ANNULAR SAFETY VALVE

An annular safety valve that is positionable in a wellbore may include a housing having an opening extending through the housing to allow to allow pressure to transmit between a first annular area of the wellbore below the annular safety valve and a second annular area of the wellbore above the annu...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Brown, Irvine Cardno, Taylor, Ronald George, Inglis, Peter Derek Walter, Davies, Katherine Ann
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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