Application of different displacement media in Yan7 reservoir in Yan23 Area
In response to the current problems of low water flooding efficiency,single well production,and recovery in oil reservoirs in Yan23 Area,it is urgent to research water control and oil production stabilization technology to slow down the rate of water cut increase,explore new injection media,improve oil displacement efficiency,and enhance the ultimate recovery.Therefore,this article selected samples from the main oil layer of Yan7 reservoir to conduct indoor experiments with different displacement media and conducted on-site pilot testing based on the experimental results.The results show that the average oil displacement efficiency by pure water flooding is 45.45％,and the oil displacement efficiency in Yan71 is higher than that of Yan72.Based on nuclear magnetic resonance experiments,it is known that the pore throat radius and distribution pattern have a significant impact on the oil displacement efficiency.Compared to pure water flooding,the oil displacement efficiencies by nitrogen flooding,polymer flooding,and surfactant flooding after pure water flooding have all increased to a certain extent.Among them,the oil displacement efficiency by polymer flooding is the highest at 38.72％,followed by nitrogen flooding at 16.20％,and the lowest by surfactant flooding at only 4.39％.Moreover,the oil displacement efficiency in Yan72 reservoir is more than that of Yan71 reservoir.The polymer flooding pilot test conducted on-site showed an increase in formation pressure,increased oil production and decresed water cut,and a high response ratio,which is consistent with the results of oil displacement experiments.Overall,polymer flooding has a strong adaptability in the study area.The research conclusion has a guiding significance for efficient development in the study area at the later stage.
万方数据
维普
