Study and Application of Hole Sealing Technology in the Special Geological Conditions

Aiming at the special geological conditions such as coal seam soft,rock crack development at roof and floor,the adjacent coal seam existing,and so on,the quality of drilling and hole sealing was poor and the phenomenon of air leak was serious which caused pressure measurement failure and gas drainage concentration and flow rate lower.To these problems,double polyurethane-pressure slime hole sealing method was applied which improved the hole sealing technology and effectively sealed surrounding rock fracture and improved hole sealing quality.Contrast test was performed in Beichen coal mine of Donghua group company.The results showed that the original coal seam gas pressure could be truly measured by using the new hole sealing technology which effectively improved the gas drainage concentration and flow rate and ensured safety production in coal mine.