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HOUSTON, Sept. 19, 2014 /PRNewswire/ — PATTERSON-UTI ENERGY, INC. (PTEN) today announced that one of its subsidiaries has entered into an agreement to acquire the Texas-based pressure pumping assets of a privately held company.  The acquisition includes 143,250 horsepower of hydraulic fracturing equipment, which was manufactured in 2011 and 2012, and provides Patterson-UTI with two additional …