With the trend toward deeper objectives, the time spent drilling through casing has increased with a consequent increase in casing wear. As a result of the expanded importance of casing wear, a research program was undertaken to investigate means to predict the rate of casing wear and means to reduce this wear rate. This paper presents experimental results on the effectiveness of drill pipe rubbers in reducing rotational casing wear and measurements of the rate of casing wear by rotating tool joints and drill pipe rubbers under simulated drilling conditions. The results from this paper and the results from reference [1] have been used to develop techniques for predicting casing wear under field conditions. These techniques are reported in reference [2].

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