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1. n. [Drilling Fluids]

A property of fluids and slurries that indicates their resistance to flow, defined as the ratio of shear stress to shear rate. Viscosity can be expressed mathematically as follows: Poise is the unit for viscosity, equivalent to dyne-sec/cm2. Because one poise represents a high viscosity, 1/100 poise, or one centipoise (cp), is used for mud measurements. One centipoise equals one millipascal-second. Viscosity must have a stated or an understood shear rate in order to be meaningful. Measurement temperature also must be stated or understood.

See: bentoniteBingham plastic modelbreakerBrookfield viscometercapillary tube viscometercarboxymethylcellulosecentipoisederrickmandirect-indicating viscometerfunnel viscositygel strengthgyp mudHerschel-Bulkley fluidhigh-pressure, high-temperature viscometerMarsh funnelmud additiveNewtonian fluidnon-Newtonian fluidpillplastic fluidpower-law fluidpseudoplasticPVTrheological propertyrheologyshear rateshear stressVG meteryield


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