Apparatus for gripping a tubular on a drilling rig
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United States of America Patent
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Jan 25, 2011
Issued Date -
N/A
app pub date -
Dec 12, 2006
filing date -
Mar 5, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
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.
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