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.
This photo was taken during well test on the semi-sub Margie in 1976. I was working as a wireline operator. Bob Carrol was my completions supervisor. Behind me is a Sikorsky helicopter on a regular crew change flight.
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