دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a fluid in which the viscosity remains constant for all rates of shear if constant conditions of temperature and pressure are maintained. Most drilling fluids behave as non-Newtonian fluids, as their viscosity is not constant but varies with the rate of shear.

n: the basic and wsimplest fluids from the standpoint of viscosity consideration in which the shear force is directly proportional to the shear rate. These fluids will immediately begine to move when a pressure or force in excess of zero is applied. examples

a fluid whose shear force and response is directly proportional to shear rate. Yield point is zero.

n: the fluid that the relationship of shearing stress and shearing speed not adhere the netwon inner friction law.

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 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: the study of the flow of gases and liquids of special importance to mud engineers and reservoir engineers.

n: the science that deals with deformation and flow of fluids.

the study of the deformation and flow of matter. Real fluids include non-elastic solids, non-Newtonian fluids and viscoelastic substances. The added materials that provide viscosity range from clays to polymers to complex surfactant chemistry.

n: viscosity reduction of non- Newtonian fluids (e.g., polymers, most slurries and suspensions, and lube oils with viscosity-index improvers) under conditions of shear stress.

n: The effect that the viscosity of some non-Newtonian fluid will decrease at the shear pressure .



a fluid that when sheared, reduces viscosity.

n: The behavior that the viscosity of non-Newtonian fluid will decrease when velocity increase.