Influência de dispersão coloidal de SiO2 nos parâmetros reológicos de pastas de cimento para poços petrolíferos

• Autor(a) principal: Eufrázio, Luanna Cristina Cavalcanti
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38351
• topic: Cimento; Portland; Aditivos; Estedendor; Sílica; Química

Oil Well cementing jobs, the cement slurries shall present suitable rheology to be pumped to achieve great depths. Before being used on field operations the cement slurries undergo to a rigorous sequence of tests in the laboratory which simulates the real conditions of petroleum wells especially high pressure and high temperature, taking into account the operation time, the flux regime during the paste displacement, and the operation and environment safeties. In cement operations, the commonplace cement used is the Portland cement class G. There are several mineral materials, which could be used in partially substitution or in addition to Portland cement. Studies have shown that colloidal dispersion is able to increase the cement slurry’s yield; therefore it allows an extra addition of water which means a cement slurry density decreasing. The aim of this study is evaluate the rheology properties of cement slurries containing a colloidal dispersion with 30% of particles at the nanometer scale. According to the results, the colloidal dispersion addition increased the rheology’s parameter and decreased the free water available in the cement system. This change is related to the filler effect and the substitution of the cement particle (3,1 g/cm3) by the nanoparticles (2,2 g/cm3).