摘要
特低渗透油藏注水过程中产生注水动态裂缝,导致油井生产特征差异大、油水渗流规律复杂。为综合考虑动态裂缝和基质非线性渗流对开发的影响,通过开发动态、岩石力学及各类测试资料分析,确定了动态裂缝开启压力界限及延伸规律。利用"方向性压敏效应"表征最大主应力方向动态裂缝开启与延伸,结合"非线性渗流"表征侧向基质驱替,改进了特低渗透油藏渗流模型。利用改进的模型准确预测出WY油藏剩余油富集区域,指导了油藏井网的加密调整,提高水驱采收率5百分点,为剩余油分布预测及水驱开发调整提供了依据和手段。
Dynamic fracture will be produced during the process of ultra-low permeability reservoir water flooding. Dynamic fracture causes huge differences among oil well production characteristics and makes the flow law more complex. In order to study the influence of dynamic fracture and matrix nonlinearity, the dynamic fracture opening pressure boundary and its extension law were determined through the analysis of rock mechanics, development trends and all kinds of test data. Using the ＂sensitive directional effect＂ to characterize the opening and extension of dynamic fracture in the maximum principal stress direction and ＂non-linear seepage＂ to characterize lateral matrix displacement, the seepage model of ultra-low permeability reservoir was improved. With the improved model, WY reservoir remaining oil-rich region was accurately predicted, which guided the encryption adjustment and improved water flooding recovery by 5%. This model provides the basis and means for the prediction of the remaining-oil distribution and the adjustment of water flooding.
出处
《断块油气田》
CAS
北大核心
2016年第5期630-633,共4页
Fault-Block Oil & Gas Field
关键词
特低渗透油藏
动态裂缝
侧向驱替
非线性渗流
剩余油分布
ultra-low permeability reservoir
dynamic fracture
lateral displacement
non-linear seepage
remaining-oil distribution
