基于连通性方法的缝洞型油藏优势窜流通道识别

Identification method of dominant channeling in fractured vuggy carbonate reservoir based on connectivity model

缝洞型油藏注水开发过程中,裂缝发育及储层非均质性往往会使注入水沿着优势通道窜进,造成油井含水异常或不同程度水淹。文中综合井间连通性计算结果、油藏地质信息、生产动态资料,建立实时更新的传导率变化体系和油藏窜流通道判别方法,运用连通性方法计算水井平面注水劈分系数和注水效率。经与现场示踪剂解释及传统注采受效分析结果对比验证,两者测试结果与基于连通性方法的计算结果相吻合,表明该方法能够应用于缝洞型油藏优势窜流通道的识别,对油田实施调剖堵水具有一定的指导意义。

During the development of waterflooding, because of the reservoir heterogeneity in fractured vuggy carbonate reservoirs, the injected water breaks through the dominant channels and leads to the strong fluctuation and increasement of water cut. In this paper, reservoir geological information and production dynamic data are synthesized to establish an inter-well connectivity model, which can calculate the injection allocation factor and water injection efficiency to identify the dominant channeling. Compared with the results of field tracer interpretation and conventional analysis of water flooding performances, the calculation results based on the connectivity method are consistent with the results of field tracer interpretation and conventional analysis of water flooding performances. The result shows that this method could be applied to identify the dominant channels in fractured vuggy carbonate reservoirs and guide the implementation of profile control and water shutoff in the oil field.