دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the viscosity of a drilling fluid as measured with a directindicating, or rotational, viscometer.

n: The viscosity a fluid appears to have on a given instrument at a stated rate of shear. It is a function of the plastic viscosity and the yield point. The apparent viscosity in centipoises, as determined by the direct-indicating viscometer, is equal to the

the viscosity at a given shear rate and a given temperature.

apparent viscosity.

n: a dilatant. or inverted plastic, fluid is usually made up of a high concentration of well-dispersed solids that exhibits a nonlinear consistency curve passing through the origin. The apparent viscosity increases instantaneously with increasing rate of shear. The yield point, as determined by conventional calculations from the direct-indicating viscometer readings, is negative;however, the true yield point is zero.

n: This fluid is one of non-Newtonian flow patterns whose unique feature
is that once the fluid is subjected to force,it will start flowing without any gel strength.




a well dispersed, high solids content liquid that has very high apparent viscosity with any applied shear.

n: commonly called a V-G meter: A rotational device powered by means of an electric motor or handcrank. Used to determine the apparent viscosity, plastic viscosity, yield point, and gel strengths of drilling fluids.

adj: having the capability of changing apparent viscosity with a change in shear rate. Pseudoplastic fluids gain viscosity when subjected to a decrease in shear rate, and lose viscosity when the shear rate is increased. See shear

n: a kinds of non-Newtonian fluid, its character is that it flows when enforced by slim shear stress.



a complex non-Newtonian fluid without thixotrophy. Flow starts with pressure but apparent viscosity decreases instantaneously with increasing rate of shear.

n: a device used to determine the viscosity of a substance. Also called a viscosimeter.

n: Commonly called a V-G meter.The instrument is a rotational-type device powered by means of an electric motor or handcrank and is used to determine the apparent viscosity,plastic viscosity,yield point and gel strengths of drilling fluids.The usual speed

n: see viscometer.

n: Commonly called a V-G meter.The instrument is a rotational-type device powered by means of an electric motor or handcrank and is used to determine the apparent viscosity,plastic viscosity,yield point and gel strengths of drilling fluids.The usual speed

n: a biopolymer produced from a particular strain of bacteria on carbohydrates that produces large increases in apparent viscosity while maintaining fairly good control of filtration.