Analysis on borehole instability and control method of pore-forming of hydraulic fracturing in soft coal seam

被引：0

作者：

Zhai, Cheng ^{[1
,2
]}

Li, Quan-Gui ^{[1
,2
]}

Sun, Chen ^{[1
,2
]}

Ni, Guan-Hua ^{[1
,2
]}

Yang, Wei ^{[1
,2
]}

机构：

[1] Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

[2] State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, China

来源：

Meitan Xuebao/Journal of the China Coal Society | 2012年 / 37卷 / 09期

关键词：

Curing - Coal deposits - Coal mines - Coal - Stability - Rocks - Hydraulic fracturing - Boreholes;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Borehole instability deformation mechanism of soft coal seam in coal mine was analyzed, and stresses in roadway surrounding rock and the secondary stress of borehole as the main cause of borehole deformation instability of hydraulic fracturing in coal seam was pointed out. Proposed an effective regional curing pore-forming method, simulated and analyzed the borehole stress field, displacement field and change of plastic failure zone in soft coal seam and the coal seam which cured with high strength material. The results show that the area of displacement and plastic failure zone is bigger while drilling in soft coal seam, and it is prone to instability and failure. Based on regional curing pore-forming method, the cracking in the soft rock surrounding borehole wall can be filled with grout, the strength of the surrounding rock can be steadily reinforced. Thus that area of displacement and plastic failure zone can be decreased and the rate of pore-forming can be enhanced.

引用

页码：1431 / 1436