孤岛油田中一区聚合物驱后油层的波及状况

Sweep conditions of oil reservoirs after polymer flooding.

聚合物驱提高原油采收率的主要机理是扩大波及系数,聚合物驱后油层波及状况的研究是聚合物驱效果评价和进一步提高采收率的基础。文章结合油藏数值模拟和密闭取心井资料对孤岛油田中一区聚合物驱后油层平面、层间、层内的波及状况进行了系统研究。结果表明,聚合物驱可有效地提高油层的动用状况,扩大平面波及系数,减小层间差异,使层内纵向动用更加均匀。

Main mechanism of the polymer flooding for enhancing oil recovery is to extend the swept volume. Research on sweep conditions of the oil reservoir after polymer flooding is the foundation of effect evaluation and further enhancing oil recovery.Combined with reservoir numerical simulation and sealing core drilling data,the sweep conditions on plane,in layer and between layers after polymer flooding were studied in block No.1 of the central area of Cudao oilfield. Results show that polymer flooding can improve the producing reserves effectively, extend the plane sweep efficiency,reduce the difference between layers and balance the in-layer vertical producing.