CHN Energy Shendong Coal Group Co. , Ltd.
School of Electrical Engineering, Xi′an Jiaotong University
Xi′an Flash Energy Technology Limited Company
Mining Branch, Huaneng Yunnan Diandong Energy Co. , Ltd.

云贵地区煤炭资源通常为多煤层叠置构造,煤层薄、煤层数量多、层间距近且构造复杂,不具备保护层泄压开采条件,穿层钻孔抽采效率差,迫切需求煤层增透措施。可控冲击波是一种新型煤层增透技术,已在国内北方地区取得了较好的应用效果。针对云贵地区煤层问题,以云南白龙山煤矿C7+8大块煤样为例使用冲击波进行能量优化实验;采用可控冲击波煤层增透技术结合钻孔及煤层条件设计了“煤层增透”和“岩层预裂”的交叉重叠作业模式和作业参数,并开展先导性试验。结果表明:煤层增透采用30kJ含能棒,岩层预裂采用80kJ含能棒。煤岩结合部增透的5号钻孔较煤层增透的4号钻孔的抽采浓度提高16.2倍,抽采纯量提高15.8倍,较常规穿层钻孔抽采纯量可提高2.8倍。观测后期5号钻孔整体浓度和流量有增加趋势,说明在煤层中部和煤岩结合处交叉冲击作业起到均衡预裂的作用。

The coal seam in Yunnan-Guizhou area usually occurs in a multi-layer overlapping structure, as the coal seams are thin and close, and the geologic structure is complex, the conditions for protective seam mining can not be satisfied, and the efficiency of cross-seam drilling extraction is poor, so the coal seam permeability enhancement measures are urgently needed. Controlled shock wave is a new type coal seam permeability enhancement technology, which has been well applied in northern China. In view of the coal seam problem in Yunnan-Guizhou area, the C7+8 large coal sample of a coal mine is used as a shock wave for energy optimization experiment; the overlapping operation mode and operation parameters of coal seam penetration permeability enhancement and rock seam pre-cracking are designed, combining with the drilling and coal seam conditions, and the pilot test is carried out. The results show that: 30 kJ energy rod can be used for coal seam, and 80 kJ energy rod can be used for rock seam. The extraction concentration of borehole 5 in the coal rock junction was increased by 16. 2 times, and the pure extraction volume was increased by 15. 8 times, which was 2. 8 times higher than that of the conventional cross-seam drilling hole. In the later period, the overall concentration and flow of borehole 5 increased in the later period, which showed that the cross-impact operation was balanced in the middle of the coal seam and the coal-rock junction.

国家重点研发计划课题(2018YFC0808002)

张 迪, 张永民, 李建栋, 等. 可控冲击波煤层增透技术在穿层钻孔中的应用 [J].煤炭工程, 2023, 55(6): 73-78.