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Bentonite clays may be used as additives in drilling fluids aiming at viscosity correction. A surface modification procedure with the purpose of dispersing the clay in the organic phase of a vegetable-oil-based drilling fluid was performed. The fluids were prepared using soybean oil, lauryl alcohol triethoxylate, brine, bentonite modified by hexadecyl trimethylammonium bromide (CTABr), and barite...