Double-channel water path independent shunting controllable cave forming device

The utility model relates to a double-channel waterway independent shunting controllable hole-making device, which comprises a double-wall drill rod joint, an inner pipe, a piston, an outer shell, a blade, a catcher and a drill bit, the front end of the double-wall drill rod joint is connected to th...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	YANG HUWEI, XIAO FUGANG, XU RUI, CHANG HONG, DU LONG, GAO XIAOLIANG, WANG CHUANLIU
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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