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1. adj. [Drilling Fluids]

A descriptive term for a fluid with shear-thinning characteristics that does not exhibit thixotropy. Most effective drilling fluids are shear thinning, although most also exhibit some gel-building characteristics. Pseudoplastic rheology, low viscosity at high shear rates and high viscosity at low shear rates, benefits several aspects of drilling-higher drilling rate and improved cuttings lifting. Bingham plastic fluids, power-law fluids and Herschel-Bulkley fluids fall in the psuedoplastic category of rheology.

See: Bingham plastic modelHerschel-Bulkley fluidhydroxyethylcellulosenon-Newtonian fluidplastic fluidpower-law fluidshear rateshear stressthixotropyviscosityXC polymer

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