Experimental Investigation of the Influence of the Adsorption Gas on the Permeability Characteristics of the Coal Containing Gas

Abstract:

A large number of laboratory experiments on the gas seepage characteristics by the self-developed gas-bearing coal triaxial compression experimental system and conducts the comparative analysis of the similarities and differences of the permeability among CO₂, CH₄ and N₂. The results show that given the condition of constant gas pressure, the permeability of the coal sample decreases with the increase of the confining pressure; under the constant confining pressure, the permeability of the coal sample decreases with the increase of the gas pressure; gases of different adsorbabilities have different permeabilities. The stronger the gas adsorption is, the worse its permeability will be; in the axial loading case, the permeabilities of different gases all reduce firstly and increase afterward, showing the generally V-shaped variation law. The results are of certain theoretical values on the in-depth understanding of the migration law of the gas in coal seams.

• Periodical: Advanced Materials Research (Volumes 616-618)
• Pages: 190-196
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.616-618.190
• Online since: December 2012
• Authors: Deng Ke Wang, Jian Ping Wei, Le Wei, Heng Jie Qin
• Keywords: Adsorption Gas, Coal Containing Gas, Permeability, Seepage Characteristics

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