FERREIRA, H. S.; http://lattes.cnpq.br/4481989037518681; FERREIRA, Heber Sivini. (BrasilCentro de Ciências e Tecnologia - CCTPÓS-GRADUAÇÃO EM CIÊNCIA E ENGENHARIA DE MATERIAISUFCGUniversidade Federal de Campina Grande, 2005-11-16)
In drilling sensible to water it can to use oil based fluids. In these cases, the bentonite clay cannot be used without a previous organic treatment, which makes their surfaces as hydrophobic. After treated, these clays ...