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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).
Rig and Wave North Sea 2011
Sinking the Jacket The Thialf crane barge and Tamar jacket..bein deplyed sub sea from the barge Dec 2012 I have u...
The Borgsten Dolphin Doing stability tests at the entrance to the Cromarty Firth with the Tugs Loke Viking and Magne Viki...
Sedco 704 The Sedco 704 passing through The Sutors en route to the dry dock at Nigg accompanied by the tow ves...
Semac 1 at Karimun (Indonesia)
Sedco 704 refit The Sedco 704 has a new crown section lifted into place as part of a major refurbishment of the derr...
NTVL Arriving at Invergordon on 12th May,2013.
Sea Gem 1965 The Sea Gem of made the first breakthrough in what was to be Britain's principle energy resource int...
Transocean Legend off Brazil Drilling out from Vitorio in about 900 meters water, June 2001
Pride South Seas Taken Oct 27th 2007 during a holiday in South Africa. The sheer size is impressive; the rig towering...
SEDCO 704 Doing tests at the entrance to the Cromarty Firth 9.6.13
Scarabeo 7 Cape Town Nov/Dec 2008 My wife and I owned Jet Stream Plumbing who were tasked with our plumbers to...

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