Hydraulic fracturing technology by drilling through strata for outburst prevention in coal roadway strips and its application
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Abstract:
To realize regional gas control in a low permeability coal roadway strip, based on the features of high pressure water, we proposed a hydraulic fracturing technology of drilling through strata in coal roadway strip to prevent outburst by applying the elastic theory. We built a calculation model for coal seam initiation pressure is established, developed a device to export flow rates and pressure, and applied them to an industrial experiment. The experiment results show that concentration and quantity curves of gas drainage in fracturing borehole exhibit characteristics of "high-low-high", which reflects the dual role of hydraulic fracturing. Gas quantity in fracturing boreholes is 20 times and 133 times of those of hydraulic cutting boreholes and ordinary crossing boreholes, respectively. When residual gas content of a coal roadway strip is reduced to 8 m3/t, the elimination effect of the hydraulic fracturing technology of drilling through strata is outstanding.
