Antireflection technology of hydraulic fracturing of low permeability and gassy coal seam in complex tectonic belt

In order to understand the transformation and antireflection effect of surface vertical well antireflection technology of hydraulic fracturing on low permeability and gassy outburst coal seam in complex tectonic belt in Yangquan mining area, 9 coalbed methane wells were arranged near the faults in the study area, and surface vertical well hydraulic fracturing technology was used to fracture and antireflection improvement of No.3, No.8 and No.15 main mining coal seams. The results show that after the transformation of surface vertical well antireflection technology of hydraulic fracturing, the coalbed methane wells located near the closed reverse fault tectonic belt and the scour zone controlled by syncline structure can achieve higher gas production, and the development effect is good. The high permeability zone formed by fracturing is communicated with the high permeability zone formed near the fault, which significantly improves the effective gas extraction range and effect of coalbed methane wells, and reduces the outburst risk of mining roadway.