当前位置: X-MOL 学术Ind. Eng. Chem. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Deposition of Dispersed Nanoparticles in Porous Media Similar to Oil Sands. Effect of Temperature and Residence Time
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2018-01-31 00:00:00 , DOI: 10.1021/acs.iecr.7b03484
Victor M. Rodriguez-DeVecchis 1 , Lante Carbognani Ortega 1 , Carlos E. Scott 1 , Pedro Pereira-Almao 1
Affiliation  

The use of nanoparticles for a wide variety of purposes is attracting much interest among large oil producers. Technologies that intend to adsorb noxious components or to modify flow patterns to enhance oil recovery or to upgrade the oil in place before pipelining are being subject to significant consideration with high potential to impact the environmental and economic performance of this industry. A key aspect for chemical processes targeting the construction of adsorbers or reaction zones in the reservoir strides in the particles retention in the porous medium zone of interest, especially when a temperature above the one in the reservoir is applied. This work addresses the effect of different operation variables in the nanoparticle deposition process. Of great importance is not only the amount of particles retained but also the profile, morphology, dispersion, and penetration in the porous medium. A Ni–Mo–W dispersed nanoparticulate was evaluated. The deposition process was conducted at moderate conditions of temperature and residence time. During this process, retention of naturally occurring metals, mainly vanadium, in the bitumen was found to be in the low range of 25–70 ppm wt. High particle retention, over 95%, was obtained in every case, with no observable effect on the sandpack’s oil permeability. The analysis of particle size distributions before and after passing through the sand pack was shown to have no significant variation. The concentration profiles along the porous media are similar for all experimental conditions investigated with around 30% of nanoparticles depositing at the entrance of the media. Correlations for the profile and cumulative concentration along the porous media core are proposed. Particles were identified and measured by Scanning Electron Microscopy-Energy Dispersion X-ray Analysis (SEM-EDX) along the full length of the porous media core in each case. Low temperature deposition test runs showed particles deposited as large agglomerates all along the porous medium, while for high temperature deposition test runs, individually deposited particles were observed.

中文翻译:

类似于油砂的多孔介质中分散纳米颗粒的沉积。温度和停留时间的影响

将纳米颗粒用于多种目的引起了大型石油生产商的极大兴趣。旨在吸收有害成分或改变流型以提高采油率或在管道输送前对油进行升级的技术正受到重大考虑,这些技术具有很大的潜力来影响该行业的环境和经济绩效。针对在储层中构造吸附器或反应区的化学过程的一个关键方面,是大大提高了目标多孔介质区域中的颗粒截留率,尤其是在施加高于储层中温度的情况下。这项工作解决了纳米粒子沉积过程中不同操作变量的影响。极为重要的是,不仅保留了颗粒的数量,而且轮廓 多孔介质中的形态,分散和渗透。评估了Ni-Mo-W分散的纳米颗粒。沉积过程在适当的温度和停留时间条件下进行。在此过程中,发现天然存在的金属(主要是钒)在沥青中的保留量在25-70 ppm wt的低范围内。在每种情况下,均能获得超过95%的高颗粒保留率,而对沙袋的油渗透性没有明显影响。通过沙包之前和之后的粒度分布分析显示没有显着变化。在所研究的所有实验条件下,沿多孔介质的浓度分布都相似,大约有30%的纳米颗粒沉积在介质入口处。提出了沿着多孔介质芯的轮廓和累积浓度的相关性。在每种情况下,沿着多孔介质芯的全长,通过扫描电子显微镜-能量色散X射线分析(SEM-EDX)识别和测量颗粒。低温沉积试验表明,颗粒沿着多孔介质以大的团块形式沉积,而高温沉积试验表明,观察到了单独沉积的颗粒。
更新日期:2018-01-31
down
wechat
bug