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Design and control of hydraulic stimulation jobs in naturally fractured rock is challenging due to interaction between injection-induced fractures and natural fractures. Dynamic stress transfer between the two fracture systems and the resulting slip response of the natural fractures are key to understanding the temporal evolution of hydraulically- and mechanically-stimulated reservoir volumes. Here, we present a computational model of interaction between induced and natural fractures based on numerical simulation of coupled flow, deformation, and failure processes. By capturing the time dependence of stress and energy transfer mechanisms between hydraulic and natural fracture systems, our model allows us to better understand the mechanical response of natural fractures to hydraulic fracturing for the purpose of upscaling such responses in field-scale simulation models.

Evolution of Stress Transfer Mechanisms During Mechanical Interaction Between Hydraulic Fractures and Natural Fractures