MODEL DEVELOPMENT AND VERIFICATION OF DRILL-STRING SIMULATION RESULTS FOR STICK-SLIP OSCILLATIONS
O. S. Bukashkina, V. S. Tikhonov
OOO Akvatik - Buril’nye Truby, Moscow, Russia
Keywords: drill string, stick-slip oscillation, cutting model, simulation result, field test data, comparative analysis
Abstract
A model for coupled axial-torsional oscillations of a drill string in a borehole of arbitrary profile is proposed. A numerical solution scheme is developed. A comparative analysis of the simulation results and field test data is performed. The main factors influencing the onset of stick-slip oscillations are identified as the intrinsic specific energy of rock destruction and the rotor speed. Comparison of the calculated results with field measurements demonstrates the adequacy of the model, with an accuracy acceptable for practical applications.
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