大孔道识别方法及聚合物微球调驱在文中油田的应用

文中油田经过长期注水开发,一类储层内产生大孔道,注采低效循环问题突出.为提高驱油效率,开展了大孔道识别方法及聚合物微球调驱研究.根据储层物性参数变化规律和测井曲线的响应关系,建立了大孔道综合判别方法,进行聚合物微球调驱室内实验.现场应用证明,聚合物微球注入地层后,有效封堵了地层深部的窜流大孔道,实现了注入液体的微观改向,有效缩减了层间渗透率级差,启动了新层,实现了控水稳油,减缓了自然递减.

Application of large channel identifying method and polymer microsphere profile control and flooding in Wenzhong Oilfield

After long period of water flooding development,there is large channels in the injection-production process of Ⅰclass of reservoirs of Wenzhong Oilfield,and therefore the low efficiency cycling becomes a outstanding problem.Large channel identifying method and polymer microsphere profile control and flooding are studied for improving injection efficiency.The large channel identifying method based on the varying law of reservoir property parameters is established because there is a corresponding relationship the varying law and logging curves and the logging curves are closely related to the large channels.The laboratory study on polymer microsphere profile control and flooding are carried out.Field application shows that,the polymer microsphere can effectively plug the large channels in the reservoirs and reduce the difference in the permeability between layers,which realizes water-controlling and oil-stabilizing and reduces the natural decline of oil yield.The results have good application prospects to similar reservoirs in other oilfields.