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Blue Water Rig No. 1. The first offshore mobile drilling platform was the Hayward-Barnsdall Breton Rig 20, first operated in 1949. [2] This rig had evolved from the inland drilling barges which were used to drill in marshes and protected waters in up to 10 feet of water. The Breton Rig 20 was 160 feet by 85 feet, and could work in 20 feet water ...
Deepsea Delta semi-submersible drilling rig in the North Sea Comparison of deepwater semi-submersible (left) and drillship (right). A semi-submersible platform is a specialised marine vessel used in offshore roles including as offshore drilling rigs, safety vessels, oil production platforms, and heavy lift cranes.
SSCV Sleipnir is a semi-submersible crane vessel (SSCV) owned and operated by the Netherlands-based Heerema Marine Contractors. It was ordered in 2015 and built in Singapore by Sembcorp Marine . It was named for Sleipnir , the eight-legged horse ridden by Odin in Norse mythology .
Semi-Submersible platforms have pontoons and columns, typically two parallel spaced apart pontoons with buoyant columns upstanding from those pontoons to support a deck. Some of the semi-submersible vessels only have a single caisson, or column, usually denoted as a buoy while others utilize three or more columns extended upwardly from buoyant ...
Semi-submersible platforms operate in a wider range of depths, mostly relatively deep, and bottom work is more likely to be in saturation and using heliox. There is also shallow work on the hull which is likely to be on air: inspection of thrusters, pontoons and the rest of the underwater structure of the rig and when necessary repair. [5]
Offshore drilling rig, c. 1968. The first semi-submersible resulted from an unexpected observation in 1961. [12] Blue Water Drilling Company owned and operated the four-column submersible Blue Water Rig No.1 in the Gulf of Mexico for Shell Oil Company. As the pontoons were not sufficiently buoyant to support the weight of the rig and its ...
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