Abstract
There are many factors that affect the distribution of remaining oil after polymer flooding, and different geological conditions, production methods and production systems will affect the distribution characteristics of remaining oil. In this paper, the control degree parameters of polymer flooding are used to quantitatively measure the remaining proportion of four types of microscopic residual oil after polymer flooding, namely cluster, membrane, blind end and corner, and it is concluded that different types of microscopic residual oil have different reduction ranges after polymer flooding. The microscopic remaining oil distribution law of different displacement intensity positions at high, medium and low levels is summarized. After polymer flooding, the remaining oil distribution is more concentrated, and the oil saturation in the remaining oil-rich area is higher, which is distributed in strips and sheets. The main enrichment areas of remaining oil are near faults and sandstone pinchouts. The residual oil for polymer drive has a limited effect, and the development difference in the subsequent water drive stage still exists.
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