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MSV Seawell
''Seawell'' entered service in 1987 as a diving support vessel but it is widely credited with pioneering subsea light well intervention in the North Sea after completing its first well intervention project in 1988.〔"(Helix Well Ops UK Completes Well Intervention in West Africa )〕 In 1996 the ''Seawell'' performed what is thought to be the first ever installation of a replacement subsea tree from a Dynamically Positioned mono-hull vessel anywhere in the world.〔"(WELL SERVICING: Multipurpose vessels gaining favor for lower cost well intervention." )〕 In 1998 the ''Seawell'' completed the world's first ever wireline intervention on a horizontal subsea tree on Amoco Exploration's Arkwright Field in the North Sea.〔"(First wireline intervention on a subsea horizontal tree using a DSV )."〕 Currently owned by Helix Energy Solutions Group and operated by the company’s well intervention business unit, Helix Well Ops, the ''Seawell'' has entered more than 650 wells, decommissioned more than 150 live and suspended wells and 15 subsea fields.〔"(UK: Talisman Selects Helix Well Ops for Subsea Works on Its Assets )〕 The vessel is Dynamically Positioned and features a purpose-built derrick over a 7 m x 5 m moonpool and a traveling block rated to 80 Te capacity in passive mode.
==Notes==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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