Oil platforms are piled and anchored permanently to the seabed. They are not movable objects. Rigs are completely self contained and mobile units. A drill ship even has its own motor and propeller; whereas jack-ups and semi-subs need to be towed to location (fixed by GPS) by powerful tugs (Smit Lloyd). In Nigeria swamp barges and land rigs are more common.
Saturday, July 23, 2005
Trident 1
The Trident 1 is a jack-up rig. The legs are raised high for towing by tug boats to location where the 3 anchors from each corner keep it on location until the steel legs are lowered to the sea bed. The vessel is raised slowly above the water to an air gap of 25 feet. Normal drilling position is as shown here.
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