摘要
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。
Microscopic physical simulation experiment was made to study the forming process and mechanism of remaining oil based on the combination of flow unit, simulated experiment and similar theory.The result indicates:(1) time invariant seepage and time variant seepage are the main seepage forms,and displacement fluid flows more rapidly in big channels than in small channels among different and the same flow units;(2) the distribution features of the remaining oil are related to the type of the flow units,with the general trend of good type of the flow units,higher watered out degree,lower oil saturation of the remaining oil.The microscopic model experiment of displacement of oil by water shows that there are three distribution patterns of the remaining oil in the studied area.The main is formed by by-passing flow.The distribution scale of the remaining oil has close relation with reservoir heterogeneity and displacement conditions.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第3期90-91,共2页
Petroleum Geology and Recovery Efficiency
基金
国家"973"基础发展规划项目"大幅度提高采收率基础研究"(1999022508)
关键词
流动单元
物理模拟
剩余油
微观
flow unit
physical simulation
remaining oil
microscope
