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Wettability alteration and retention of mixed polymer-grafted silica nanoparticles onto oil-wet porous medium

Petroleum Science 2021年第3期18卷 962-982页

作者： Hamid Daneshmand Masoud Rezaeinasab Masoud Asgary meysam karimi Department of Physics University of TehranTehranIran Department of Chemistry Faculty of ScienceYazd UniversityYazdIran Department of Materials Engineering Tarbiat Modares UniversityTehranIran Department of Material Science Shahreza BranchIslamic Azad UniversityIsfahanIran

Enhanced oil recovery(EOR)processes are applied to recover trapped or residual oil in the reservoir rocks after primary and secondary recovery *** the wettability of the rock from oil-wet to water-wet is named wettability *** is an important factor for *** to their unique properties,nanoparticles have gained great attention for improving oil *** the promising results,the main challenges of applying nanoparticles are related to the colloidal stability of the nanofuids in the harsh conditions of the *** recent years,polymer-grafted nanoparticles have been considered as novel promising materials for *** obtained results showed that adding a hydrophobic agent trimethoxy(propyl)silane on the surface of modifed silica nanoparticles with polyethylene glycol methyl ether has an efective role in improving retention and wettability alteration,especially in the oil-wet substrate due to hydrophobic *** modifed silica nanoparticle by mixed polyethylene glycol methyl ether(Mn~5000)and trimethoxy(propyl)silane showed a proper performance at a concentration of 1000 ppm and a salinity range of 2000-40,000 *** obtained fndings can help for a better understanding of the silica nanofuid modifcation with both hydrophilic and hydrophobic agents for the EOR application of near-wellbore.

关键词： Wettability alteration Retention Silica nanoparticle Surface modifcation Enhanced oil recovery

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Life cycle assessment of oxygen-18 production using cryogenic oxygen distillation

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1960-1966页

作者： meysam Akbarian Shourkaei Abbas Rashidi Javad karimi-Sabet Faculty of Engineering University of Mazandaran Material and Nuclear Fuel Research School (MNFRS) Nuclear Science and Technology Research Institute

In this study, life cycle assessment of oxygen-18 by using cryogenic distillation of oxygen is performed using SimaPro 8.3 software. Life cycle assessment is performed to understand the environmental profile and hotspots of this process in order to be used in design and development. Simulation of oxygen-18 process is executed by Hysys software, and the required inputs and outputs for inventory of life cycle were acquired. By doing life cycle assessment and considering achieved results after characterization and normalization of inventory data it has been investigated that in the majority of environmental impacts electricity consumption has a huge contribution relative to other parts of the system like liquefied oxygen production from air separation unit,required facilities for air separation and oxygen-18 units, and needed transportation. Also, among 17 impact categories investigated in ReCiPe impact assessment method, fossil depletion, climate change(human health),particulate matter formation, climate change(ecosystem), human toxicity, and metal depletion have the most contribution in entire environmental loads respectively. Furthermore, sensitivity analysis showed that changing life cycle impact assessment method from ReCiPe to IMPACT 2002+ has no significant effect on acquired results and results are confident. In addition, assumption of market for depleted oxygen from heavy isotopes which is withdrawn from top of distillation columns showed some positive effects compared to first case and environmental impacts resulted from liquefied oxygen production(feed) reduced but because of huge contribution of electricity consumption compared to other sections, this positive effect has no remarkable influence on entire environmental loads of product system.

关键词： Life cycle assessment Oxygen- 18 production Cryogenic distillation Isotope separation

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