Xue Fei, Zhang Nong, Feng Xiaowei, Zheng Xigui, Kan Jiaguang
School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; Hunan Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China.
PLoS One. 2015 Jan 29;10(1):e0115874. doi: 10.1371/journal.pone.0115874. eCollection 2015.
A monitoring trial was carried out to investigate the effect of boreholes configuration on the stability and gas production rate. These boreholes were drilled from the retaining roadway at longwall mining panel 1111(1) of the Zhuji Coalmine, in China. A borehole camera exploration device and multiple gas parameter measuring device were adopted to monitor the stability and gas production rate. Research results show that boreholes 18 with low intensity and thin casing thickness were broken at the depth of 510 m along the casing and with a distance of 214 m behind the coal face, while boreholes 911 with a special thick-walled high-strength oil casing did not fracture during the whole extraction period. The gas extraction volume is closely related to the boreholes stability. After the stability of boreholes 9~11 being improved, the average gas flow rate increased dramatically 16-fold from 0.13 to 2.21 m3/min, and the maximum gas flow rate reached 4.9 m3/min. Strengthening boreholes configuration is demonstrated to be a good option to improve gas extraction effect. These findings can make a significant contribution to the reduction of greenhouse gas emissions from the coal mining industry.
开展了一项监测试验，以研究钻孔布置对稳定性和瓦斯抽采率的影响。这些钻孔是在中国朱集煤矿1111（1）长壁采面的回风巷施工的。采用钻孔摄像探测装置和多种瓦斯参数测量装置来监测稳定性和瓦斯抽采率。研究结果表明，强度低、套管壁厚薄的18号钻孔在距煤壁214 m、沿套管深度510 m处发生破裂，而采用特殊厚壁高强度石油套管的911号钻孔在整个抽采期间未发生破裂。瓦斯抽采量与钻孔稳定性密切相关。9~11号钻孔稳定性提高后，平均瓦斯流量从0.13立方米/分钟大幅增加16倍至2.21立方米/分钟，最大瓦斯流量达到4.9立方米/分钟。事实证明，强化钻孔布置是提高瓦斯抽采效果的一个好选择。这些研究结果可为减少煤炭行业温室气体排放做出重大贡献。
