Abstract
A new triple-porosity model is proposed based on the fractal properties, multiscale flow properties, multiple transport mechanisms and multilayer adsorption/desorption in organic matter pores (OMP), inorganic matter pores (IMP), and fracture network (FN). This model is validated by field gas production data and the key factors affecting gas production are explored. Results show that gas flow is of temporal and spatial multiscale. Shale gas is extracted firstly from hydraulic fractures, then FN and IMP, finally OMP. More adsorbed gases are desorbed and surface diffusion is enhanced when gas pressure decreases. Slip flow is the dominate gas transport mechanism in OMP and IMP. The surface diffusion in OMP and the Knudsen diffusion in IMP are not ignorable contributors to gas production. The OMP contributes 21% of gas production in the later stage. This new triple-porosity model is more accurate than single-porosity and dual-porosity models in gas recovery.
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