DOWNHOLE TOOL CONTROL

A method of operating a downhole tool in a no-flow configuration in which a piston and a flow-restriction cooperate to occlude a tool throughbore. The tool is reconfigured to an intermediate configuration by flowing fluid through the tool at an intermediate flow-rate lower than an operating flow-rat...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	EDDISON ALAN MARTYN
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 method of operating a downhole tool in a no-flow configuration in which a piston and a flow-restriction cooperate to occlude a tool throughbore. The tool is reconfigured to an intermediate configuration by flowing fluid through the tool at an intermediate flow-rate lower than an operating flow-rate and axially translating the piston to an intermediate position in which the piston and flow-restriction cooperate to define an intermediate flow area. Axial translation of the piston between a no-flow position and the intermediate position includes an occlusional stage of a first axial extent during which the piston and the flow-restriction occlude the tool throughbore, and a transitional stage of a second axial extent during which the piston and the flow-restriction cooperate to provide a step-change in flow area. The tool is reconfigured to an operating configuration by flowing fluid through the tool at the operating flow-rate and axially translating the piston.