MOBILE OFFSHORE DRILLING UNIT
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United States of America Patent
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Issued Date -
Aug 28, 2014
app pub date -
Aug 24, 2012
filing date -
Aug 24, 2012
priority date (Note) -
Abandoned
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Abstract
A mobile offshore drilling unit is described that has an operating deck supported on a submersible deck, which may be a pontoon deck or a mat deck, by four or more columns, wherein a ratio of displacement of the mobile offshore drilling unit to total column cross-sectional area is at least about 40 mT/m2 during operation. The submersible deck has a recess at each end with a thruster group disposed in each recess. The thrusters of the thruster group are displaced in a longitudinal direction and a transverse direction from each other.
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