Evaluation of hydraulic fracturing effect of CBM well in Gujiao Area of Taiyuan Xishan Coalfield

In order to evaluate the effect of hydraulic fracturing construction in the existing development plan of CBM in Gujiao,the main parameters of fracturing fractures are obtained through the following two methods:The micro-seismic monitoring was performed on the fractures in 11 layers,and the monitoring data of crack orientation,seam length and seam height were obtained.Under the influence of the regional stress field,the fracture orientation has a good correlation with the main control structure.Under the condition of locally complex stress field,the fracture orientation changes greatly.The average wing length is 64 meters.Using the opportunity of coal mining back to CBM wells,downhole field observation of proppant distribution patterns.The main fracture orientation of well XS-10 is 87°,which is close to the actual measured joint direction.The east half-sew length with effective support is 24.35 m.In the existing development scheme,the effective fracture and well spacing do not match,and the crack penetration ratio is too small,affecting single well production and recovery.There is a good correlation between the fracture orientation and the tectonic trend.In the development of coalbed methane,the stress field and structural shape should be fully considered,and the well layout and fracturing construction parameters should be optimized.