马堡煤矿高位钻孔布置参数的优化分析

Optimization analysis of layout parameters of high-level boreholes in Mabao coal mine

为减少高瓦斯煤层的瓦斯灾害,提高高位钻孔瓦斯抽采效率,通过分析计算出马堡煤矿15#煤层上覆岩层移动"三带"高度,即:马堡煤矿15203工作面冒落带高度为10.06~14.46 m,裂隙带高度为38.75~49.95 m.再利用COMSOL数值模拟软件对高位钻孔的仰角、方位角、钻孔长度等因素进行模拟分析,并将确定的高位钻孔最佳布置参数在15203工作面进行工业试验.结果表明:数值模拟高位钻孔最佳布置参数为钻孔倾角宜控制在9°~12°,方位角以30°~45°为宜,钻孔长度为150 m;现场试验高位钻孔最佳布置参数为倾角在8°~11°,夹角在30°~42°,钻孔长度在145~155m,实测数据与模拟结果基本保持一致,为其他低渗透高瓦斯煤层的高位钻孔优化布设提供了参考价值.

To reduce the gas disaster of high gas coal seam and improve the gas drainage efficiency of high-level borehole,the height of the"three belts"of the overlying strata movement of the 15#coal seam in Mabao coal mine was analyzed and calculated.The height of the falling belt of the 15203 working face in Mabao coal mine was 10.06~14.46 m,and the height of the fracture zone was 38.75~49.95 m.Then COMSOL numerical simulation software was used to simulate the elevation angle,azimuth angle and bore length of high-level drilling,and the optimal placement parameters of high-level drilling were tested for 15203 working face.The results show that the optimal arrangement parameters for numerical simulation of high-level drilling are that the drilling inclination should be controlled at 9°~12°,the azimuth should be 30°~45°,and the drilling length should be 150 m.The best placement parameters for high-level drilling in field test are inclination angle of 8°~11°,angle of 30°~42°,and drilling length of 145~155 m.The measured data is basically consistent with the simulation results,which is other low penetration.The high-level drilling optimization of gas coal seam provides reference value.