Abstract
For the purpose of improving the low coal seam permeability and overcoming the heavy workload, high cost, drainage concentration and poor effect of gas drainage on the 5917 working face of Longfeng Coal Mine, this paper applies the safe and efficient CO2 deep hole blasting permeability improvement technology in the experimental study of the object, examines the radius of influence of fracture-inducing hole, gas flow and other related parameters in the means of field test, lab test, etc., and conducts enhanced coal seam permeability improvement with CO2 fracturing technology. The resulting drill hole gas flow and pure flow of gas drainage are respectively 2.2-4.7 times and 5-12 times of the original values, indicating that the proposed method has significant effect on permeability improvement and high feasibility of enhancing efficiency and increasing production.
