![]() ![]() ![]() The Marcellus Shale, Utica Shale, Barnett Shale, Eagle Ford Shale, and Bakken Formation are examples of previously unproductive rock units that have been converted into fantastic gas or oil fields by hydraulic fracturing. Hydraulic fracturing combined with horizontal drilling has turned previously unproductive organic-rich shales into the largest natural gas fields in the world. The goal is to create a network of interconnected fractures that will serve as pore spaces for the movement of oil and natural gas to the well bore. It is done by pumping liquids down a well into subsurface rock units under pressures that are high enough to fracture the rock. Hydraulic fracturing is a procedure that can increase the flow of oil or gas from a well. An enormous assemblage of pumps, diesel engines, water trucks, sand mixers, and plumbing fixtures is in place for the frac. Pumps and diesel engines ready for the frac: Photo of a hydraulic fracturing operation being conducted at a drilling pad in the Marcellus Shale gas play of southwestern Pennsylvania. ![]()
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