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Issue 9, 2018
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Comb-shaped polyzwitterion with surface-activity obtained via N-maleoyl chitosan-modified HPAM for displacement of residual oil

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Abstract

Herein, a novel water-soluble comb-shaped polyzwitterion (PNMASt) was prepared by introducing N-maleoyl chitosan, 2-(dimethyl(5-methyl-4-oxohex-5-en-1-yl)ammonio)ethyl sulfite, and other hydrophilic hydrophobic monomers into HPAM via free-radical copolymerization. Chemical structure determination and heat endurance analysis were accomplished via XRD, FTIR and 1H-NMR spectroscopy, SEM, and TGA. A simulated reservoir environment (shear rates, temperature, and salinity) was used to survey the solution performance and the rheology of the polyzwitterion as a function of the apparent viscosity and changing conditions. PNMASt exhibited excellent thickening efficiency, surface activity, anti-shear behavior, restorable action after shearing, heat tolerance, ageing tolerance, viscoelasticity, and salt tolerance as compared to HPAM under the same simulation environment. Furthermore, a core flooding experiment showed the remarkable flow control capability (Rf = 18.23 and RRf = 6.62), excellent oil production enhancement (13.32%), and remarkable residual oil displacement capacity (6.11%) of PNMASt as compared to those of HPAM.

Graphical abstract: Comb-shaped polyzwitterion with surface-activity obtained via N-maleoyl chitosan-modified HPAM for displacement of residual oil

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Publication details

The article was received on 26 Feb 2018, accepted on 19 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8NJ00951A
Citation: New J. Chem., 2018,42, 6848-6857
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    Comb-shaped polyzwitterion with surface-activity obtained via N-maleoyl chitosan-modified HPAM for displacement of residual oil

    S. Li, S. Gou, X. Chen and M. Duan, New J. Chem., 2018, 42, 6848
    DOI: 10.1039/C8NJ00951A

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