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Rheological Characterization of Bentonite Dispersions with Xanthan for Oil Well Drilling Fluids

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Table 3. Factorial design variables and levels, where (-1) is the  lower level; (0), the midpoint; and (+1), the upper one.
Figure 1. Pareto charts for flow consistency (a) and flow behavior (b) indexes with a confidence level of 95%.
Table 6. ANOVA analysis of flow index (n).
Table 7. ANOVA analysis of flow consistency index (k).
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