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How fracking works

• Exxon's big bet on shale gas
4. Part of the water and sand mix flows back to the surface. The natural gas then flows up through the well.


This story is from the April 30, 2012 issue of Fortune.
By Brian O'Keefe, assistant managing editor @FortuneMagazine - Last updated April 16 2012: 6:54 AM ET
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