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Scarabeo 8 is an ultra deepwater 6th generation semi-submersible drilling rigs. It is designed by Moss Maritime and its design type is CS50 MKII. [2] The rig is able to operate at the water depth up to 10,000 feet (3,000 m), which is classified by the oil industry as "ultra-deepwater", and its drilling depth is 10,660 metres (34,970 ft). [2]
Drillships are just one way to perform various types of drilling. This function can also be performed by semi-submersibles, jackups, barges, or platform rigs. [5] Drillships have the functional ability of semi-submersible drilling rigs and also have a few unique features that separate them from all others, first being the ship-shaped design. [6]
Transocean Marianas was an Earl & Wright Sedco 700 design semi-submersible platform drilling unit capable of operating in harsh environments and water depths up to 7,000 feet (2,100 m) using a 47.6 cm (18.75 in), 15,000 psi blowout preventer (BOP), and a 53 cm (21 in) outside diameter (OD) marine riser.
Seadrill is an offshore drilling contractor providing worldwide offshore drilling services to the oil and gas industry.Its primary business is the ownership and operation of drillships, semi-submersible rigs, and jack-up rigs for operations in shallow to ultra-deep water in both benign and harsh environments.
Tender assisted rigs are an existing type of development drilling, workover or plug and abandonment rig (same "family" as jack up rig, semi-submersible or drillship).). However, it is the only design that can operate in both shallow and deepwater (from 20 to 2,000 metres, 66 to 6,5
Byford Dolphin was a semi-submersible, column-stabilised drilling rig operated by Dolphin Drilling, a subsidiary of Fred Olsen Energy. Byford Dolphin was registered in Hamilton, Bermuda, [1] and drilled seasonally for various companies in the British, Danish, and Norwegian sectors of the North Sea. In 2019, Dolphin scrapped the rig. [3]
By 1958, the number of submersible drilling rigs had increased to around 30. [2] In 1961, Shell Oil successfully converted an existing submersible rig Blue Water Rig No.1 into the first semi submersible drilling unit for operation in the Gulf of Mexico when it was found to have good stability and motions whilst being towed at a partial draught. [3]
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.