Search for: interfacial-tension
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    Determination of hydrocarbon-water interfacial tension using a new empirical correlation

    , Article Fluid Phase Equilibria ; Volume 415 , 2016 , Pages 42-50 ; 03783812 (ISSN) Kalantari Meybodi, M ; Daryasafar, A ; Karimi, M ; Sharif University of Technology
    Elsevier  2016
    Interfacial tension is one of the very important parameters in pharmacology science, chemical engineering and petroleum engineering. The interfacial tension between pure hydrocarbons and water is widely used in chemical and petroleum engineering and so that it is highly desirable to find its accurate values. In this study a new unique correlation has been developed based on a comprehensive database of pure hydrocarbons-water interfacial tension values which contained both aliphatic and aromatic compounds (32 different hydrocarbons) with pressure ranges of 0.1-300 MPa and temperature ranges of 252.44-550 K. The proposed correlation uses the density difference between pure hydrocarbon and... 

    "Bubble bunch" phenomenon in operation of a bubble column

    , Article Central European Journal of Chemistry ; Volume 7, Issue 4 , 2009 , Pages 803-808 ; 18951066 (ISSN) Bastani, D ; Baghaei, A ; Sarrafi, A ; Sharif University of Technology
    While studying the operation of a rectangular bubble column in laboratory scale, it was observed that under certain circumstances tiny bubbles attach to larger bubbles without causing them to coalesce. In other words, bubbles with large diameters (d > 5 mm) swept tiny bubbles (d < 1 mm) in their way to the top of the column resulting in grapelike clusters of bubbles. This phenomenon was named "bubble bunch" by us and its effect on total gas holdup and interfacial area was discussed. Although it was found to have almost no affect on gas holdup, bubble bunch can increase the interfacial area up to 10% more than what is anticipated in the literature. The process of film thinning was modeled for... 

    Simulation study of the Gachsaran asphaltene behavior within the interface of oil/water emulsion: a case study

    , Article Colloids and Interface Science Communications ; Volume 33 , 2019 ; 22150382 (ISSN) Saeedi Dehaghani, A. H ; Soodbakhsh Taleghani, M ; Badizad, M. H ; Daneshfar, R ; Sharif University of Technology
    Elsevier B.V  2019
    Molecular dynamics (MD) simulation was utilized to study the role of asphaltene extracted from Gachsaran (an Iranian oilfield) at the synthetic oil-water interface. In agreement with experimental data, IFTs predicted by MD simulation for heptol/brine system showed a minima at around 50 vol.% n-heptane, reflecting the highest contribution of asphaltene into the interface. At greater n-heptane fractions, IFT was increased steadily. Simulation results suggest the asphaltene propensity for remaining in the bulk heptol phase rather related to the fraction of toluene in the mixture. Heptol ingredients, i.e., toluene and heptane, act differently with respect to asphaltene, where former tends to... 

    Investigation of the Effect of Asphaltene on Interfacial Tension Behavior of CO2/Oil Systems during CO2 Injection into Asphaltenic Oil Reservoirs

    , M.Sc. Thesis Sharif University of Technology Mahdavi, Ehsan (Author) ; Taghikhani, Vahid (Supervisor) ; Ayatollahi, Shahabeddin (Supervisor)
    Interfacial Tension (IFT) behavior of crude oil/CO2 system is recognized as the main factor affecting the efficiency of CO2 flooding during enhanced oil recovery (EOR) process. Adding paraffin group hydrocarbon to asphaltenic crude oils as an asphaltene precipitant component is aimed to mimic asphaltene precipitation process during crude oil production and transportation. Asphaltene precipitation would critically effects the IFT behavior of crude oil/CO2 systems. In the first part of this study, the equilibrium densities of oil samples which contain different heptane ratio were measured at different pressures and the temperature of 323 K. Then, the equilibrium IFT between CO2 and the crude... 

    Temperature and composition effect on CO2 miscibility by interfacial tension measurement

    , Article Journal of Chemical and Engineering Data ; Volume 58, Issue 5 , March , 2013 , Pages 1168-1175 ; 00219568 (ISSN) Zolghadr, A ; Escrochi, M ; Ayatollahi, S ; Sharif University of Technology
    Crude oil reservoirs have different temperatures, compositions, and pressures, therefore oil recovery performance by CO2 injection varies from one case to another. Furthermore, it is predicted that lower interfacial tension between injected CO2 and reservoir fluid results in more oil recovery. In this study, we investigate the effect of temperature on the equilibrium interfacial tension between CO2 and three different oil fluids at different pressures. Also minimum miscible pressure (MMP) is measured by the vanishing interfacial tension (VIT) technique to determine the temperature effect on the CO2 miscible gas injection. The results on different pure and mixtures of hydrocarbon fluids show... 

    Investigation the Optimum Condition for Gas Injection into the Oil Reservoirs by Measuring the Interfacial Tension

    , M.Sc. Thesis Sharif University of Technology Roham, Mohammad (Author) ; Ghotbi, Cyrus (Supervisor) ; Robert, Marc (Supervisor) ; Taghikhani, Vahid (Supervisor)
    Interfacial Tension (IFT) as a main parameter for gas flooding efficiency in oil reservoirs depends highly on pressure, temperature, and composition of the reservoir fluids. Therefore, it is important to measure this parameter at real reservoir condition for successful field development plan. In this study, an axisymmetric drop shape analysis (ADSA) has been utilized to measure the equilibrium IFTs in crude oil-flue gas systems at different temperatures and pressures. Moreover, minimum miscibility pressures (MMP) of crude oil/flue gas and crude oil/N2 systems at different temperature levels are determined by applying vanishing interfacial tension (VIT) technique. Then, the effect of oil... 

    Calculation of Interfacial Tension in Water-Methane System at High Pressures Using Molecular Simulation

    , M.Sc. Thesis Sharif University of Technology Salami, Hossein (Author) ; Ghotbi, Cyrus (Supervisor) ; Taghikhani, Vahid (Supervisor) ; Robert, Marc (Supervisor)
    Interfacial tension has wide application in surface engineering and specially oil and gas industry. One has to do work to transfer a molecule from bulk to the surface of a fluid. The amount of this work is proportional to Interfacial tension.Molecular simulation is a fundumental approach for calculating the thermophisycal properties of matter such asInterfacial tension.In this thesis we have investigated the effect of pressure and temperature on surface tension of pure water and interfacial tension of Water-Methane system. The TIP4P potential model was used for Water molecules and OPLS for Methane molecules. In the first part, Water heat capacity and Methane density were calculated for... 

    Effect of water salinity on oil/brine interfacial behaviour during low salinity waterflooding: A mechanistic study

    , Article Petroleum ; Volume 5, Issue 4 , 2019 , Pages 367-374 ; 24056561 (ISSN) Rostami, P ; Fattahi Mehraban, M ; Sharifi, M ; Dejam, M ; Ayatollahi, S ; Sharif University of Technology
    KeAi Communications Co  2019
    In recent years, controlling the salinity and composition of the injected water has become an emerging enhanced oil recovery (EOR) technique, often described as low salinity (LS) waterflooding. This work is done with the intention to contribute to the ongoing discussions about LS waterflooding mechanism(s). For this purpose, a series of different experiments were conducted. At first, the effect of salinity on the interfacial tension (IFT) and the contact angle was evaluated with a crude oil sample. Then to achieve more accurate results in observing oil/water interface, similar IFT experiments were also carried out on a synthetic oil containing asphaltenes. Thereafter, microscopic... 

    The role of CO2 and ion type in the dynamic interfacial tension of acidic crude oil/carbonated brine

    , Article Petroleum Science ; Volume 16, Issue 4 , 2019 , Pages 850-858 ; 16725107 (ISSN) Lashkarbolooki, M ; Zeinolabedini Hezave, A ; Ayatollahi, S ; Sharif University of Technology
    China University of Petroleum Beijing  2019
    The effects of CO2 and salt type on the interfacial tension (IFT) between crude oil and carbonated brine (CB) have not been fully understood. This study focuses on measuring the dynamic IFT between acidic crude oil with a total acid number of 1.5 mg KOH/g and fully CO2-saturated aqueous solutions consisting of 15,000 ppm of KCl, NaCl, CaCl2 and MgCl2 at 30 °C and a wide range of pressures (500–4000 psi). The results of IFT measurements showed that solvation of CO2 into all the studied aqueous solutions led to an increase in IFT of acidic crude oil (i.e., comparison of IFT of crude oil/CB and crude oil/brine), while no significant effect was observed for pressure. In contrast, the obtained... 

    Experimental investigation of asphaltene content effect on crude oil/co2 minimum miscibility pressure

    , Article Periodica Polytechnica Chemical Engineering ; Volume 64, Issue 4 , 2020 , Pages 479-490 Ghorbani, M ; Gandomkar, A ; Montazeri, G ; Honarvar, B ; Azdarpour, A ; Rezaee, M ; Sharif University of Technology
    Budapest University of Technology and Economics  2020
    Minimum Miscibility Pressure (MMP) is regarded as one of the foremost parameters required to be measured in a CO2 injection process. Therefore, a reasonable approximation of the MMP can be useful for better development of injection conditions as well as planning surface facilities. In this study, the impact of asphaltene content ranging from 3.84 % to 16 % on CO2/heavy oil MMP is evaluated. In this respect, slim tube miscibility and Vanishing Interfacial Tension (VIT) tests are used. Regarding the VIT test, the Interfacial Tension (IFT) is measured by means of two methods including pendant drop and capillary apparatuses, and thereafter the MMP measurement error between slim tube and VIT... 

    Experimental and CFD Study of Physical Properties Effect on Hydrodynamic and Mass Transfer Coefficient of Single Drops

    , M.Sc. Thesis Sharif University of Technology Davari Moghaddam, Abbas (Author) ; Bastani, Daruoosh (Supervisor)
    In present study, it is tried to investigate the effect of physical properties on hydrodynamic and overall mass transfer coefficient of single drops using different experiments and then simulation of drop motion with OpenFOAM software version 1.7.1. the systems were choosen are toluene/acetone/water and n-butanol/succinic acid/water which their interfacial tensions are 36 and 1.6 mN/m respectively. Various type of nozzles have been used for produce of 1.5, 2, 3 and 4 millimeter drops. The results show that in absence of solute component, the rising velocity of toluene drops in each size is higher than rising velocity of butanol drops inside the water between 25 to 75 percent. But with... 

    Oil-Gas MMP Determination in Enhanced Oil Recovery Methods by Experimental Method of Vanishing Interfacial Tension

    , M.Sc. Thesis Sharif University of Technology Fathinasab, Mohammad (Author) ; Taghikhani, Vahid (Supervisor) ; Ayatollahi, Shahabodin (Supervisor)
    Minimum miscibility pressure (MMP) is a key parameter for successful gas injection process in the oil reservoirs for more oil recovery. This parameter is critically dependent on the reservoir condition such as temperature, reservoir and injection gas composition. There are many techniques used in the literature for MMP measurement. Vanishing interfacial tension (VIT) has been proposed recently and was used successfully to predict the MMP through pendant drop technique. This technique is used in this study to measure the MMP for Nitrogen/Carbon dioxide and water in oil emulsion fluids; then compare it to the original crude oil without water droplets. This would demonstrate the effects of... 

    Investigation the Minimum Miscibility Pressure for Crude oil with Different Asphaltene Content using Vanishing Interfacial Tension Method

    , M.Sc. Thesis Sharif University of Technology Hemmati-Sarapardeh, Abdolhossein (Author) ; Ayatollahi, Shahab (Supervisor) ; Masihi, Mohsen (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Interfacial Tension (IFT) as a main parameter for gas flooding efficiency in oil reservoirs depends highly on pressure, temperature, and composition of the reservoir fluids. Therefore, it is important to measure this parameter at real reservoir condition for successful field development plan. In this study, an axisymmetric drop shape analysis (ADSA) has been utilized to measure the equilibrium IFTs in crude oil-CO2 as well as crude oil-N2 systems at different temperatures and pressures. Moreover, minimum miscibility pressures (MMP) and first-contact miscibility pressures (Pmax) of crude oil/CO2 and crude oil/N2 systems at different temperature levels are determined by applying vanishing... 

    Experimental Study of Improved Oil Recovery by Low-Salinity Waterflooding in Asphaltenic Reservoirs

    , M.Sc. Thesis Sharif University of Technology Rashid, Saeed (Author) ; Ayatollahi, Shahaboddin (Supervisor) ; Vosoughi, Manouchehr (Supervisor)
    There is increasing evidence that injecting modified brines has a significant impact on the amount of oil recovered, but the exact mechanism by which this occurs is an unsettled issue, and is supposed to be a cause of the complex interactions occurring between the phases insitu. In this thesis, surface chemistry of smart water has been investigated. Fluid/solid and fluid/fluid interactions for Bangestan crude oil in tfhe presence of designed solutions and a set of dilutions of Persian Gulf seawater have been studied and compared. Fluid/solid interactions were investigated through wettability studies. Impact of salinity and ionic composition on this interaction was measured through contact... 

    Microorganisms Effects on Interfacial Tension and Wettability During Smart Water Injection in Oil Reservoirs

    , M.Sc. Thesis Sharif University of Technology Jahanbani Veshareh, Moein (Author) ; Ayatollahi, Shahabodin (Supervisor) ; Massihi, Mohsen (Supervisor)
    This research was done for feasibility evaluation and understanding correct microbial enhanced oil recovery(MEOR) procedure for carbonate reservoirs. With the aim of cost reduction and possible activation of smart water mechanisms, sea water used as a base for MEOR process. Two biosurfactant producing strains were isolated from oil contaminated water and soil, and one halotolerant strain, from sea water. Optimization of biosurfactant yield was conducted and two new definitions for optimum point, by considering economical and technical facts, were proposed. Partial characterization of produced biosurfactant was carried out through FTIR and NMR analysis and the produced biosurfactant was... 

    Investigation of the IFT Behavior of Foamy Oil or Water in Oil Emulsions at Reservoir Condition in Water Based EOR Techniques

    , M.Sc. Thesis Sharif University of Technology Mousapour, Mohammad Sadegh (Author) ; Ayatollahi, Shahabedin (Supervisor) ; Taghikhani, Vahid (Supervisor)
    Foamy oil reservoirs and reservoirs which have water in oil emulsions have some difficulties through production with water based enhanced oil recovery techniques. Study of IFT of these oils may improve production of these reservoirs, especially for water based techniques which are most popular techniques. In this study, IFT of these oils were studied in reservoir condition. Effects of pressure, temperature and water composition were investigated. These effects were studied through Pendant drop technique and VIT apparatus  

    An Experimental Study of Oil Production under Spontaneous Co-current Imbibition and Effective Parameters Influencing the Process in Low IFT

    , M.Sc. Thesis Sharif University of Technology Hamidpour, Esmaeil (Author) ; Massihi, Mohsen (Supervisor)
    Capillary Imbibition is an important mechanism in producing oil from matrix blocks in fractured reservoirs. In a water-wet fractured reservoir, if the rise of water level in fracture is in a way that at all the moments the water front in fracture is lower than that in the matrix block we expect co-current imbibition. Iranian reservoirs have large matrix blocks and co-current imbibition can be expectable. Till this time, not many investigations have been done on co-current imbibition in and out of our country, Iran. In this thesis, an experimental investigation on co-current imbibition will be done for different conditions. The main goal of this thesis is the study of co-current imbibition in... 

    Microfluidic Tensiometry and Investigation of Nanoparticles Adsorption at Liquid/Liquid Interfaces

    , M.Sc. Thesis Sharif University of Technology Arvahi, Milad (Author) ; Mohammadi, Ali Asghar (Supervisor)
    The present paper is an attempt to critically measure interfacial tension with microchannels and achieve the quantity of adsorption in the liquid – liquid interfaces and comparing the adsorption of surfactants and nanoparticles surface modificated as well. At this point we need to make emulsion and it is necessary for droplets to be monodispersed due to analyze these droplets in this paper. According to this condition for our droplets microsystems are the best options. As we know surfactants were already known as a stabilizing emulsion agent and in this paper nanoparticles are suggested as suitable alternatives for surfactants which can be absorbed as if they are in the water / oil... 

    Evaluation of the Surface Activity of Novel Ionic Liquids and Their Application in the Enhanced Oil Recovery Process

    , M.Sc. Thesis Sharif University of Technology Hosseinzadeh Semnani, Radman (Author) ; Taghikhani, Vahid (Supervisor) ; Mokhtarani, Babak (Supervisor) ; Baghban Salehi, Mahsa (Co-Supervisor)
    The following dissertation discusses Ionic Liquids (ILs) as an alternative to commercial surfactants for use in the Enhanced Oil Recovery process. Ionic Liquids came to researchers’ attention due to their environmental nature and their tolerance for high temperatures and salinity. In this work, firstly, an extensive literature review is carried out, and then, experiments are designed and performed to evaluate ILs’ surface activity and performance in a lab-scale EOR set-up. The Ionic Liquids used in this work consist of three types of methylimidazolium nitrate, [MIM]+[NO3]-, with three different alkyl chain lengths. This combination, and specifically the effect of nitrate anions on EOR and... 

    Investigation of effects of salinity, temperature, pressure, and crude oil type on the dynamic interfacial tensions

    , Article Chemical Engineering Research and Design ; Volume 115 , 2016 , Pages 53-65 ; 02638762 (ISSN) Lashkarbolooki, M ; Riazi, M ; Ayatollahi, S ; Sharif University of Technology
    Institution of Chemical Engineers  2016
    The main objectives of this study are to determine the influence of crude oil type, salinity, temperature and pressure on the dynamic interfacial tension (DIFT) of crude oil based on the experiments and modeling approaches. DIFT is also modeled using dynamic adsorption models, mono-exponential decay model as well as empirical equations. The results showed that when temperature increases, unlike deionized water which inversion phase temperature was observed, the equilibrium IFT of crude oils/sea water increases due to reduction of surface excess concentration of natural surfactants at the fluid/fluid interface as a dominant mechanism