PETR 40 |
| The prospect of storing CO2 in unmineable coalbeds with the potential for enhanced production of natural gas has renewed interest in quantifying the basics of gas-coal interactions. CO2, CH4, and N2 adsorption and swelling were quantified for dry Blind Canyon, Pittsburgh #8 and Pocahontas Argonne Premium coals and their kinetics were analyzed. Strain measurements were made perpendicular and parallel to the bedding plane on ~7x7x7 mm3 coal blocks and gravimetric sorption measurements were obtained simultaneously on companion coal blocks exposed to the same gaseous environment. The adsorption amount and strain were determined after equilibration P<1.8 MPa. There is a strong non-linear correlation between strain and the quantity of gas adsorbed. The dependence of the coal matrix shrinkage/swelling coefficient (Cgc) on both the type and quantity of gas adsorbed is seen by plotting the ratio between the strain and the adsorbate concentration against the adsorbate concentration. Cgc increases with increasing CO2 and CH4 concentration measured both parallel and perpendicular to the bedding plane for a given coal and the Cgc data for CH4 and CO2 overlap. |
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Symposium Honoring Martin Gorbaty
8:20 AM-11:55 AM, Monday, August 20, 2007 Boston Park Plaza -- Plaza Ballroom, Oral
Division of Petroleum Chemistry |