Hebi Coal and Power Co., Ltd. No.3 Coal Mine

针对鹤煤三矿穿层钻孔施工采用传统打钻技术存在的打钻工程量繁重、钻孔布置密集度较高、瓦斯抽采效率较低等缺点,深入分析煤层赋存条件,研究优化抽采工艺与全程筛管固孔的方法,确定穿层钻孔布置形式,通过底抽巷穿层钻孔实施水力冲孔的方式,实现瓦斯灾害的快速治理。实践表明,相同条件下实施穿层钻孔水力冲孔技术,能大幅度提高单孔瓦斯抽采浓度,煤层瓦斯能够得到充分释放,促使煤层裂隙数目与透气性显著增加,有效改变了初始瓦斯分布状况,消除了新建工作面煤层应力集中现象,达到防治瓦斯突出的目的。

In view of the drawbacks of traditional drilling technology in the construction of cross layer drilling hole in Hemei No.3 Mine, such as heavy drilling workload, relatively high density of drilling hole layout, and relatively low gas extraction efficiency, an in-depth analysis of coal seam occurrence conditions is conducted. The optimization of extraction process and the method of whole process sieve tube fixing hole are studied to determine the layout form of cross layer drilling hole. Hydraulic punching is implemented through the method of bottom drainage roadways cross layer drilling hole to achieve rapid governance of gas disasters. The practice shows that under the same conditions, implementing cross layer drilling hole hydraulic punching technology can significantly increase the concentration of gas extraction in a single hole, fully release coal seam gas, significantly increase the number and permeability of coal seam cracks, effectively change the initial gas distribution condition, eliminate the phenomenon of stress concentration in coal seams in new built working faces, and achieve the purpose of preventing and controlling gas outbursts.