ACTUATOR FOR DUAL DRILL STRING VALVE AND DRILL STRING VALVE CONFIGURATIONS THEREFOR

A dual drill string actuator includes a piston disposed in a housing. The housing is configured to sealingly couple at its longitudinal ends to an end of a nested dual drill string segment. An upper internal conduit is mounted in the housing proximate one longitudinal end thereof. A lower internal c...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ALHAUG, ESPEN, MEINSETH, STEIN ERIK
Format:	Patent
Sprache:	eng ; fre ; ger
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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