Simulation numérique de fracturation hydraulique à l'échelle mésoscopique à l'aide d'un modèle lattice
Résumé
Characterizing the path of the hydraulic fracture in a heterogeneous medium and the change of the transport properties of this medium is one of the challenges of current research on hydraulic fracturing. A 2D lattice hydro-mechanical model is used to describe hydraulic fracturing. First, we present the propagation of fracture restricted to the mechanical case. The influence of a natural joint crossed by the fracture is analyzed with the help of a parametric study. Then, the hydro-mechanical coupling is introduced. Results concerning characteristic length and hydraulic fracture behavior are discussed. The size of the area concerned by the change of transport properties, the stimulated reservoir volume, with respect to permeability, is analyzed. This parameter is important in order to evaluate the efficiency of the stimulation by hydraulic fracture in the context of tight hydrocarbon reservoirs.
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