George Mitchell, the pioneer of extracting shale gas economically, who died on July 26th, rarely talked to the press. In May 2012 The Economist conducted a written interview with him:
Fracking is an old technique, as is horizontal drilling. Geologists had long been aware of the huge reserves of shale gas. What made you decide that you could use the former to tap the latter? Had others before you tried and failed to make fracking and horizontal drilling economically viable?
Big oil companies knew the upside potential of shale gas, and many were working to economically extract the gas from the shale without much success. Many people were trying to make fracking work better, but they weren’t able to get the cells to give up the gas.
We knew there was gas in some of these shale fields. We would measure the volume of gas in the reservoir and it was very high methane (25-40% methane). You could get to the methane, but you couldn’t get it to leave the cells until you fractured it, and that was the major breakthrough.
Written by S.W. To read the full article, click here.
Here’s another use for fracking: expanding access to hot rocks deep beneath Earth’s surface for energy production. In April Ormat Technologies hooked up the first such project—known in the lingo as an enhanced geothermal system, or EGS—to the nation’s electric grid near Reno, Nev.
“The big prize is EGS,” enthuses Douglas Hollett, director of the Geothermal Technologies Office at the U.S. Department of Energy (DoE). “The key is learning how to do it in a reliable way, in a responsible way.”
By some estimates, the U.S. could tap as much as 2,000 times the nation’s current annual energy use of roughly 100 exajoules (an exajoule equals a quintillion, or 1018 joules) via enhanced geothermal technologies. With respect to electricity, the DoE concludes at least 500 gigawatts of electric capacity could be harvested from such EGS systems. Even better, hot rocks underlie every part of the country and the rest of the world. Australia’s first enhanced geothermal system, spicily named Habanero, began producing power in May, and Europe has brought three such power plants online.
Written by David Biello. To read the full article, click here.