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...

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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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Beschreibung
Zusammenfassung:	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 include an integrated safety system adapted to prevent damage to the tubulars while making and breaking out connections between the tubulars and the tubular string.