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  1. Article ; Online: Tunable Viscoelastic Properties of Sodium Polyacrylate Solution via CO 2 -Responsive Switchable Water

    Dianguo Wu / Yiwen Shi / Kun Lv / Bing Wei / Youyi Zhu / Hongyao Yin / Yujun Feng

    Molecules, Vol 26, Iss 3840, p

    2021  Volume 3840

    Abstract: Upon stimulus by CO 2 , CO 2 -switchable viscoelastic fluids experience a deliberate transition between non-viscous and highly viscous solution states. Despite attracting considerable recent attention, most such fluids have not been applied at a large- ... ...

    Abstract Upon stimulus by CO 2 , CO 2 -switchable viscoelastic fluids experience a deliberate transition between non-viscous and highly viscous solution states. Despite attracting considerable recent attention, most such fluids have not been applied at a large- scale due to their high costs and/or complex synthesis processes. Here, we report the development of CO 2 -switchable viscoelastic fluids using commercially available sodium polyacrylate (NaPAA) and N , N -dimethyl ethanol amine (DMEA)-based switchable water. Upon bubbling CO 2 , into the solutions under study, DMEA molecules are protonated to generate quaternary ammonium salts, resulting in pronounced decreases in solutions viscosity and elasticity due to the influence of increased ionic strength on NaPAA molecular conformations. Upon removal of CO 2 via introduction of N 2 , quaternary salts are deprotonated to tertiary amines, allowing recovery of fluid viscosity and elasticity to near the initial state. This work provides a simple approach to fabricating CO 2 -switchable viscoelastic fluids, widening the potential use of CO 2 in stimuli-responsive applications.
    Keywords viscoelastic fluids ; CO 2 -switchable ; sodium polyacrylate ; N,N -dimethyl ethanol amine ; Organic chemistry ; QD241-441
    Subject code 290
    Language English
    Publishing date 2021-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Hydrophobically Associating Polymers Dissolved in Seawater for Enhanced Oil Recovery of Bohai Offshore Oilfields

    Fei Yi / Bo Huang / Chengsheng Wang / Xiaoxu Tang / Xiujun Wang / Quangang Liu / Yanhui Su / Shijia Chen / Xiaoyan Wu / Bin Chen / Jing Zhang / Dianguo Wu / Shuai Yu / Yujun Feng / Xin Su

    Molecules, Vol 27, Iss 2744, p

    2022  Volume 2744

    Abstract: As compared to China’s overall oil reserves, the reserve share of offshore oilfields is rather significant. However, offshore oilfield circumstances for enhanced oil recovery (EOR) include not just severe temperatures and salinity, but also restricted ... ...

    Abstract As compared to China’s overall oil reserves, the reserve share of offshore oilfields is rather significant. However, offshore oilfield circumstances for enhanced oil recovery (EOR) include not just severe temperatures and salinity, but also restricted space on offshore platforms. This harsh oil production environment requires polymers with relatively strong salt resistance, solubility, thickening ability, rapid, superior injection capabilities, and anti-shearing ability. As a result, research into polymers with high viscosity and quick solubility is recognized as critical to meeting the criteria of polymer flooding in offshore oil reservoirs. For the above purposes, a novel hydrophobically associating polymer (HAP) was prepared to be used for polymer flooding of Bohai offshore oilfields. The synthetic procedure was free radical polymerization in aqueous solutions starting at 0 °C, using acrylamide (AM), acrylic acid (AA), 2-acrylamido-2-methylpropane sulfonic acid (AMPS), and poly(ethylene glycol) octadecyl methacrylate (POM) as comonomers. It was discovered that under ideal conditions, the molecular weight of HAP exceeds 2.1 × 10 7 g⋅mol −1 . In a simulated reservoir environment, HAP has substantially greater solubility, thickening property, and salt resistance than conventional polyacrylamide (HPAM), with equivalent molecular weight. Finally, the injectivity and propagation of the two polymers in porous media were investigated. Compared with HPAM, which has a similar molecular weight, HAP solution with the concentration of 0.175% had a much better oil displacement effect in the porous medium, which can enhance oil recovery by 8.8%. These discoveries have the potential to pave the way for chemical EOR in offshore oilfields.
    Keywords hydrophobically associating polymers ; sea water ; viscosity ; enhanced oil recovery ; polymerization ; Organic chemistry ; QD241-441
    Subject code 660 ; 333
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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