeet S. Aphale
Drill-string dynamics, stick-slip oscillation, drrill-string bifurcation, stick-slip severity
Bifurcations are an interesting class of dynamic behavior
exhibited by many nonlinear systems. Drill string typically
employed in underground oil exploration are highly
nonlinear systems whose dynamic behavior has generated huge research interest. Though it is well-known that typical drill-strings behave like piecewise smooth systems and the severity of bifurcations they exhibit has not been studied in depth. In this work, a two degree of freedom (2-DOF) model of the drill-string is constructed and its dynamic behavior. In-depth analysis of the effect of parameter variation on the severity of bifurcations is conducted. This can potentially deliver key insights in the design of control strategies aimed at suppressing problematic stick-slip oscillation.