Technology and Practice of Sealing Holes for Gas Extraction in Coal Seam with Low Permeability
2105 working face of Jiuxin Coal Industry Co.,Ltd.is a soft coal seam,the coal seam has poor permeability,the gas extraction borehole is difficult to seal,and the gas leakage is serious in the late drilling period.In view of this situation,an integrated sealing and plugging device was developed to implement the sealing process,which has the dual functions of grouting sealing and gas leakage sealing.The practical application results show that the average gas volume fraction increased from 19.1%to 41.1%during 0-100 d of drilling,and the average gas volume fraction increased to 50.2%after 30 d of gas leakage disposal.The sealing process can effectively solve the problem of gas leakage in the late sealing period of drilling,and effectively improve the volume fraction of gas extraction in the late drilling period.
low permeability coal seamgas extractionintegration of sealing and pluggingsealing and plugging device
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