Pressurized drilling device for drilling rod

The utility mode discloses a pressurized drilling device for a drilling rod, which comprises two half-type holding hoops mounted on the drilling rod. Each of two holding hoops is provided with an arc groove and the two holding hoops are connected with each other through a fastening piece, wherein on...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	HE BIN, ZENG HONG, LI XU, YANG SONG, SHI XITIAN, LING DAIYUAN
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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