I recently ran across an article on the Energy In Depth website titled “Turning Natural Gas Into Water: Hydraulic Fracturing Doesn’t Deplete Water Supplies.” Energy In Depth is a website of the Independent Petroleum Association of America dedicated to “a research, education and public outreach campaign focused on getting the facts out about the promise and potential of responsibly developing America’s onshore energy resource base ” The article responds to an argument made by many organizations concerned about the large quantities of water used in fracing. The concern is that, while many uses of water return that water to the water cycle, water used in fracing is usually disposed of by injecting it underground, where it will never return to the water cycle.
Energy In Depth’s response to this argument is that, while injecting the used frac water — called “flowback” — does remove that water from the water cycle, the burning of the gas (or oil) produced by the wells creates more water than was used in the fracing of the wells. So, the argument goes, fracing of wells actually “creates” new water that is added to the water cycle. EID’s article goes on to calculate that, while a typical Marcellus gas well will remove 4 million gallons of water from the water cycle, that well will produce two billion cubic feet of gas which, when burned, will yield about 22 million gallons of “new” water. Within the well’s first six months of production, the gas it produces will create more than 4 million gallons of water when burned as fuel. Problem solved!
I asked a hydrologist friend of mine to look at EID’s calculations. He agreed that their math is correct, but he cautioned that the problem is not so simple. EID’s argument assumes that the energy created by burning the natural gas from EID’s typical well would not have been created by the burning of other fossil fuels. If, in other words, the gas is burned to create electricity, and if that electricity would have been created by burning coal if the well had not been drilled, then the net result is that water has been lost to the water cycle by injecting the flowback from the well.
