Abstract
As polymer solution behaves as a shear-thinning viscoelastic fluid, its viscoelastic effects need to be considered in the analysis of polymer-flood performance. A new model including the viscoelastic effects was developed for predicting flow behaviors of polymer solution through porous media.In model formulation, total pressure drop is assumed to be the sum of viscous and elastic terms for the flow of polymer solution in porous media. Non-Newtonian viscosity of the solution is modeled as the Ellis fluid. The Kozeny-Carman model is used as a physical model of porous media. A new equation is proposed to predict the elastic pressure drop induced by polymer elasticity. This equation correlates the ratio of elastic pressure drop and viscous one with the Deborah number by introducing geometric parameters of porous media (C, mc). The Darcy's equation is modified to predict the viscoelastic flow behavior, where Darcy viscosity is expressed to be the sum of viscous viscosity and elastic one.Flow experiments of 200ppm polyacrylamide solution were done with glass-bead-packed cores. Calculated flow behaviors of polymer solution, based on the proposed model, were compared with the experimental data and found to be in good agreement.
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