Primary Controlling Factors of Effect of Cation on the Viscosity of Polymer Solution Prepared by Sewage in Gasi High-salt Oil Reservoir
According to high salinity characteristics of reinjection wastewater in Gasi Block of Qinghai Oilfield,taking the polymer produced by Shandong Baomo as the research object,the influence of Na+,K+,Ca2+,Mg2+,Fe2+ and Fe3+ in the produced water from polymer flooding on the viscosity and stability of polymer solution was systematically discussed,and the main research methods of polymer blending with reinjection wastewater were provided.The experimental results showed that high-valent cations were the primary controlling factors to cause the reduction of polymer thickness,and the order of their influence from large to small was as follows:Fe2+,Fe3+,Mg2+,Ca2+,Na+,K+;and the order of effect of high-valent cations on the viscosity stability of polymer solutions from greatest to least was as follows:Fe2+,Ca2+(Mg2+),Fe3+,Na+(K+).This study demonstrates the effect mechanism of cations to the viscosity of polymer solution in reinjected sewage complexation,and provides theoretical guidance for polymer flooding technology.
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