Research and application of segmented hydraulic fracturing technology for"directional long drilling+branch hole"gas extraction drilling
In order to solve the problems of uneven fracturing,small coverage,and difficulty in forming holes in the coal seam by conven-tional hydraulic fracturing coal seam permeability enhancement technology under the condition of high gas and soft and crushed coal in individual coal mines,the segmented hydraulic fracturing technology of"directional long borehole+branch hole"gas extraction drilling was studied.RFPA2D-Flow software was used to calculate the key parameters of segmented fracturing,and 402 m of directional long borehole was constructed in Huishun roadway of a coal mine in Shanxi,9 branch holes were opened,and 4 segmented hydraulic fractu-ring were carried out,with a total fracturing water injection of 37.2 m3,and the application of segmented hydraulic fracturing technology was analyzed.The technical application results show that the fracturing effect of gas extraction drilling is obvious,which creates condi-tions for improving the gas extraction effect.
directional long drillingbranch holesublevelhydraulic fracturinggas extraction
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