Underwater simultaneous casing hole forming method

The invention provides an underwater simultaneous casing hole forming method which comprises the following steps of: performing drilling in an underwater filling body by using an off-balance bit of ahigh wind pressure down-the-hole drill and a steel casing, continuing drilling to a designed elevatio...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	HUANG WANLIN, TU SHENG, WANG WANGHONG, LIU YE, XUE LIANFU, SHI GUODONG, LIN WENBIN, TIAN JUFU, LI LIANG
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
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