The Pressure Relief and Permeability Increase Mechanism of Crossing-Layers Directional Hydraulic Fracturing and Its Application
In order to reduce roof-floor blind area of hydrofracture in underground mines, expand influenced range of fracturing, improve the effect of hydrofracture, a pressure relief and permeability increase model of hydraulic fracturing was built on the basis of analysing the mechanism of crack initiation and the characteristics of fracture development. After discussing the mechanism of directional hydraulic fracturing and carrying out related numerical simulation, a directional hydraulic fracturing technique was proposed. The coal fracture development distribution rule in the process of directional hydraulic fracturing was analysed, and the directional hydraulic fracturing technique was applied in the F15-31010 mining workface of The Twelfth Coal of Pingdingshan Coal Mining Group. The results show that single-drill hole fracturing effective radius rise to 6m under the pressure of 27Mpa, which is 3-5 times more than before, and the average concentration of single-drill hole gas drainage promote to 87.5％, average flow up 55.6％ than no-directional hydraulic fracturing. All these suggest that the technology obtains remarkable effect, and has a high application value.
cross layer directional hydraulic fracturing pressure relief and permeability increase RFPA2D-Flow software
Youping XU Cheng ZHAI Lisha HAO Xin SUN Yang LIU Xianzhong LI Quangui LI
School of Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China Xuzhou Mechanical and Electrical Engineering School
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
1319-1328
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）