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- 검색키워드
- 저자 : Arezou Jafari (검색결과 3 건)
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Tohidi Zahra,Jafari Arezou,Omidkhah Mohammadreza 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.4
Nanofl uid injection into oil reservoirs is a novel chemical enhanced oil recovery (EOR) method and has been the subject of many researches in recent years. Despite its increasing applications, there is not enough information on the mechanisms and microscopic aspects of nanoparticle performance in EOR processes. Among nanoparticles, Janus nanoparticles (JNPs), which have two distinct hydrophilic and hydrophobic sides, can play an eff ective role in oil recovery enhancement applications. In the present study, molecular dynamics (MD) simulations were performed to provide a molecular-scale insight into the working mechanisms of silica Janus nanoparticles in oil recovery enhancement by considering the presence of sodium, chlorine, magnesium and sulfate ions. The calcite surface interacts with the mixture of heptane, decane, and toluene as the oil phase. Based on the simulation results, the mechanism of oil detachment from the calcite surface involves several steps. Due to the electrostatic interactions between the nanofl uid and the calcite, the formation of a water channel towards the calcite surface begins, and the nanofl uid reaches and spreads over the calcite surface, which is infl uenced by two factors: hydrogen bonds between water and calcite; the presence of ions in the nanofl uid, which can increase the hydrophilicity of the calcite surface. Thus, the oil molecules remain as a droplet on the rock surface. Subsequently, the JNPs approach to the oil–water interface near the calcite surface and push the oil droplet upward so that the oil phase completely detaches from the surface. The presence of ionic compounds around the JNPs increases their electrostatic interactions with each other and also increases the probability agglomeration of JNPs, which is a negative factor. On the other hand, they increase the electrostatic interactions of JNPs with calcite, which is a positive factor. Therefore, it is necessary to choose the optimal concentration of the ionic compounds in the injected nanofl uid. According to the simulation results, JNPs could increase the viscosity of the water phase by 60% and reduce the surface tension of water–oil by 33%. Under the reservoir temperature and pressure conditions, the diff usion coeffi cient of 1nm JNPs has increased from 3.33 × 10 –10 to 6.67 × 10 –10 m 2 /s. The results of this study may be useful for designing favorable conditions for nanofl uid injection in the EOR applications.
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Reza Gharibshahi,Mohammadreza Omidkhah,Arezou Jafari,Zahra Fakhroueian 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
Microwave (MW) absorption ability of Fe3O4 nanoparticles was increased by attaching NiO nanomaterials to them through a co-precipitation approach. The surface of the synthesized nanohybrids was hydrophilized using three different natural agents to disperse in water. The synthesized nanohybrids were characterized by several analyses. The colloidal stability, magnetic behavior and the effect of surface modification agent on the MW absorption ability of the synthesized nanohybrids were investigated. The ability of surface-modified nanohybrids to increase the oil recovery factor was studied by injecting them into a 2D glass micromodel as the porous medium. The results showed that CA is the best modification agent with high colloidal stability, strong MW absorption and the lowest effect on the reduction of magnetic saturation of uncoated nanohybrids. Citric acid decreased the saturation magnetization from 55.43 emu/gr at the uncoated state to 52.82 emu/gr at the modified state. The oil sample with more polar compounds such as asphaltene could be further heated and its viscosity further reduced in an EM heating process. By adding 0.1 wt% of the Fe3O4-NiO nanohybrids, the viscosity of sample (S1) was reduced by 266mPa·s more than the MW radiation state alone. The findings indicate that MW radiation can significantly increase the heavy oil recovery factor. Water injection had only 16.6% oil recovery; however, this value increased to 41.5% by radiating 400 watts MW. This increase will be further enhanced by adding modified Fe3O4-NiO nanohybrids to water. The Fe3O4-NiO @ CA, Fe3O4- NiO @ APTES, and Fe3O4-NiO @ PEG had 69%, 63.5%, and 58.3% oil recovery, respectively. Finally, it was found that the surface modified nanohybrids could change the wettability of the porous medium from oil-wet to water-wet. After coating the glass with the Fe3O4-NiO @ CA nanofluid, the oil contact angle decreased from 140o to 17o.
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Viscosity reduction of extra-heavy crude oil using nanocatalysts
Seyed Amir Sabet,Mohammadreza Omidkhah,Arezou Jafari 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
Exploiting extra-heavy crude oil and converting it to operational products is considered a challenging processin the industry due to the difficulty in processing this kind of crude oil. So, in the present study, viscosity reductionof extra-heavy crude oil is inquired using nanocatalysts. This is the first study that investigates and juxtaposes theresults of viscosity reduction of extra-heavy crude oil based on direct heating and microwave radiation as the indirectheating source at the presence of ZSM-5 catalyst as well as silica, clay, and synthesized nickel oxide nanocatalysts inorder to facilitate the process of extra-heavy crude oil upgrading. The results illustrate that nanocatalysts have a fundamentalimpact on the viscosity reduction of extra-heavy crude oil. According to the findings, nanosilica represents thebest efficiency among others as it makes a 98.3% reduction in the extra-heavy crude oil viscosity. Besides, the applicationof microwave radiation in the upgrading of extra-heavy crude oil leads to an incredible reaction duration reduction asapproximately 60% of sample oil viscosity is reduced in just 90 seconds. Analysis of upgraded oil reveals that addingexcess nanocatalyst to the extra-heavy crude oil actuates an efficiency reduction due to the agglomeration of nanoparticles. Finally, the findings offer appealing information for the enhancement of upgrading processes in the industry.
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