A hole opener

A hole opener or reamer (10) for use downhole, comprises an opener body (12) which has a retention assembly (14) coupled therewith to retain a cutter (16) relative to the opener body. The retention assembly includes a retention member (18) that is engaged with the cutter, a securing member (22) to s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	ALAN MACKENZIE
Format:	Patent
Sprache:	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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Beschreibung
Zusammenfassung:	A hole opener or reamer (10) for use downhole, comprises an opener body (12) which has a retention assembly (14) coupled therewith to retain a cutter (16) relative to the opener body. The retention assembly includes a retention member (18) that is engaged with the cutter, a securing member (22) to secure the retention member relative to the opener body, and a bridging member (24) that is fixedly secured to the opener body to lie between the securing member and the opener body. The bridging member and the securing member have substantially the same thermal expansion characteristics which differ from those of the opener body. The retention and securing member may be integrally formed, and the bridging member may be welded to the opener body, and the securing member may be welded to the bridging member. There may also be a locking chamber (28, figure 4) and locking member 36.