Wells – Above ground apparatus – With means facilitating connecting or disconnecting...
Reexamination Certificate
2011-01-25
2011-01-25
Dang, Hoang (Department: 3672)
Wells
Above ground apparatus
With means facilitating connecting or disconnecting...
C166S075140
Reexamination Certificate
active
07874352
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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Boutwell, Jr. Doyle Frederic
Giroux Richard Lee
Hayes Michael
Heidecke Karsten
Le Tuong Thanh
Dang Hoang
Patterson & Sheridan LLP
Weatherford / Lamb, Inc.
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