滑脱效应和基质变形对低渗透煤体渗流特性影响的试验研究
Experimental Study on Influence of Slippage Effect and Matrix Deformation on Gas Seepage Characteristics of Low Permeability Coal
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摘要: 为了探讨滑脱效应和基质变形对低渗透煤体渗流特性的影响,以渝阳煤矿8#煤层原煤试件为研究对象,进行4种气体在不同压力条件下的渗流平行试验。试验结果表明:当轴压、围压和气体压力恒定时,滑脱效应渗透率表现为,△KHe,b>△KCH4,b>△KN2,b>△KCO2,b;基质变形渗透率表现为煤体对气体的吸附性越强,产生的基质变形渗透率越大,试验结果为△KHe,s<△KN2,s<△KCH4,s<△KCO2,s;在轴压和围压一定条件下,滑脱效应渗透率、基质变形渗透率和有效渗透率均随气体压力的增大呈非线性变化。滑脱效应渗透率与气体压力关系式可表示为△Ki,b=apb;基质变形渗透率随气体压力的增加呈二次函数关系增大,即△Ki,s=ap2+bp +c;有效渗透率随着气体压力的增加呈现出先减小后增大现象,具有明显的滑脱效应,且二者之间变化关系符合二次函数关系,即△Ki,g=apb+bp +c。Abstract: In order to study the influence of slippage effect and matrix deformation on gas seepage of low permeability coal, based on 8# coal seam of coal core samples of Yuyang Coal Mine, the gas permeability of coal samples is studied by using four kinds of gas. The results show that: when axle loading, confining pressure and gas pressure is constant, the permeability induced by slippage effect shows △KHe,b>△KCH4,b>△KN2,b>△KCO2,b, and the permeability induced by matrix deformation shows that the stronger adsorbability will cause bigger matrix deformation under the same gas pressure level, namely, △KHe,s<△KN2,s<△KCH4,s<△KCO2,s; the permeability induced by slippage effect (△Ki,b), the permeability induced by matrix deformation (△Ki,s) and the effective permeability (△Ki,g) all represent the nonlinear change with the increase of gas pressure under fixed axial and confining pressure. The relationship between the permeability induced by slippage effect (△Ki,b) and gas pressure can be expressed as △Ki,b=apb,and the relationship between the permeability induced by matrix deformation (△Ki,s) and gas pressure can be expressed as △Ki,s=ap2+bp +c,and the relationship between the effective permeability (△Ki,g) and gas pressure can be expressed as △Ki,g=apb+bp +c.
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