A new study published by The University of Texas’ Bureau of Economic Geology compares the amount of water used in producing oil from shale plays to the water used in producing oil from conventional reservoirs. The study concludes that water use for conventional and unconventional oil production is about the same. “Comparison of Water Use for Hydraulic Fracturing for Shale Oil and Gas Production versus Conventional Oil.“
The study looked at water use in the Bakken and Eagle Ford plays. The ratio of water used to oil produced ranged from 0.2 to 0.4 gallons of water for each gallon of oil produced over the lifetime of a well in both plays – or 0.03 to 0.06 gallons of water per million British thermal units of energy from the oil produced. In comparison, U.S. conventional production uses from 0.1 to 5 gallons of water for each gallon of oil produced.
The study’s conclusion: “the U.S. is using more water because HF [hydraulic fracturing] has expanded oil production, not because HF is using more water per unit of oil production.”
According to the study, the amount of water used per mmBtu produced in the Bakken is substantially less than in the Eagle Ford: water use per well in the Bakken is about half that in the Eagle Ford, and about one-third per mmBtu of energy produced.