Research on influencing factors and remedial measures of coal seam water blocking effect

Coalbed methane development primarily relies on hydraulic fracturing and drainage gas extraction processes. The intrusion of external fluids long-term contribute to the water blocking effect, which becomes one crucial factors affecting production capacity. In this study, coal reservoir a certain coalbed in Hancheng, Shaanxi Province, was selected as research object. experimental method employed comprehensively evaluate correlation between such sample moisture content, permeability, porosity, properties liquids, damage. results indicated that there positive liquid surface tension, On other hand, pore permeability characteristics, contact angle with rock samples, damage showed negative correlation. Building upon aforementioned research, an investigation into remedial measures for conducted. Additionally, chemical treatment study using compound surfactant system JSS-1 water-blocking agent performed manage effect. demonstrated significantly reduced tension wellbore fluid improved its wetting behavior coal-rock surface. laboratory experiments confirmed capability managing