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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).
Noble Ton Van Langeveld. Undergoing maintenance at Invergordon, Scotland.
GSF Arctic II. At berth in the Cromarty Firth, Scotland.
Noble Ton Van Langeveld. Undergoing maintenance at Invergordon, Scotland.
GSF Arctic II GSF Arctic II at berth in the Cromarty Firth.
Sovereign Explorer Translation from the Brazilian Portuguese: "Sovereign Explorer, installed in a basin between the cit...
Sovereign Explorer The launch of the "Sovereign Explorer" built at Cammell Laird shipyard, Birkenhead, Merseyside.
Atwood Southern Cross Atwood Southern Cross in the Black Sea April 2008
Noble Clyde Boudreaux The Noble Clyde Boudreaux semisubmersible drilling rig was refurbished in Mississippi and then trave...
Maersk Developer The highly advanced deepwater development semi-submersible is capable of drilling at water depths do...
Kantan 3 Kantan 3, of Sinopec, China.

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