聚合物溶液在多孔介质中流动规律实验研究

摘要

由于孔隙介质的复杂性和聚合物溶液的黏弹性,导致聚合物溶液在多孔介质中流动与在流变仪中的流动相比更加复杂,同时聚合物溶液在多孔介质中的流动规律直接关系到驱油方案的制定.因此本研究设计并开展了聚合物溶液(部分水解聚丙烯酰胺)在岩心中流动参数测定实验,给出了岩心渗透率、聚合物溶液质量浓度、聚合物相对分子质量、聚合物溶液注入速度对阻力系数、岩心中流动黏度的影响规律.结果表明,聚合物溶液存在一个临界质量浓度,当溶液质量浓度低于临界质量浓度时,阻力系数与表观黏度基本相等;当溶液质量浓度高于临界质量浓度时,阻力系数远小于溶液表观黏度,且随着溶液质量浓度增加,两者之间差值增大.聚合物溶液在岩心中流动黏度远小于溶液在流变仪中表观黏度,且随着溶液质量浓度增加,溶液在岩心中流动黏度的增加幅度远小于溶液表观黏度的增加幅度.%Due to the complexity of porous media and viscoelasticity of polymer solution,the flow behavior of polymer solution in porous media is more complex than that in the rheometer,and the flow regular pattern of polymer solution in porous media directly affects the formulation of polymer flooding projects.In this paper,experiment on flow parameters measurement of polymer solution (partially hydrolyzed polyacrylamide)in porous media was designed,and the regular pattern of influence on resistance factor and flow viscosity in porous media caused by core permeability,polymer concentration,polymer molecular weight and polymer injection rate was given.The followings are the results:there exists a critical polymer concentration,when polymer concentration is lower than critical concentration,resistance factor is basically equal to apparent viscosity;when polymer concentration is higher than critical concentration,resistance factor is far less than apparent viscosity and the difference value is increased with the increase of polymer concentration.Flow viscosity of polymer solution in porous media is far less than apparent viscosity in the rheometer and when polymer concentration increases,the increase extent of flow viscosity is far less than the increase of apparent viscosity.