裂缝性碳酸盐岩油藏化学剂辅助提高采收率研究进展

Research Progress of Chemical Enhanced Oil Recovery in Fractured Carbonate Reservoirs

王 全 张 健 赵 娟 未志杰 康晓东

WANG Quan ZHANG Jian ZHAO Juan WEI Zhijie KANG Xiaodong

碳酸盐岩油藏在全球范围内分布广泛，原油产量占比较高。由于碳酸盐岩储层结构复杂、裂缝发育、非均质性强以及偏油湿的润湿性特征，注水开发的采收率较低，化学剂辅助采油成为进一步提高采收率的有效方法。为了更好地开展该类油藏化学剂辅助提高采收率技术研究，系统总结了化学剂辅助提高采收率的作用机 理、常用表面活性剂及数值模拟方法，介绍了成功应用表面活性剂辅助采油的矿场试验实例，指出了该项技术下一步的工作重点和研究方向。参 37

Carbonate reservoirs widely distributed around the world，with a relatively high proportion of the total oil production. Due to the complex structure，the development of fractures，strong heterogeneity and preferential oil-wet characteristic，the oil recovery of carbonate reservoirs was always low with water injection. Chemical assistance was an effective method to further improve the oil recovery of such reservoirs. In order to further study the chemical EOR technology of fractured carbonate reservoirs，the mechanism，common used surfactants，and numerical simulation methods of chemical EOR for improving the recovery of fractured carbonate reservoirs were systematically summarized. Several examples of field projects that successfully applied surfactant-assisted method for oil recovery were introduced. Finally，the focus of future work and research direction were proposed.