DOWNHOLE DRAG REDUCTION APPARATUS

A downhole drag reducing apparatus (18) comprises a mandrel (20) and a bearing sleeve (24) mounted on the mandrel (20), such that the mandrel (20) and bearing sleeve (24) are rotatable relative to each other. The bearing sleeve (24) defines a bore wall engaging surface. The apparatus (18) comprises...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	MOYES, Peter Barnes
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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