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[1]孙娜娜,柳健,蒋华义,等.改性磁性纳米粒子对稠油乳化降黏的影响[J].油气储运,2025,44(03):1-16.
Sun Nana,Liu Jian,Jiang Huayi,et al.The effect of modified magnetic nanoparticles on emulsification and viscosity reduction of heavy oil[J].Oil & Gas Storage and Transportation,2025,44(03):1-16.
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Sun Nana,Liu Jian,Jiang Huayi,et al.The effect of modified magnetic nanoparticles on emulsification and viscosity reduction of heavy oil[J].Oil & Gas Storage and Transportation,2025,44(03):1-16.
改性磁性纳米粒子对稠油乳化降黏的影响
《油气储运》[ISSN:1000-8241/CN:13-1093/TE]
卷:
44
期数:
2025年03期
页码:
1-16
栏目:
出版日期:
2025-03-25
- Title:
- The effect of modified magnetic nanoparticles on emulsification and viscosity reduction of heavy oil
- Keywords:
- modified magnetic nanoparticles; emulsification and viscosity reduction; pH; temperature; Oil-water ratio; Zeta potential; apparent viscosity; distribution of oil droplets
- 分类号:
- TE822
- 文献标志码:
- A
- 摘要:
- 【目的】乳化降黏技术是解决稠油运输困难常用的方法之一，但传统乳化剂制备的稠油乳状液稳定性较差，在运输过程中容易受外部环境影响导致破乳，研究发现磁性纳米粒子可以促进油水乳状液的稳定性，并且通过外加磁场可以实现循环再使用，而传统的磁性纳米粒子分散性差、沉降快、且对乳状液稳定性的促进效果差，易受外部环境影响。【方法】引入具有负电性与黏弹性的HPAM（聚丙烯酰胺）对磁性纳米粒子Co3O4进行改性，并通过实验探究pH值、乳化温度、油水比等因素对改性前后Co3O4制备的稠油O/W型乳状液稳定性的影响规律与作用机理。【结果】随着pH值升高，乳状液的稳定性增强，且Co3O4@HPAM对乳状液的稳定效果远高于Co3O4，在pH=10时，4 h后乳状液分水率仅为2.13%。乳状液稳定性变化的原因是：随着pH值增大，磁性纳米粒子的Zeta电位绝对值升高，油滴间静电排斥力变大；乳状液表观黏度逐渐增大，油滴运移阻力增强，降黏率逐渐减小，但均在98%以上；油水界面张力降低，有利于磁性纳米粒子吸附在油滴表面；油滴粒径变小、分布更加均匀。随着乳化温度升高，乳状液稳定性变差，当乳化温度为25 ℃时，4 h后Co3O4@HPAM与Co3O4制备的乳状液分水率分别为25.00%、52.28%；乳状液表观黏度均逐渐减小，降黏率先升高后降低，但均大于97%；油水界面膜强度降低，小油滴聚并为大油滴。在油水比小于等于7:3的条件下，随着油水比增大，乳状液表观黏度升高，降黏率逐渐减小，稳定性逐渐增强，油滴变小且数量增多；在油水比为8:2时，仅Co3O4@HPAM能成功制备O/W型乳状液，4 h分水率为10.25%，降黏率为97.92%。【结论】该研究充分解释了磁性纳米粒子在不同实验条件下对稠油乳状液稳定性的促进作用及机理，以期为磁性纳米粒子在稠油乳化降黏输送技术中的应用提供支持。
- Abstract:
- Abstract：[Objective] Emulsification and viscosity reduction technology is one of the commonly used methods to solve the difficulties in transporting heavy oil. However, the stability of heavy oil emulsions prepared by traditional emulsifiers is poor, and they are easily affected by external environments during transportation, leading to demulsification. Research has found that magnetic nanoparticles can promote the stability of oil-water emulsions and can be recycled through an external magnetic field. Traditional magnetic nanoparticles have poor dispersibility, fast settling, and poor promotion effect on emulsion stability, making them susceptible to external environmental influences. [Methods]To this end, HPAM (polyacrylamide) with negative charge and viscoelasticity is introduced to modify magnetic nanoparticles Co3O4, and the influence and mechanism of pH value, emulsification temperature, oil-water ratio and other factors on the stability of heavy oil O/W emulsion prepared by Co3O4 before and after modification are explored through experiments. [Reults] As the pH value increases, the stability of the emulsion is enhanced, and Co3O4@HPAM The stability effect of the emulsion is much higher than that of Co3O4, and at pH=10, the water separation rate after 4 hours is only 2.13%. The reason for the change in emulsion stability is that as the pH value increases, the absolute value of the Zeta potential of magnetic nanoparticles increases, and the electrostatic repulsion between oil droplets increases; The apparent viscosity of the emulsion gradually increases, the resistance to droplet transport increases, and the viscosity reduction rate gradually decreases, but all are above 98%; The decrease in interfacial tension between oil and water is conducive to the adsorption of magnetic nanoparticles on the surface of oil droplets; The particle size of oil droplets decreases and their distribution becomes more uniform. As the emulsification temperature increases, the stability of the emulsion deteriorates. When the emulsification temperature is 25 ℃, after 4 hours Co3O4@HPAM The water separation rates of the emulsion stabilized with Co3O4 were 25.00% and 52.28%, respectively; The apparent viscosity of the emulsion gradually decreases, and the viscosity decreases first and then decreases, but all are greater than 97%; The strength of oil-water interface facial mask is reduced, and small oil drops are aggregated into large oil drops. Under the condition of oil-water ratio ≤ 7:3, as the oil-water ratio increases, the apparent viscosity of the emulsion increases, the viscosity reduction rate gradually decreases, the stability gradually increases, and the number of oil droplets decreases and increases; When the oil-water ratio is 8:2, only Co3O4@HPAM Successfully prepared O/W emulsion with a water separation rate of 10.25% and a viscosity reduction rate of 97.92% after 4 hours. [Conclusion] This article successfully verifies the promoting effect and mechanism of magnetic nanoparticles on the stability of heavy oil emulsions under different experimental conditions. The research results provide important theoretical support for the use of magnetic nanoparticles in heavy oil emulsification and viscosity reduction transportation technology.
更新日期/Last Update:
2024-12-12