Patent ID: 6926097
Filing Date: 2005-08-09
Classification: E02B,E21B

Abstract:
1. A jack-up workover rig configured to operate in a water body having a surface and a bed, said workover rig comprising: a vessel comprising a hull, a deck having an outer perimeter, and a thrust source configured to propel said vessel through said water body; a jack-up mechanism comprising a plurality of extensible legs, each said leg having a foot end, said jack-up mechanism further comprising at least one jack-up motor configured to raise and lower said legs, whereby said vessel may be raised above the surface of the water body by continuing to extend said legs after said foot ends of said legs reach the bed of the water body; an extensible cantilevered frame mounted to said vessel; at least one frame drive configured to extend and retract said cantilevered frame in a direction generally perpendicular to said legs; a workover floor unit comprising a work platform having a well aperture, drawworks, a derrick, a cable, a workover motor, an accumulator unit, and a choke manifold, said workover floor unit releasably mounted to said cantilevered frame whereby said workover floor unit may be extended past said perimeter of said vessel deck up to a first distance by extending said cantilevered frame; and a crane positioned on said vessel and configured to lift said workover floor unit from said cantilevered frame, said crane further configured to extend said workover floor unit beyond said first distance from said perimeter of said vessel deck.