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- W2080963990 abstract "Abstract A new drillstring dynamics model takes into account the interaction between the drill string and the instationary mud flow circulation. Most papers in the past neglected the influences of fluid-structure coupling forces and fluid flow excitation forces on drillstring dynamics. The drill string under consideration includes a Bottom Hole Assembly that consists of a PDC bit, a mud driven positive displacement motor, and optionally a Measurement While Drilling pulser. Besides mud flow vibrations, the assembly is excited by axial bit vibrations caused by a profiled bottomhole, motor imbalance and friction effects between the borehole wall and the string. Coupled axial, torsional, lateral and pressure vibrations are calculated. Simulation results include damaging bit bouncing, self excited stick-slip and whirl effects of the assembly. Vibration response of a positive pressure MWD pulser is also treated. The application helps to avoid critical operating conditions and to select the corresponding system parameters. Therefore a significant reduction in project cost can be achieved." @default.
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- W2080963990 date "2000-02-23" @default.
- W2080963990 modified "2023-09-28" @default.
- W2080963990 title "Drilling Dynamics in the Presence of Mud Flow" @default.
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- W2080963990 doi "https://doi.org/10.2118/59236-ms" @default.
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