Plastic Viscosity is derived from the 600 rpm reading minus the 300 rpm reading and PV is in centipoises (cp). Viscometer is equipment to measure Plastic Viscosity (See Figure 2). PV is the slope of the shear stress-shear rate plot above the yield point (See Figure 4). The funnel viscosity is useful only for relative comparisons.Ģ) Plastic Viscosity (PV): A parameter of the Bingham plastic rheological model (See Figure 3). This is not a true viscosity, but serves as a qualitative measure of how thick the mud sample is. A quart of water exits the funnel in 26 seconds. There are 2 types of viscosity which are Funnel Viscosity and Plastic Viscosity.ġ) Funnel Viscosity: It is time, in seconds for one quart of mud to flow through a Marsh funnel which has a capacity of 946 cm3 (See Figure 1). Viscosity: It is defined as the internal resistance of fluid flow. Mud density is used for providing hydrostatic pressure to control well for drilling operation. Drilling fluid properties are essential information that everybody should understand.ĭensity: Mud density is the weight per unit volume of mud and normally it is reported in Pound Per Gallon (PPG).
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