聚合物溶液在多孔介质中的渗流规律及其提高驱油效率的机理

通过室内实验，测定了聚丙烯酰胺（HPAM）溶液在流变仪中的流变性，通过多孔介质的流变性和残余阻力系数，并用不同的浓度，注入速度和岩心渗透率进行了驱油实验，结果表明，随着浓度的增加，聚合物溶液的体相粘度、表观粘度和残余阻力系数增加，衰竭层厚度减小，驱油效率增加，注入速度增加时，聚合物溶液的衰竭层厚度降低，粘弹性增加，驱油效率增加，渗透率的增加能使驱油效率增加，对提高驱油效率起作用的是聚合物分子的缠结作用引起的表观粘度的增加或衰竭层厚度的降低，这种作用能使平行于油水界面的拉动残余油的力增加。

Flow laws of Polymer Solution in Porous Media and Their Mechanism on Enhanc-ing Displacement Efficiency

The rheological behaviors of HPAM solution in a rheometer and in porous media and residual resistance factors are measured through experiments. Displacement experiments are proceeded with various concentration, injecting speed and core permeabilities. The results show that with the concentration increase of HPAM solution, the bulk viscosities, the apparent viscosities and the residual resistance factors increase, depleted layer thickness decreases and the displacement efficiency increases. The depleted layer thickness of HPAM solution decreases, viscoelasticities and displacement efficiency increase with injecting speed increase. The increase of permeabilities can increase displacement efficiency. What can increase displacement efficiency of polymer flooding is the increase of the force to pull residual oil which is parallel to oil water interface generated by the increase of apparent viscosity or the decrease of depleted layer thickness, which are the results of the overlap of polymer molecules.