In order to study the law of remaining oil re-enrichment during the high water-cut stage of complex fault-block reservoirs and evaluate the quality of remaining oil after re-enrichment,physical simulation experiments of remaining oil re-enrichment were conducted on thick-layer reservoirs and narrow-strip reservoirs in Jiangsu Oilfield,to analyze the influences of factors such as interlayer,distance between wells and faults,and pressure gradient on the remaining oil re-enrichment law.Based on the results of physical simulation experiments,a method for evaluating the quality of remaining oil re-enrichment was established by the re-enrichment index and utilization potential index as evaluation indicators.The evaluation results indicate that for thick oil reservoirs and narrow strip reservoirs,the remaining oil re-enrichment index and utilization potential index are higher under high-pressure gradient conditions,the decrease in water content and the increase in oil recovery are larger,and the quality of remaining oil re-enrichment is better.For narrow strip reservoirs,when the remaining oil is re-enriched far away from the fault,the decrease in water cut and increase in oil recovery is higher than that of the near-fault.
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