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A drillship is a merchant vessel designed for use in exploratory offshore drilling of new oil and gas wells or for scientific drilling purposes. In recent years the vessels have been used in deepwater and ultra-deepwater applications, equipped with the latest and most advanced dynamic positioning systems.
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.
Semi-submarine, which cannot fully submerge; Semi-submersible naval vessel, which partially submerges to minimize being observed; Semi-submersible platform, which is typically transported to a location where it is placed in service
Air independent propulsion (non-nuclear) can take various forms. All currently active AIP submarines require oxygen for AIP, [ clarification needed ] which is commonly stored as a liquid (LOX). AIP submarine range is primarily limited by the amount of LOX it can carry.
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).
A semi-submarine, taken out of the water. A semi-submarine (semi-sub) is a surface vessel that is not capable of diving, but has accommodation space below the waterline featuring underwater windows. [1] The watercraft is similar to glass-bottom boats, but with deeper draft. Both types of boats are mainly used to provide sight-seeing trips for ...
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.
Jackup platforms are almost exclusively used as exploratory oil and gas drilling platforms and as offshore and wind farm service platforms. [2] Jackup rigs can either be triangular in shape with three legs or square in shape with four legs. [2] Jackup platforms have been the most popular and numerous of various mobile types in existence.