低渗透油藏储层物性差,非均质性强,常规连续注水方法注水效果差,难以建立有效的驱动体系。为更好补充该地区的地层能量,进一步提高难采储量的动用程度,利用油藏数值模拟方法,以矩形五点法直注平采为基本单元,分别进行不同注入方式、不同注水周期及不同注采比下采出程度的对比分析,结合现场实际模型进行开发效果预测。结果表明,采用对称周期注水、注水井开1 个月关1 个月、注采比1.4 的工作制度进行生产,地层压力能够保持较高水平,含水上升缓慢,周期注水补充能量见效明显。
Low permeability reservoirs have poor physical properties and strong heterogeneity. The conventional continuous waterflooding method can not effectively be used to inject into the formation and an effective driving energy system is difficult to establish. In order to better supplement energy in the region and further enhance the development extent of the reserve, the reservoir simulation method is used with the rectangle five point method for injection of vertical wells as the elementary unit and the production of horizontal wells as a comparative analysis of production levels of different injection styles, different injection periods,and the corresponding injection-production ratio combined with the actual field model to forecast the development efficiency. The result shows that with the working system of symmetrical cyclic waterflooding, and with the water injection well being open for a month then shut for a month, the injection-production ratio is 1.4. The formation pressure alternates smoothly with slowly rising water cut with a good efficiency of supplying the formation energy. The optimized development and production plan might provide some guidance for the oilfields.
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