摘要
密闭取心技术是剩余油研究的主要手段，通过开展多种岩心实验，可以准确分析高含水油藏水驱、多元驱后微观孔隙结构的变化以及剩余油的微观赋存状态等。文中依据微观玻璃刻蚀驱替实验，将剩余油赋存状态分为簇状、多孔状、块状、柱状、滴状和膜状等6种类型。实验表明：水驱随实验时间变化，孔径明显增大，孔喉连通性变好，岩石孔隙度变大，岩心物性总体变好；而二元驱后，孔径的时移特征与水驱相反，孔径显著减小，孔隙空间被聚合物替代。随着驱替的时间变化，微观剩余油赋存量减小，小油滴增多，大油滴减少；驱替前，微观剩余油以连续型的簇状、多孔状及分散型的较大块状、柱状为主；驱替后，微观剩余油以分散型的滴状、膜状及较小的块状、柱状为主。
Abstract
The sealed coring technique is the main method of residual oil research. Through the implementation of multiple core experiments, the change of microscopic pore structure and the microscopic occurrence state of residual oil after water flooding and multi-component flooding can be analyzed accurately. In this paper, according to the micro-glass etching experiment, the residual oil occurrence state is divided into six types: cluster shape, pore shape, block shape, column shape, droplet shape and membrane shape. The experiment shows that the water flooding changes with the experiment time, for example, the pore size significantly expands, the pore-throat connectivity becomes better, the rock porosity becomes larger, and the core physical properties generally improve. However, after the binary flooding, the time shift characteristics of the pore size is opposite to that of water flooding, the pore size is significantly reduced, and the pore space is replaced by the polymer. With the time change of displacement, the amount of microscopic residual oil decreases, small oil droplets increase, and large oil droplets decrease. Before the displacement, the microscopic residual oil consist of continuous types such as cluster shape and pore shape, and dispersed types such as bigger block shape and column shape. After the displacement, the microscopic residual oil is mainly dispersed types, such as droplet shape, membrane shape, smaller block shape and column shape.
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