首页|利用CO2气相压裂技术提高煤层透气性:以吉宁煤矿为例

利用CO2气相压裂技术提高煤层透气性:以吉宁煤矿为例

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为破解复杂低渗高瓦斯煤层瓦斯治理技术难题,本文以山西华晋吉宁煤矿 2号煤层2203工作面为研究对象,通过采取CO2 气相压裂增透技术,对 4组(共 12个)抽采钻孔的瓦斯抽采浓度和瓦斯抽采纯量进行分析,得出有效致裂影响范围,进一步评价瓦斯抽采效果和防突效果.结果表明:该地质单元的有效致裂裂缝影响范围为 6~7 m;常规抽采孔的瓦斯抽采纯量为 0.018 m3/min,与其相比,4组抽采钻孔百米瓦斯抽采纯量平均值为 0.179 m3/min,提升了 8.9倍;在衰减区域,瓦斯抽采浓度均值 64.7%、纯量均值 0.150 m3/min,在稳定区浓度,瓦斯抽采均值为 73.2%、纯量均值 0.188 m3/min,相比稳定区域瓦斯抽采参数更高.该技术有效增大了 2号煤层的透气性,提高了瓦斯抽采效率和煤巷掘进速度,减少了钻孔施工投入,缓解了采掘接替紧张的局面.
Improving the permeability of coal seam with CO2 gas phase fracturing technique:a case study in Jining Coal Mine
In order to solve the technical problems of gas treatment in complex low-permeability and high-gas coal seams,this paper takes the 2203 working face of No.2 coal seam in Jining Coal Mine,Huajin,Shanxi Province as the research object.By adopting the CO2 gas phase fracturing anti-penetration technology,the gas extraction concentration and gas extraction purity of 4 groups(12)of extraction boreholes are analyzed,the effective extraction radius is inferred,and the effective fracturing range is determined.Then evaluate the effect of gas extraction and outburst prevention.The results show that:the influence range of effective cracking fractures in this geological unit is 6-7 m.The average gas extraction purity of the four groups of boreholes is 0.179 m3/min,which is 9.9 times higher than that of the conventional extraction holes of 0.018 m3/min.In the attenuation area,the average gas extraction concentration is 64.7%and the average gas extraction purity is 0.150 m3/min.In the stable region,the average gas extraction concentration is 73.2%,and the average gas extraction purity is 0.188 m3/min.It is found that the gas extraction parameter value in the stable region is higher.This technology can effectively increase the gas permeability of No.2 coal seam,improve the efficiency of gas extraction and the speed of coal roadway driving,reduce the investment of drilling construction,and relieve the tense situation of mining succession.

gas controlCO2 gas phase fracturinglow permeability and high gas coal seampressure relief and permeability enhancementphase change crack

杨鹏、韩锦华

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山西华晋吉宁煤业有限责任公司,山西 临汾 042100

陕西太合智能钻探有限公司,陕西 西安 710000

瓦斯治理 CO2气相压裂 低渗高瓦斯煤层 卸压增渗 相变爆破

2024

中国矿业
中国矿业联合会

中国矿业

CSTPCD北大核心
影响因子:0.875
ISSN:1004-4051
年,卷(期):2024.33(z2)