Análise Experimental da Recuperação de Fluidos em Meio Poroso Através da Injeção de Líquidos Newtonianos e Viscoelásticos

Abstract

The study of fluid flow in porous media is one of the greatest challenges of engineering, especially in the oil exploration area, where the recovery factor does not exceed 40% by primary and secondary recovery methods. In this work, we are interested in understanding, using a experimental methodology, the application of polymer-based solutions to recover newtonian solutions present in a porous media, aiming to understand the essential parameters related to the recovery factor. The oilbased solutions saturated in the porous media are called displaced fluid and the solutions that will be used to push the oil inside the porous media, which have viscoelastic or newtonian characteristics, are called displacer fluids. For the newtonian scenario, solutions with different concentrations of PEG, water, and alcohol were used as displacer fluids and it was shown that the lost mass fraction was lower when the viscosity ratio between the oil-based and water-based solutions was reduced. In this analysis, the capillary number was high enough so that the lost mass fraction was independent of this parameter. For the viscoelastic scenario, several solutions based on water, PEO and PEG were prepared, but only two viscoelastic solutions were used as displacing fluids. It is shown that the lost mass fraction reduced with increasing Deborah number when compared to the analogous newtonian scenario. Properties such as storage modulus, loss modulus and normal stress were obtained to aid in the analysis of non-newtonian scenario.