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为尝试研究非均匀层状岩体中的复杂水力压裂裂缝延伸行为,以胜利油田某典型砂泥薄互层油藏的水平井压裂为背景模型,利用基于有限元的数值模拟软件,开展了一系列压裂裂缝延伸行为的数值模拟研究。数值模拟表明,水力压裂裂缝的延伸模式是远场地应力及地层岩性的综合作用结果。裂缝延伸过程中遇到层间界面会出现很多的偏转、分叉和终止行为。数值模拟初步解释了裂缝延伸过程中应力演化及其与层间界面的相互作用机制,可望为水力压裂改造工程相关的设计与机理分析提供些许参考。
In order to study the fracturing behavior of complex hydraulic fractures in heterogeneous stratigraphic rock mass, a fractured horizontal well in a typical sand and thin interbedded reservoir in the Shengli Oilfield was used as a background model. Based on the numerical simulation software based on the finite element method, A series of numerical simulation studies on the behavior of fracture propagation in fractures are presented. Numerical simulations show that the extension mode of hydraulic fracturing is the combined effect of far-field stress and formation lithology. There is a lot of deflection, bifurcation and termination of the interface encountered during the crack propagation. Numerical simulations preliminarily explain the stress evolution and the interaction mechanism with the interfacial interface in the process of fracture extension, which may provide some reference for the design and mechanism analysis of hydraulic fracturing engineering.