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Experimental study on using SiO_(2) nanoparticles along with surfactant in an EOR process in micromodel

Petroleum Research 2019年第1期4卷 59-70页

作者： Mahdi Mohajeri Mohammad Reza Rasaei mahnaz hekmatzadeh Department of Petroleum and Chemical Engineering Science and Research BranchIslamic Azad UniversityTehranIran Institute of Petroleum Engineering University of TehranTehranIran

Surfactant flooding is a common chemical method for enhancing oil ***,the simultaneous application of nanoparticles and chemical substances has been considered for improving the efficiency of EOR *** the present study,the microscopic and macroscopic efficiency of oil recovery in a linear micromodel in three injection cases of Sodium dodecyl sulfate(SDS)as an anionic surfactant,SiO_(2) nanoparticles,and simultaneous injection of nanoparticles and surfactant was *** our study,adding the nanoparticles along with SDS(2000 ppm)decreased Interfacial tension by 84%,while the figure was 74%and only 10%when the surfactant and the nanoparticles were used alone,***,although the nanoparticles alone could not reduce IFT values,adding them to surfactant solution could strongly decrease the interfacial tension between oil and water,leading to enhancement of oil ***,our findings showed that an optimum concentration of nanoparticles in surfactant solution must be *** this regard,in low concentrations of nanoparticles,they were attached to the interface and IFT decreased due to absorption ***,in high concentrations,nanoparticles removed the surfactant from aqueous phase resulting in no free surfactant available in the ***,surfactant effectiveness in reducing IFT and alteration wettability decreased,and as a consequence,oil recovery efficiency dropped compared to lower nanoparticles’***,the results of sessile drop experiments and wettability measurements revealed that coating with either the surfactants or the nanoparticles could partially alter the wettability of surface to water-wet,while coating with the surfactants along with the nanoparticles could make a strongly water-wet ***,investigating the microscopic images of pores and throats showed a strong water-wet condition when the surfactant along with the nanoparticles was *** addition,the result

关键词： SiO_(2)nanoparticle EOR IFT value Surfactant solution Wettability Micro-emulsions

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Evaluation of gas condensate reservoir behavior using velocity dependent relative permeability during the numerical well test analysis

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Petroleum 2016年第2期2卷 156-165页

作者： Arash Azamifard mahnaz hekmatzadeh Bahram Dabir Amirkabir University of Technology Tehran Polytechnic424 Hafez AveTehranIran IOR Research Inistitute National Iranian Oil CompanyTehranIran

Gas condensate is one of the most different fluids in reservoir simulation due to retrograde condensation in case of pressure *** this kind of fluids,two phenomena named negative inertia and positive coupling,become significant in the high velocity zone around the *** this study,a modified black oil simulator is developed that take into account the velocity dependent relative *** the industrial simulator that assumes linear variation of transmissibilities by pressure,modified black oil nonlinear equations are solved directly without *** developed code is validated by ECLIPSE *** behavior of two real gas condensate fluids,a lean and a rich one,are compared with each *** each fluid,simulations of PVT experiments are carried out to calculate black oil property applying Coats approach for gas condensate *** both fluids,the proposed models for gas condensate velocity dependent relative permeability show different influence of velocity on relative permeability in the same ***,it is observed that higher flow rate of gas production leads to more condensate production during constant rate well testing.

关键词： Gas condensate Velocity dependent relative permeability Modified black oil simulation Numerical well testing

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