Rig 257 is the world’s only arctic-class barge rig, designed to drill year-round in conditions such as extreme temperatures, arctic ice, and reservoir conditions with high-temperature, high-pressure wells. The rig operates with a strict zero-discharge policy, enabling it to drill with a reduced impact on the environment.
A compliant tower (CT) is a fixed rig structure normally used for the offshore production of oil or gas. The rig consists of narrow, flexible (compliant) towers and a piled foundation supporting a conventional deck for drilling and production operations.
The first concrete gravity platform in the North Sea was a C G Doris platform, the Ekofisk Tank, in Norwegian waters. The structure has a shape not unlike a marine sea island and is surrounded by a perforated breakwater wall (Jarlan patent).
Semi-submersible vessel is majorly used in marine operations carried out in the high seas like oil drilling and production platforms for oil. In addition, Semi submersible ships are also used as heavy duty cranes. The features and the highlights of the semi-submersible ships and the semi-submersible rigs can be explained in detail in the article.
A spar is a type of floating oil platform typically used in very deep waters, and is named for logs used as buoys in shipping that are moored in place vertically. Spar production platforms have been developed as an alternative to conventional platforms.
A tension-leg platform (TLP) or extended tension leg platform (ETLP) is a vertically moored floating structure normally used for the offshore production of oil or gas, and is particularly suited for water depths greater than 300 metres (about 1000 ft) and less than 1500 metres (about 4900 ft). Use of tension-leg platforms has also been proposed for wind turbines.