High-efficient pre-extraction technology of coal seam gas in Huangling No.2 Coal Mine
In order to improve the accuracy and science of drilling arrangement in bedding,a fluid-structure coupling mathe-matical model of gas-containing coal was established based on Fick's diffusion law,Darcy's Law,ideal gas equation of state and generalized Langmuir equation.COMSOL Multiphysics simulation software was used to analyze the influential law of borehole diameter and spacing on coal seam gas pre-extraction of borehole.The results show that the attenuation range and effective influential radius of coal seam gas pressure are larger when the diameter of borehole is larger in a certain range.Under different spacing of borehole,the gas pressure near the borehole is the smallest,while the gas pressure away from the borehole is gradually increased.When the expected extraction target is required to be achieved within the pre-extraction time,the optimal borehole layout is 90 mm in diameter and 6 m in spacing.
gas pre-extractionbedding drillingnumerical simulationarrange drilling spacingborehole diameter
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