Gas seepage equation of deep mined coal seams and its application

• Published in: Journal of China University of Mining and Technology Vol. 18; no. 4; pp. 483 - 487
• Main Authors: HU, Guo-zhong, WANG, Hong-tu, TAN, Hai-xiang, FAN, Xiao-gang, YUAN, Zhi-gang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2008
• Subjects: deep mining; gas pressure; gas seepage equation of coal seam; geothermal temperature field; in-situ stress field; 地热温度; 深部矿床开采; 瓦斯泄漏; deep mining; geothermal temperature field; gas seepage equation of coal seam; in-situ stress field; gas pressure
• ISSN: 1006-1266
• DOI: 10.1016/S1006-1266(08)60280-1

In order to obtain a gas seepage law of deep mined coal seams, according to the properties of coalbed methane seepage in in-situ stress and geothermal temperature fields, the gas seepage equation of deep mined coal seams with the Klinkenberg effect was obtained by confirming the coatbed methane permeability in in-situ stress and geothermal temperature fields. Aimed at the condition in which the coal seams have or do not have an outcrop and outlet on the ground, the application of the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields on the gas pressure calculation of deep mined coal seams was investigated. The comparison between calculated and measured results indicates that the calculation method of gas pressure, based on the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields can accu- rately be identical with the measured values and theoretically perfect the calculation method of gas pressure of deep mined coal seams.