热水化学驱体系与稠油组分间相互作用及其理论模拟研究OA北大核心CSTPCD

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 bitu-men 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 tempera-ture decreased the number of hydrogen bonds,especially between the asphaltene and the polymer chemical.