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- W3119690251 abstract "Three shale models with pre-existing weak planes (WPs) are established in this study based on three real shale outcrops with different weak planes characteristics. A global embedded 3D cohesive zone model (CZM) is used to simulate the fracture geometry of the hydraulic fractures with three structurally anisotropic shale models. The (Khristianovic-Geertsma-de Klerk) KGD model and Blanton's criterion are used to verify the reliability of the proposed model. Several simulation examples are established to study the effects of the stratification distribution, weak plane density, horizontal stress difference (HSD), injection rate, and fluid viscosity on the fracture geometry in the stratification plane and matrix. In addition, the effects of these variables on the stimulated reservoir volume (SRV) are analyzed. Structurally anisotropic shale has a symmetrical fan-shaped fracture network, a central symmetrically inclined fracture network, and an irregular fracture network along the weak plane direction. There are two types of hydraulic fracture (HF) networks: a fracture network composed of WP fractures and another fracture network composed of WP fractures and matrix fractures. A decrease in the weak-plane density, an increase in the approach angle, an increase in the HSD, an increase in the fracturing fluid viscosity, and an increase in the injection rate all contribute to the formation of MFs and a complex fracture network interlacing WP fractures and matrix fractures. In contrast, it is helpful to form WP fractures and fracture network that is only composed of the WP fracture. When WP fractures coexists with matrix fractures, the opening of the WP fracture is generally 2–4 times larger than that of the matrix fracture, which can easily form the main fracture. With an increase in the approach angle, the width of the SRV gradually increases whereas the length of the SRV decreases first and then increases. This study further supports our understanding of the geometry of complex fractures generated by a hydraulic drive in shale and has important reference significance for well completion design and hydraulic fracturing design in shale development." @default.
- W3119690251 created "2021-01-18" @default.
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- W3119690251 date "2021-04-01" @default.
- W3119690251 modified "2023-09-26" @default.
- W3119690251 title "Numerical simulation of complex fracture geometry caused by hydrodynamics in shale with pre-existing weak planes" @default.
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- W3119690251 doi "https://doi.org/10.1016/j.petrol.2020.108306" @default.
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