用荧光分析方法研究聚合物驱后微观剩余油变化

聚合物驱后微观剩余油分布由驱油的动力和阻力两大因素决定,在这些力的共同作用下,水驱后不同类型的微观剩余油在聚合物驱后的微观分布不同。研究了聚合物驱提高驱油效率的机理,利用荧光分析方法,对比了天然岩心水驱和聚合物驱后的荧光分析图片,统计出了聚合物驱后不同类型微观剩余油的比例,给出了高、中、低不同强度水淹部位的微观剩余油分布规律。

Fluorescence analysis on changeable rules of microscopic remaining oil after polymer flooding

The main factors for determining the distribution of microscopic remaining oil after polymer flooding include dynamic force and resistance for oil displacement. Under the coactions of these forces, the distribution of different kinds of microscopic remaining oil existing after water flooding stage is different from that after polymer flooding. In order to study the change and distribution rules of microscopic remaining oil, the mechanism of polymer flooding to enhance displacement efficient was studied. The result shows that polymer flooding can enhance displacement efficient and swept volume. The fluorescence analysis method was used to contrast the fluorescence analysis pictures of natural cores after water drive and polymer flooding. The statistical remaining ratio of the different kinds of microscopic remaining oil after polymer flooding were obtained, and the microscopic remaining oil distribution patterns of flooded-out parts in high, medium and low intensity were presented.