Gas extraction method and system based on non-solidifying sealing material

A system for gas extraction based on a non-solidifying sealing material, comprising:

• a support assembly;
• a gas extraction pipe;
• a gas extraction device;
• a first sealing water bag;
• a second sealing water bag;
• a water injection and drainage device;
• a grouting device;
• a slurry discharge device;
• and
• a central control unit;
• wherein the support assembly is arranged at a middle of a sealing segment of a borehole;
• the support assembly comprises an outer support sleeve;
• a central tube is arranged along a central axis of the outer support sleeve;
• a plurality of support vertical plates are fixedly connected to an interior of the outer support sleeve;
• and those among the plurality of support vertical plates arranged between the outer support sleeve and an outer wall of the central tube are each provided with an engagement hole;
• the gas extraction pipe is configured to pass through the central tube, and is located at a center of the borehole;
• the gas extraction device is connected to a first end of the gas extraction pipe;
• the first sealing water bag is arranged at a front end of the support assembly, and the second sealing water bag is arranged at a rear end of the support assembly;
• the water injection and drainage device is connected to a water injection pipe;
• an end of the water injection pipe is connected to the first sealing water bag and the second sealing water bag;
• and the water injection pipe is provided with a first valve;
• the grouting device is connected to a grouting pipe extending into the sealing segment;
• and the grouting pipe is provided with a pressure valve;
• the slurry discharge device is connected to a slurry discharge pipe extending into the sealing segment;
• and the slurry discharge pipe is provided with a second valve;
• and
• the central control unit is electrically connected to the water injection and drainage device, the gas extraction device, the grouting device, the slurry discharge device, the first valve, the pressure valve and the second valve, and is configured to control the water injection and drainage device, the gas extraction device, the grouting device, the slurry discharge device, the first valve, the pressure valve and the second valve.