The interactions between natural fractures (NFs) and a hydraulic fracture (HF) are most relevant to generate a stimulated reservoir volume in unconventional reservoirs. Understanding these interactions and embedding them into models is essential for predicting their effect and thus optimizing stimulation treatments. We present a finite elements (FE) model of hydraulic stimulation, focusing on the interaction HF-NF. The model is based on the full elasticity problem and established cohesive zone models, guaranteeing its abiding by fracture mechanics theory. The preexisting discontinuity is endowed with distinct interface properties, and the interaction is fully resolved within the FE simulation. The model is first validated with experimental data (Blanton, 1982). A parametric analysis is performed to elucidate the competition between crossing and reactivation regimes. Calculated and experimental results are in good agreement. The model is then used to carry out a parametric analysis of the interaction for the case of an Argentinean unconventional reservoir. A range of behaviors is predicted for this case.
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