关键词: 聚合物驱, 粘度, 饱和度, 稳定流, 相对渗透率, 实验

Abstract: Relative permeability curves reflects the law of multiphase flow and distribution in reservior rock.According to experimental study on in-situ rheology of polymer solutions through porous media, an effective viscosity dependence of polymer solutoion upon phase saturation and fractional flow were obtained, in which the adverse influence of polymer adsorption/retention and non-Newtonian effects were eliminated.Therefore, a steady-state flow technique was established and modified for testing relative permeability curves of polymer flooding.At high reservoir temperature of 70℃, the relative permeability curves were successfully measured for both polymer/oil system and water/oil system after polymer slug by using the steady-state flow method.Suitable empirical equations were adopted for both curves.Then, the relative permeability behavior for polymer flooding was discussed and, effects of polymer molecules retained in rocks and free in aqueous phase were also analysed, thus revealing the law of multiphase flow and oil displacement mechanisms during polymer flooding.Consequently, the basic and important parameters were provided for numerical simulation, pcrformance prediction and effectiveness evaluation of polymer flooding.

Key words: polymer flooding, viscosity, saturation, steady-state flow, relative permeability, experiment