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'''''Q4000''''' is a multi-purpose oil field construction and intervention vessel ordered in 1999 by [[Cal Dive International]], and was built at the [[Keppel Corporation|Keppel AmFELS]] shipyard in [[Brownsville, Texas]] for $180 million. She was delivered in 2002 and operates under the flag of the United States.<ref>{{cite web| title=Cal Dive takes delivery of Q4000 | url=http://www.oilpubs.com/oso/article.asp?v1=2975 | work=Offshore Shipping Online | date=12 April 2002 | access-date=7 June 2010}}</ref> She is operated by [[Helix Energy Solutions Group]].<ref name=upstream080610>{{cite news | author=Noah Brenner; Anthea Pitt | title=BP calls in FPSO for Macondo | url=http://www.upstreamonline.com/live/article217033.ece | work=Upstream Online | date=28 May 2010 | access-date=7 June 2010}}</ref> The original ''Q4000'' concept was conceived and is owned by SPD/McClure. The design was later modified by [[Bennett Offshore]], which was selected to develop both the basic and detailed design.<ref>{{Cite web |url=http://www.bennettoffshore.com/semis.html |title=Basic and detailed design of the Q4000 |access-date=2016-04-15 |archive-url=https://web.archive.org/web/20160411213641/http://www.bennettoffshore.com/semis.html |archive-date=2016-04-11 |url-status=dead }}</ref>
 
''Q4000'' also has a column-stabilized [[semisubmersible]] design that combines [[dynamic positioning|dynamically positioned]] station-keeping with a large deck space, significant deck load capacity and a high transit speed of 12 knots. The vessel provides a stable platform for a wide variety of tasks, including subsea completion, decommissioning and coiled tubing deployment, and she is specifically designed for oil well intervention and construction in depths of up to 3000 meters of water.
 
==Specifications==