Abstract
The mechanism of hydraulic fracturing in fractured reservoirs is complex. To understand the complex distribution characteristics of natural fractures and the mechanism of hydraulic fracture propagation in fractured reservoirs, the natural fracture characterization of a two-dimensional model was established based on the fractal method and topology principle. Furthermore, based on this model, the hydraulic fracture propagation dynamic fluid-structure interaction model was built using the global embedded cohesive element method. The influence of natural fracture connectivity on hydraulic fracture morphology was analyzed. The results show that multi-fracture development can effectively reduce the influence of stress anisotropy on the fracture propagation direction and improve the natural fracture connectivity of the reservoir. Moreover, the reservoir connectivity reached 35.87% after fracturing.
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