Bai X.-H.,China University of Mining and Technology |
Bai X.-H.,Henan Provincial Coal Bed Methane Development and Utilization Co. |
Wu C.-F.,China University of Mining and Technology |
Geng Y.,Henan Provincial Coal Bed Methane Development and Utilization Co. |
And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society
In order to research the problem of gas in severe-outburst and low-permeability single coal seam, by applying the fracture mechanics and elastic theory, a technology about space mesh hydraulic fracturing by drilling through strata for outburst prevention in severe-outburst and low-permeability single coal seam was presented. A model was established to deduce the value of initiation pressure, and a new device exporting flow rates and pressure was produced. The industrial experiments were implemented with SF6 tracer investigating the fracture network. The results show that the technology can largely increase the permeability of the seam, improve the comprehensive gas drainage rate by 1. 69-1. 83 times, expand the coal seam 0. 581%, and reduce the electromagnetic radiation prediction index 35%-45%.compared with the small areas, this method can eliminate the outburst by increasing permeability with hydraulic fracturing in large areas. Source