| abstract |
The invention belongs to the technical field of drilling and sealing, and provides a method for drilling and sealing coal seam gas drainage based on MICP technology. A closed space is formed inside the borehole by filling the sealing material, and the high-concentration gas in the initial borehole is extracted by using the drainage pipeline. Reduce; by injecting nutrient solution into the area, activating microbial spores, reacting to generate a large amount of carbonate with cementation effect, repairing the new cracks, and then increasing the concentration of gas drainage; when the gas concentration decreases greatly, by injecting microorganisms again The slurry can quickly repair the fracture network, block the leaking channels, and increase the drainage concentration again. The invention can effectively block the gas leakage channel in the gas drainage process, solve the problem that the new cracks are difficult to block in the gas drainage process, can greatly improve the gas concentration in the drainage hole, and prolong the service time of the coal seam gas drainage hole . |