Application Research on Directional Long Borehole Hydraulic Fracturing and Penetration Enhancement Technology
In order to improve the permeability and extraction volume of coal seams in high gas and low permeability mines,a directional long borehole hydraulic fracturing technology is proposed,and a three hole fracturing process is designed,including one-time three-stage fracturing,integral fracturing,and one-time two-stage fracturing.After one month of fracturing,the gas concentration in all three holes exceeded 90%,and compared with before fracturing,the gas content in the three holes increased by 10%,30%,and 60%respectively.Compared with the end of the fracturing process,there were increases of 75%,75%,and 90%respectively.Compared with the negative pressure of 15 kPa during extraction,the gas flow rate increased by about 20 times when the negative pressure was 20 kPa,indicating a better gas control effect.
directional long drillinghydraulic fracturinggas extraction
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维普
