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).
Frigstad D90 Lower Hull at dockside ready for load out. November 15 2009. She's an ultra deepwater s...
COSL Pioneer docked at Yantai Raffles Shipyard China
The Sedco 714 in the Queens dock at Invergordon with the Borgsten Dolphin on the left.
Taken on the...
I remember this day well. Battered but unbowed. A remarkable old lady.
Moon and derrick
Super wide shot from the helideck of the Maersk Discoverer at first location off Karratha, Australia...
Alongside the AstiCan ship repair yard at Las Palmas on 29/11/2009, towards the end of a three month...
Pride South Seas
Picture was taken on 6 Feb 2010 from a sea kayak paddling back to Langebaan from Saldanha.
OCEAN PATRIOT in Portland, Victoria, Australia
14th January 2008
Photo of the rig Transocean Rather sitting in the middle of the entrance to the Cromarty Firth, take...
Photo of the vessel Bourbon Orca seemingly working on the anchors of the rig Transocean Rather, Crom...
North Sea Pioneer
North Sea Pioneer laying off Sekondi (Ghana)
Picture taken on 07-02-10