Jack-Up Rig

These rigs are normally towed on location, but a few are self-propelled.  They are composed of an upper deck supported by either three or more legs attached to mats or spud cans and are capable of working in water depths from 30 to 350 feet.  These mats or cans rest on the ocean floor with the deck jacked up into drilling position.  There are two common types of  jack-up rigs; Bethlehem and Letourneau.  The former uses stabilized column legs attached to mats while the latter uses three, truss-type legs mounted on spudcans

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