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Journal of Mining Sciences

2016 year, number 2

Effect of Gas Content and Actual Stresses on Coalbed Permeability

V. N. ZAKHAROV, O. N. MALINNIKOVA, V. A. TROFIMOV, YU. A. FILIPPOV
Institute of Integrated Mineral development, Russian Academy of Science, Kryukovskii tupik 4, Moscow, 111020 Russia
Keywords: углепородный массив, проницаемость, метан, фильтрация, напряжение, coal-rock mass, permeability, methane, seepage, stress

Abstract

The analytical review covers the key factors that influence permeability of a coalbed under mining-induced alteration of stress state. The authors put forward an analytical relation between coal permeability, stresses and adsorbed gas to define parameters of gas leakage zone parameters and laws of mass-transfer. The analytically derived relation is compared with the known model of coal structure and with the experimental results. The proposed model of coalbed permeability allows mechanism of leakage and localization of seepage zones in coal provided that the model parameters are properly selected or found experimentally.