Continuous dynamic sealing device for gas extraction drill hole and using method

• Main Authors: LI DEBO, LI CHAO, CHEN LONG, ZHU LICHENG, YE ZHENGLIANG, ZHAO GANG, ZHENG ZHONGYOU, GONG XUANPING
• Format: Patent
• Language: Chinese; English
• Published: 05.08.2022
• 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 relates to the technical field of mine gas prevention and control, and provides a gas extraction drill hole continuous dynamic sealing device and a using method.The hole sealing device is arranged in a drill hole of a coal seam and comprises a plurality of bag units, a first grouting pipe, a second grouting pipe and a gas extraction pipe; the multiple bag units are sequentially arranged along the hole length of the drill hole, the hole sealing sections are formed between the adjacent bag units, the sealing performance in the drill hole is improved, the first grouting pipe conducts grouting on the multiple bag units and the hole sealing sections on the outermost side in the drill hole, one-time hole sealing is formed, and the hole sealing efficiency is improved. Grouting is carried out in the hole sealing section on the innermost side in the drill hole through the second grouting pipe, secondary hole sealing is formed, the phenomenon that the gas extraction effect is poor due to gas leakage of th