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采用不同分子量的聚合物和不同孔隙大小的岩心进行室内驱油模拟实验，研究了聚合物分子量对聚合物溶液粘度、 阻力系数和残余阻力系数、采收率以及机械降解的影响。研究了油层孔隙结构参数与分子量的相互关系对聚合物注入性 能的影响。结果表明，聚合物分子量愈大，阻力系数、残余阻力系数、采收率和机械降解愈大；但在大庆油田的实际条件下， 剩余粘度大。岩心孔隙半径中值与聚合物分子在水溶液中的均方回旋半径比大于５时不会发生油层堵塞。相近地质条件． 不同分子量，相同操作条件下的矿场聚合物驱结果表明：高分子量的聚合物驱效果好于低分子量的聚合物驱效果，采油井 产出的聚合物分子量大，保留粘度高。
Indoor polymer flooding experiments with different molecular weight polymers and cores with different pore sizes were carried out to study the effect of polymer molecular weight on viscosity, drag coefficient, residual drag coefficient, oil recovery and mechanical degradation of polymer solution. The influence of the relationship between pore structure parameters and molecular weight on the polymer injection properties was studied. The results showed that the larger the molecular weight of the polymer, the larger the drag coefficient, the residual drag coefficient, the recovery rate and the mechanical degradation were. However, the residual viscosity was large under the actual conditions in Daqing Oilfield. There is no blockage of the reservoir when the median radius of core porosity and the mean square gyration radius ratio of polymer molecules in aqueous solution are greater than 5. Similar geological conditions. The polymer flooding at different molecular weights and operating conditions shows that the polymer flooding with high molecular weight is better than the polymer flooding with low molecular weight. The polymer produced by the oil well has high molecular weight and high retention viscosity.