دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: in drilling-fluid terminology, a chemical is any material that produces changes in the viscosity, yield point, gel strength, fluid loss, and surface tension.

n: In drilling-fluid terminology, a chemical is any material that produces changes in the low-shear-rate viscosity, yield point, gel strength, fluid loss, pH, or surface tension.

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.

n: a suspension of extremely fine particles in a liquid (such as colloids in a colloidal solution).

n: Subdivision of aggregates. Dispersion increases the specific surface of the particle, which results in an increase in viscosity and gel strength.

a mixture of a internal phase of solids, droplets or bubbles that stay relatively suspended in a continuous fluid.

n: trade name of a device used to record and measure at different speeds the flow properties of plastic fluids (such as the viscosity and gel strength of drilling fluids).

n: a condition wherein the 10-minute gel strength is substantially equal to the initial gel strength.

n: a measure of the ability of a colloidal dispersion to develop and retain a gel form, based on its resistance to shear. The gel. or shear, strength of a drilling mud determines its ability to hold solids in suspension. Sometimes bentonite and other colloidal clays are added to drilling fluid to increase its gel strength.

n: a parameter used to measure the shear strength of the mud and its ability to hold solids suspension.bentonite and other colloidal clays are added to the mud to increase gel strength.

the ability of a fluid to suspend solids.

the shear stress measured at low shear rate after the mud has set for a period of time.

n: the measured initial gel strength of a fluid is the maximum reading taken from a direct-reading viscometer after the fluid has been quiescent for 10 sec. it is reported in 1b/100 ft2

n: the measured 10-min gel strength of fluid is the maximum reading taken from a direction-reading viscometer after the fluid has been quiescent for 10 min. the reading is reported in 1b/100 ft2.