![Offshore Offshore](/uploads/1/2/4/7/124733868/793319213.jpg)
Concrete gravity platform rig Definition. The platform is floated to the drilling site in a vertical position, and at the site tall caissons that serve as the foundation of the platform are flooded so that the platform submerges and comes to rest on bottom. Because of the enormous weight of the platform, the force of gravity alone keeps it in. The Sleipner A platform produces oil and gas in the North Sea and is supported on the seabed at a water depth of 82 m. It is a Condeep type platform with a concrete gravity base structure consisting of 24 cells and with a total base area of 16 000 m 2. Four cells are elongated to shafts supporting the platform deck.
Concrete platformCONCRETE gravity baseOffshore oil development, especially in the North Sea, has brought up a completelydifferent design of fixed platform: concrete platforms.Concrete platforms aregenerally larger structure than steel jackets and are not piled but instead sit on the seabed, stabilisedby their own massive weight. Apart from the North Sea, gravity concrete structureswere built in Brazil (3), Gulf of Mexico and the Mississippi Delta. The concept can servealmost any offshore purpose such as drilling and exploration, oil and gas productionand storage.
![A Concrete Gravity Platform A Concrete Gravity Platform](http://cdgwebsites.com/mcalpine-test/files/project/2523/Ardyne_2___Main.jpg)
General partnership between SNC-Lavalin, Dragados Canada and Pennecon has been awarded a construction contract from Husky Energy as part of the company’s West White Rose Project in Newfoundland and Labrador.SNC-Lavalin and Dragados Canada each hold 40% of the shares, while local company Pennecon is a 20% partner.The partnership will build a concrete gravity structure (CGS) for a fixed drilling platform. The CGS, with an overall height of 145m and base diameter of 122m, will require 76,000m3 of concrete in its construction, which will take place in a purpose built dry dock from 2017 to 2021. Once completed and installed in the White Rose field, the CGS will support a topside module to enable drilling and oil extraction 350km away from the coast of Newfoundland in the Atlantic Ocean.“We are honoured to be part of such a significant project and are especially pleased to be using our infrastructure skills in the oil and gas industry,” said Ian L.
Edwards, Infrastructure President, SNC-Lavalin.