三类油层周期分质注聚的做法与效果分析

Application and analysis on periodic polymer flooding for Class Ⅲ reservoir

结合三类油层层间矛盾较大的特点,在分注后期含水上升阶段,开展了同井交替周期分质注聚,采用现有分注工艺管柱,对调整层投捞水嘴,对同井不同类型油层注不同相对分子质量聚合物。研究探索了不同类型油层注聚合理参数、油层动用状况、周期分质注聚对提高采收率的作用。现场试验表明,周期分质注聚阶段取得了最佳期平均单井日增油1.3倍,综合含水下降5.7个百分点的效果,聚驱阶段实际提高采收率10.23%,对三类油层开发具有重要指导意义。

Combining with characteristics of large interla,vers interference for Class Ⅲ reservoir, ahernativey periodic polvmer flooding in same well in later stage is performed with increasing water cut. Applying current separate zone injection technical string, bailed water nozzles are used in adjusted reservoirs, and different relative molecular weight of polymer is injected in different types of reservoir in a same well. This paper studies effect of reasonable paramevers of polymer flooding, producing performance of reservoirs, and periodic polymer flooding with separate quality on increasing recovery. Field experiment indicates that, periodic polymer flooding with separate quality obtains daily 1.3 times of incremental oil of single well, water cut decreases 5.7% , oil recovery increases 10. 23%.