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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).
The Ocean Nomad The Ocean Nomad
Visund Plaform, Norway September 2011
JW Mclean and Stena Spey You go on a holiday to Scotland, have a nosey along the Cromarty Firth and lo and behold there are t...
Cromarty Firth, October 2011 From far left - Ocean Princess, JW Mclean, Stena Spey and Galaxy 1. There is a semi-sub missing furt...
Ocean Princess Ocean Princess in dock at Invergordon. Taken October 2011.
Noble Driller Taken May 2011 Signal shipyard, Pascagoula MS. This is the old Kingsnorth UK, which has had various...
Eirik Raude Ocean Rig Frente a Halifax, Canada
Centenario GR Deep water Golfo de Mexico
PETRO RIG PETRO RIG = CENTENARIO
Transocean Driller Transocean Driller leaving Port of Rio after shipyard period. January 2010 Rio de Janeiro, Brazil. ...
Petrobras P56 Newly completed Petrobras 56 leaving shipyard. Brasfels, Angra dos Reis, Brazil, June 2011

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