Drag for sand instrument in pit

The utility model provides a drag for sand instrument in pit, the last check valve that connects gradually including top -down, plunger pump, storage sandpipe, down the check valve, shovel the head. The plunger pump includes the urceolus and sets up at the inside interior plunger of urceolus, interi...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	SONG QINGXIN, SUN XIUZHAO, LI CHANGYOU, LIANG WEI, XU XIA, JIA WEIXIA, ZHANG CHUANTING, KANG JIE
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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