Widuri油田聚合物驱可行性研究

Feasibility Study of Polymer Flooding in Widuri Oilfield

针对Widuri油田面临高含水、水驱油藏注水开发效果变差、产量出现递减等情况，展开了聚合物驱的可行性研究工作。研究中采用了岩芯实验及数值模拟方法，筛选出适合于Widuri油田的聚合物体系及注聚的井组。经过性能评价实验显示筛选出的聚合物体系符合油田聚合物驱的要求，注入聚合物的最终采收率可提高21%～25%，驱替效果较好。根据数值模拟结果，对驱替方案进行了设计，预计至2018年9月，水驱最终可采储量197.9×104 bbl，聚合物驱最终可采储量221.5×104 bbl，最终可采储量将增加23.6×104 bbl，采收率提高6.36%。该项目的成功实施，将缓解Widuri油田生产的递减趋势，有效地提高油田的采出程度，为中海油东南亚公司东南苏门答腊区块成功实现投资回收作出巨大的贡献。

Aiming at the conditions of high water cut,poor water injection effect of the sand body and the decline of output, we study the feasibility of polymer flooding in Widuri Oilfield in the paper. The polymer system and the well injection group are selected with the method of core test and numerical simulation. The performance evaluation experiment proves the selected polymeric system to meet the requirement of the oilfield polymer displacement,and the ultimate recovery can be enhanced by 21%～25%after the polymer flooding,which is a desirable displacement effect. With the help of the numerical simulation results,the displacement project is designed,and the ultimate recoverable reserve by water flooding is 197.9×104 bbl,but for polymer flooding is 221.5×104 bbl,which can enhance the recovery of 6.36%. Widuri Field is successfully supported by polymer flooding,decreasing oil production decline rates,and effectively improving oil recovery rates,and hence yielding substantial economic benefits for CNOOC Southeast Sumatra PSC.