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RESUMO O objetivo deste trabalho e estudar a influencia do teor de solidos, velocidade e tempo de agitacao (fatores de entrada) nos parâmetros reologicos e de filtracao de fluidos de perfuracao a base de agua e argila, utilizando um planejamento fatorial do tipo 23 com tres experimentos no ponto central + configuracao estrela. Foram estudadas duas amostras de bentonitas sodicas industrializadas na Paraiba, caracterizadas por analise quimica, difracao de raio-X e microscopia eletronica de transmissao. Os fluidos foram preparados com concentracoes de 3,0% a 8,0% em massa, utilizando as velocidades de 10.000, 14.000 e 17.000 rpm e os tempos de agitacao de 7, 10, 15, 20 e 23 min. Atraves da regressao dos dados experimentais, verificou-se que dentre os fatores avaliados, o teor de solidos foi a variavel que apresentou maior influencia estatisticamente significativa sobre as propriedades reologicas dos fluidos. ABSTRACT The aim of this work is to study the influence of the concentration of solids, speed and agitation time on the rheology of water and clay based drilling fluids. Two sodium bentonite clays supplied by industry from Campina Grande, PB were studied. The physical and mineralogical characterization of the samples was done through chemical analysis, X-ray diffraction and transmission electron microscopy. A type 23 factorial design with three experiments in the central point + star configuration was developed to evaluate the effect of the some process variables (concentration of solids, speed and agitation time) over the apparent and plastic viscosity and fluid loss. The drilling fluids with concentrations from 3,0% to 8,0% w/w were prepared and mixed by using the speeds of 10,000, 14,000 and 17,000 rpm and agitations time period of 7, 10, 15, 20 and 23 min. The regression analyzis shows that the concentration of solids present correlation with significance with the rheological properties of the fluids.

ESTUDO REOLÓGICO DE FLUIDOS DE PERFURAÇÃO À BASE DE ÁGUA: INFLUÊNCIA DO TEOR DE SÓLIDOS, VELOCIDADE E TEMPO DE AGITAÇÃO