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    不同温度下孔隙压力对煤岩渗流特性的影响机制

    李波波 杨康 袁梅 许江 杜育芹

    李波波, 杨康, 袁梅, 许江, 杜育芹, 2017. 不同温度下孔隙压力对煤岩渗流特性的影响机制. 地球科学, 42(8): 1403-1412. doi: 10.3799/dqkx.2017.107
    引用本文: 李波波, 杨康, 袁梅, 许江, 杜育芹, 2017. 不同温度下孔隙压力对煤岩渗流特性的影响机制. 地球科学, 42(8): 1403-1412. doi: 10.3799/dqkx.2017.107
    Li Bobo, Yang Kang, Yuan Mei, Xu Jiang, Du Yuqin, 2017. Effect of Pore Pressure on Seepage Characteristics of Coal and Rock at Different Temperatures. Earth Science, 42(8): 1403-1412. doi: 10.3799/dqkx.2017.107
    Citation: Li Bobo, Yang Kang, Yuan Mei, Xu Jiang, Du Yuqin, 2017. Effect of Pore Pressure on Seepage Characteristics of Coal and Rock at Different Temperatures. Earth Science, 42(8): 1403-1412. doi: 10.3799/dqkx.2017.107

    不同温度下孔隙压力对煤岩渗流特性的影响机制

    doi: 10.3799/dqkx.2017.107
    基金项目: 

    贵州省科技厅、贵州大学联合资金计划项目 黔科合LH字[2014]7654

    贵州大学引进人才科研基金资助项目 贵大人基合字(2015)30号

    贵州省科学技术基金项目 黔科合J字[2015]2049号

    贵州大学引进人才科研基金资助项目 贵大人基合字(2014)57号

    国家科技重大专项 2016ZX05044

    详细信息
      作者简介:

      李波波(1985-), 男, 讲师, 主要从事岩石力学与工程、煤层气渗流等方面的研究

    • 中图分类号: P554

    Effect of Pore Pressure on Seepage Characteristics of Coal and Rock at Different Temperatures

    • 摘要: 在深部煤层瓦斯抽采过程中,地温较高且孔隙压力逐渐降低,而目前综合考虑温度和孔隙压力对煤岩渗透特性耦合作用的研究较少.利用自主研发的出口端压力可调的三轴渗流装置,以贵州矿区原煤试件为研究对象,进行不同温度下改变孔隙压力的渗流试验,并建立了考虑温度的渗透率匹配模型.研究表明,煤岩渗透率随孔隙压力增大按指数函数减小;煤岩渗透率随压差的增大而减小,随温度的升高而降低,在不同的温度状态下,渗透率的下降速率和变化幅度有所不同.在模拟瓦斯开发的物理试验中,压差应尽量小,减少其误差,为建立不同边界条件的渗透率模型提供帮助;随温度的升高,温度突变系数呈增大的趋势;随孔隙压力的增大,温度突变系数呈减小的趋势.温度突变系数在整个阶段不为常数,且割理压缩系数可变,这两个特征更能真实地匹配模型,反映瓦斯的开发过程.

       

    • 图  1  原煤试件

      Fig.  1.  Raw coal samples

      图  2  出口端正压的三轴渗流装置原理

      Fig.  2.  The sketch of traixial seepage device with positive pressure at outlet

      图  3  理想化煤岩双孔隙度模型

      Wang et al.(2014)

      Fig.  3.  Dual porosity model of idealized coal

      图  4  不同温度状态下煤岩渗透率与孔隙压力变化关系

      a.压差Δp=0.1 MPa;b.压差Δp=0.3 MPa;c.压差Δp=0.5 MPa

      Fig.  4.  Relationship between permeability and pore pressure of coal under different temperature

      图  5  不同压差状态下煤岩渗透率与孔隙压力变化关系

      Fig.  5.  Variation relationship between pore pressure and permeability of coal under different pressure difference

      a.T=30 ℃; b.T=50 ℃; c.T=70 ℃

      图  6  不同温度状态下温度突变系数与孔隙压力变化关系

      Fig.  6.  The relationship between temperature mutation coefficient and pore pressure at different temperatures

      a.Δp=0.1 MPa; b.Δp=0.3 MPa; c.Δp=0.5 MPa

      表  1  林华9号煤层原煤基本力学参数

      Table  1.   Basic mechanical parameters of raw coal in No.9 coal seam of Lin Hua

      围压(MPa) 与层理面关系 σc(MPa) E(MPa) ν
      3.0 38.28 1 905.04 0.125 9
      // 39.55 2 114.45 0.114 5
      下载: 导出CSV

      表  2  煤岩数据匹配的模型参数

      Table  2.   Model parameters of coal about data matching

      p(MPa) T(℃) cf0(MPa-1) a(MPa-1)
      0.1 30 -0.006 4 4.002 0
      50 -0.004 2 3.994 2
      70 -0.006 4 4.004 3
      0.3 30 -0.006 2 4.002 1
      50 -0.006 1 3.995 1
      70 -0.007 5 4.023 5
      0.5 30 -0.006 8 4.018 8
      50 -0.008 4 3.995 1
      70 -0.006 3 4.399 7
      下载: 导出CSV

      表  3  不同温度条件下的弹性模量

      Table  3.   Values of elastic modulus under different temperature conditions

      温度(℃) 25 30 50 70
      弹性模量(MPa) 181.46 178.88 168.72 160.00
      下载: 导出CSV
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