Role of adsorption and swelling on the dynamics of gas injection in coal - article no. B04203

By R. Pini, Stefan Ottiger, L. Burlini, Giuseppe Storti, M. Mazzotti. 2009

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Evaluation of stress-controlled coal swelling processes (2010, background): “Similar work shows an increase in permeability with decreasing effective pressure on the sample when a non-sorbing gas is used but a reduction in permeability with increasing effective stress when an adsorbing gas is used (Pini et al., 2009).”
Impact of transition from local swelling to macro swelling on the evolution of coal permeability (2011, background): “This interpretation is not consistent with laboratoryobservations (Harpalani andChen, 1997; Panet al., 2010; Pini et al., 2009), which show dramatic reduction in permeability with the injection of an adsorbing gas.”
Interactions of multiple processes during CBM extraction: A critical review (2011, background): “However, this is not consistentwith laboratory observations (Harpalani and Chen, 1997; Panet al., 2010; Pini et al., 2009), which show dramatic reduction in permeability with the injection of an adsorbing gas.”
Influence of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Model development and analysis (2012, methodology): “For other permeability models, the physical properties of Young’s modulus and Poisson’s ratio are recovered directly from the experiments (Robertson and Christiansen, 2007; Pini et al., 2009), and fracture compressibility was considered to be variable for both S–D model and C–B model.”