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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).
Wil Phoenix With the PSV Olympic Electra in the Cromarty Firth today 26.2.12.
Ocean Guardian Back in the Cromarty Firth after her trip to the Falklands.
rig @ singapore Rig picture taken on 26-02-2012,at Singapore break waters.
West Leo West Leo on standby at Singapore anchorage, on 22-01-2012.
Jack Bates N.W. Shelf Australia, taken after arriving from Shipyard in Singapore.
Transocean Prospect Alongside the Service Base at Invergordon 19.5.12
Treasure Hunter in a Storm Whilst pulled off the Brent Charlie.
West Aquarius DSME yard, July 2008
West Sirius GOM, June 2008
Landing on T.Hunter One of the nicest nights on an offshore platform

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