Property Test Of Macromolecule Drag Reduction Agent

With the rapid development of petroleum industry, high molecular polymers as drag reduction agents (DRA)have been widely used in conduits during the transportation of crude oil. At the same time, more and more researchers attach importance to drag reduction agents .In this paper, the author briefly introduces the development of drag reduction allover the word and the polymerization method of drag reduction agent and the mechanism of drag reduction. Moreover, the author introduces the apparatus and process of middling experiment. The most part of this paper discuss how to valuate the DRA's performance .First ,the author introduce the principle that utilizes the simulative loop to evaluate DRA,and gives out a detailed evaluation apparatus．The components,design specifications and hydraulics characteristics are introduced．The n value of No．0 diesel has been determined and the value is 0.13．Then a series of DRA's have been synthesized in laboratory and their drag reduction efficiencies have been determined under different conditions．Comparative tests have shown that the performance of some samples have reached the DRA's imported from foreign countries．Besides,the interaction law between drag reduction efficiency and velocity of flow, stress of pipe wall , Reynolds number have been examined．The test results have shown that the drag reduction efficiency will reach the maximum when Reynolds number touches approximately 7 000(relatively to shear rate 1152 s-1),and with the Re's increment,the drag reduction efficiency will decrease due to shear and degradation. The interaction low between velocity of flow and the drag reduction efficiency is same with Re .When velocity is 2.1m/s the drag reduction efficiency reach the maximum . When the concentration of DRA in the fluid is 20 mg/L,the drag reduction efficiency will get to a maximum of 57%. For those DRAs that have the same molecule structure,the drag reduction efficiency can be predicted through the measurement of the DRA samples apparent viscosity．At the same time , the author discuss the no-Newtonian property of drag reduction fluid .At last ,the author introduce the application of drag reduction in the Shike transportation pipe ,the result show that the simulative loop can provide credible date for the valuation of DRA's performance in the reality pipe.