Study on spectrum-based fatigue life direct calculation for spots of deep-water semi-submerged drilling unit;

深水半潜式钻井平台节点疲劳寿命谱分析研究；

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Drilling unit has the functions including rapid falling, slow work-feeding and quick feeding back to improve working efficiency.

钻孔单元具有空行程快进，慢速工进和快速回程功能，提高工作效率。

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The drilling unit is made of a very strong structure containing the single drilling spindles which run in perfectly ground bronze cylinders (sleeves).

钻头单元由一个强有力的包含单一钻锭的结构组成，钻定运行在完美的青铜圆柱（袖套）面上。

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Wolverine sold a working interest in their 100 square mile drilling unit incorporating Covenant to Oxy following the discovery.

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The rate was 0.97 for the Gulf drilling unit, over the target of 0.62, say minutes of an August 2009 meeting.

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Bankston, nominated by the United States of America, for placing their own lives at risk while rescuing survivors from the Deepwater Horizon Mobile Offshore Drilling Unit, in the Gulf of Mexico, following a devastating explosion on the rig in April 2010.

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