11 Mar '12, 9pm

Energy - March 11 | Energy Bulletin: Many more articles are available through the Energy Bulletin homepage. Oil

Or, in the case of the books under review, by “fracking” the subsurface geology in order to make natural gas flow through new cracks. The word is short for “hydraulic fracturing” and in the words of Seamus McGraw, it works like this: having drilled a hole perhaps a mile deep, and then a horizontal branch perhaps half a mile in length, you send down a kind of subterranean pipe bomb, a small package of ball-bearing-like shrapnel and light explosives. The package is detonated, and the shrapnel pierces the bore hole, opening up small perforations in the pipe. They then pump up to 7 million gallons of a substance known as slick water to fracture the shale and release the gas. It blasts through those perforations in the pipe into the shale at such force—more than nine thousand pounds of pressure per square inch—that it shatters the shale for a few yards on either side of the pip...

Full article: http://www.energybulletin.net/stories/2012-03-11/energy-m...

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