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In oil, the name of the game these days is how long can you go. On Apr. 16, ExxonMobil (XON) said it had completed a well that reaches 7,000 feet below the sea and extends 6.3 miles across. That adds up to more than 37,000 feet, a North American record. Output from the well, which is off the coast of California, will be equivalent to 5.8 million barrels of oil per year.