☆ 4.7 Article

Distributed model for the drill-string system with multiple regenerative effects in the bit-rock interaction

JOURNAL OF SOUND AND VIBRATION (2024)

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Control of Axial-Torsional Dynamics of a Distributed Drilling System

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Summary: In this article, an active control strategy based on a distributed drill-string model is proposed to suppress self-excited vibrations, which are a main cause of failure and efficiency reduction in drilling operations. The drill-string model includes the coupled axial-torsional dynamics through the bit-rock interaction. A compensator is designed as a first step to mitigate reflective waves and eliminate neutral terms and some time delays, followed by the design of a stabilizing controller based on parametric feedback control law. A causal controller is achieved by designing a predictor using only top-side measurements. The effectiveness of the proposed controller is illustrated through a simulation-based case study, demonstrating its robustness against uncertainties and noise.

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