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TECHNICAL PAPERS

Stick-Slip and Bit-Bounce of Deep-Hole Drillstrings

[+] Author and Article Information
A. Baumgart

Institut für Technische Mechanik, TU Braunschweig, Postfach 3329, D-38023 Braunschweig, Germany

J. Energy Resour. Technol 122(2), 78-82 (Mar 31, 2000) (5 pages) doi:10.1115/1.483168 History: Received April 26, 1999; Revised March 31, 2000
Copyright © 2000 by ASME
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References

Figures

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Deep-hole drillstring and deflected cross section x
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Differential surface vector dai
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Angular velocity of motor stator Φ̇S and motor rotor/bit Φ̇B
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Rate of flow at x=3 km(q1) at the drillcollar top (q2) and through the motor (q3). Range 405 s<t<406 s is shown enlarged.
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Mud pressure at x=3 km(p1), at the drillcollar top (p2) and before the motor (p3) where pi is the difference between mud pressure in the pipe and its hydrostatic pressure
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Polar plot of evolution of the borehole profile of depth h over bit angle ΦB for 400 s<t<412 s

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