| 姚尚文.深部高瓦斯低透突出煤层水力化增透技术模拟分析及试验研究[J].安徽建筑大学学报,2021,29(): |
| 深部高瓦斯低透突出煤层水力化增透技术模拟分析及试验研究 |
| Simulation analysis and experimental study on the anti-reflection technology of hydraulics in deep coal seam with high gas and low permeability outburst |
| 投稿时间：2021-06-28 修订日期：2021-10-01 |
| DOI：10.11921/j.issn.2095-8382.20210629002 |
| 中文关键词: 瓦斯 水力冲孔 有效抽采半径 透气性系数 抽采瓦斯纯量 |
| 英文关键词: Gas hydraulic punching effective extraction radius air permeability coefficient gas extraction scalar |
| 基金项目:深部煤层开采井下水力化措施区域增透强化抽采瓦斯消突机制与关键技术；煤层群卸压开采瓦斯精准高效抽采机制研究（KJ2018A0502） |
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| 中文摘要: |
| 本文以淮南潘二煤矿低透气性A组煤层为试验区，采用理论分析、数值计算和现场工程试验相结合的方法，研究水力冲孔对瓦斯抽采的影响及效果。通过对考察钻孔采取水力化措施，形成水力增透理论。水力冲孔后，储层内孔隙压力发生很大变化，导致地应力场的变化，并在钻孔煤孔段形成较大的圆柱体状洞穴，煤体卸压范围扩大，裂隙入渗进一步扩大，透气性增强。结果表明：在抽采时间30d内，实施水力冲孔措施可使钻孔有效抽采半径达到5m，增加1.25倍，抽采量增加2.68倍，煤体透气性系数增加到原来的2.5倍，衰减系数只有原来的1/3。水力化措施大大提高了抽采量及瓦斯抽采效果，缩短了预抽时间，降低了煤层的突出危险性，保证了安全生产，取得了较好的效果。 |
| 英文摘要: |
| In this paper, taking group A coal seam with low permeability on Paner coal mine in Huainan as the test area, the influence and effect of hydraulic punching on gas extraction are studied by means of theoretical analysis, numerical calculation and field engineering test。The theory of hydraulic reflection improvement is formed by adopting hydraulic measures to the drilling hole. After hydraulic punching, the pore pressure in the reservoir changes greatly, which leads to the change of geostress field and the formation of a large cylindrical cave in the borehole section。The pressure relief range of the coal body is enlarged, the fracture infiltration is further expanded, and the air permeability is enhanced。Results show that the extraction time within 30 d, hydraulic punching measures can make the drilling effective extraction radius to 5 m, increased 1.25 times, the extraction volume increased by 2.68 times, coefficient of permeability of coal is increased to 2.5 times that of the original attenuation coefficient is only 1/3 of the original。Hydraulic measures greatly improve the amount of gas extraction and gas extraction effect, shorten the pre-extraction time, reduce the outburst risk of coal seam, ensure the safety of production, and achieve good results. |
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