Hydraulic Control of Downhole Tools

A well tool apparatus comprises a control arrangement configured to control response of the downhole tool by varying a bore-annulus pressure difference. The control arrangement includes a valve piston longitudinally slidable in a generally tubular controller housing that is in operation substantiall...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Evans John Gerard, Dunbar Bradley David, Lassoie Jean-Pierre, Bradford William Browning, Cawthon David Wayne
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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