Large-drift-diameter secondary hole sealing device for gas extraction drill hole

• Main Authors: CHEN YONG, KANG JIANNING, LI XIAOMING, HU LIANGZHAO, LI YONGYUAN, MIAO FATIAN, MA YANYANG, ZHOU WENBIN, YANG TENG, FENG RENJUN, WANG YILONG, WU JIAOKUN, SHI MINGFU, SUN FULONG, ZHAO QINGQUAN, MA HONGYU, LI WEIDONG, LI ZHENGNAN
• Format: Patent
• Language: Chinese; English
• Published: 19.11.2021
• 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

The utility model relates to a large-drift-diameter secondary hole sealing device for a gas extraction drill hole, and belongs to the technical field of gas control engineering. Comprising two hole sealing units and a hole sealing pipe, the end, arranged in a drill hole, of the hole sealing pipe is an air inlet end, the number of the hole sealing units is two, the two hole sealing units are arranged in the drill hole between the air inlet end and a drill hole outlet, the two hole sealing units are sequentially arranged in the extending direction of the drill hole, and the outer diameter of the hole sealing pipe is larger than or equal to 50 mm. According to the utility model, the sectional area of a gas flow channel can be increased during hole pre-drainage, and the gas flow resistance is reduced; secondary hole sealing is carried out in the continuous extraction period of the drill hole, continuous sealed extraction of the drill hole is kept, and the extraction efficiency and the life cycle of the drill hole