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    The impact of silica nanoparticles on the performance of polymer solution in presence of salts in polymer flooding for heavy oil recovery

    , Article Fuel ; Vol. 123 , May , 2014 , pp. 123-132 ; ISSN: 00162361 Maghzi, A ; Kharrat, R ; Mohebbi, A ; Ghazanfari, M. H ; Sharif University of Technology
    Abstract
    Due to role of polymer in increasing sweep efficiency during oil recovery, much attention has been paid to the using polymer solutions in enhanced oil recovery methods. In spite of the existence of the great researches in this area, the role of nanoparticles in modification of the polymer performance in the presence of salts has not been examined before. Furthermore, there is no information about how the dispersed silica nanoparticles affect the heavy oil recovery during the polymer flooding in the presence of divalent cations. In this study, a series of polymer flooding experiments are performed in a quarter five-spot glass micromodel saturated with heavy oil. Solutions of polyacrylamide... 

    Cover picture: Nanostructured particles for controlled polymer release in enhanced oil recovery (energy technol. 9/2016)

    , Article Energy Technology ; Volume 4, Issue 9 , 2016 , Pages 1029- ; 21944288 (ISSN) Tamsilian, Y ; Ramazani S., A ; Shaban, M ; Ayatollahi, S ; de la Cal, J. C ; Sheng, J. J ; Tomovska, R ; Sharif University of Technology
    Wiley-VCH Verlag  2016
    Abstract
    Abstract original image Smart Enhanced Oil Recovery Process using Core–Shell Nanoparticles: The cover image denotes schematically the enhanced oil recovery process by flooding using an aqueous dispersion of core–shell nanoparticles made up of protected polyacrylamide nanostructures (PPNs). Y. Tamsilian and his colleagues at Sharif University of Technology (Iran) and the Institute for Polymer Material (POLYMAT, Spain) demonstrated the synthesis of polyacrylamide nanoparticles protected with a hydrophobic polystyrene shell by using a one-pot, two-step inverse emulsion polymerization technique, where the polystyrene shell was created by surface polymerization. The presence of the hydrophobic... 

    Effect of magnetic field treatment on interfacial tension of CTAB nano-emulsion: developing a novel agent for enhanced oil recovery

    , Article Journal of Molecular Liquids ; Volume 261 , July , 2018 , Pages 107-114 ; 01677322 (ISSN) Saeedi Dehaghani, A. H ; Badizad, M. H ; Sharif University of Technology
    Elsevier B.V  2018
    Abstract
    Nanoemulsion is a novel type of emulsified solutions holding great promises for utilizing in industrial applications. Although microemulsions have been the subject of numerous studies in past decades, however, nanoemulsions are quite virgin and merit detailed investigation to scrutinize their characteristics specific to reservoir engineering, in particular, Enhanced Oil Recovery (EOR). To this end, the present study is an attempt to evaluate the effectiveness of a specific nanoemulsion for oil displacement through porous media. In this regard, flooding experiments were designed and Hexa decyl trimethylammonium bromide (CTAB), which is a cationic surfactant, was used as the emulsifying agent.... 

    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)
    Abstract
    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... 

    A Simulation study of CO2 flooding for EOR and sequestration in bottom water-driven reservoir

    , Article Environmental Engineering and Management Journal ; Volume 11, Issue 4 , April , 2012 , Pages 747-752 ; 15829596 (ISSN) Ghoodjani, E ; Bolouri, S. H ; Sharif University of Technology
    2012
    Abstract
    CO2 flooding has been recognized widely as one of the most effective enhanced oil recovery (EOR) technologies for reducing greenhouse emissions while increasing the ultimate recovery of oil reservoirs. Because of the wide variety of parameters that can influence, the outcome of CO2 storage projects reservoir simulation has gained wide popularity. In this study, a fully compositional reservoir simulation model was used to simulate various operational conditions, reservoir properties and fluid composition, and their effects on the amount of CO2 stored and oil recovered. The results can be used for selection of best reservoir candidates for carbon storage and optimization of operational... 

    Neural Network Meta-Modeling of Steam Assisted Gravity Drainage Oil recovery processes

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 29, Issue 3 , Summer , 2010 , Pages 109-122 ; 10219986 (ISSN) Najeh, A ; Pishvaie, M. R ; Vahid, T ; Sharif University of Technology
    2010
    Abstract
    Production of highly viscous tar sand bitumen using Steam Assisted Gravity Drainage (SAGD) with a pair of horizontal wells has advantages over conventional steam flooding. This paper explores the use of Artificial Neural Networks (ANNs) as an alternative to the traditional SAGD simulation approach. Feed forward, multi-layered neural network meta-models are trained through the Back-Error-Propagation (BEP) learning algorithm to provide a versatile SAGD forecasting and analysis framework. The constructed neural network architectures are capable of estimating the recovery factors of the SAGD production as an enhanced oil recovery method satisfactorily. Rigorous studies regarding the hybrid... 

    Copper oxide nano-fluid stabilized by ionic liquid for enhancing thermal conductivity of reservoir formation: Applicable for thermal enhanced oil recovery processes

    , Article Chemical Industry and Chemical Engineering Quarterly ; Volume 22, Issue 2 , 2016 , Pages 211-225 ; 14519372 (ISSN) Barahoei, M ; Hezave, A. Z ; Sabbaghi, S ; Ayatollahi, S ; Sharif University of Technology
    CI and CEQ  2016
    Abstract
    Since oil reservoirs are limited and energy demand is increasing, seeking for high efficient EOR processes or enhancing the efficiency of current proposed EOR methods for producing trapped oil from reservoirs are highly investigated. As a way out, it is possible to couple the EOR and nanotechnology to utilize the efficiency of both methods together. Regarding this possibility, in the present study, in the first stage of investigation stable and uniform water-based solution of nano-sized particles of copper oxide with different concentrations (0.01–0.05 M) were prepared and then injected into the core samples. In the first stage, the effects of different surfactants with respect to their... 

    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
    Abstract
    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... 

    Pore-scale investigation of selective plugging mechanism in immiscible two-phase flow using phase-field method

    , Article Oil and Gas Science and Technology ; Volume 74 , 2019 ; 12944475 (ISSN) Sabooniha, E ; Rokhforouz, M. R ; Ayatollahi, S ; Sharif University of Technology
    Editions Technip  2019
    Abstract
    The selective plugging effect of hydrophobic bacteria cell on secondary oil recovery performance was investigated. Water and aqua solution of purified Acinetobacter strain RAG-1 were injected into an oil-saturated heterogeneous micromodel porous media. Pure water injection expelled oil by 41%, while bacterial solution injection resulted in higher oil recovery efficiency (59%). In the simulation section, a smaller part of the heterogeneous geometry was applied as a computational domain. A numerical model was developed using coupled Cahn-Hilliard phase-field method and Navier-Stokes equations, solved by a finite element solver. In the non-plugging model, approximately 50% of the matrix oil was... 

    Technical and Economical Potential for Application of Solar Energy in Enhanced Oil Recovery

    , M.Sc. Thesis Sharif University of Technology Najafi, Homayoun (Author) ; Ayatollahi, Shahabodin (Supervisor) ; Soltanieh, Mohammad (Supervisor)
    Abstract
    In this thesis, the application of solar energy in the steam injection as a thermal enhanced oil recovery (TEOR) is evaluated. The motivations of this project are using a renewable energy, suitable solar potential of Iran, successful experience in the world, undeveloped heavy oilfield reservoirs in Iran. This application is investigated by three aspects which are:Reservoir Engineering aspect: the heavy oilfield are determined and then screening for selection good candidate of steam injection are done. One of the reservoirs is analyzed by simulation and optimization the steam injection to determine how much it’s production will be improved by using steam injection (contionous and cyclic)... 

    The simulation of microbial enhanced oil recovery by using a two-layer perceptron neural network

    , Article Petroleum Science and Technology ; Vol. 32, Issue. 22 , 2014 , pp. 2700-2707 ; ISSN: 10916466 Morshedi, S ; Torkaman, M ; Sedaghat, M. H ; Ghazanfari M.H ; Sharif University of Technology
    Abstract
    The authors simulated a reservoir by using two-layer perceptron. Indeed a model was developed to simulate the increase in oil recovery caused by bacteria injection into an oil reservoir. This model was affected by reservoir temperature and amount of water injected into the reservoir for enhancing oil recovery. Comparing experimental and simulation results and also the erratic trend of data show that the neural networks have modeled this system properly. Considering the effects of nonlinear factors and their erratic and unknown impacts on recovered oil, the perceptron neural network can develop a proper model for oil recovery factor in various conditions. The neural networks have not been... 

    New surfactant extracted from Zizyphus Spina-Christi for enhanced oil recovery: Experimental determination of static adsorption isotherm

    , Article Journal of the Japan Petroleum Institute ; Volume 56, Issue 3 , 2013 , Pages 142-149 ; 13468804 (ISSN) Safian Boldaji, M ; Shahri, M. P ; Zargartalebi, M ; Arabloo, M ; Sharif University of Technology
    2013
    Abstract
    A fundamental chemical enhanced oil recovery (EOR) process is surfactant flooding in which the key mechanism is to reduce interfacial tension between oil and the displacing fluid and hence mobilizing the trapped oil. Surfactant loss by adsorption is one of the most important criteria that governs the economics of the surfactant flooding methods. In addition to this, detrimental effects and high price of currently used surfactants cause EOR process so expensive and unfeasible. This study is aimed to introduce a novel kind of plant based surfactant which is extracted from Zizyphus Spina-Christi tree. In addition, equilibrium adsorption behavior of this novel biosurfactant in aqueous solution... 

    Experimental analysis of secondary gas injection strategies

    , Article Petroleum Science and Technology ; Volume 31, Issue 8 , 2013 , Pages 797-802 ; 10916466 (ISSN) Heidari, P ; Alizadeh, N ; Kharrat, R ; Ghazanfari, M. H ; Laki, A. S ; Sharif University of Technology
    2013
    Abstract
    CO2 injection is a potentially viable method of enhanced oil recovery for medium oil reservoirs. The authors compare the effect of gas injection strategy (simultaneous water-alternating gas [SWAG], water-alternating gas [WAG], and continuous gas injection [CGI]) on recovery in immiscible, near-miscible, and miscible modes of injection. It has been proved that CGI is not the most efficient injection scenario in oil-wet reservoirs. Miscible and near-miscible core flood tests demonstrated high oil recoveries in all injection strategies due to high capillary numbers achieved as a result of miscibility. The fluid mechanics of floods were discussed using pressure drop data, different mechanics was... 

    Isolation and screening of Bacillus subtilis MJ01 for MEOR application: biosurfactant characterization, production optimization and wetting effect on carbonate surfaces

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 9, Issue 1 , 2019 , Pages 233-245 ; 21900558 (ISSN) Jahanbani Veshareh, M ; Ganji Azad, E ; Deihimi, T ; Niazi, A ; Ayatollahi, S ; Sharif University of Technology
    Springer Verlag  2019
    Abstract
    The bacterial strain MJ01 was isolated from stock tank water of one of the Iranian south oil field production facilities. The 16S rRNA gene of isolate, MJ01, showed 99% similarity to Bacillus subtilis. The results revealed that biosurfactant produced by this strain was lipopeptide-like surfactin based on FTIR analysis. Critical micelle concentration of produced surfactin in distilled water was 0.06 g/l. Wettability study showed that at zero salinity surfactin can change original oil-wet state to water-wet state, but in seawater salinity it cannot modify the wettability significantly. To utilize this biosurfactant in ex situ MEOR process, economical and reservoir engineering technical... 

    Using SiO2¬ Nano Particles in Enhanced Oil Recovery Process

    , M.Sc. Thesis Sharif University of Technology Ghajari, Zeinab (Author) ; Alemzadeh, Iran (Supervisor) ; Vossoughi, Manoochehr (Supervisor)
    Abstract
    After primary and secondary recovery processes more than 50 percent of oil remains in reservoirs. Therefore for more recovery from these reservoirs, methods of enhanced oil recovery should be applied.In this paper the effect of nanoparticles of SiO2 in size of 14 nm, on wettability is investigated. Using this nanoparticle, the wettability of carbonate rock in reservoirs could be changed and alter from oil-wet or mix-wet to water-wet. To assess this, hydrophilic changes of sandstone core and carbonate core are studied using the contact angle test. The same test is done on the carbonate core saturated with brine and oil that had received injection with brine and nanoparticles of SiO2 with two... 

    Synthesis and Characterization of TiO2 Nanoparticles for Enhanced Oil Recovery Applications

    , Ph.D. Dissertation Sharif University of Technology Ehtesabi, Hamide (Author) ; Taghikhani, Vahid (Supervisor) ; Ahadian, Mohammad Mahdi (Supervisor) ; Vosoughi, Manouchehr (Co-Advisor)
    Abstract
    Enhanced oil recovery (EOR) techniques are gaining more attention worldwide as the proved oil is declining and the oil price is hiking. Although many giant oil reservoirs around the world were already screened for EOR processes, the main challenges such as low sweep efficiency, costly techniques, possible formation damages, transportation of huge amounts of EOR agents to the fields especially for offshore cases and the lack of analyzing tools in traditional experimental works, hinder the proposed EOR process.It has been shown that recently, nanoparticles are attractive agents to enhance the oil recovery at the laboratory scale.
    In this study TiO2 nanoparticles were used to improve... 

    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)
    Abstract
    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... 

    Investigating Wettability Alteration During MEOR Process

    , M.Sc. Thesis Sharif University of Technology Soleymani, Fatemeh (Author) ; Ayatollahi, Shahab (Supervisor) ; Kariminia, Hamid Reza (Supervisor)
    Abstract
    Microbial enhanced oil recovery (MEOR) is a collection of techniques that utilize microorganisms and their metabolic products to improve the recovery of crude oil from reservoir rock. From the advantages of this method, independency to the oil price and environmental benign can be mentioned. Many mechanisms have been proposed to contribute on MEOR, but still there is no enough knowledge about the mechanisms that causes inabilities in manipulating the process to get more oil production.
    In the present study, the effect of a native type of bacteria, Enterobacter cloacae, on the glass surfaces wettability which were aged in expose of model oil with different asphaltene concentration was... 

    EOR Screening in Fractured Reservoirs Using Artificial Intelligence Technique

    , M.Sc. Thesis Sharif University of Technology Eghbali, Sara (Author) ; Ayatollahi, Shahabaldin (Supervisor) ; Bozormehry, Ramin (Supervisor)
    Abstract
    Part1: Since conventional production has continued to fall, oil Production through EOR processes will supply an increasing percentage of the world’s oil demand in future years. Therefore; the importance of choosing the best recovery method becomes increasingly important to decrease the risk and find the best solution to the oil production decline from matured reservoirs. An expert system whose main task is to recommend the most appropriate EOR method will be described. The proposed expert system is utilized fuzzy logic system to screen four well known EOR methods of miscible 〖CO〗_2 injection, miscible HC gas injection, polymer flooding and steam injection based on reservoir and rock... 

    Pore Scale Experimental Investigation of Increasing the Efficiency of EOR Methods in Heavy Oil Fractured Reservoirs Using Ultrasonic Wave Technology

    , M.Sc. Thesis Sharif University of Technology Seydi, Mahdi (Author) ; Ghotbi, Siroos (Supervisor) ; Ghazanfar, Mohammad Hossein (Co-Advisor) ; Taghikhani, Vahid (Co-Advisor)
    Abstract
    Nowadays, application of ultrasonic wave technology as a novel method of enhancing oil recovery and also gas and oil well stimulation is prevailing. Not only this method is environment friendly, but also it is economic. Although the application of this method is proved to be of outstanding positive influences in field operations. In this study, it is intended to investigate the effect of ultrasonic waves on the rate and final recovery of miscible and immiscible injection of fluids as Enhanced Oil Recovery (EOR) methods by using the Micro model apparatus and Although the effect of the waves on fluid flow through the porous media can be studied. The results of this work are a good guidance to...