Estudo reológico dos viscosificantes goma xantana e poliacrilamida aniônica
In order to prepare a drilling fluid, it is necessary to choose the composition, the treatment, and the parameters that need to be evaluated according to the fluid type and its additives. An important additive is the viscosifier, which is evaluated according to its rheological behavior. Nowadays, re...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/38763 |
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| Resumo: | In order to prepare a drilling fluid, it is necessary to choose the composition, the treatment, and the parameters that need to be evaluated according to the fluid type and its additives. An important additive is the viscosifier, which is evaluated according to its rheological behavior. Nowadays, research has been made in order to improve the efficiency of viscosifiers and drilling fluids. In this context, this paper describes the rheological study of biodegradable viscosifiers used as additives for water-based drilling fluids. Two polymers were used, Xanthan Gum and Anionic Polyacrylamide. The objective is to verify the viscosifier rheological behavior according to its changes in temperature (25, 40, 50, 60, 75 e 90ºC) and its concentration (0,05% to 0,86% polymer), checking the viscosity and flux changes as long as the parameters are changed. Results showed that the xanthan gum has the best thermal stability when compared to the polyacrylamide, and both polymers raised its viscosity linearly as the concentration raised until certain concentration (between 0,64-0,71% for xanthan gum and 0,57% for polyacrylamide), after this point, the viscosity tends to grow less, creating a curve of Herschel-Bulkley feature. From certain values of concentration the used material will not generate increase in viscosity, requiring in this way the use of another material. Also, if the polymer will be used in large ranges of temperature, the xanthan gum is the most indicated. |
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