A hydraulically valid model with the resultant viscosity predicting algorithms has been developed for lost circulation material (LCM) added to non-aqueous drilling fluids.Measuring drilling fluid rheology for fluids containing LCM is difficult or impossible with a standard bob and sleeve rheometer because of the interference of the particles with the rotation of the sleeve in the narrow annular gap. A bob and sleeve with a larger annular gap invalidates the fundamental assumption of a constant shear rate across the gap. The ability to predict rheology after LCM addition could be...

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