1. 
   jack-up rig
   (from the article `petroleum production`) Fixed platforms, which rest on the seafloor, are very stable, although they cannot drill in water as deep as floating platforms can. The most popular ...
   Found op http://www.britannica.com/eb/a-z/j/1
   
   
2. 
   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 ...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   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 ...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   Jackup rig
   A jack-up rig is a type of mobile platform that is able to stand still on the sea floor, resting on a number of supporting legs. The most popular designs use 3 independent legs, although some jackups have 4 legs or more. On "mat-type" jackups the legs are connected to a submerged hull. ==Operation=...
   Found op http://en.wikipedia.org/wiki/Jackup_rig
   
   

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