Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (5): 519-526.DOI: 10.11944/j.issn.1000-0518.2015.05.140451

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Preparation and Properties of Flooding Copolymer P(AM/AMPSNa/AANa) for High-temperature and High-salinity Oil Reservoir with Mid-Low Permeability

YI Zhuoa, *, YANG Fulinb, LIU Xia, ZHAO Fangyuana, FANG Zhaoa, DU Chaoa, HU Xiaonaa   

  1. aBeijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation, Beijing 100013, China
    bResearch Institute of Petroleum Engineering Technology, Jiangsu Oilfield Branch, SINOPEC, Yangzhou, Jiangsu 225009, China
  • Received:2014-12-29 Revised:2015-03-17 Accepted:2015-03-24 Published:2015-05-05 Online:2015-05-05
  • Contact: YI Zhuo
  • Supported by:
    Supported by the China Petroleum & Chemical Corporation Project(No.212041)

Abstract:

Due to the constraints of the factors such as poor injectivity, mechanical shearing degradability, temperature-tolerated and salt-resisted ability, hydrolyzed polyacrylamide(HPAM) with high relative molecular mass has no obvious oil recovery in polymer flooding in mid-low permeability oil reservoirs. The temperature-tolerated and salt-resisted copolymer P(AM/AMPSNa/AANa) with micro-branched structure was synthesized by solution polymerization of acrylamide(AM), 2-acrylamide-2-methylpropanesulfonic acid(AMPS) with ammonium persulfate(APS)/N, N-dimethylaminoethyl methacrylate(DMAEMA) as initiating system. Influences of the reaction temperature, chain transfer agent, initiator content on the intrinsic viscosity of copolymer were investigated. The structure of copolymer was characterized by IR and 13C NMR spectra. The properties of copolymer with intrinsic viscosity 1915 mL/g were evaluated. The results indicate that the copolymer has superior shear-resistence, temperature-tolerance, salt-resisting, aging property, injection and displacement efficiency, which can be used as targeted flooding polymer in high-temperature and high-salinity oil reservoir with mid-low permeability.

 

Key words: mid-low permeability, polymer flooding, micro-branched structure, temperature-tolerated and salt-resisted, shear resistance, polyacrylamide

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