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.
Platform rigs are less common because of higher drilling costs due to larger size platform required. Shown here is a supply vessel being unloaded.
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