Research on the distribution pattern of residual oil during high water cut periods in complex fault block reservoirs
For complex fault block reservoirs in the later stage of water injection development,it is difficult to characterize the distribution pattern of remaining oil.Finding the sweet spot area of remaining oil becomes the key to improving water flooding recovery.This article takes Block H as an example,analyzes the water flooding characteristics of different rhythmic reservoirs,and conducts research on the distribution characteristics of remaining oil.The remaining oil is mainly distributed between production wells,near faults,and at the top of thick oil layers with small differences in normal rhythm and permeability,And develop reasonable potential tapping strategies for different types of remaining oil,including implementing infill wells,old well side drilling,and horizontal wells deployed at the top of thick layers.Deploy and implement 23 types of wells on site,increasing daily water injection by 440 cubic meters,the highest daily oil production by 170 tons,increasing oil recovery rate by 0.28%,and accumulating 57000 tons of oil in each stage.It is expected to increase water flooding recovery rate by 5%and achieve effective utilization of water flooding controlled reserves.
High water cut stageRemaining oildistribution characteristicsPotential tapping strategies
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