The coal seams in the Shizhuang block of the Qinshui Basin are characterized by developed cleats

low permeability

soft coal structures

and strong heterogeneity. In earlier development stages

hydraulic segmented fracturing of horizontal wells resulted in significant variations in gas production per well

with unclear relationships between gas well productivity and fracturing parameters. This led to poor economic performance in coalbed methane（CBM） development

highlighting the need for optimization of horizontal well fracturing parameters. This study established a comprehensive fracability index（CFI） evaluation model based on coal seam brittleness

in-situ stress

and reservoir-seepage characteristics. Considering the impact of stress shadows during horizontal well fracturing

stress shadow and fracture interference charts were generated for different coal seam structures

clarifying the effects of net pressure

fracture length

spacing

and cluster number on induced stress. Based on the economic requirements for CBM development

the fracturing positions and segment design parameters of horizontal wells with different CFI values were optimized by considering the relationship between the internal rate of return (IRR) of single-well investment and daily gas production. A high-efficiency fracturing technology chart for horizontal wells was developed

aimed at improving the fracturing effectiveness in the Shizhuang block of Qinshui Basin and enhancing the quality and efficiency of CBM exploration and development.