聚合物驱后剩余油分布核磁成像实验研究

Laboratory Evaluation of Remaining Oil Distribution by NMR Technology after Polymer Flooding

聚合物驱后剩余油分布特征是选择进一步提高采收率技术措施的重要依据。通过利用核磁成像技术,在二维纵向层内非均质物理模型和五点法并网仿真平面非均质物理模型上对聚合物驱后剩余油分布特征进行了实验研究。实验结果表明,核磁成像实验方法所得模型剩余油分布特征与常规实验方法所得结果基本一致。由核磁成像实验方法确定的聚合物驱后剩余油分布特征是,对于二维纵向层内非均质物理模型,剩余油主要分布在中、低渗透层;对于五点法并网仿真平面非均质物理模型,剩余油主要分布在远离注入井的边、角区域。

It is very important for petroleum engineers to know where remaining oil distributes after polymer flooding when EOR method is selected. In this paper, laboratory evaluations on remaining oil distribution after polymer flooding had been done in two kinds of physical models by using NMR technology. Experimental results show that the distribution characteristics of remaining oil obtained by NMR method are generally consistency with those obtained by traditional physical simulation, and the remaining oil after polymer flooding distributes mainly in lower permeable layer for rhythmical reservoir or in area far from injector for inside homogeneous reservoir.