高孔高渗储层渗透率在长期冲刷条件下的变化规律

摘要

注水开发是我国大多数油田提高采收率的主要措施.渗透率是表示储层物性的重要标志,研究注水冲刷过程中储层渗透率的变化具有重要意义.以往的研究认为,高孔高渗储层的渗透率是增大的.然而从室内实验出发,通过长期的注水驱替、白油驱替、白油正向驱替和反向驱替相结合分析发现,高孔高渗的岩心在注水或注白油驱替后,渗透率也会降低.并论证了这一变化规律的影响因素.%Waterflooding is the main treatment to improve oil recovery used in most oilfields of our country. Permeability is an important index to represent reservoir physical property, therefore, the study of permeability change during the process of waterflood flush has great significance. Previous study shows that the permeabilities of the high-porosity and high-permeability reservoirs are increased. Based on the laboratory research on long-term water injection displacement, white oil displacement and the combination of forward and reverse white oil displacement, it is concluded that the permeability of the cores with high porosity and high permeability will decrease after the water injection displacement and white oil displacement. Moreover, the influencing factors that cause the permeability change are also discussed.