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).
Maersk Asserter towing the Atwood Hunter off Ghana
to it's new location. Picture taken on 04-02-10
Atwood Hunter working off Ghana. Picture taken on 02-02-10
Photographed in the Cromarty Firth on 4th October 2009.
7 August 2009 - rig off Curacao during final mobilization stage, prior last leg of transit to GOM.
North sea 17.02.2010
Chopper coming in to land
Photo was taken on the Pride South Seas, on 6 October 2005, from the control room. Rig was under to...
Taken in May 2005, at dawn. Working for Murphy oil, offshore Malaysia
Queens Dock, Invergordon 16/10/09, getting ready for shipping to Falkland Island where she is curren...