F PR is the ratio of the time needed for a CDG and a polymer solution of equal polymer concentration to flow out through a sand pack and expresses the relative strength of the CDG in porous media.

• 孔隙阻力因子FPR为相同聚合物浓度的CDG和HPAM溶液分别流过填砂滤层所需的时间之比 ,可代表CDG在多孔介质中的相对强度。