Research on Electrochemical Composite Energy Fracturing Coal Seam Gas Treatment Technology

Abstract

Using the 2608 transportation roadway of Zhangcun Coal Mine in Lu'an Mining Area as the engineering background, this study compared the differences between gas extraction using electrochemical composite energy pulse fracturing technology and conventional methods. Experimental results showed that after coal seam permeability enhancement treatment, both gas concentration in fracturing holes and auxiliary extraction holes within the affected zone increased significantly. The gas extraction concentration in treated areas reached up to three times higher than that in untreated original extraction holes, with the optimal fracturing influence radius being approximately 5.0~7.5m. Field gas extraction results demonstrated that electrochemical composite energy fracturing effectively modifies multi-scale pore-fracture structures in coal seams, facilitating gas desorption, diffusion, and migration. The gas permeability enhancement and extraction mechanism of electrochemical composite energy fracturing may involve: When shock stress waves penetrate coal seams, they generate stress at both ends of existing fractures, expanding their length and width while creating new fractures. Simultaneously, the stress induces tensile damage to coal matrix particles, causing fracture propagation. This process connects new fractures with existing ones, forming a complex fracture network that enhances gas migration and production capacity.