发明名称 |
Drilling vessel and method |
摘要 |
A drilling vessel (10) for well operations, which drilling vessel (10) comprises a derrick (20) and a crown assembly (40) on the derrick (20), the arrangement being such that, in use, said crown assembly (40) is movable between a first position and a second position, in which second position said derrick (20) has an overall height less than said first position. |
申请公布号 |
EP2208853(A3) |
申请公布日期 |
2014.02.19 |
申请号 |
EP20100150176 |
申请日期 |
2010.01.06 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
LUCAS, ALAN RANDALL;MCCOO, MARCUS SHERWIN |
分类号 |
E21B15/02;B63B35/44;E21B19/09 |
主分类号 |
E21B15/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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