ABSTRACT
Directional long borehole hydraulic fracturing technology in coal seam is an effective method to improve gas recovery, but there is no ideal method for the detection and evaluation of hydraulic fracturing effect. In order to solve the problem of efficiently and vividly detecting the effect of hydraulic fracturing, a dynamic source and dynamic receiving transient electromagnetic detection device constructed in the fracturing hole in the coal mine is adopted. The 0 – 324 m section of the fracturing borehole in a coal mine is detected before and after fracturing by the push of the drilling rig, and the stereo imaging of the pure anomaly field is extracted for analysis. The results show that the bore-hole transient electromagnetic detection technology is the organic combination and mutual supplement of mine geophysical prospecting, drilling and hydraulic fracturing technology. The fracture direction and extension range are effectively delineated, which can be effectively used to evaluate the effect of hydraulic fracturing in coal mines.
