Document Detail


Molecular Dynamics Studies of Fluid/Oil Interfaces for Improved Oil Recovery Processes.
MedLine Citation:
PMID:  23163479     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In our paper, we study the interface wettability, diffusivity and molecular orientation between crude oil and different fluids for applications in Improved Oil Recovery (IOR) processes through atomistic Molecular Dynamics (MD). The salt concentration, temperature and pressure effects on the physical chemistry properties of different interfaces between IOR agents [brine (H2O+%NaCl), CO2, N2 and CH4] and crude oil have been determined. From the interfacial density profiles, an accumulation of aromatic molecules near the interface has been observed. In the case of brine interfaced with crude oil, our calculations indicate an increasing in the interfacial tension with increasing pressure and salt concentration, which favors oil displacement. On the other hand, the other fluids studied (CO2, N2 and CH4) the interfacial tension decreases with increasing pressure and temperature. With interfacial tension reduction, an increase in fluid diffusivity in the oil phase is observed. We also studied the molecular orientation properties of the hydrocarbon and fluids molecules in the interface region. We perceived that the molecular orientation could be affected by changes in the interfacial tension and diffusivity of the molecules in the interface region with the increased pressure and temperature: pressure (increasing) → interfacial tension (decreasing) → diffusion (increasing) → molecular ordering. From the molecular point of view, the combination of low interfacial tension and high diffusion of molecules in the oil phase, gives the CO2 molecules unique properties as an IOR fluid compared with other fluids studied here.
Authors:
Lucas Stori de Lara; Mateus F Michelon; Caetano R Miranda
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-19
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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