聚驱后注液方式和井网结构对微球调驱效果影响研究——以大庆萨尔图油田为例

Effect of fluid injection mode and well pattern structure on profile control and oil displacement effect of microsphere solution after polymer flooding: taking Saertu Oilfield in Daqing as an example

以大庆萨尔图油田储层条件为研究对象,通过物理模拟驱油实验研究了聚驱后注入方式和井网结构调整对可动微球调驱效果的影响。结果表明,聚驱后实施进一步提高采收率措施时,通过提高注入速度来尽快达到较高注入压力水平可以取得较好增油降水效果。除此之外,聚驱后将原井网调整为直井+水平井井网,不仅可以改善水驱开发效果,而且可动微球调驱效果也可以得到充分发挥。与单独可动微球相比较,表面活性剂+可动微球二元体系具备了扩大波及体积和提高洗油效率的双重功效,采收率增幅较大。

The effects of fluid injection mode and well pattern structure on profile control and oil displacement effect of microsphere solution after polymer flooding are studied by simulation oil displacement experiments based on reservoir geological characteristics and fluid properties of Saertu Oilfield. The results show that,when further implementing EOR measures after polymer flooding,a good oil increasing and water-cut decreasing effect can be got by increasing injection rate to reach to higher injection pressure as soon as possible. Besides,after polymer flooding,original well pattern is changed to ' vertical well + horizontal well' pattern,which can not only improve the effect of water flooding,but also can give full play to the profile control and oil displacement effect of movable microsphere solution. Compared with movable microsphere flooding alone, ' surfactant + movable microsphere' binary system has the dual effect of expanding swept volume and improving oil displacement efficiency,and it can make oil recovery factor enhance more.