Abstract
This chapter introduces a fully numerical model to simulate gas and water transport in shale nanopores and complex fractures. In addition, a numerical compositional model is introduced to simulate three-phase transport and well interference in tight-oil reservoirs with complex fractures. For shale gas simulation, a new gas diffusivity equation is derived to consider multiple important physical mechanisms such as gas desorption, gas slippage and diffusion, and non-Darcy flow. Heterogeneity, multiphase flow (gas/water), pressure-dependent matrix, and fracture permeability are considered. For complex fractures, we implement a state-of-the-art embedded discrete fracture model (EDFM) method. Through non-neighboring connections, the fast EDFM method can easily and properly handle any complex fracture geometries such as nonplanar hydraulic fractures and a large amount of natural fractures. The applications of numerical models in analyzing the impacts of various complex fracture geometries on well performance of shale gas reservoirs and well interference of tight-oil reservoirs are discussed.
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