Recovering coal bed methane from deep unmineable coal seams and carbon sequestration Online publication date: Tue, 26-Jun-2007
by Thomas D. Brown, Donald K. Harrison, J. Richard Jones, Kenneth A. LaSota
International Journal of Environment and Pollution (IJEP), Vol. 29, No. 4, 2007
Abstract: Published data from nearly 2,000 coal samples comprising 250 coal beds from 17 states, representing many of the coal producing horizons in the USA, shows moderate correlation (0.7) between depth and methane content for high volatile coal ranks. Low-volatile rank coals average the highest methane content, 12.74 m³/ton (450 ft³/ton), subbituminous rank coals the lowest, <0.71 m³/ton (<25 ft³/ton). Experimentation under replicated in situ conditions of triaxial stress, pore pressure and temperature on Pittsburgh No. 8 coal indicate permeability decreases with increasing CO2 pressure, with an increase in strain in the coal associated with its swelling.
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