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jack board a device used to support the end of a length of pipe while another length is being screwed on
jackup a jackup drilling rig.
jackup drilling rig a mobile bottom-supported offshore drilling structure with columnar or open-truss legs that support the deck and hull.  When positioned over the drilling site, the bottoms of the legs rest on the seafloor.  A jackup rig is towed or propelled to a location with its legs up.  Once the legs are firmly positioned on the bottom, the deck and hull height are adjusted and leveled.   Also called self-elevating drilling unit.  See bottom-supported offshore drilling rig.
joint a single length (30 feet or 9 meters) of drill pipe, drill collar, casing, or tubing that has threaded connections at both ends.   Several joints screwed together constitute a stand of pipe.

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Last Updated: 09/17/2010, 05:07 PM