Research on Acidizing Fracturing Based on Matrix - Fracture Interaction Permeability Model of Coal Seam

Abstract

With the normalization of deep mining, scientific challenges are increasingly complex, particularly in managing and mining deep high-gas mines. For safe and efficient operations, gas treatment is essential before coal extraction to reduce gas content and pressure to safety standards. By quantifying coal's structural characteristics and understanding gas migration behavior, the mechanisms behind increased permeability is explored. To quantify the impact of gas adsorption on crack deformation, we define an internal expansion coefficient that represents the ratio of crack deformation due to gas adsorption relative to matrix deformation. It is analyzed that crack growth is influenced by principal stress magnitude and direction. Through quantitative characterization of coal structure, we analyze gas migration characteristics within it and investigate how strong oxidizing agents enhance oxidation yield. Based on the ternary coal industry's engineering context, we conduct a technology process analysis and verify application effects for acidizing combined with fracturing stimulation techniques.