摘要
聚驱相对渗透率曲线是聚驱油田进行开发指标预测的重要基础。针对海上L油田因缺乏聚驱相对渗透率实测资料导致的数值模拟精度不高的现状,采用非稳态法测定了聚驱相对渗透率曲线,对比不同岩心渗透率和聚合物浓度下相对渗透率曲线的形态特征,总结聚驱相对渗透率曲线的变化规律。实验结果表明,聚驱相渗曲线随着岩心渗透率升高,相同含水饱和度时的油相相对渗透率降低,残余油饱和度降低;随着聚合物浓度升高,相同含水饱和度时的油相相对渗透率升高,残余油饱和度降低;聚驱冲刷前期,残余油饱和度迅速下降,中后期残余油饱和度下降速度明显变缓。研究成果可为海上聚合物驱油田精细油藏数值模拟、开发方案编制提供指导和依据。
The relative permeability curves of polymer flooding are important bases for the development index predicting the polymer flooding oilfield.Aiming at the low numerical simulation accuracy caused by the lack of the relative permeability of the polymer flooding in the offshore L oilfield,we determined the relative permeability curves of the polymer flooding by the non-steadystate method to compare the relative permeability of different core permeability and polymer concentration.The variation law of relative permeability curve of the polymer flooding was summarized as well.The experimental results showed that the permeability curves of the polymer flooding increased with the core permeability,the relative permeability of the oil phase decreased with the same water saturation,and the residual oil saturation also decreased.With the increase of the polymer concentration,the oil relative permeability of the same water saturation increased,but the residual oil saturation decreased.In the early stage of polymer flooding,the residual oil saturation decreased rapidly,while in the middle and late stages,the residual oil saturation decreased slowly.The research results provided guidance and basis for fine numerical simulation and development planning in offshore polymer flooding fields.
引文
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