By P. Skalle
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Additional resources for Drilling Fluid Engineering [Exercises]
12 m/s. 6 s-1 We assumed Newtonian fluid just to obtain a quick estimate. 8 Pa. 1 Pa Power law is the best model at this specific application. 3 Bingham / Power law a) From the flow curve (τ vs. γ) it is obviously closest to the Power low model, especially for low shear rates. The Bingham model reads about 12 Pa higher than the measured data. 2 Pa. We see that even the Power law is far off here, around 9 Pa too low. b) This is a time effect while performing rheological readings in the lab. Starting at 600 rpm and reducing the speed gradually to 6 and 3 rpm low shear rate (laminar of course) and spending time performing the test that colloidal clay particles are given the environment to flocculate (edge to face).
Therefore it is, as stated in text book, recommended to apply the three data points closest to the actual shear rate. Please repeat the solving procedure for the lower 3 data points and compare results.
In this figure only flow rate is correctly scaled, Rp-values are only quantitative. 020 34 Exercises within Drilling Fluid Engineering Hydraulic program a) Area I is defined as the pump operating range of the smallest liner. Derive optimal flow rate, qopt II, in pump area II by maximizing ROP: ROP = K q dn a8 b) Determine at which depth Range II stop (downwards) and at what depth Range I start. q and thus not a quantitative correct drawing) d) What pump area is optimum at 2000 m. 7.
Drilling Fluid Engineering [Exercises] by P. Skalle