基于井间连通性的碳酸盐岩油藏注采关系优化

碳酸盐岩油藏储集层非均质性强,注水开发时注入水易沿高渗通道窜进,导致生产井发生水窜或水淹、含水率上升速度加快、开发效率低。基于井间连通性原理,根据缝洞型碳酸盐岩油藏的地质特征、开发动态等,可定量表征井间的连通性参数传导率和连通体积,构建碳酸盐岩纵向多层油藏井间连通性模型,进而获取油藏各层注水井平面注水劈分系数、注水利用率等。结合自动历史拟合方法和生产优化算法,实现对油水井生产动态的实时优化和预测。现场应用表明,该方法年增油1.1×10⁴ m³,具有较好的增油效果,对同类型油藏的高效开发有重要指导意义。

Injection-Production Optimization of Carbonate Oil Reservoirs Based on a Well Connectivity Model

Carbonate oil reservoirs are very heterogeneous, so that injected water is easy to advance through high-permeability channels, and results in water channeling or flooding, and consequently fast rising water cut and low development effeciency in production wells. Based on the principle of well connectivity, and considering the geological features and development performance of fractured-vuggy carbonate oil reservoirs, parameters of well connectivity (conductivity and connected volume) were quantitatively characterized, then a vertical multi-layer well connectivity model was established, and parameters such as plane splitting coefficient and utilization rate of injected water were estimated for each layer of the oil reservoirs, and finally by using automatic history matching method and production optimization algorithm, real-time optimization and prediction of production performance of oil and water wells were realized. Field application has proved that the yearly incremental oil production is 1.1×10⁴ m³ by using this method and good effect has been obtained. The method has important guiding significance for efficient development of similar oil reservoirs.