SPE-212536-MS PDF 4 - Modeling of Axial Rotary Drilling Dynamics as a Step Towar

Analysis of low frequency axial drilling dynamics from block velocity input to surface<br>weight on bit (SWOB) or differential pressure outputs, shows significant regional<br>variation. This range in dynamics poses a robustness challenge for automated drilling<br>control systems. Many factors influence drilling dynamics such as pipe stiffness, mud<br>properties, tortuosity, friction, bit design, and BHA geometry. A simple analytic model<br>representing axial drilling dynamics is described and compared to a finite element drilling<br>model and to drilling data. The analytic model shows that axial drilling dynami

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SPE-212536-MS PDF 4 - Modeling of Axial Rotary Drilling Dynamics as a Step Towar

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