Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (6): 20230456.doi: 10.7503/cjcu20230456

• Physical Chemistry • Previous Articles     Next Articles

Interaction Between Hot Water Chemical Drive System and Thick Oil Components and Theoretical Simulation Research

HAN Yugui1, LIU Changlong1, ZHAO Peng1, ZHENG Wenwen2, LIU Yuepeng2, LI Yi2()   

  1. 1.China National Offshore Oil Corporation,Tianjin Branch,Tianjin 300452,China
    2.School of Science,Tianjin University,Tianjin 300072,China
  • Received:2023-10-31 Online:2024-06-10 Published:2024-03-22
  • Contact: LI Yi E-mail:liyi@tju.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22176140)

Abstract:

To investigate the effects of temperature and polymer chemistry on the properties of thick oil, the thick oil fractions were analyzed by scanning electron microscopy, Fourier transform infrared spectrometer and rheometer. scanning electron microscopy. Results indicated that the asphaltene surface morphology was irregular, and the colloid surface was rough and had a pore structure. Fourier infrared spectroscopy detected three thick oil fractions with characteristic absorption peaks of aromatic hydrocarbons. Rheological performance test was conducted to investigate the effects of polymer chemical addition, mineralization, temperature and pH on the rheological performance and interfacial film properties of thick oil. The experimental results showed that the polymer dosage had a significant effect on the energy storage modulus and loss modulus of the thick oil, while the increase of mineralization enhanced the complex viscosity of the thick oil, and the viscoelasticity of the thick oil was stronger under acidic and alkaline conditions than that under neutral conditions. It was found through theoretical studies that the addition of polymer chemistries reduced the viscosity of thick oil and the effect was more pronounced at higher temperatures. The interaction between bitumen and polymer chemicals was the strongest, followed by colloid and the weakest interaction with oil components. The polymer chemical had no significant effect on the radial distribution function of the thick oil components, and mainly affected the thick oil components at the interface. Polymer chemicals and bitumen could form hydrogen bonds, and the addition of polymer chemicals decreased the number of hydrogen bonds within the bitumen and increased the number of hydrogen bonds with the polymer chemicals. The increase of temperature decreased the number of hydrogen bonds, especially between the asphaltene and the polymer chemical.

Key words: Hot water chemical drive, Rheological property, Theoretical calculation, Molecular dynamics simulation

CLC Number: 

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