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| The influence of fracturing energy anisotropy on hydraulic fracturing path in layered rocks |
| PAN Rui，ZHANG Guangqing |
| (College of Petroleum Engineering，China University of Petroleum(Beijing)，Beijing 102249，China) |
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Abstract For transversely isotropic material，there is a significant difference in fracturing energy along and perpendicular to the bedding plane of layered rocks. In this paper，a fracture path criterion taking the fracture energy anisotropy into consideration was proposed. Under the linear elastic condition，the criterion is transformed into a three-parameter model of fracture toughness，elastic parameters and the ratio of stress intensity factors. The influence of the fracturing energy anisotropy on the hydraulic fracturing path was studied through finite element simulations with the criterion considered in the cohesive elements. The study indicates that the fracturing energy anisotropy is a dominant factor limiting the hydraulic fracture propagation. There is a limit in the ratio of the fracturing energy perpendicular to/along the bedding in different rocks. When the ratio for the fracturing energy perpendicular to/along the bedding is less than the limit value，the fracture will propagate across the layer. As the ratio is around the limit value，the fracture will extend across the layer with deflection. For the ratio is greater than the limit value，the fracture will be deflected along the layer interface.
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2018, Vol. 37 
