聚驱后高浓度注聚开发指标变化规律研究

Research on Change Rule of the Development Index of High Concentration Polymer After Polymer Flooding

为研究聚合物驱后开发指标变化规律,通过流动实验测得了阻力系数、残余阻力系数,通过注入能力评价实验得到了合理注入速度。利用相对分子量为2 500万的高分子高浓度聚合物在用模拟的方式实现了各种井网类别的前提下,在仿真的特定物理模型之上开展了驱油的相关实验,其研究的数据结果清晰地表明了井网重构能在很大程度上降低普通聚驱剩余油饱和度,且井网重构后还能缓解注入压力的持续上升;随高浓聚合物驱阶段浓度增加,中低渗透层波及系数均有提高;井网重构后,使得原井网油井周围和其处在中间和低水平层次的渗透层中的剩余油获得了相应地使用,且这些剩余油处在分流线部位的,其驱油的效果得到了显著的提升。

In order to study change rule of the development index after polymer flooding, the coefficient of drag and residual resistance factor were measured by flow test, and the reasonable injection rate was obtained by the injectability evaluation experiment, Oil displacement experiment was carried out indifferent：types of wells in large scale simulation physical model of high molecular weight polymer with relative molecular weight of 25 000 000. The results show that the reconstruction of well pattern can greatly reduce the residual oil saturation and ease the continued rise of injection pressure; with the increase of polymer concentration, the conformance efficiency of middle and low permeability layer can be improved; after the reconstruction of well pattern, the remaining oil located near the diversion line and the original oil well can be utilized, displacement effect can be iinproved significantly.