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    Phase behavior and rheology of emulsions in an alkaline/cosolvent/crude oil/brine system

    , Article Petroleum Science and Technology ; Volume 34, Issue 3 , 2016 , Pages 207-215 ; 10916466 (ISSN) Bahman Abadi, H ; Hemmati, M ; Shariat Panahi, H ; Masihi, M ; Karam Beigi, M. S ; Sharif University of Technology
    Taylor and Francis Inc 
    Abstract
    Phase behavior of active crude oil/alkaline was systematically studied in the presence of cosolvents. For this purpose, several factors have been considered: alkaline concentration, oil concentration, and type of brine. The best composition was used to generate emulsion for rheology and displacement tests. Furthermore, precipitation of alkaline was eliminated by its synergy with EDTA. Next, rheology of emulsion was analyzed by which a Power law model was developed that indicates non-Newtonian behavior of emulsion. Moreover, the viscosity of emulsion was reduced by the addition of cosolvent as well as by the increase of alkaline concentration. Finally, the best formulation (containing... 

    A comparison of WAG and SWAG processes: Laboratory and simulation studies

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 35, Issue 23 , 2013 , Pages 2225-2232 ; 15567036 (ISSN) Heidari, P ; Kharrat, R ; Alizadeh, N ; Ghazanfari, M. H ; Sharif University of Technology
    2013
    Abstract
    The use of water-alternating-gas injection can potentially lead to improved oil recovery from the fields; simultaneous water and gas injection is a form of water-alternating-gas injection. However, there is still an incomplete understanding of these processes and the need for comparative work is inevitable. Core flood experiments and compositional simulations of water-alternating-gas and simultaneous water and gas processes are presented. Immiscible, near miscible, and miscible modes of injection are covered. Matching process is done and optimization of design parameters (injection rate, slug size, water-alternating-gas ratio, and injection gas) is performed. Experimental data demonstrate... 

    Experimental investigation of the influence of supercritical carbon dioxide and supercritical nitrogen injection on tertiary live-oil recovery

    , Article Journal of Supercritical Fluids ; Volume 117 , 2016 , Pages 260-269 ; 08968446 (ISSN) Lashkarbolooki, M ; Vaezian, A ; Zeinolabedini Hezave, A ; Ayatollahi, S ; Riazi, M ; Sharif University of Technology
    Elsevier  2016
    Abstract
    Generally, there are different enhanced oil recovery (EOR) methods. One of the most promising EOR method is the gas injection especially carbon dioxide (CO2) injection since it introduce several unique characteristic desired for higher tertiary oil recovery. In this study, the performance and feasibility of supercritical carbon dioxide (SC-CO2) and supercritical nitrogen (SC-N2) injection to enhanced oil recovery was investigated. In this regard, swelling tests and core flooding experiments were performed to find out whether the injections of these gases are efficient to recover trapped oil in the reservoir. Based on the experimental results, the possible active mechanisms were discussed on... 

    Application of different novel and newly designed commercial ionic liquids and surfactants for more oil recovery from an Iranian oil field

    , Article Journal of Molecular Liquids ; Volume 230 , 2017 , Pages 579-588 ; 01677322 (ISSN) Nabipour, M ; Ayatollahi, S ; Keshavarz, P ; Sharif University of Technology
    Elsevier B.V  2017
    Abstract
    This investigation is conducted on one of the southern Iranian oil fields, which experiences a fault on its gas cap. Therefore, no traditional gas injection and normal water injection for pressure maintenance is suggested. The target is set to inject special compatible and proper type of chemicals in each single well to avoid the pressure increase for the risk of oil and gas spill. Two different sources of aqueous phases, namely formation brine and sea water were used to find the effects of different brine composition on the main mechanisms of releasing the trapped oil, interfacial tension (IFT) and wettability alteration. The obtained results reveal that both the ionic liquid (IL) based... 

    Activating solution gas drive as an extra oil production mechanism after carbonated water injection

    , Article Chinese Journal of Chemical Engineering ; Volume 28, Issue 11 , 2020 , Pages 2938-2945 Shakiba, M ; Ayatollahi, S ; Riazi, M ; Sharif University of Technology
    Materials China  2020
    Abstract
    Enhanced oil recovery (EOR) methods are mostly based on different phenomena taking place at the interfaces between fluid–fluid and rock–fluid phases. Over the last decade, carbonated water injection (CWI) has been considered as one of the multi-objective EOR techniques to store CO2 in the hydrocarbon bearing formations as well as improving oil recovery efficiency. During CWI process, as the reservoir pressure declines, the dissolved CO2 in the oil phase evolves and gas nucleation phenomenon would occur. As a result, it can lead to oil saturation restoration and subsequently, oil displacement due to the hysteresis effect. At this condition, CO2 would act as in-situ dissolved gas into the oil... 

    Relative permeability measurement in carbonate rocks, the effects of conventional surfactants vs. Ionic liquid-based surfactants

    , Article Journal of Dispersion Science and Technology ; Volume 41, Issue 12 , 2020 , Pages 1797-1811 Zabihi, S ; Faraji, D ; Rahnama, Y ; Zeinolabedini Hezave, A ; Ayatollahi, S ; Sharif University of Technology
    Bellwether Publishing, Ltd  2020
    Abstract
    In the present study, the effect of two different kinds of surfactants namely conventional (Sodium dodecyl benzene sulfonate (SDBS)) and ionic liquid (IL)-based surfactants are investigated on the tertiary oil recovery using relative permeability concept. In this way, besides the Amott wettability index measurement, unsteady state core flooding tests are performed to not only find the effect of surfactant injection on tertiary oil recovery, but also to investigate their effects on relative permeability of carbonate rocks. In addition, for more reliable conclusions regarding the possible mechanisms, interfacial tension (IFT), compatibility and emulsification tests are carried out as a... 

    Model development for MEOR process in conventional non-fractured reservoirs and investigation of physico-chemical parameter effects

    , Article Chemical Engineering and Technology ; Volume 31, Issue 7 , 2008 , Pages 953-963 ; 09307516 (ISSN) Behesht, M ; Roostaazad, R ; Farhadpour, F ; Pishvaei, M. R ; Sharif University of Technology
    2008
    Abstract
    A three-dimensional multi-component transport model in a two-phase oil-water system was developed. The model includes separated terms to account for the dispersion, convection, injection, growth and death of microbes, and accumulation. For the first time, effects of both wettability alteration of reservoir rock from oil wet to water wet and reduction in interfacial tension (IFT) simultaneously on relative permeability and capillary pressure curves were included in a MEOR simulation model. Transport equations were considered for the bacteria, nutrients, and metabolite (bio-surfactant) in the matrix, reduced interfacial tension on phase trapping, surfactant and polymer adsorption, and effect...