Blowout prevention back pressure device for water exploration and drainage

The utility model discloses a water exploration and drainage blowout prevention back pressure device which comprises a drill rod, a sleeve is arranged outside the drill rod in a sleeved mode, a sealing blowout prevention device is arranged inside the sleeve, a branch pipe is connected outside the sl...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	YANG XIFENG, SUN XIAO, FANG QIUFENG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	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
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