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Blowout

In deep sea oil drilling, a blowout is the uncontrolled flow of oil or gas from a well that occurs when formation pressure exceeds the pressure applied to it by the column of drilling fluid. Every modern rig has a set of large control valves, known as blowout preventers, to stop the flow of oil, gas, and other well fluids if problems occur during drilling. Blowouts can lead to serious oil spills.