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在应用相似理论的基础上,将流动单元与模拟实验相结合,对剩余油的形成过程和形成机理进行了微观物理模拟实验研究。结果表明:不同流动单元之间及同一流动单元内部驱替液总是沿优势渗流通道优先推进,水驱油过程主要存在稳定渗流和涌流2种形式;剩余油分布特征与流动单元类型有关,总体趋势为流动单元物性越好水淹程度越高,剩余油饱和度越低。微观模型水驱油实验发现研究区存在3种剩余油分布模式,但以绕流形成的剩余油为主,剩余油分布规模与储层非均质程度及驱替条件密切相关。
Based on the application of similarity theory, the flow cell and simulation experiment are combined to study the formation process and mechanism of residual oil by micro-physical simulation experiment. The results show that the displacement fluid between different flow units and within the same flow unit is always advanced along the predominant seepage channel. There are mainly two kinds of steady flow and inrush flow in the process of water flooding. The remaining oil distribution is related to the type of flow unit, The trend is that the better the physical properties of mobile units, the higher the degree of water flooding and the lower the residual oil saturation. Micro-model water-flooding experiments found that there are three kinds of remaining oil distribution pattern in the study area, but the remaining oil is mainly formed by flow around, and the remaining oil distribution is closely related to reservoir heterogeneity and displacement conditions.