COAL PERMEATION-WETTING EXPERIMENT SYSTEM BASED ON SOLUTION IN-SITU PRESSURE INJECTION

The invention discloses a coal permeation-wetting experiment system based on solution in-situ pressure injection, belonging to the field of coalbed methane/coal seam gas extraction. The experiment system is implemented by the following steps: a coal sample is pushed into a high-pressure chamber; a stress loading and control device is used to perform three-dimensional pressurization; a gas injection device is used to perform gas adsorption on the coal sample; a temperature control device is used to heat the coal sample and a gas and control temperatures; an in-situ pressure injection device is used to inject a liquid into the coal sample; an acoustic emission device is used to monitor damage, crack initiation and propagation, and distribution characteristics of coal; and a data acquisition and control device is used to record parameters such as three-dimensional stress, gas pressures, water injection pressures and temperatures during testing. Test results of the system can provide theoretical and scientific basis for pressure injection of a solution into coal seams to increase permeability and enhance wettability, which improves a coal seam gas extraction rate and a dust control effect and is of great significance for safe and efficient mining of deep coal seams and occupational health.