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大庆萨南油田在聚驱开发过程中,为增强开发效果,在前期交替注入试验取得一定经验的基础上,继续采用交替注入的方式提高聚合物利用率,改善不同阶段聚合物的驱油效果。扩大交替注入规模。技术人员根据油层发育特点,将注入井和采出井划分成薄注薄采和薄注厚采两种注采类型,根据油层发育及连通关系,个性化设计两种不同交替注入方式。其中,薄注薄采井组采取低浓度、高强度、大段塞交替注入;薄注厚采井组采取高浓度、低强度、小段塞交替注入。
Daqing Sannan Oilfield in the process of poly flooding, in order to enhance the development effect, based on the previous experience of alternating injection experiments, based on the continued use of alternative injection to improve polymer utilization and improve the polymer displacement effect of different stages. Expand the scale of alternative injection. According to the characteristics of reservoir development, technicians divide injection well and production well into two types of injection and production: thin injection thin injection and thin injection thick injection. According to the relationship between reservoir development and connectivity, two different alternate injection methods are designed individually. Among them, the thin injection thin-mined well group adopts low concentration, high intensity and large slug alternate injection; thin thin-thick production well group adopts high concentration, low intensity, small slug alternately.