Method for coal seam gas seepage displacement, seepage water locking and dust reduction

A method for coal seam gas seepage displacement, seepage water locking and dust reduction, comprising the following steps:

• S1. Coal seam occurrence analysis:
• drilling liquid injection boreholes and boundary control boreholes based on occurrences of coal seams, and recording parameters;
• wherein the liquid injection boreholes are configured for injecting micro-nano bubble surface active liquid coupling medium, and the boundary control boreholes is used for controlling gas flow and discharge direction;
• S2. Preparation of liquid gas coupling medium:
• adding a surfactant and water into a preparation container to obtain a surfactant aqueous solution, cyclically extracting and discharging the surfactant aqueous solution through a micro-nano bubble generator, and converting a gas into micro-nano bubbles through a micro-nano bubble nozzle for mixing into the surfactant aqueous solution for coupling, thereby obtaining a micro-nano bubble surface active liquid coupling medium;
• S3. Seepage displacement:
• using a pressure pump and a pumping system, injecting the micro-nano bubble surface active liquid coupling medium in step S2 into the coal seams through the liquid injection boreholes to perform seepage displacement of coal seam gas, achieving coal seam gas discharge or extraction;
• S4. Seepage water locking:
• storing the micro-nano bubble surface active liquid coupling medium described in step S3 in the coal seams, thereby performing seepage water locking to the coal seams to realize the desorption speed suppression and emission intensity reduction of the coal seam gas;
• and
• S5. Dust reduction:
• when the micro-nano bubble surface active liquid coupling medium described in step S3 is stored in the coal seams, moistening the coal seams to achieve a reversal of coal seam wetting and increasing a water content.