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聚合物驱油时,聚合物分子量是影响其驱油能力的重要因素之一。实验考察聚合物在岩芯渗流过程中分子量变化规律,实验结果显示,聚合物在岩心渗流过程中,污水体系的分子量降解率低;相同粘度条件下,低分子量高浓度聚合物体系降解率低;相同浓度的条件下,分子量越低降解率越小;相同分子量条件下,浓度越高降解率越低;随着推进距离的增加,降解率逐渐减小。
Polymer flooding, the polymer molecular weight is one of the important factors that affect its oil displacement capability. The experimental results show that the molecular weight degradation rate of polymer wastewater is lower than that of polymer during core seepage process. The degradation rate of polymer with low molecular weight and high concentration is low under the same viscosity. Under the same concentration, the lower the molecular weight, the lower the degradation rate. Under the same molecular weight, the higher the concentration, the lower the degradation rate. With the increase of the propulsion distance, the degradation rate decreased gradually.