大港油田高含水油藏聚合物驱开发技术

Technology for development of high watercut oil reservoir by polymer flooding in Dagang Oilfield

针对港西二区在二次开发过程中,含水率上升速度快、油藏采收率较低的问题,对港西二区进行了整装区块的聚合物驱实验研究。通过对该区块进行适应性评价及数值模拟研究,确定了注聚井及注聚层位,制订了相应的注聚方案。经过注聚后的跟踪研究发现,聚合物驱改善了港西二区的开发效果,并根据开发效果,对注聚方案进行了重新优化,重新认识了黏度、段塞与驱油效率的关系,利用油藏数值模拟对聚合物驱开发效果进行了预测。港西二区注聚合物驱技术的成功实施为高含水油藏整装区块的聚合物驱开发提供了良好范例。

In view of the problems of fast increase in watercut and low recovery rate of oil reservoirs at the end phase of secondary development of No.2 Gangxi Region, experimental research has been conducted on polymer flooding for the whole block of No.2 Gangxi Region. Through adaptability evaluation on this block and research on numerical simulation, the polymer injection well and injection zones were determined, and the polymer injection scheme was formulated for No.2 Gangxi Region. Through followup after polymer injection, it was found that polymer flooding has improved the development effectiveness of No.2 Gangxi Region. Based on the development efficiency, the polymer injection scheme was re-optimized, and the relation between viscosity, slug and oil flooding efficiency was again recognized. The numerical polymer flooding model for oil reservoirs was used to predict the development effectiveness of polymer flooding. The No.2 Gangxi Region has provided a favorable example for the development of the whole block of high watercut oil reservoir by polymer flooding.