A mathematical model for the drilling process is derived and solved numerically as an initial value problem. The equations of motion are nonlinear differential equations for longitudinal, lateral, and rotational motion of the pipe as well as for the rate of flow and pressure of the mud. The model comprises a mud (Moineau) motor which rotates the bit relative to the lower end of the pipe. The model accounts for buckling of the pipe due to excessive torque and longitudinal forces, as well as for the effect of hydraulic pressure on the deformed pipe. Weight on bit and torque on bit are computed from characteristic curves which are functions of the penetration of the bit into the rock and the angular velocity of the bit. Numerical simulations show self-excited oscillations of the drillstring, including bit take-off from the bottom hole and large amplitudes in the bit’s angular velocity. [S0195-0738(00)00602-6]
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June 2000
Technical Papers
Stick-Slip and Bit-Bounce of Deep-Hole Drillstrings
A. Baumgart
A. Baumgart
Institut fu¨r Technische Mechanik, TU Braunschweig, Postfach 3329, D-38023 Braunschweig, Germany
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A. Baumgart
Institut fu¨r Technische Mechanik, TU Braunschweig, Postfach 3329, D-38023 Braunschweig, Germany
Contributed by the Petroleum Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by the Petroleum Division, April 26, 1999; revised manuscript received March 31, 2000. Associate Technical Editor: A.K. Wojtanowicz.
J. Energy Resour. Technol. Jun 2000, 122(2): 78-82 (5 pages)
Published Online: March 31, 2000
Article history
Received:
April 26, 1999
Revised:
March 31, 2000
Citation
Baumgart, A. (March 31, 2000). "Stick-Slip and Bit-Bounce of Deep-Hole Drillstrings ." ASME. J. Energy Resour. Technol. June 2000; 122(2): 78–82. https://doi.org/10.1115/1.483168
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