Apparatus for testing oil wells

An annulus pressure operated oil well testing and sampling apparatus utilizes hydrostatic pressue to supplement spring means which biases against valve means to hold the valve means closed until application of sufficient hydraulic pressure to the annular fluid opens the tool to the formation and all...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	WRAY, GARY Q, HOLDEN, JOHN C
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:	An annulus pressure operated oil well testing and sampling apparatus utilizes hydrostatic pressue to supplement spring means which biases against valve means to hold the valve means closed until application of sufficient hydraulic pressure to the annular fluid opens the tool to the formation and allows testing operations to be performed. A subsequent intentional or inadvertent release or sudden extreme increase of applied pressure on the annular fluid actuates means to close the valve means against further formation fluid flow.