Preparation and Performance of Magnetic Polymer-composite Microspheres Profile Control Agent by Multilayer Assembly†

doi:10.7503/cjcu20170469

Abstract

Abstract:

The magnetic gel microspheres P(AA-AM-AN)/Fe₃O₄ were prepared by inverse emulsion polymerization and precipitation polymerization using iron oxide (Fe₃O₄), acrylamide (AM), acrylic acid (AA) and acrylonitrile (AN) as raw materials. The P(AA-AM-AN)/Fe₃O₄ were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and vibrating sample magnetometer(VSM). At the same time, The water-absorption performance of the magnetic profile control agents were studied under different preparation conditions and the profile control performance was discussed under simulated stratum environment condition. The experimental results show that the P(AA-AM-AN)/Fe₃O₄ magnetic composite microspheres were prepared, the microspheres have superparamagnetism, and can realize magnetic separation and recovery. The prepared microspheres have good transport properties due to the presence of hydrophobic polyacrylonitrile. The water-absorption performance of the magnetic gel microspheres is superior to others when the mass ratio of AN and P(AA-AM)/Fe₃O₄ is 1.25∶1, or rather, the water absorption rate is as high as 82.8 g/g. Besides, the water absorption rate of the magnetic gel microspheres was gradually increased with the increase of the water temperature of reservoir formation, and the decrease of NaCl content.

Key words: Profile control agent, Water absorption rate, Magnetic polymer-composite microsphere

CLC Number:

O631.5

TrendMD:

ZHANG Dingjun, BAI Xue, CHEN Yuxian, WU Yanfei, LI Xianwen, CHEN Zhenbin, MA Yingxia. Preparation and Performance of Magnetic Polymer-composite Microspheres Profile Control Agent by Multilayer Assembly^†[J]. Chem. J. Chinese Universities, 2018, 39(3): 583.

Figures/Tables 8

Scheme 1 Simulation diagram of the preparation of microspheres profile control agent

Fig.1 FTIR spectra of Fe3O4(a), KH570 modified Fe3O4(b), P(AA-AM)/Fe3O4(c) and P(AA-AM-AN)/Fe3O4(d)

Fig.2 Dispersion of KH570 modified Fe3O4 nanoparticles in methanol(a), ethanol(b), cyclohexane(c), liquid paraffin(d) and distilled water(e)

Fig.3 SEM images of Fe3O4 (A), KH570 modified Fe3O4(B), P(AA-AM)/Fe3O4(C) and P(AA-AM-AN)/Fe3O4(D)Insets: enlarged graphs of rectangles in (C) and (D), respectively.

Fig.4 Effects of AN dosage on water absorption rate at 20 ℃(A), 30 ℃(B), 40 ℃(C),50 ℃(D) and 60 ℃(E)m(AN)∶m[P(AA-AM/Fe3O4]: a. 0.50∶1; b. 0.75∶1; c. 1.00∶1; d. 1.25∶1; e. 1.50∶1.

Fig.5 Effects of temperature on water absorption of P(AA-AM)/Fe3O4(A, C) and P(AA-AM-AN)/Fe3O4(B, D)(A), (B) 0—6000 min; (C) 0—100 min; (D) 0—340 min. Temperature/℃: a. 20; b. 30; c. 40; d. 50; e. 60.

Fig.6 Effects of NaCl content on water absorption rate of P(AA-AM)/Fe3O4(A) and P(AA-AM-AN)/Fe3O4(B)Concentration of NaCl/(mg·mL-1): a. 1; b. 3; c. 5; d. 7; e. 9.

Fig.7 Hysteresis loops of P(AA-AM-AN)/Fe3O4 nanoparticleInset: P(AA-AM-AN)/Fe3O4 photos without(a) and with(b) magnetic.

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