TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA simple and robust indentation test has been found to be useful in evaluating shale additive performance, providing results that correlate strongly with those of the much more time-intensive high pressure hollow cylinder tests. This method has been used to evaluate shale inhibitors and many other common drilling fluids additives. Experiments have been carried out with carefully prepared samples of Pierre 2 Shale aged in different formulations. A ranking of shale strength versus mud formulation has been constructed for the following water based fluid additives: glycols (soluble and with Cloud Point), salts (organic and inorganic), gypsum, and polymers (Xanthan Gum, cationic, polyanionic cellulose). Based on the X-ray diffraction pattern analysis of aged shale samples a shape factor has been proposed to identify effective additives.
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