Near-distance coal seam group goaf leaking stoppage drilling method
The invention provides a short-distance coal seam group goaf leaking stoppage drilling method. The method comprises the steps that the hole wall surrounding rock disturbance influence range of a drilled hole is determined based on the loosening circle theory; through a slurry injection test, the dia...
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| creator | QU GUOWEN LYU TINGMIN DENG WEINAN HOU JINGMIN WANG FUCHENG GAO CHAO YIN XIWEN WU JUNFEI WANG QIANG ZHANG KAI LI JIJUN LI WEI TIAN GUOCAN WANG LIBING LI GUOZHI |
| description | The invention provides a short-distance coal seam group goaf leaking stoppage drilling method. The method comprises the steps that the hole wall surrounding rock disturbance influence range of a drilled hole is determined based on the loosening circle theory; through a slurry injection test, the diameter of an injection nozzle, the slurry concentration, the slurry granularity, the pressure of a grouting pump and the slurry consumption corresponding to slurry injection in a drill hole are determined, so that the slurry injection range reaches the hole wall surrounding rock disturbance influence range; slurry is prepared according to test results, the pressure of a grouting pump is adjusted, and a jet nozzle with a special jet nozzle diameter is arranged on a drill bit; in the process that the drill bit is used for drilling, the grouting pump capable of adjusting the grouting pressure is used for controlling grout to be jetted into the goaf and the fractured rock mass through the jet nozzle, and after a stable |
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| 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 |
| title | Near-distance coal seam group goaf leaking stoppage drilling method |
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