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    An approach for the estimation of dynamic imbibition capillary pressure curves

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Vol. 36, issue. 9 , Dec , 2010 , p. 1007-1017 ; ISSN: 15567036 Shojaadini Ardakany, M ; Shadizadeh, S.R ; Masihi, M ; Kharrat, R ; Ghazanfari, M. H ; Sharif University of Technology
    Abstract
    Capillary pressure is one of the most important parameters for reservoir engineering studies. Although different experimental methods are devised to measure capillary pressure, these methods do not represent the physics of fluid flow, which happens at reservoir conditions. Thus, it is attempted to extract the capillary pressure from spontaneous imbibition data, the common mechanism of oil production in water wet porous media. In this work, a new approach is developed to obtain the imbibition capillary pressure curve by using spontaneous water imbibition data in oil-water-rock systems. Comparison of calculated imbibition capillary pressure curves by the new approach with experimental values... 

    Reversibility of Asphaltene Aggregation in Live Oils: Qualitative and Quantitative Evaluation

    , Article Journal of Chemical and Engineering Data ; Volume 60, Issue 9 , August , 2015 , Pages 2646-2654 ; 00219568 (ISSN) Mohammadi, S ; Rashidi, F ; Mousavi Dehghani, S. A ; Ghazanfari, M. H ; Sharif University of Technology
    American Chemical Society  2015
    Abstract
    Despite the numerous experimental studies concerning asphaltene, the extent of reversibility of asphaltene aggregation at reservoir conditions remains still an elusive and controversial issue in the available literature. In this work, a series of depressurization and repressurization experiments were performed on three different live oils for qualitative and quantitative evaluation of the reversibility of asphaltene aggregation under typical pressure and temperature conditions of oil fields. The obtained results reveal that the kinetics and the extent of reversibility of asphaltene aggregation at elevated pressure and temperature are majorly controlled by the characteristics of the reservoir... 

    Formation of traveling liquid bridges between matrix blocks: modeling and simulation

    , Article 1st International Petroleum Conference and Exhibition2009 ; 4 May , 2009 Dejam, M ; Masihi, M ; Sharif University of Technology
    European Association of Geoscientists and Engineers, EAGE  2009
    Abstract
    It is widely accepted that under reservoir conditions there exists some degree of block to block interaction that may result in capillary continuity. The formation of liquid bridges causing capillary continuity between blocks will significantly affect ultimate recovery. In this work a mechanistic model with original thought from hydrology for a given steady feeding volumetric flow rate from an upper block (under both gravity and matrix capillary pressure effects) is developed which considers the formation, growth and detachment of pendant liquid droplets perpendicular to the horizontal fracture (assuming to be smooth and parallel walled) between blocks. The length of detached liquid droplet... 

    Experimental investigation of flooding hydrolyzed-sulfonated polymers for EOR process in a carbonate reservoir

    , Article Petroleum Science and Technology ; Vol. 32, issue. 9 , Mar , 2014 , p. 1114-1122 ; ISSN: 10916466 Bamzad, S ; Nourani, M ; Ramazani, A ; Masihi, M ; Sharif University of Technology
    Abstract
    The main purposes of this study were to scrutinize experimentally effects of polymer and rock types on the oil recovery using water and polymer flooding processes. Four dynamic flooding experiments were carried out at simulated reservoir condition of temperature and pressure. According to the obtained results, the ultimate oil recovery by water flooding in highly fractured reservoirs was less than reservoirs with the microfractures. The results of polymer flooding showed that in addition the polymer molecular weight, the sulfonation of polymers also affects the oil recovery  

    Experimental determination of interfacial tension and miscibility of the CO2-crude oil system; Temperature, pressure, and composition effects

    , Article Journal of Chemical and Engineering Data ; Vol. 59, issue. 1 , December , 2014 , p. 61-69 ; ISSN: 00219568 Hemmati-Sarapardeh, A ; Ayatollahi, S ; Ghazanfari, M. H ; Masihi, M ; Sharif University of Technology
    Abstract
    Interfacial tension (IFT) as one of the main properties for efficient CO2 flooding planning in oil reservoirs depends strongly on pressure, temperature, and composition of the reservoir fluids. Therefore, it is important to measure this property at real reservoir conditions for successful field development plan. In this study, an axisymmetric drop shape analysis (ADSA) has been utilized to measure the equilibrium IFTs between crude oil and CO2 at different temperatures and pressures. Moreover, minimum miscibility pressures (MMP) and first-contact miscibility pressures (P max) of crude oil/CO2 systems at different temperatures are determined by applying the vanishing interfacial tension (VIT)... 

    Experimental Investigation on the Effect of Asphaltene Types on the Interfacial Tension of CO2-Hydrocarbon Systems

    , Article Energy and Fuels ; Volume 29, Issue 12 , 2015 , Pages 7941-7947 ; 08870624 (ISSN) Mahdavi, E ; Zebarjad, F. S ; Ayatollahi, S ; Taghikhani, V ; Sharif University of Technology
    American Chemical Society  2015
    Abstract
    Interfacial tension (IFT) is known as the critical parameter affecting the efficiency of CO2 flooding during the enhanced oil recovery (EOR) process. Besides, the asphaltene precipitation phenomenon is reported as the most significant problem during CO2 injection into asphaltenic oil reservoirs. Accordingly, it is important to examine the effect of asphaltene precipitation on the IFT behavior of the oil-CO2 system at reservoir conditions. The main objective of this research work is to study of the effect of asphaltene and its type on the IFT behavior of the oil-CO2 system. The IFT between pure CO2 and a model oil both with and without asphaltene was measured using an axisymmetric drop shape... 

    Experimental investigation on the effect of asphaltene types on the interfacial tension of co2-hydrocarbon systems

    , Article Energy and Fuels ; Volume 29, Issue 12 , November , 2015 , Pages 7941-7947 ; 08870624 (ISSN) Mahdavi, E ; Zebarjad, F. S ; Ayatollahi, S ; Taghikhani, V ; Sharif University of Technology
    American Chemical Society  2015
    Abstract
    Interfacial tension (IFT) is known as the critical parameter affecting the efficiency of CO2 flooding during the enhanced oil recovery (EOR) process. Besides, the asphaltene precipitation phenomenon is reported as the most significant problem during CO2 injection into asphaltenic oil reservoirs. Accordingly, it is important to examine the effect of asphaltene precipitation on the IFT behavior of the oil-CO2 system at reservoir conditions. The main objective of this research work is to study of the effect of asphaltene and its type on the IFT behavior of the oil-CO2 system. The IFT between pure CO2 and a model oil both with and without asphaltene was measured using an axisymmetric drop shape... 

    Application of a mathematical method in calculation of the skin variation during a real field acidizing operation

    , Article Chemical Engineering Science ; Volume 192 , 2018 , Pages 829-839 ; 00092509 (ISSN) Shabani, A ; Jamshidi, S ; Jahangiri, H. R ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    The efficiency of an acidizing operation is usually assessed through ordinary well testing methods. These methods are performed only after the acidizing operation, and it is difficult to monitor and evaluate real-time efficiency of acidizing operation. Understanding the performance of the acidizing during the service, by analysis of the acidizing data is a viable approach to this costly and challenging process. The estimation of the skin changes needs an appropriate mathematical method that can handle the main aspects of an acidizing operation. It is tedious to model a real acidizing operation due to the heterogeneity of the reservoir, an unknown reaction rate of acid in reservoir condition,... 

    Determining influence of different factors on production optimization by developing production scenarios

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 8, Issue 2 , June , 2018 , Pages 505-520 ; 21900558 (ISSN) Izadmehr, M ; Daryasafar, A ; Bakhshi, P ; Tavakoli, R ; Ghayyem, M. A ; Sharif University of Technology
    Springer Verlag  2018
    Abstract
    Production optimization is defined as the process of maximizing oil production over the long term while minimizing total production costs. The overall goal is to achieve the optimum profitability from the well or field. In this process, the reservoir system can be considered as a multiple input–output system. In this complex system injection and production wells are known as inputs and outputs. The output of the system is often affected by various parameters consisting reservoir conditions, petrophysics, and PVT data. The optimization of the injector rates and number and installation of submersible pumps are the main issues which have been studied in this paper. Determining the factor with... 

    Swelling behavior of heavy crude oil during injection of carbonated brine containing chloride anion

    , Article Journal of Molecular Liquids ; Volume 276 , 2019 , Pages 7-14 ; 01677322 (ISSN) Lashkarbolooki, M ; Zeinolabedini Hezave, A ; Ayatollahi, S ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    Carbonated brine (CB) injection, known as one of the effective enhanced oil recovery processes, is highly dependent on the reservoir conditions (i.e. temperature and pressure) as well as the type of dissolved salt in aqueous solution. This study is aimed to investigate the influential parameters on the swelling of crude oil as the most important mechanism during CB injection. The swelling of crude oil in the presence of different CB solutions consisted of different salts such as KCl, NaCl, CaCl2 and MgCl2 with constant concentration of 15,000 ppm is studied using a high-pressure, high-temperature visual cell which measures the volume of drop using image processing software based on... 

    Implementation of SVM framework to estimate PVT properties of reservoir oil

    , Article Fluid Phase Equilibria ; Volume 346 , May , 2013 , Pages 25-32 ; 03783812 (ISSN) Rafiee Taghanaki, S ; Arabloo, M ; Chamkalani, A ; Amani, M ; Zargari, M. H ; Adelzadeh, M. R ; Sharif University of Technology
    2013
    Abstract
    Through this work, a novel mathematical-based approach was proposed to develop reliable models for calculation of PVT properties of crude oils at various reservoir conditions. For this purpose, a new soft computing approach namely Least Square Support Vector Machine (LSSVM) modeling optimized with Coupled Simulated Annealing (CSA) optimization technique was implemented. The constructed models are evaluated by carrying out extensive experimental data reported in open literature. Results obtained by the proposed models were compared with the corresponding experimental values. Moreover, in-depth comparative studies have been carried out between these models and all other predictive models. The... 

    New expert system for enhanced oil recovery screening in non-fractured oil reservoirs

    , Article Fuzzy Sets and Systems ; 2015 ; 01650114 (ISSN) Eghbali, S ; Ayatollahi, S ; Bozorgmehry Boozarjomehry, R ; Sharif University of Technology
    Elsevier  2015
    Abstract
    As the oil production from conventional oil reservoirs is decreasing, oil production through Enhanced Oil Recovery (EOR) processes is supposed to compensate for both the oil production reduction in matured oil reservoirs and the worldwide dramatic increase in oil demand. Therefore, developing a strategy to choose an optimized EOR technique is crucial to find a resolution for production decline in oil reservoirs. A screening tool recommending the most appropriate EOR method is proposed in this study. An expert fuzzy logic system is employed to screen four well-known EOR methods including miscible CO2 injection, miscible HC gas injection, polymer flooding and steam injection based on the... 

    Investigation of asphaltene precipitation in miscible gas injection processes: Experimental study and modeling

    , Article Brazilian Journal of Chemical Engineering ; Volume 29, Issue 3 , 2012 , Pages 665-676 ; 01046632 (ISSN) Moradi, S ; Dabiri, M ; Dabir, B ; Rashtchian, D ; Emadi, M. A ; Sharif University of Technology
    2012
    Abstract
    Asphaltene precipitation during natural depletion and miscible gas injection is a common problem in oilfields throughout the world. In this work, static precipitation tests are conducted to investigate the effects of pressure, temperature and gas type and concentration on asphaltene instability. Three different oil samples have been studied under reservoir conditions with/without nitrogen and methane injection. Besides applying common thermodynamic models, a new scaling equation is presented to predict asphaltene precipitation under HPHT gas injection. Extensive published data from the literature are also used in model development. The scaling approach is attractive because it is simple and... 

    Optimization assisted asphaltene deposition modeling in porous media during a natural depletion scheme

    , Article Petroleum Science and Technology ; Volume 30, Issue 9 , Mar , 2012 , Pages 958-965 ; 10916466 (ISSN) Hematfar, V ; Bagheri, M ; Kharrat, R ; Ghazanfari, M ; Ghotbi, C ; Sharif University of Technology
    2012
    Abstract
    Changes in thermodynamic properties such as pressure, temperature, and composition may result in asphaltene precipitation and deposition in porous media. In addition, asphaltene deposition can cause wettability alteration, permeability reduction, and ultimately a decrease in the productivity of a reservoir. Natural depletion is one of the most common processes of asphaltene deposition in which pressure changes destabilize the dissolved asphaltene in the oil and settle them onto the rock surface. In this work, natural depletion experiments in consolidated core samples were performed under simulated reservoir conditions to obtain reliable data and analyze the asphaltene deposition mechanisms.... 

    Asphaltene deposition during CO 2 injection and pressure depletion: A visual study

    , Article Energy and Fuels ; Volume 26, Issue 2 , December , 2012 , Pages 1412-1419 ; 08870624 (ISSN) Zanganeh, P ; Ayatollahi, S ; Alamdari, A ; Zolghadr, A ; Dashti, H ; Kord, S ; Sharif University of Technology
    Abstract
    Carbon dioxide miscible flooding has become a popular method for Enhanced Oil Recovery (EOR) because it not only efficiently enhances oil recovery but also considerably reduces green house gas emissions. However, it can significantly cause asphaltene deposition, which leads to serious production problems such as wettability alteration, plugging of the reservoir formation, blocking the transportation pipelines, etc. It is crucial to investigate the effects of different factors on asphaltene deposition. A novel experimental setup was prepared to employ a high-pressure visual cell for investigation of asphaltene deposition on a model rock under typical reservoir conditions. The evolution of... 

    Experimental investigation of water alternating CH4-CO2 mixture gas injection to light oil reservoirs

    , Article 74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources, 4 June 2012 through 7 June 2012 ; June , 2012 , Pages 3919-3923 ; 9781629937908 (ISBN) Ghazanfari, M. H. G. H ; Alizadeh, A
    European Association of Geoscientists and Engineers, EAGE  2012
    Abstract
    In this work effect of composition changes of injection gas, CH4 + CO2, on the performance of immiscible WAG injection in light oil, 41 oAPI, which has been rarely attended in the available literature is investigated. Presence of CO2 helps to reduce the MMP of CH4 significantly. Core flood experiments are conducted at reservoir conditions and fixed flow rate of 0.5cc/min on a sandstone sample with the brine concentration of 5000 ppm, and the influence of injection gas composition as well as WAG ratio on oil recovery is investigated. Different mole percents of methane in mixture, 0%, to 100% are examined, and the tests continued to ten alternate cycles with a slug size of 0.1 pore volumes and... 

    Comprehensive study of asphaltene precipitation due to gas injection: Experimental investigation and modeling

    , Article Society of Petroleum Engineers - SPE Enhanced Oil Recovery Conference 2011, EORC 2011, 19 July 2011 through 21 July 2011 ; Volume 1 , July , 2011 , Pages 208-219 ; 9781618390929 (ISBN) Zadeh, G. A. R ; Moradi, S ; Dabir, B ; Emadi, M. A ; Rashtchian, D ; Sharif University of Technology
    2011
    Abstract
    Asphaltene precipitation during natural depletion and miscible gas injection is a common problem in oilfields throughout the world. In this work, static precipitation tests are conducted to investigate effect of pressure, temperature and gas type and concentration on asphaltene instability. Three different oil samples are studied under reservoir conditions with/without nitrogen and methane injection. Besides applying common thermodynamic models, a new scaling equation is presented to predict asphaltene precipitation under HPHT gas injection. Published data from literature are also used in model development. The scaling approach is attractive because it is simple and complex asphaltene... 

    Experimental investigation of the asphaltene deposition process during different production schemes

    , Article Oil and Gas Science and Technology ; Volume 66, Issue 3 , 2011 , Pages 507-519 ; 12944475 (ISSN) Bagheri, M. B ; Kharrat, R ; Ghotby, C ; Sharif University of Technology
    2011
    Abstract
    Experimental Investigation of the Asphaltene Deposition Process during Different Production Schemes - This paper presents the results of asphaltene precipitation and deposition during lean gas injection, CO2 injection and natural depletion in reservoir conditions. In addition, the effect of variations in operating pressure, injection gas concentration and production rate on asphaltene precipitation and deposition were investigated. The severity of asphaltene deposition was found to be more pronounced in lean gas injection in comparison with CO2 injection and natural depletion. Increasing the flow rate in natural depletion xperiments showed a considerable increase in asphaltene deposition,... 

    Experimental study and mathematical modeling of asphaltene deposition mechanism in core samples

    , Article Oil and Gas Science and Technology ; Volume 70, Issue 6 , Nov , 2015 , Pages 1051-1074 ; 12944475 (ISSN) Jafari Behbahani, T ; Ghotbi, C ; Taghikhani, V ; Shahrabadi, A ; Sharif University of Technology
    Editions Technip  2015
    Abstract
    In this work, experimental studies were conducted to determine the effect of asphaltene deposition on the permeability reduction and porosity reduction of carbonate, sandstone and dolomite rock samples using an Iranian bottom hole live oil sample which is close to reservoir conditions, whereas in the majority of previous work, a mixture of recombined oil (a mixture of dead oil and associated gas) was injected into a core sample which is far from reservoir conditions. The effect of the oil injection rate on asphaltene deposition and permeability reduction was studied. The experimental results showed that an increase in the oil injection flow rate can result in an increase in asphaltene... 

    New expert system for enhanced oil recovery screening in non-fractured oil reservoirs

    , Article Fuzzy Sets and Systems ; Volume 293 , 2016 , Pages 80-94 ; 01650114 (ISSN) Eghbali, S ; Ayatollahi, S ; Bozorgmehry Boozarjomehry, R ; Sharif University of Technology
    Elsevier  2016
    Abstract
    As the oil production from conventional oil reservoirs is decreasing, oil production through Enhanced Oil Recovery (EOR) processes is supposed to compensate for both the oil production reduction in matured oil reservoirs and the worldwide dramatic increase in oil demand. Therefore, developing a strategy to choose an optimized EOR technique is crucial to find a resolution for production decline in oil reservoirs. A screening tool recommending the most appropriate EOR method is proposed in this study. An expert fuzzy logic system is employed to screen four well-known EOR methods including miscible CO2 injection, miscible HC gas injection, polymer flooding and steam injection based on the...