Ultra Petroleum – Hydraulic Fracturing – 2011 (status: 41.7%)

Onshore "unconventional" natural gas production often requires hydraulic fracturing, which typically injects a mix of millions of gallons of water, thousands of gallons of chemicals, and particles deep underground to create fractures through which gas can flow for collection. According to the American Petroleum Institute, "up to 80 percent of natural gas wells drilled in the next decade will require hydraulic fracturing."