Improved stiff string torque and drag prediction using a computationally efficient contact algorithm by Sampath Liyanarachchi, Geoff Rideout

Subjects: “…Drill-string torque and drag…”
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Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration by Mohammad Javad Moharrami, Hodjat Shiri, Clóvis de Arruda Martins

Subjects: “…drill string…”
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Computer simulation of a drilling bit feed rate regulator comprising of a dc motor by O. V. Nikulin, V. A. Shabanov

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