Method for drilling and sealing holes through high-pressure water injection under coal mine

• Main Authors: XU SHENGCHI, LU YUGUO, WU YUANLIANG, SUN XUEHUI, KONG XIANDE, SHENG JIQUAN, SUN PENG, LU HUIPING, LI SONGLIN
• Format: Patent
• Language: Chinese; English
• Published: 18.11.2009
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention discloses a method for drilling and sealing holes through high-pressure water injection under a coal mine. The method comprises the following steps: drilling a borehole on a coal body first, wherein the depth of the borehole is between 10 and 15 meters and the bore diameter phi is 89 millimeters; continuously drilling a borehole of which the bore diameter phi is 42 millimeters inwards in the borehole of which the bore diameter phi is 89 millimeters; inserting a hole sealing sleeve into the borehole of which the bore diameter phi is 89 millimeters, wherein the hole sealing sleeve adapts to the length of the borehole of which the bore diameter phi is 89 millimeters, the wall of the sleeve is provided with a plurality of small holes, and polyurethane is used for sealing the holes at the orifices of the holes; and inserting a water injection pipe into the hole sealing sleeve, and injecting Mali powder into the hole sealing sleeve to seal the holes. The packing material can reach the strength after 1