夹层对底水油藏采收率影响定量研究

Quantitative research on inter-beds for oil recovery of bottom-water reservoirs

底水油藏中,夹层的分布位置、夹层大小、夹层厚度以及夹层的渗透能力均会影响底水锥进的快慢和油藏开发效果(采收率)的好坏。以海上某典型强底水油藏为例,运用数值模拟软件建立底水油藏单井机理模型,回归得到夹层各性质与采收率间的作用规律和函数表达式。采用正交优化以及多因素分析方法,建立采收率关于夹层性质的定量表征模型。通过对比得出,利用该表征模型计算的采收率大小与数值模拟软件模拟结果误差较小,可用于夹层影响下的底水油藏采收率大小的预测。

In the bottom-water reservoirs, the location, size, thickness and transmission capacity of the inter-beds have significant influences on the bottom water coning speed and the oilfield development effects（such as the oil recovery）. Based on a typical strong bottom water offshore reservoir, and by using the numerical simulation software to establish the bottom water single well model, the relationships between oil recovery and inter-beds, and the corresponding function formations have been obtained. A quantitative characterization model of oil recovery about the inter-beds has been established by methodology of orthogonal and more factor anal- ysis. By comparing the results, the difference between the oil recovery got by the numerical simulation software simulation and the model calculation is small, so that the model can be used to predict the oil recovery of bottom water with inter-beds.