Abstract: The physical simulation experiment on polymer flooding was carried out with the longitudinal heterogeneous plane model by using the testing methods of polymer flooding front and sweep efficiency in laboratory.The dynamic flooding characters between internal heterogeneous model and interlayer heterogeneous model were contrasted.The results show that the sweep efficiencies of medium and low permeability formations reach 0.92 and 0.67 respectively in the interlayer model,but those of internal model reach 0.83 and 0.34 respectively.The internal model lags in the effectiveness of polymer flooding than the interlayer model after polymer flooding.The potential of remaining oil in the interlayer heterogeneous formation is great by increasing the sweep area of displacing phase.

Key words: Daqing Oilfield, heterogeneity, plane model, polymer flooding, sweep efficiency, experimental study

摘要： 利用室内建立的一套测定聚合物驱油水前缘和波及系数的方法,结合大庆油田的非均质特征,在纵向非均质大型平面模型上进行了聚合物驱油物理模拟实验,并对层间和层内两类非均质模型的动态驱替特征进行了对比分析。结果表明,聚合物驱后,层间模型的中、低渗透层波及系数分别能达到0.92和0.67,而层内模型中、低渗透层的波及系数仅为0.83和0.34,且相对层间模型受效较为滞后。这表明与层间非均质地层相比,在聚合物驱后,通过进一步提高驱替相的波及体积来挖潜层内非均质地层顶部剩余油的潜能更大。

关键词: 大庆油田, 非均质性, 平面模型, 聚合物驱, 波及系数, 实验研究