Apparatus for gripping a tubular on a drilling rig

Methods and apparatus for running tubulars into and out of a wellbore. A gripping apparatus is activated with an actuator having a primary actuator and a redundant safety feature. The redundant safety feature may include one or more redundant fluid operated pistons. The gripping apparatus may includ...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	BOUTWELL, JR., DOYLE FREDERIC, GIROUX, RICHARD LEE, PIETRAS, BERND-GEORG, HEIDECKE, KARSTEN, LORENZ, JOERG, ODELL, II, ALBERT C, HAYES, MICHAEL, LE, TUONG THANH, THOMPSON, GARY
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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