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A. Saghafi, H. Javanmard and K. Pinetown Study of coal gas wettability for CO2 storage and CH4 recovery Geofluids 14

Article first published online: 14 MAR 2014 | DOI: 10.1111/gfl.12078

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The gas wettability of coal affects the ease of adsorption and desorption of gases onto and from coal. Using a modified captive gas technique, the magnitude of the ‘receding’ contact angle of CH4, CO2 and N2 bubbles on a bituminous coal in presence of water was studied. The results show that gas wettability is in general higher for CO2 than for CH4 or N2. In most cases, increases in gas-water pressure led to increases in gas wettability of coal.

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