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Combined effects of directional compaction, non-Darcy flow and anisotropic swelling on coal seam.pdf

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Combined effects of directional compaction, non-Darcy flow and anisotropic swelling on coal seam

International Journal of Coal Geology 109–110 (2013) 1–14 Contents lists available at SciVerse ScienceDirect International Journal of Coal Geology j ourna l homepage: www.e lsev ie r .com/ locate / i j coa lgeoCombined effects of directional compaction, non-Darcy flow and anisotropic swelling on coal seam gas extractionJ.G. Wang a,b,?, Jishan Liu a,b, Akim Kabir c a State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China b School of Mechanical and Chemical Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia c QGC—A BG Group Business, 275 George Street, Brisbane QLD 4000, Australia? Corresponding author at: School of Mechanical and Ch sity of Western Australia, 35 Stirling Highway, Crawley, 424455936; fax: +61 864881024. E-mail address: nuswjg@ (J.G. Wang). 0166-5162/$ – see front matter ? 2013 Elsevier B.V. All /10.1016/j.coal.2013.01.009a b s t r a c ta r t i c l e i n f oArticle history: Received 30 September 2012 Received in revised form 22 January 2013 Accepted 23 January 2013 Available online 28 January 2013 Keywords: Coal seam Anisotropic swelling strain Non-Darcy flow Directional permeability Gas extraction rateThe effects of directional compaction, non-Darcy flow and anisotropic swelling on the extraction of natural gas in coal seam reservoirs are important but notwell understood so far. This paper investigated these combined effects through a numericalmodelwhich fully couples the interactions of coal seamdeformation, anisotropic gas flow in fractures, and anisotropic absorption/adsorption of natural gas in coal matrix. In the sorption process, the Langmuir isotherm is extended by including some microstructure information to describe sorption induced an- isotropic swelling strain (called anisotropic swelling). The Forchheimer equation is reformulated to consider the non-Darcy effect in directional flows (called non-