An instrumented drill stem member was used by Esso Production Research Company to record drill stem axial load, torsional load, bending, and rates of changing in these three values. Interpretation of these data from selected runs is used to show variation in drill stem torque at the kelly, at the top of the collars, and near the bit. Data taken near the bit demonstrate erratic bit rotation and bit loading and suggest large torsional vibrations in the drill stem. Data recorded at the kelly and near the bit indicate substantial axial and torsional vibration damping by one type of vibration damping tool. Suggestions are made for further investigations.

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