WELLHEAD ASSEMBLY AND METHOD FOR AN INJECTION TUBING STRING

A wellhead assembly (10) for an injection tubing string is provided which allows a master valve to be closed without damaging the injection tubing si ring while still allowing for the use of a back pressure valve to isolate th e tree. Wellhead assemblies and related methods of the present invention...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	HILL, THOMAS G., JR, BOLDING, JEFFREY L, COLE, BLANE
Format:	Patent
Sprache:	eng ; fre
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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