... 钻机滚筒的螺旋槽：spirallel 钻机工作天数：rig days 钻机定位：rig spotting ...
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Idle time had fallen to 24% of total rig days, from 34% in 2007.
WSJ: As CEO Hayward Remade BP, Safety, Cost Drives Clashed
The rig sank two days later, setting off an oil leak that has since released around 85, 000 barrels of oil into the Gulf.
WSJ: BP's Preparedness for Major Crisis Is Questioned
The rig sank two days later, leaving up to 19, 000 barrels (798, 000 gallons) of oil pouring into the Gulf, according to federal estimates.
CNN: BP robots steer cap to spewing well
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