Encana Corporation (ECA)

[Timothy Smith]

So far U.S. shale oil production has blown past the U.S. Energy Information Administration's (EIA) estimates.

Two years ago, EIA predicted shale oil production could reach 2.8 million barrels per day by 2035; just a year later, in 2013, the U.S. produced 3.5 million barrels.

The agency has now forecast a 37% increase in shale oil production between 2013 and 2020, based on output from nine different regions.