Wells – Submerged well – Connection or disconnection of submerged members remotely...
Patent
1997-11-21
1999-08-31
Dang, Hoang C.
Wells
Submerged well
Connection or disconnection of submerged members remotely...
166 7514, 166382, E21B 33043
Patent
active
059441119
ABSTRACT:
An offshore well system has an assembly for tensioning an inner riser or casing string. The system has a hanger which lands on an internal load shoulder. The hanger has a gripping mechanism on its lower end which engages a mandrel, the mandrel being connected to tieback casing. The gripping mechanism allows upward moving of the mandrel relative to the hanger, but not downward movement. A running tool releasably engages an interior portion of the mandrel. A launch adapter secures to an upper end of the hanger. The launch adapter slidingly engages a running string which also extends upward through a blowout preventor. Closing the blowout preventor and applying pressure to the launch adapter causes it to move downward, pushing the hanger onto the load shoulder. Subsequently, the running tool is pulled upward to apply tension to the casing which is held by the griping mechanism. The running tool is retrieved along with the launch adapter. The load shoulder may be retractable to remove tension for retrieving the casing.
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ABB Vetco Gray Inc.
Bradley James E.
Dang Hoang C.
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