02509nab a2200205 4500 20260520001810.0 260224s2010 xxu Effect of elasticity during viscoelastic polymer flooding A possible mechanism of increasing the sweep efficiency dic. 2010 20/12/2010 ; 20/12/2010 8 p. ; 49-56 Transcripción del resumen del autor. It has been long believed that the viscoelasticity of polymer solution improves the displacement efficiency in polymer flood operations, but the individual effect of elasticity has not been clearly distilled for a single viscoelastic polymer. In this study, the effect of elasticity of polymer-based fluids on the microscopic sweep efficiency is investigated by injecting two polymer solutions with similar shear viscosity, but significantly different elastic characteristics. Blends of various grades of polyethylene oxide (PEO) with similar average molecular weight and different molecular weight distribution (MWD) were prepared by dissolving in deionized water. The polymer solutions exhibited identical shear viscosity, but different elasticity. A series of experiments were performed by injecting the polymer solutions through a sandpack saturated with mineral oil. The experiments were performed using a special core holder designed to simulate radial flow. Injection was done through a perforated injection line located at the centre of the cell and fluids were produced through two production lines located at the periphery. The experiments were conducted within a shear rate range of field applications. Because both polymer solutions had similar shear viscosity behaviour, but different elastic properties, it was possible to see the effect of elasticity on the sweep efficiency alone. Results of the polymer flooding experiments indicated that the sweep efficiency of a polymeric fluid could be effectively improved by adjusting the MWD of the solution at constant shear viscosity and polymer concentration. The polymer solution with higher elasticity exhibited considerably higher resistance to flow through porous media than the one with lower elasticity, resulting in higher sweep efficiency and lower residual oil saturation. 12 Journal of Canadian Petroleum Technology 49 ARTICULO Urbissinova, T.S. 44034 Trivedi, J.J. 39592 Kuru, E. 11895 172375 172375 0 0 0 0 240194 BAAB BAAB 2026-03-05 200050352 0 200050352 2026-03-05 16:08:11 2026-03-05 ARTICULO