Mechanism and experiment of substituting high drainage roadway with directional long drilling group to extract pressure-relief gas

作者：Xie Sheng-rong^*; Zhao Yao-jiang; Zhang Shou-bao; Yang Hong-zeng; Xiao Dian-cai; Tian Chun-yang

来源：Journal of Central South University, 2012, 19(9): 2591-2597.

DOI：10.1007/s11771-012-1315-8

• high position fracture ring
• drilling group extraction
• seepage field
• complex function
• permeation mechanical model
• extraction disturbance

By establishing the numerical model in the vertical plane and the similar model in the horizontal plane of gas flow in goaf, the influence of high drainage roadway or drilling on the gas seepage field was analyzed, and the extraction mechanism was clarified. On this basis, the academic thought of directional long drilling group instead of high drainage roadway was put forward. And then using complex function theory, the permeation mechanical model of drilling group with circle distribution in the mining-induced fracture zone was established to explore the coupling relationship between the drilling quantity, extraction volume and the equivalent extraction rate of single drilling. Finally, combined with the concrete geological production conditions, the main parameters of directional long drilling group were determined. The distance between the drilling group center and the air-return roadway is 24 m, the height is 18 m, and the three drillings are in an approximate equilateral triangle distribution with a space of 8 m. The equivalent extraction square is 4.15 m(2). It is shown that the effect of directional long drilling group is evident. The gas content in the upper corner is controlled below 0.95%, the content in the tail roadway is kept below the alarm value, and the content is over 50% in the drill, realizing the secure and effective extraction of coal and gas.

• 出版日期2012-9
• 单位中国矿业大学（北京）; 太原理工大学