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).
Songa Mercur, Cua Lo Field Vietnam, drill for ENI. Taken 18 December 2013
On location ~20 July 1972.
Successfully drilled what is now the Thistle Field.
I believe she migh...
20 August 2004 about 80nm NW of Stornoway en route from Newfoundland to UK waters.
Taken from CHC A...
SS-rig 'Dyvi Alpha'
Norwegian semi-submersible drilling rig "Dyvi Alpha" (17,193 tons gross), photographed shortly befor...
SS-rig 'Polar Pioneer'
Liberian semi-submersible drilling rig "Polar Pioneer" photographed shortly before delivery to Norwa...
JW Maclean in the Cromarty Firth just off Invergordon.
in the firth of forth on 6/2/2014
Pic of the platform while it was being decommissioned.
Picture taken while the platform was being decommissioned.
GSF Grand Banks
GSF/Transocean Grand Banks at the Signal Shipyard in Pascagoula, MS. April 2014