Journal
APPLIED CLAY SCIENCE
Volume 49, Issue 1-2, Pages 13-20Publisher
ELSEVIER
DOI: 10.1016/j.clay.2010.03.013
Keywords
Water-based drilling fluid; CMC; Design of mixture experiments; Bentonite
Funding
- CNPq (National Council for Science and Technology) [550653/2007-4]
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The influence of carboxymethyl cellulose, CMC, on the apparent and plastic viscosities of bentonite dispersions for water-based drilling fluids was investigated based on the statistical design. Ten formulations using bentonites, and high and low molar mass CMCs were used in the experiment design. Dispersions were prepared according to Petrobras company standards. Regression models were calculated, correlating the properties with the compositions. The significance and validity of the models were confirmed by statistical analysis and verification experiments. The regression models were used to analyze the influence of CMC content on the properties of bentonite-water dispersions. The statistical design can be applied to optimize mud properties considering CMC addition, and to gain a better understanding of the influence of polymer additives on the properties of bentonite-water systems. (C) 2010 Elsevier B.V. All rights reserved.
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