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Oil-well drilling process involves opening a borehole in selected rock formations as quickly and safely as possible. Drillstring torsional vibrations due to stick-slip phenomena yield large variations in the drilling angular velocity possibly damaging drill pipes and drill bits. Uncertainties in rock formation properties may prevent stable drilling when using standard linear proportional-integral (PI) control laws. This paper presents a methodology to design the control parameters using a robust criteria leading to a substantial increase in the performance robustness while not affecting much the nominal performance.

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This page is a summary of: Robust evaluation of stability regions of oil-well drilling systems with uncertain bit-rock nonlinear interaction, Journal of Sound and Vibration, September 2020, Elsevier,
DOI: 10.1016/j.jsv.2020.115481.
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