Research on interface modification and long-term sealing properties of bentonite-based sealing materials
Aiming at the technical problems of low average concentration and short duration of gas extraction in coal mine and the field requirements obtained from engineering practice,interface modification methods such as mechanical modification method and organic activation modification method were selected,and bentonite was used as the base material to improve water retention,stability and thixotropy,and a liquid phase sealing materials for gas drilling were developed.The idea of"liquid sealing gas"is adopted to realize full-cycle thixotropic sealing of nascent cracks.The application results of Renlou Coal Mine show that,the new material has good sealing effect,and the average extraction concentration is 41.66%,which is 15.27 percentage points higher than that of the traditional material;the concentration attenuation coefficient is decreased by 48%,slurry lifting coefficient is increased by 22%,which indicating the material can realize waste hole utilization.
gas extractionboreholes sealingbentonitesurface modification
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