Combined tapered mill for descaling and drifting

The utility model relates to an oil field well repair tool, namely, a combined tapered mill for descaling and drifting. The combined tapered mill comprises a pipe body, wherein a joint buckle connected with a pipe column is arranged at the upper end of the pipe body, four or five scraping alloy pavi...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	YAO YOUGUO, MA WEIYI, JIANG FUWANG
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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