Abstract—

The planar quasi-three-dimensional model of propagation of a hydraulic fracture in the reservoir characterized by the heterogeneous fracture toughness is constructed to investigate the fluid flow and fracture evolution. In order to simulate the heterogeneous layered reservoir with various fracture toughnesses, three typical cases of the reservoir are considered, namely, the reservoir with zones of weakness, the homogeneous reservoir, and the reservoir with zones of increased strength. The results show that heterogeneous fracture toughness of the reservoir affects strongly the shape of fracture, the fluid flow, and the general fracture opening (width) as compared with the homogeneous reservoir in which the radial fracture growth is implemented. Moreover, the effect of the heterogeneous fracture toughness of the reservoir on the fracture growth is mainly noted in the earlier stage. After a certain instant of time, the fracture propagates in various directions at approximately identical velocity.

中文翻译：

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在平面3D公式中模拟非均质裂缝-韧性储层水力裂缝中的流体流动

摘要-

建立了以非均质裂缝韧性为特征的水力裂缝在油藏中传播的平面准三维模型，以研究流体流动和裂缝演化。为了模拟具有不同断裂韧度的非均质层状油藏，考虑了三种典型的油藏案例，即弱化带，均质油藏和强度增大的油藏。结果表明，与实施径向裂缝增长的均质储层相比，储层的非均质裂缝韧性对裂缝的形状，流体流动和总体裂缝开口（宽度）有很大影响。而且，储层非均质裂缝韧性对裂缝发育的影响主要体现在早期。在某一时间段之后，裂缝以大致相同的速度沿各个方向传播。