دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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: see plastic fluid.

n: the fluid is ram type in the tube or the center speed above the speed of margin.

n: a complex, non-Newtonian fluid in which the shear force is not proportional to the shear rate. Most drilling muds are plastic fluids.

n: a complex, non-newtonian fluid in which the shear force is not proportional to the shear rate. A definite pressure is required to start and maintain movement of liquid. Plug flow is the initial type of flow and only occurs in plastic fluids. Most drilling

a complex, non-Newtonian fluid whose shear force is not proportional to the shear rate. Pressure is necessary to start circulation of the static fluid. Main low rate flow is plug flow. Yield point is greater than zero.

n: a fluid moving as a unit in which all shear stress occurs at the pipe wall and hole wall. The stream thus assumes the shape of several telescopic layers of fluid with lowest velocities near the pipe and hole walls and the fastest in the middle.

n: the movement of a meterial as a unit without shearing within the mass. Plug flow is the first type of flow exhibited by a plastic fluid after overcoming the initial force required to produce flow.

fluid moves as a unit.

n: also called index number law, the mathmatic expression describes rheological curve of pseudoplastic fluid.

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.