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低煤阶煤中甲烷扩散性能分析

孟召平 张贵元 李国庆 刘金融

孟召平, 张贵元, 李国庆, 刘金融. 低煤阶煤中甲烷扩散性能分析[J]. 煤田地质与勘探, 2019, 47(2): 84-89. doi: 10.3969/j.issn.1001-1986.2019.02.014
引用本文: 孟召平, 张贵元, 李国庆, 刘金融. 低煤阶煤中甲烷扩散性能分析[J]. 煤田地质与勘探, 2019, 47(2): 84-89. doi: 10.3969/j.issn.1001-1986.2019.02.014
MENG Zhaoping, ZHANG Guiyuan, LI Guoqing, LIU Jinrong. Analysis of diffusion properties of methane in low rank coal[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(2): 84-89. doi: 10.3969/j.issn.1001-1986.2019.02.014
Citation: MENG Zhaoping, ZHANG Guiyuan, LI Guoqing, LIU Jinrong. Analysis of diffusion properties of methane in low rank coal[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(2): 84-89. doi: 10.3969/j.issn.1001-1986.2019.02.014

低煤阶煤中甲烷扩散性能分析

doi: 10.3969/j.issn.1001-1986.2019.02.014
基金项目: 

山西省科技重大专项课题(20181101013-5);国家科技重大专项任务(2016ZX05067-001-006,2016ZX05043-001-001);山西省煤层气联合研究基金课题(2014012001,2015012014)

详细信息
    第一作者:

    孟召平,1963年生,男,湖南汨罗人,博士,教授,博士生导师,从事煤与煤层气开发地质的研究工作.E-mail:mzp@cumtb.edu.cn

  • 中图分类号: TD713

Analysis of diffusion properties of methane in low rank coal

Funds: 

Science and Technology Major Project of Shanxi Province(20181101013-5)

  • 摘要: 甲烷在煤基质中的扩散性能是影响煤层气产出的重要储层参数。采用云南东南部地区新近系中新统小龙潭组褐煤样品,开展了低煤阶煤中甲烷等温吸附实验。基于等温吸附实验获得的吸附量与时间的关系数据,应用一元孔隙结构气体非稳态扩散模型,计算了煤中甲烷气体扩散系数,揭示了煤中甲烷扩散规律和控制机理。研究结果表明,低煤阶煤中气体扩散规律服从Langmuir方程,煤中甲烷有效扩散系数和扩散系数随着压力的增高而增大;吸附时间常数随着压力的增高而减小,服从负指数函数规律。4个实验煤样Langmuir有效扩散系数和扩散系数分别是(1.71~5.46)×10-4 s-1和(2.17~6.91)×10-12 m2/s,Langmuir压力为0.63~1.97 MPa。在相同温度和压力条件下,干燥煤样的有效扩散系数和扩散系数大于平衡水分煤样,随着温度的增高,其有效扩散系数和扩散系数增加,煤中气体扩散性能增强。

     

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出版历程
  • 收稿日期:  2019-01-29
  • 发布日期:  2019-04-25

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