Dual poroelastic response of a coal seam to CO2 injection

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Impact of transition from local swelling to macro swelling on the evolution of coal permeability (2011, background): “The permeability is primarily determined by the cleat aperture (Wu et al., 2010a, b; Zhang et al., 2008).”
Influence of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Model development and analysis (2012, background): “In our previous studies (Zhang et al., 2008; Chen et al., 2009, 2010; Liu et al., 2010a, 2010b; Wu et al., 2010, 2011), a series of single poroelastic, equivalent poroelastic, and dual poroelastic models were developed to simulate the interactions of multiple processes triggered by the injection or…”
A Mathematical Model of Coupled Gas Flow and Coal Deformation with Gas Diffusion and Klinkenberg Effects (2015, unknown): “M is the constrained axial modulus, MPa, where M ¼ Eð1 tÞ=½ð1þ tÞð1 2tÞ : The cubic law for absolute gas permeability, which varies with porosity, can be expressed as (Wu et al. 2010): k1 k10 ¼ /f /f0 3 ¼ 1þ 1 M/f0 ½bfðpf pf0Þ þ bmðpm pm0Þ þ eL /f0 K M 1 pm PL þ pm pm0 PL þ pm0 3 ð24Þ Combining Eqs.”