Nguyen et al. (2012) presented an interesting paper concerning the fundamental and hydraulic properties of three commercial bentonites and have provided some unusual interpretations. They are to be commended for obtaining a substantial amount of filter-cake data from a relatively simple commercial instrument – the American Petroleum Institute (API) fluid-loss apparatus. However, the present authors question whether the API fluid-loss apparatus has sufficient resolution to justify the detailed analyses and conclusions that the authors present. The present authors also have reservations about the original authors' viscosity test results and the use of the viscosity-time relationship for the interpretation of the...

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