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.

n: a colloidal clay, composed primarily of montmorillonite, that swells when wet. Because of its gel-forming properties, bentonite is a major component of waterbase drilling muds. See gel, mud.

a reference to colloidal clay (generally montmorillinite or smectite),generates plastic viscosity due to clay behavior, size and electrostatic layer. A slurry of which used for P&A Purposes will weigh no less than 9 ppg.

a rheological model used to describe flow in some fluids. Bingham fluids have a linear shear stress, shear-rate behavior after an initial shear-stress boundary has been crossed. Plastic viscosity or PV is the slope of the line. Yield Point is the threshol

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.

n: the flowing pressure of slurry when it cycles in the well,and the pressure is in connection with the density,plastic viscosity,shearing force and flow velocity of the slurry

n: an absolute flow property indicating the flow resistance of certain types of fluids. It is a measure of shearing stress.

n: a measure of internal resistance of fluid attributable to the amount,type and size of solids present in a given fluid. It is expressed as the number of dynes per sq cm of tangential shearing force in excess of the bingham yield value that will induce a un

an absolute flow property indicating the flow resistance of certain types of fluids. A measurement of shear stress.

plastic viscosity.

n: instrument used for assessing mud properties that records values for both plastic viscosity and yield point.

n: a drilling mud prepared by adding a surfactant to a water-base mud to change the colloidal state of the clay from that of complete dispersion to one of controlled flocculation. Such muds were originally designed for use in deep, hightemperature wells, but their many advantages (high chemical and thermal stability, minimum swelling effect on claybearing zones, lower plastic viscosity, and so on) extend their applicability.

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