B区块主力油层聚驱后变流线井网调整研究

Research of Well Pattern Adjustment by Streamline Variation on Main Productive Layers in Post-Polymer Flooding Block B

B区块主力油层经过水驱和聚合物驱开发以后,仍有一定程度的剩余油未采出,需要进一步挖潜。通过数值模拟、密闭取心井资料及水淹层测井解释资料分析,对区块聚合物驱后剩余油分布状况及特征进行了研究,发现剩余油在平面上主要聚集在分流线附近,其含油饱和度高于主流线2.35%;纵向上主要分布在葡Ⅰ2和葡Ⅰ3单元。为此,开展了变流线提高采收率机理研究,分析了不同变流线方式对提高采收率的影响,认为分流线加密为最佳调整方式。在此基础上,根据B区块地质特征和井网现状,设计了3个井网调整方案。经过对比分析,优选加密调整转变流线方案。数值模拟预测表明,调整可提高采收率1.26%,结合高浓度聚驱可提高5.17%。

There is the further potential tapping for the main productive layers in block B,and this is owing to a certain amount of untapped remaining oil after water flooding and polymer flooding.The research focus on the remaining oil distribution and characteristics of post-polymer flooding,by means of numerical simulation and the data analysis of sealing coring wells and log interpretation of water flooded layers,which shows the remaining oil horizontally concentrates in fluid diversion line with 2.35 percent higher than main streamline oil saturation and is vertically distributed in layer PⅠ2 and PⅠ3.Therefore,the research of streamline variation to enhance oil recovery has been performed to analyze the influence from different ones on EOR,which indicates that the well pattern infilling in fluid diversion line is optimum.According to the geological characteristics and current well patterns,three kinds of well adjustment patterns have been designed on basis of previous research.The streamline variation by well pattern infilling has been adopted through contrastive analysis which can enhance EOR by predict 1.26 percent by water flooding and 5.17 percent more with high concentration polymer flooding.