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These include bottom founded drilling rigs (jackup barges and swamp barges), combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units (MODU) including semi-submersibles or drillships. These are capable of operating in water depths up to 3,000 metres (9,800 ft).
There are more jackup rigs in the worldwide offshore rig fleet than other type of mobile offshore drilling rig. Other types of offshore rigs include semi-submersibles (which float on pontoon-like structures) and drillships, which are ship-shaped vessels with rigs mounted in their center. These rigs drill through holes in the drillship hulls ...
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 depth.
These include bottom-founded drilling rigs (jackup barges and swamp barges), combined drilling and production facilities, either bottom-founded or floating platforms, and deepwater mobile offshore drilling units (MODU), including semi-submersibles and drillships. These are capable of operating in water depths up to 3,000 metres (9,800 ft).
Deepwater Nautilus is a fifth-generation, RBS-8M design, ultra-deepwater, column-stabilized, semi-submersible mobile offshore drilling unit, designed to drill subsea wells for oil exploration and production. [4] She was designed by Reading & Bates RBS-8M and built by Hyundai Heavy Industries in 2000 at the Ulsan shipyard in South Korea.
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.
MODU – mobile offshore drilling unit (either of jack-up drill rig or semi-submersible rig or drill ship) MOF – marine offloading facility; MOPO – matrix of permitted operations; MOPU – mobile offshore production unit (to describe jack-up production rig, or semi-submersible production rig, or floating production, or storage ship)
Drilling in deep waters can be performed by two main types of mobile deepwater drilling rigs: semi-submersible drilling rigs and drillships.Drilling can also be performed from a fixed-position installation such as a fixed platform, or a floating platform, such as a spar platform, a tension-leg platform, or a semi-submersible production platform.