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Chevron Brazil Spill Shows Drillers Still Trip in Crises

Last Nov. 7, something went wrong at a deep-sea oil well operated by Chevron Corp. 230 miles (370 kilometers) northeast of Rio de Janeiro.

As a massive drill bit punctured reservoir N560, roughly 3,500 feet beneath the ocean floor, monitors revealed pressure much higher than technicians expected. The next day a routine flyover of the field, called Frade, in the Campos Basin, revealed oil on the water’s surface.