Research and Practice on Fluctuation Water Injection Technology at Low Permeability Coal Seam
In order to solve the problem of poor affusion effect on low permeability coal seam, the paper analyzes the micro process of the coal seam water infusion in wetting coal and determines the main factors affecting coal seam water infusion. The permeability of the NO.3 coal seam in east working face of Xingcun coal mine by MTS815.03 servo-controlled rock mechanical test system has been tested. Results show that when the peak stress in coal sample specimens reaches 48.53MPa, permeability ranges from 0.5158 to 2.9576×10-8Darcy, and it means that the coal seam is low in permeability and difficult in water injection. Based on the characteristics of low permeability and geostress situation, efficient fluctuation water injection technology with permeable agent and relevant process parameters have been designed. The surface tension of the permeable agent developed here is 31.18mN/m when mass concentration reaches 0.05％. The permeable agent can permeate into 2cm thick coal layer completely in 10s, thus improving the wettability of water effectively and the water injection pressure fluctuates between 7MPa and 25MPa. The application of the technique in the 3rd coal seam in east working face of Xingcun coal mine shows not only single-arch injection experienced a significant increase on average, from no more than 10m3 to 63.3886m3, but also the effect of dust fall, cooling and rock burst prevention is remarkable.
low permeability coal seam fluctuation water injection permeable agent dust fall rock burst cooling
CHENG Wei-min NIE Wen ZHOU Gang YU Yanbin MA Youying XUE Jiao
Key Laboratories of Coal Mine Disaster Prevention and Control, College of Resources and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266510, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1066-1075
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）