a process and process line is provided for preparing a friction - reduced hydraulic fracturing fluid at a central location which can be readily transported to an oil or gas well in a formation at a well site , comprising : preparing a mixture of polymer and water at the central location by shearing the polymer in the water in a high shear environment to create the friction - reduced hydraulic fracturing fluid ; pumping the friction - reduced hydraulic fracturing fluid through a series of pumps and pipelines to the well site ; and injecting the hydraulic fracturing fluid into the oil or gas well at a pressure sufficient to cause fracturing of the formation .