Study on oil displacement efficiency of high recovery and high water cut oilfield based on dynamic inversion and its potential tapping practice
The remaining oil presents the distribution characteristics of overall dispersion and local enrichment in the strongly waterflooded oilfield at the high recovery and high water cut development stage.The accurate evaluation of the remaining oil potential is of great significance to the adjustment and tapping of remaining oil at this stage.Based on the actual production data of the field and the indoor experimental understanding of the ultimate oil displacement efficiency,a dynamic inversion mathematical model for the ultimate oil displacement efficiency at the mine level was constructed by comprehensively considering factors such as typical well pattern,waterflooded thickness,recovery,and water cut in the field.The ultimate oil displacement efficiency of the typical well pattern is quantitatively calculated.The research results indicate that:1)The oil displacement efficiency varies with the oil viscosity.The oil displacement efficiency can reach 68％when the oil viscosity is 50 mPa·s,and the oil displacement efficiency can reach 62％when the viscosity of crude oil is 300 mPa·s;2)The variation laws of oil displacement efficiency vary significantly depending on different well patterns.Based on the actual development of SZ oilfield,the ultimate oil displacement efficiency of directional well pattern can reach 48％,and the oil displacement efficiency of well pattern of horizontal well directional well combination can reach 61％～68％.The oil displacement efficiency could be significantly increased in SZ oilfield based on the evaluation method of remaining oil potential in this paper.In the future,the oil displacement efficiency can be further improved by adjusting the well pattern.This research achievement considers the impact of viscosity differences and quantitatively evaluates the impact of well pattern adjustment on improving oil displacement efficiency in high water cut oilfields.It provides guidance for the potential evaluation of SZ oilfield and also provides a reference for other oilfields in the same development stage.
high recovery and high water cut development stagedynamic inversionoil displacement efficiencyadjustment and tapping potentialBohai Oilfield
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