聚合物驱结合井网调整技术剩余油实验研究

过室内物理实验模拟研究聚合物驱结合井网调整技术的开发效果，从宏观和微观两方面分析了改变井网的聚合物驱油的开发效果及剩余油分布。宏观室内物理实验应用微电极技术，研究改变注采井网系统的聚合物驱调整技术的开发效果和剩余油分布。微观室内物理实验应用核磁共振技术，研究聚合物驱前后剩余油在高低渗岩心孔隙中的微观分布规律。结果表明，通过改变注采井网系统的聚合物驱调整技术，一方面可以有效的改善驱替前缘推进不均匀的情况，扩大波及体积；另一方面可以改善吸水剖面，在聚合物后续水驱阶段提高中低渗层大孔隙产量。同时，由于井网调整后减小了注采井距，可以在减少注入量的同时提高产油量。驱替结束后，剩余油主要分布在中低渗层未波及到的区域，以及低渗层中、小孔隙。

Experimental Study on Residual Oil of Polymer Flooding Composite Well Network Adjustment

The development effect of polymer flooding composite well network adjustment technology is studied through physics experiment simulation, and the development effect of oil displacement and the distribution of remaining oil are analyzed from macroscopic and microscopic aspects. The micro?electrode technology was applied to the macroscopic physics experiment to study the development effect and residual oil distribution of the polymer flooding composite well network adjustment technology. The microscopic physics experiment applied nuclear magnetic resonance technology to study the microscopic distribution of residual oil in the high and low permeability core pores before and after polymer flooding. The experimental results show that by changing the injection?production well network system during polymer flooding, on the one hand, it can effectively improve the unevenness of the displacement and expand the swept volume. On the other hand, it can improve the profile, increase the macropore production in the middle and low permeability layers during subsequent water flooding. At the same time, due to the reduction of the injection?production well spacing after the adjustment of the well pattern, it is possible to increase the oil production while reducing the injection amount. After the end of the displacement, the remaining oil is mainly distributed in the areas where the middle and low permeability layers are not affected, as well as the small pores in the low permeability layer.