Drillstring stress analysis techniques are reviewed with emphasis on the use of torque-drag formulations. Some of the many modifications to torque-drag calculations are reviewed and discussed. The limitations of current results in drillstring dynamics for use in stress analysis calculations are also discussed.

Keywords:
effective tension, equation, drillpipe, unit length, curvature, configuration, torque-drag calculation, hole wall, evaluation, stiffness
Subjects:
Drillstring Design, Torque and drag analysis
Copyright 1994, Society of Petroleum Engineers
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