文章基本信息

标题：Analysis on Production of Coal Bed Methane Considering the Change in Permeability of Coal Rock
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作者：Zhu Likai ; Ji Youjun ; Yang Tianhong 等
期刊名称：Open Petroleum Engineering Journal
印刷版ISSN：1874-8341
出版年度：2016
卷号：9
期号：1
页码：289-298
DOI：10.2174/1874834101609010289
出版社：Bentham open
摘要：Based on the mechanism of migration of the coal bed methane (CBM), and taking into account the deformation of the coal rock during the process of CBM production was also taken into account, a coupled mathematical model considering the interaction of solid and fluid for methane extraction was built. The coal gas extraction of JINcheng coal mine was taken as an example, some typical coal sample was chosen to test the permeability under different confining pressure. The curve for permeability of coal rock versus effective stress under different confining pressure was obtained, a numerical model considering the variation of permeability for methane extraction was set up. The influence of deformation of coal rock on the gas production was simulated and analyzed. The simulation results indicate that the productivity curve considering deformation of rock is closer to the actual production data, at the initial stage of production, the gas rate is less than the case without considering deformation of rock, but the time of stable yield will last longer, and this matches the actual methane extraction, therefore, we recommend that the deformation of coal seam should be considered during the prediction of methane production for JINcheng coal mine.
关键词：Deformation; Methane; Numerical Simulation; Prediction for production of CBM.