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Influence of depressurization rate on gas production capacity of high-rank coal in the south of Qinshui Basin, China
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SU Xuefeng,LIU Yan,CUI Zhouqi,ZHANG Jianguo,YU Li,WANG Kai
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Table 1 Measured permeability of cylindrical coal samples from the south of Qinshui Basin.
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| Sample No. | Confining pressure/
MPa | Inlet
pressure/
MPa | Outlet pressure/
MPa | Test
medium | Permea-
bility/
10-3 μm2 | | Sihe-1 | 6.30 | 2.59 | 1.97 | Helium | 0.010 4 | | Sihe-2 | 6.20 | 4.09 | 3.11 | Helium | 0.021 4 | | Gucheng-1 | 1.38 | 0.50 | 0 | Helium | 0.016 9 | | Anze-1 | 11.00 | 3.50 | 3.00 | Helium | 0.028 6 | | Sihe-3 | 6.21 | 1.30 | 0 | Air | 0.070 1 | | Sihe-4 | 6.21 | 1.30 | 0 | Air | 0.112 0 | | Sihe-5 | 6.21 | 1.30 | 0 | Air | 0.011 0 |
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