Navegando por Autor "Soares, R. A."
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Artigo Cement slurries of oil wells under high temperature and pressure: the effects of the use of ceramic waste and silica flour(ABPG, 2012-10-04) Souza, P. P.; Soares, R. A.; Anjos, Marcos Alyssandro Soares dos; Freitas, J. O.; Martinelli, Antonio Eduardo; Melo, D. F.This study evaluates the behavior of a ceramic waste material in partial and total substitution of a mineral additive, commonly used in oil well cement slurries, when exposed to high temperatures and pressures. The samples were submitted to a cycle of low temperature (38°C) for 28 days, followed by exposure to 280oC and 6.5MPa (1000 psi) for 3 days. The evaluation was made by compression testing and X-ray diffraction (XRD). The results showed that cement pastes containing ceramic waste, when combined with silica flour, produced hydrated products of low Ca/Si ratios which maintained the compressive strength at satisfactory levels