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Stress Sensitivity Analysis of Seepage Pores in Coal Briquettes Based on Compressed Exhaust and Pressure-Transient Tests
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-02-28 , DOI: 10.1021/acs.energyfuels.2c03994 Chenghao Wang 1, 2, 3 , Yuanping Cheng 1, 2, 3 , Liang Wang 1, 2, 3 , Jingyu Jiang 1, 2, 3 , Zhaonan Jiang 1, 2, 3
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-02-28 , DOI: 10.1021/acs.energyfuels.2c03994 Chenghao Wang 1, 2, 3 , Yuanping Cheng 1, 2, 3 , Liang Wang 1, 2, 3 , Jingyu Jiang 1, 2, 3 , Zhaonan Jiang 1, 2, 3
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Seepage pores are the main space for methane transport in the coal seam. To further investigate variation laws of seepage pores with stress, this study established a new method based on the compressed exhaust and pressure-transient tests to characterize the seepage pore size distribution under different effective stress conditions. The reconstituted coal briquette and nonabsorbent helium were adopted as the experimental samples. The results showed that the deformation of coal mass mainly originates from seepage pores. With the increase of confining stress, the volume reduction of seepage pores presents a logarithmic growth. The initial seepage porosity of the tectonic coal specimen, i.e., the seepage porosity when effective stress is zero, was estimated to be 5.28%, accounting for 36.24% of the total porosity obtained by helium saturation. When effective stress is in the range of 13–48 MPa, the size of seepage pores generally ranges from 0.1 to 1.0 μm. The volume of seepage pores with sizes ranging from 0.1 to 0.5 μm always accounts for more than 80% of the volume of total seepage pores, and this proportion is not affected by effective stress. The inverse proportional coefficient between the threshold pressure gradient of helium and seepage pore diameter was finally determined to be 0.55 ± 0.19 mPa.
中文翻译：
基于压缩排气和压力瞬态试验的型煤渗孔应力敏感性分析
渗流孔是煤层甲烷运移的主要空间。为了进一步研究渗流孔隙随应力的变化规律，本研究建立了一种基于压缩排气和压力瞬态试验的新方法，用于表征不同有效应力条件下渗流孔径分布。采用再造型煤和非吸收性氦气作为实验样品。结果表明，煤体的变形主要来源于渗流孔隙。随着围压的增加，渗流孔体积减少量呈对数增长。构造煤样品的初始渗流孔隙率，即有效应力为零时的渗流孔隙率，估计为5.28%，占氦饱和法得到的总孔隙率的36.24%。当有效应力在 13～48 MPa 范围内时，渗流孔径一般为 0.1～1.0 μm。0.1～0.5 μm的渗孔体积占总渗孔体积的80%以上，且该比例不受有效应力的影响。最终确定氦气启动压力梯度与渗流孔径的反比例系数为0.55±0.19 mPa。
更新日期：2023-02-28
中文翻译：
基于压缩排气和压力瞬态试验的型煤渗孔应力敏感性分析
渗流孔是煤层甲烷运移的主要空间。为了进一步研究渗流孔隙随应力的变化规律，本研究建立了一种基于压缩排气和压力瞬态试验的新方法，用于表征不同有效应力条件下渗流孔径分布。采用再造型煤和非吸收性氦气作为实验样品。结果表明，煤体的变形主要来源于渗流孔隙。随着围压的增加，渗流孔体积减少量呈对数增长。构造煤样品的初始渗流孔隙率，即有效应力为零时的渗流孔隙率，估计为5.28%，占氦饱和法得到的总孔隙率的36.24%。当有效应力在 13～48 MPa 范围内时，渗流孔径一般为 0.1～1.0 μm。0.1～0.5 μm的渗孔体积占总渗孔体积的80%以上，且该比例不受有效应力的影响。最终确定氦气启动压力梯度与渗流孔径的反比例系数为0.55±0.19 mPa。
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