Rheologic and hydraulic parameter integration improves drilling operations

Roberto Maglione, Alberto Guarneri, Giovanni Ferrari ENI/Agip Division Milan The correct selection of drilling fluids should be based on the entire mud circuit, encompassing and integrating both rheological and hydraulic criteria during the design phase, instead of delegating a passive role to drilling fluid properties while placing greater emphasis on mud pump parameters. Other important constraints, such as borehole wall erosion, drillstring pressure drop, high viscosity values at the wall of the borehole, and low viscosity values at the bit, are not taken into consideration in the mud planning phase, resulting in the inefficient optimization of the above-mention...

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