The presence of a filter cake resulted in friction coefficient values for sand and silty-sand to reduce from 0.33 and 0.36, to 0.23 and 0.24, respectively. In the case of clay and silty-clay, friction values dropped from 0.29 and 0.39 without filter cake, to 0.25 and 0.27, respectively, due to the presence of a properly deposited filter cake. Thus, the utilization of proper drilling fluid mixtures allows smaller rigs to pull thermoplastic pipes over substantially longer distances without over-stressing the pipe product, thus improving the overall cost effectiveness of such projects and reducing construction-related risks.
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