In view of the limitations of single enhanced permeability gas extraction,in order to improve the efficiency of gas extraction,an alternate gas-water displacement test was conducted in the bottom pumping roadway 21603 of a high-gas coal mine.Based on the conditions of the implementation area,the gas-water mixed pressure drilling design was carried out to test the residual gas pressure and content after gas injection,and the corresponding data of the original gas in the experiment area were compared.The variation of gas ex-traction flow rate and volume fraction with time was also monitored.The results show that in the gas extraction project,the gas-water al-ternating displacement technology can fully reduce the residual gas content and pressure in the coal seam,and the gas extraction mixed amount increases greatly.Compared with the gas extraction net amount of the adjacent driving face with the single water pressure en-hanced reflection,the gas extraction net amount increases significantly.The gas-water mixed pressure enhanced gas extraction project can improve the construction quality and efficiency,ensure the construction safety,and finally achieve the purpose of saving costs and shortening the construction period.
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