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Even go along with the requirements of industrial oil-dependent we need to increase the capacity of oil extracted from wells through certain methods such as using looping method, drag reducing method, additional pumping capacity, blending light with heavy crude oil and another several methods.The presented case study concentrates on looping method which has the purpose of splitting the flow through a parallel segment of the pipeline between the two locations, resulting in a reduced pressure drop in that segment of the pipeline. And drag reducer agent which can help by reducing the frictional pressure loss, and can also reduce the pressure drop by the reactions between the chemical agent(polymer molecules) and the flowing oil.