YIELD-POWER LAW MODEL MORE ACCURATELY PREDICTS MUD RHEOLOGY

Terry Hemphill Baroid Drilling Fluids Inc. Houston Wellington Campos University of Tulsa Tulsa Ali Pilehvari Texas A & M University-Kingsville Kingsville, Tex. The yield-power law rheological model can calculate yield point much more accurately than that calculated by the Bingham plastic model. The yield-power law (Herschel-Bulkley) model offers many advantages over the Bingham plastic and power law models because it more accurately characterizes mud behavior across the entire shear rate range.

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