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余吾煤业公司采用放顶煤开采技术,针对低透气性煤层提出了地面钻井抽采采空区瓦斯技术,设计了防剪切破断井身结构和最优布井位置,优化了钻井设计方案。工程实践结果表明,地面钻井单井最长抽采期为57d,纯瓦斯抽采流量最大值为12.94 m3/min,单井累计抽采纯瓦斯39.31×104 m3,上隅角平均预警次数由抽采前8.3次降至1.03次,显著降低了井下瓦斯超限频率,保证了矿井安全高效生产。
Yuwei Coal Mining Company adopted the technology of caving coal mining, put forward the technology of surface drilling and mined-out gas for low permeability coal seam, designed the well structure and the optimal well location by cutting, and optimized the drilling design scheme. The engineering practice shows that the maximum single well drilling time for ground drilling is 57 days, the maximum flow rate of pure gas drainage is 12.94 m3 / min, the single well total gas consumption is 39.31 × 104 m3, the average upper warning angle is from pumping 8.3 times before mining to 1.03 times, significantly reducing the mine gas overrun frequency to ensure safe and efficient production of mines.