Stick-Slip Whirl Interaction in Drillstring Dynamics
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A Stick-slip Whirl Model is presented which is a simplification of an oilwell drillstring confined in a borehole with drilling fluid. The disappearance of stick-slip vibration when whirl vibration appears is explained by bifurcation theory. The numerical results are compared with the experimental data from a full-scale drilling rig.
Key wordsDrillstring vibrations discontinuous bifurcations stick-slip vibrations whirl non-smooth systems
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