Physical-Mathematical Model of Methane Flow in Nonstationary Stress Field in Coal Seam
M. V. Kurlenyaa1, K. H. Leeb2, V. G. Kazantsevc3, Hee Lee Eun2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2VostNII Science Center, Kemerovo, Russia
3cIndustrial Safety LLC, Biysk, Russia
Keywords: Modeling, coal seam, gas drainage, flow, sorption pressure, stress state, occlusion stress, piezoconductivity
Abstract
A physical-mathematical model of natural gas flow in methane-containing coal seams is built using the concept of interaction of geomechanical and gas-dynamic factors in coal degassing process. Methane flow calculation is performed, and it is found that the cause of the decrease in the methane yield is the increase in stresses around producing wells, the change in the occlusion pressure of gas in cracks and pores, as well as the piezoconductivity of rock mass.
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