Experimental Study on the Improvement of Coal Seam Gas Extraction Rate Based on Inorganic Nano-sealing Materials
To address the problem of low gas extraction rate and limited life span of the borehole due to fissures caused by the use of traditional materials to seal the borehole,the air leakage pathways and stress distribution around the extraction borehole were analyzed to determine the main areas of air leakage in the borehole;an inorganic nano-oxide was added to the silicate inorganic ma-terial to modify it,and an inorganic nano-hole sealing material was obtained which can retain water for a long time and does not so-lidify or shrink.Based on the 53032 roadway of Shanxi Zhulinshan Coal Industry Co.,Ltd.,the test was carried out to seal the hole in the down-hole and subsequent slurry sealing.The results showed that the average gas extraction concentration of the test group was better than that of the control group.After 16 days of sealing,the average pure gas extraction volume of the test group ranged from 0.04 to 0.06 m3/min,while the average pure gas extraction volume of the control group ranged from 0.02 to 0.04 m3/min,and the sealing quality of the test group is better than that of the control borehole.The average gas extraction concentration of the test group increased by 20%after slurry sealing,and slurry sealing can improve the sealing quality of the borehole and the average con-centration of gas extraction.
gas extractionnon-condensable sealing materialsair leakage passagespatching and sealing of holesextraction concentration
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