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本文仅就低渗透油层采收率与渗透率的关系及采收率与驱替速度的关系进行了岩心实验研究,结果表明,对于低渗透油层,其采收率值与地层渗透率存在明显依赖关系。随着渗透率的降低,采收率明显降低。驱替速度对采收率也有明显的影响。驱替速度逐渐增大导致采收率先是显著增加,达到最大位后又趋减小,并存在使采收率最大的一最佳驱油速度。实验说明,低渗透油层中多相渗流具有某些特殊规律,它与低渗透率及地层孔隙结构特征有密切关系,对它们的研究具有重要的理论和实际意义。
In this paper, the core experimental study on the relationship between oil recovery and permeability of low permeability oil reservoir and the relationship between oil recovery rate and displacement rate shows that there is a clear dependence on the oil recovery rate and formation permeability for low permeability oil reservoir relationship. With the decrease of permeability, oil recovery is obviously reduced. Displacement rate also has a significant impact on recovery. As the displacement rate increases, the oil recovery increases first and then reaches the maximum, and then decreases, and there is an optimum displacement rate that maximizes oil recovery. The experimental results show that the multiphase flow in low permeability reservoirs has some special laws, which are closely related to the low permeability and the characteristics of pore structure. The research on them is of important theoretical and practical significance.