As part of that process they had to replace the dense drilling mud, which was used to keep the well under pressure while it was drilled, with sea-water.
在封井过程中，他们必须把用于在钻探过程里，保持钻井与海水压力相当的高密钻井泥更换掉：因为上方的海水的压力低于底下油气的压力。
The waters of the Arctic are particularly perilous for drilling because of the extreme cold, long periods of darkness, dense fogs and hurricane-strength winds.
对于海上钻探，北极的水域特别危险，因为极端寒冷，长时间的黑暗，密雾，以及飓风强度的大风。
Rigs form a dense ring around the tribe’s borders; only recently has drilling begun within.
钻井机密密麻麻地在部落边境上围成一个圈，直到最近才开钻。
Rigs form a dense ring around the tribe's borders; only recently has drilling begun within.
钻井机密密麻麻地在部落边境上围成一个圈，直到最近才开钻。
From upper Triassic to Jurassic of west Sichuan Depression, the rock is dense, the grinding is strong, the speed of well drilling is slow and the cycle of building well is long.
川西坳陷上三叠统至侏罗系地层主要表现为岩石致密、研磨性强，钻井速度慢，建井周期长。
From upper Triassic to Jurassic of west Sichuan Depression, the rock is dense, the grinding is strong, the speed of well drilling is slow and the cycle of building well is long.
川西坳陷上三叠统至侏罗系地层主要表现为岩石致密、研磨性强，钻井速度慢，建井周期长。
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