摘要
针对中低渗透单一河道储层开发后期注水易沿河道中部突进，导致注水波及系数小，常规水驱调整及剩余油挖潜效果差的问题，开展了中低渗透单一河道储层聚合物驱的可行性研究。优选出适合中低渗透单一河道储层聚驱的聚合物分子量为1200×10^4～1600×10^4。优化注入参数，即聚合物驱注入质量浓度为1000mg／L，注入速度为0．06PV／a，聚合物用置为300mg／（L·PV），可以实现有效渗透率在lOOmD以下储层的有效注入。通过分析中低渗透单一河道储层聚驱效果的影响因素，表明当聚驱控制程度大于80％、驱替距离165m时聚驱效果较好。该研究提高了中低渗透单一河道油藏的采收率，为该类油藏后期挖潜提供了借鉴。
In consideration of the problems of small swept coefficient and poor efficiency of conventional waterflooding adjustment and tapping the potential of remaining oil induced by water breakthrough along the middle channel in the low permeability and single channel reservoir at the late stage of reservoir development,a feasibility study was carried out on the polymer flooding in low permeability and single channel reservoirs.The molecular weight of polymer of 1200×10~4~1600×10~4,which was suitable for polymer flooding in low permeability and single channel reservoirs,was chosen,the parameters of polymer flooding with the concentration of 1000mg/L and the injection rate of 0.06PV/a and its dosage of 300mg/(L·PV)were optimized,by which the effective injection of polymer with effective permeability of 100 mD could be implemented.By analyzing the influencing factors of polymer flooding in the mid-low permeability and single channel reservoirs,the results show that the polymer flooding effect is better when the control degree is greater than 80% and the displacement distance is 165 m.This study improves the oil recovery in the low permeability of single channel reservoirs,it provides reference for the potential tapping in the reservoirs at the late stage of development.
出处
《长江大学学报（自科版）（中旬）》
2016年第4期16-21,共6页
Journal of Yangtze University(Nature Science Edition)
关键词
中低渗透储层
河道砂体
聚合物驱
注入参数
middle and low permeability
channel sand body
polymer flooding
injection parameter
