![]() For unknown conditions, shoot for the middle at 50s-60s. How do you decide which viscosity to use based on ground conditions? For coarse or un-consolidated soils, the range is 50s to 90s. Your viscosity is in seconds: If it says 35 seconds, you have a 35s viscosity, and if you show 1 minute and 20 seconds, you have 80s viscosity. Remove your finger while starting the stopwatch, and let the fluid flow into the cup to the line closest to the top of the cup.Make sure to fill to the line just below the screen. ![]() While putting a finger on the outlet of the funnel, fill the funnel by pouring it over the screen.The easiest and fastest way to determine a fluid’s viscosity is with a Marsh cup and funnel: But, as a driller in the field, you need to break it down to a useable definition.įirst, how do we test for viscosity? Dipping your hand in the tank and counting the drops that fall off your fingers is not an option. At rest, both polymer and bentonite slurries display a viscous, gel-like structure, but flow almost like water when under stress/pressure.Īre you mesmerized yet? All these terms can be overwhelming, to say the least. In colloids (that is, bentonite) segregation of the particles/platelets in the flow causes a shear-thinning behavior. With polymer slurries, the alignment of polymer chains results in decreased viscosities. First, how do we test for viscosity? Dipping your hand in the tank and counting the drops that fall off your fingers is not an option.įluids are shear-thinning if the viscosity decreases as the shear rate or pump pressure/flow increases.
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