This study presents experimental results and techniques that are developed for measuring in-situ cuttings concentration using nuclear densitometers under dynamic conditions. One of the key problems in borehole hydraulics and cuttings transport is the determination of in-situ cuttings concentration in the borehole while drilling. In order to investigate cuttings transport efficiency with aerated fluids under elevated pressure and temperature conditions, in-situ cuttings concentrations were measured manually (i.e. by flushing out the cuttings into a container and weighing them) and using nuclear densitometers. In-situ cuttings concentrations that were obtained using these two different measuring methods are compared and discussed. The results show good agreement between densitometer readings and cuttings weight measurements. This study is useful for designing in-line monitoring systems that accurately measure the cuttings concentration in drilling applications.

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