Water stop device for layered water pumping of hydrogeological drilling

The utility model discloses a waterstop for hydrogeological drilling layered water pumping, which comprises an inner cylinder and an outer cylinder, the inner cylinder is movably connected inside the outer cylinder, the top end of the inner cylinder is provided with a connecting port, and the bottom...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	YANG CHONGJING
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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