Sand prevention plugging device

The invention relates to the technical field of wellhead blowout preventers, in particular to a sand prevention plugging device which comprises an upper connector, a lower pipe assembly, an inner push rod and a drill bit, the lower pipe assembly is formed by splicing three inner connecting pipes, ea...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	BIAN DINGWANG, LIU SHUJUN, ZHU JIADAO, BIAN CHANGRONG, WANG GUOHUA
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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