穿层钻孔瓦斯抽采半径研究  

Study on Gas Extraction Radius of Through-layer Drilling

作　　者：孙赫 SUN He(CCTEG Shenyang Research Institute.,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司,辽宁抚顺113122 [2]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤炭技术》2024年第3期165-168,共4页Coal Technology

摘　　要：煤层瓦斯压力大、渗透率低等因素增加了瓦斯抽采工作的难度。针对煤层群条件下的穿层钻孔布置问题,以山西某矿为例,通过数值模拟,现场测试方法对瓦斯抽采半径与抽采效果进行了研究。运用COMSOL模拟软件,分析了φ75、φ94、φ113 m直径抽采钻孔与30、60、90、120 d抽采时间条件下的瓦斯压力演化规律。结果表明:φ113 mm直径钻孔的抽采效果最好,但考虑成本因素,最终选取瓦斯抽采钻孔直径为φ94 mm,极限抽采时间为120 d。通过压降法现场测定了山西某矿5#、8#、12#煤层的有效抽采半径随时间的演化趋势。经瓦斯抽采效果评判,消除了矿井煤与瓦斯突出危险性。The factors of high gas pressure and low permeability in coal seam increase the difficulty of gas extraction.Aiming at the borehole layout through coal seams under the condition of coal seam group,taking acoal mine in Shanxi as an example,the gas extraction radius and extraction effect are studied by numerical simulation and field test.COMSOL simulation software is used to analyze the gas pressure evolution ofφ75 mm,φ94 mm,φ113 m diameter extraction borehole and 30 d,60 d,90 d,120 d extractiontime conditions.The results show that theφ113 mm diameter borehole has the best extraction effect,but considering the cost factor,the final selection of gas extraction borehole diameter isφ94 mm,and the limit extraction time is 120 days.The evolution trends of effective extraction radius of No.5,No.8 and No.12 coal seams in Shanxi a coal mine with time are measured by pressure drop method.By evaluating the effect of gas extraction,the risk of coal and gas outburst is eliminated.

关 键 词：穿层钻孔 瓦斯防治 抽采半径 数值模拟 钻孔布置 

分 类 号：TD712[矿业工程—矿井通风与安全]