Hydraulic Fracturing Caving Technology in Fully Mechanized Mining Face with Thick and Hard Roof
Aiming at the problems of difficult caving of thick and hard roof and strong mine pressure in 153320 working face of No.2 well in Sihe Coal Mine of Jinneng Holding Equipment Manufacturing Group Co.,Ltd.,the combination of fracturing boreholes in different layers is used to weaken the hard roof,optimize the hydraulic fracturing parameters of roof boreholes,and carry out on-site industrial test.The results show that after the roof hydraulic fracturing pretreatment technology is adopted,the fracture development in the borehole is obvious,the roof weighting step distance and dynamic load coefficient decrease significantly,and the roof caving effect of thick and hard roof is good.
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