Novel inner hole protection combination device for hanger

The utility model discloses a novel inner hole protection combination device for a hanger, which relates to the field of machining and comprises a lining protection sleeve. After the inner control of the hanger is processed, the lining protective sleeve is pushed to a corresponding position, then th...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	LIU YUCHEN, FENG LIN, WEI WENYANG
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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