聚丙烯酰胺溶液在渗流过程中的流变性实验研究

Investigation of polyacrylamide solution rheology in seepage process

通过岩心渗流实验,研究了不同相对分子质量、不同质量浓度的聚丙烯酰胺(聚合物)溶液在多孔介质中的渗流特性;根据不同渗流速度下的渗流压力变化,计算了不同聚合物溶液在多孔介质渗流过程的有效粘度;分析了不同质量浓度和相对分子质量的聚合物溶液在多孔介质中的流变性变化。结果表明:在达西渗流速度范围内,聚合物溶液在渗流过程中岩心两端的压差随流量的增加表现出先上升后上翘的趋势;聚合物溶液在多孔介质中的有效粘度随剪切速率的增加先减小后增大;溶液的相对分子质量越大、质量浓度越大,有效粘度越大。

Though the flow experiment in core,the seepage characteristics of polyacrylamide（polymer） solutions with different molecular weight and mass concentration in porous media are studied;based on the pressure change under different seepage velocities,the effective viscosities of different polymer solutions in porous media are calculated;the change of rheological behaviour of polymer solutions with different molecular weight and mass concentration in porous media is analyzed.It is indicated the pressure difference that the polymer solution flows through the core increases first and then increases sharply with the increase in the Darcy velocity.With the increase of shear rate,the effective viscosity of polymer solution in porous media reduces first and then increases.The greater molecular weight and mass concentration of polymer solution,the greater effective viscosity.