Safety release sub

The utility model relates to a safety releasing sub which comprises an upper sub (1), a releasing cylinder (2), an outer cylinder (4) and a limiting piston (3) which are distributed up and down, and first key groove limiting structures which are inserted up and down and are in rotation stopping fit...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHANG YUGUI, BIAN JIANG, ZHU ZIHENG, WANG SUWEN, CHAO KAI, YAN XIAXIA
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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