Drilling Rigs - Semi-Submersible
A Semi-submersible platform or rig, is a mobile structure used for drilling for oil and natural gas in offshore environments. Their superstructures are supported by columns sitting on hulls or pontoons which are ballasted below the water surface. They provide excellent stability in rough, deep seas. Semi-submersible rigs can be moved from place to place; and can be ballasted up or down by altering the amount of flooding in buoyancy tanks; they are generally anchored by cable anchors during drilling operations, though they can also be kept in place by dynamic positioning. Semi-submersibles can be used in depths from 600 up to 35,000 feet (180 to more than 10,600 m).
Launching of Seadrill's West Phoenix at Geoje, South Korea, Aug 2007
In dock at Stavanger for annual inspection
Leaving Invergordon following annual inspection this taken from deck of the Stadrill (hull No. Sedco...
Hull number SEDCO702 on long term lease to Shell and named Stadrill.
Crewed by Shell Drill Crew. Wa...
A logo of the Sedco 700 there was rather a rude name for this Whale and what it was doing the W*****...
The press reception for the new Treasure Finder this picture was taken by Harry Scott then in his 70...
The old personnel basket in use Stavanger Norway whilst the Sedco 700 was undergoing inspection and ...
Taken from the Rig Express bridge, kind thanks to her skipper.