JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2016, Vol. 46 ›› Issue (1): 80-85.doi: 10.6040/j.issn.1672-3961.0.2015.068

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Study on the effect and mechanism of oilfield produced water quality on reducing the viscosity of polymer solution

HU Bo1, WANG Fang2, GAO Baoyu2*, XU Shiping2, MA Baodong3   

  1. 1. Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    2. School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China;
    3. Academy of Geological Sciences in Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China
  • Received:2015-03-16 Online:2016-02-20 Published:2015-03-16

Abstract: According to preparing polymer solution by oilfield produced water, the effects of Na+, K+, Ca2+, Mg2+, Fe2+ and S2-ions on the polymer solution viscosity were investigated and compared. Those ions had a negative impact on polymer solution viscosity, and meanwhile Fe2+ had the most remarkable impact. Divalent cations exerted much more effects than monovalent ones. The mechanisms of reduced HPAM viscosity were studied by IR and SEM, respectively. The results showed that Na+, K+, Ca2+ and Mg2+decreased HPAM solution viscosity by interacting with the carboxylate anions, which may lead to the polymer curl. For Fe2+, the viscosity degradation was attributed to a series of free-radical reactions, which could cause disintegration of the polymer chains and reduction of the viscosity.

Key words: viscosity loss ratio, metal ions, sulfide ion, hydrolyzed polyacrylamide, mechanism of viscosity degradation, ferrous iron

CLC Number: 

  • TE357
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