剪切聚合物对阻力因数和残余阻力因数的影响

Effect of shearing polymer on resistance factors and residual resistance factors

用剪切后相对分子质量分别是600×104、800×104和1200×104的聚合物溶液以及根据其黏度在室内配制的相同黏度相同相对分子质量的聚合物溶液,在不同渗透率的人造岩心上进行阻力因数和残余阻力因数的测定.实验结果表明:相同渗透率岩心,未经剪切的聚合物溶液的阻力因数和残余阻力因数高于经剪切之后的相同相对分子质量的聚合物溶液的阻力因数和残余阻力因数;相同相对分子质量的聚合物溶液,岩心渗透率越高,其流动时的阻力因数和残余阻力因数越小;相同渗透率岩心,聚合物溶液相对分子质量越大,其阻力因数和残余阻力因数越大.

In the paper, one kind of polymer solution whose molecular weights are respectively six million, eight million and twelve million after shearing is provided by Daqing petroleum engineering research institute, another is the polymer solution with the same viscosity and molecular weight as the first polymer solution that is made up in the lab according to its viscosity, we use them to proceed with the measuring of resistance factor and residual resistance factor in the artificial cores. The experimental results indicate that if the permeability of the cores are the same, resistance factors and residual resistance factors of the polymer solution without being sheared are higher than that of the polymer solution sheared for the same molecular weight. If molecular weights of the polymer solution are same, the higher permeability is, the smaller resistance factors and residual resistance factors are. If permeability of the cores are same, the larger molecular weights of the polymer solution are, the larger their resistance factors and residual resistance factors are.