Method for pumping gas of protected layer by layer penetration and hole drilling on high-position drilling fields of protecting layer machinery tunnel

• Main Authors: LU SHOUQING, ZHANG RAN, CHENG YUANPING, JIN KAN, WANG LIANG, AN FENGHUA
• Format: Patent
• Language: Chinese; English
• Published: 18.06.2014
• 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