含水碎软煤层气动定向钻进关键技术及工程应用

刘 飞
Key Technology of Air Directional Drilling for Brokened-Soft Coal Seam Under Water-Inrush Condition in Underground Coal Mine
煤炭工程 . 2026, (6): 104 -110 .  DOI: 10.11799/ce202606014