Coal seam gas reinforced extraction method for hydraulically-driven circumferential cracking coal body

• Main Authors: SHEN KAI, YANG LIANG, HAN CHENGQIANG, CHENG BO, HUANG RUIFENG, DONG CHUNYANG, LIU YONGLIANG, DAI LINCHAO, ZHANG XIAOYU, ZHANG YANGQIANG
• Format: Patent
• Language: Chinese; English
• Published: 13.12.2022
• 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 a coal seam gas reinforced extraction method for hydraulically driving a circumferential fracturing coal body, and belongs to the field of coal mine safety. High-pressure water is injected into a multidirectional oil cylinder through a high-pressure water injection pump or a pump set in an underground coal mine, and then an acting column and a fracturing arc are pushed to move in the radial direction of a gas extraction drill hole; and after the multi-directional oil cylinder is in contact with the inner wall of the gas extraction drill hole, water pressure in the multi-directional oil cylinder extrudes a coal body around the gas extraction drill hole, so that the coal body generates secondary fractures of different degrees, the purpose of coal seam permeability increasing is achieved, finally, the fluidity of gas in the coal body around the gas extraction drill hole is improved, and the gas extraction effect is enhanced. 本发明涉及一种液压驱动环向致裂煤体的煤层瓦斯强化抽采方法，属于煤矿安全领域，本发明通过煤矿井下的高压注水泵或泵组将高压水注入至