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    The dependency of relative permeability on dominated flow regimes under gas gravity assisted flow

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 33, Issue 2 , Oct , 2011 , Pages 101-113 ; 15567036 (ISSN) Rostami, B ; Kharrat, R ; Pooladi Darvish, M ; Ghotbi, C ; Sharif University of Technology
    2011
    Abstract
    Gas-oil relative permeability is essential for performance predictions of reservoirs with solutions for gas drive, gas cap expansion, or gas injection. The nature of flow in reservoir is determined by the interplay of relative permeability and viscous, gravity, and capillary forces. Displacement experiments of the gas-oil system are performed on long core scale models by varying the petrophysical properties and flow conditions. Experiments are conducted in situations where capillary, gravity, and viscous forces are comparable. The effect of destabilized front velocity on relative permeability and residual saturation is investigated. The results indicate that the relative permeability varies... 

    Two-phase flow in microchannels with a bounding porous medium

    , Article ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2011, 19 June 2011 through 22 June 2011 ; Volume 1 , June , 2011 , Pages 263-268 ; 9780791844632 (ISBN) Nouri Borujerdi, A ; Sharif University of Technology
    2011
    Abstract
    This paper investigates numerical simulation of one-dimensional homogeneous adiabatic gas-liquid two-phase flow in a rectangular microchannel with one boundary porous wall under the assumption of hydrophobic condition. Gas enters the microchannel with a uniform velocity and liquid is injected through the porous side wall. The present approach is to simulate water injection effects and developing mechanism of two-phase flow. The modeling and solution of the conservation equations provide pressure drop, vapor quality, void fraction and tow-phase mixture velocity for different water injection rates. The results show that velocity and pressure drop significantly perturbed when the water... 

    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... 

    Improvement of buckley-leverett and fractional flow models for heterogeneous porous media

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 37, Issue 10 , 2015 , Pages 1125-1132 ; 15567036 (ISSN) Kamari, E ; Shadizadeh, S. R ; Rashtchian, D ; Sharif University of Technology
    Abstract
    Most of the reservoirs in Iran and also around the world are in the middle of their production life and have passed their natural production period. Therefore, they should be a candidate for immiscible injection, e.g., water injection for secondary recovery, and/or miscible injection, like solvent injection for tertiary recovery. Also, it should be pointed out that most of the Iranian reservoirs are carbonate reservoirs. This type of reservoir is fractured and heterogenic. Heterogeneity causes an earlier breakthrough and immiscible injection causes an unstable front, which leads to a lower recovery. This article presents the modified equation of Buckley-Leverett and fractional flow... 

    Smart water flooding performance in carbonate reservoirs: an experimental approach for tertiary oil recovery

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 9, Issue 4 , 2019 , Pages 2643-2657 ; 21900558 (ISSN) Darvish Sarvestani, A ; Ayatollahi, S ; Bahari Moghaddam, M ; Sharif University of Technology
    Springer  2019
    Abstract
    Smart water flooding as a developing technique utilizes modified water chemistry in terms of salinity and composition to prepare the best-suited brine composition for a specific brine/oil/rock system to obtain higher oil recovery efficiency. Huge amount of unrecovered oil is expected to be remained in carbonate reservoirs; however, few research works on incremental oil recovery during smart water injection in carbonate cores at reservoir condition are reported. Several core flooding tests using one of the Iranian carbonate reservoir rock are conducted to check the effectiveness of smart water injection for more oil recovery efficiency. The results reaffirm the positive effect of sulfate ions... 

    Investigation The Effect Of Wettability Alteration On Increasing Recovery Factor At Fractured Reservoirs

    , M.Sc. Thesis Sharif University of Technology Chahardahcherik, Morteza (Author) ; Jamshidi, Saeid (Supervisor) ; Masihi, Mohsen (Supervisor)
    Abstract
    There are a lot of Fractured reservoirs around the world that have large portion of oil production. These reservoirs have complex structure and fractures have important role in production but the remaining oil in matrix causes that the oil recovery decreases. One of the most important factors in these reservois are wettability. Because most of the fractured reservoirs are oil wet and water injection process in these reservoirs are not effective and chemical EOR methods such as surfactant flooding method is used. Surfactant improve oil recovery by two reasons: 1- reduction of interfacial tension between oil and water . 2-Wettability alteration of matrix. The porpose of this project is... 

    Experimental and Simulation Study of Water Alternating Hydrocarbon - CO2 Mixture Gas in one of Iranian Oil Reservoirs

    , M.Sc. Thesis Sharif University of Technology Alizadeh, Ali (Author) ; Taghikhani, Vahid (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Badakhshan, Amir (Supervisor)
    Abstract
    In this work the effect of composition changes of the injection gas (Hydrocarbon gas + carbon dioxide) on Water Alternating Gas (WAG) performance in immiscible flooding which has been rarely attended in the available literature is investigated. Core flood experiments are conducted on a 10 cm length Sarvak sandstone core sample at 46 degree C and at immiscible condition, i.e., below the minimum miscible pressure (MMP) of the oil sample using pure CO2 as injected Gas.The influence of injection WAG ratio on oil recovery also is investigated. Artificial injection brine which is made by dissolving NaCl into distilled water with 5000 ppm (mg/L), NaftShahr oil which has about 41 API gravity and... 

    Scale Formation in Porous Media and its Impact on Reservoir Performance During Water Flooding

    , M.Sc. Thesis Sharif University of Technology Abedi, Emad (Author) ; Masihi, Mohsen (Supervisor) ; Taghikhani, Vahid (Co-Supervisor) ; Ghazanfari, Mohammad Hossein (Co-Supervisor)
    Abstract
    Mineral scale precipitation and carbonate rock dissolution are among the most important reactions that usually occur during water injection in oil reservoirs. These reactions happen due to incompatibility between formation water and injection water as well as deviation from equilibrium conditions. These reactions must be considered precisely because of the fact that they result in variation of reservoir porosity and permeability which affects recovery factor. In this study, the effect of injection pressure on these variations during single-phase water flooding is examined accurately. Additionally, the changes of ion concentration and the amount of dissolved or precipitated calcite or... 

    A modified scaling equation based on properties of bottom hole live oil for asphaltene precipitation estimation under pressure depletion and gas injection conditions

    , Article Fluid Phase Equilibria ; Volume 358 , 2013 , Pages 212-219 ; 03783812 (ISSN) Jafari Behbahani, T ; Ghotbi, C ; Taghikhani, V ; Shahrabadi, A ; Sharif University of Technology
    2013
    Abstract
    The process of asphaltene precipitation has a substantial effect on oil flow during primary oil production and enhanced oil recovery processes in the petroleum industry. In this work, a modified scaling model based on the PVT properties of bottom hole live oil including resin to asphaltene ratio, onset pressure, bubble point pressure, reservoir temperature, asphaltene content of bottom hole live oil and gas to oil ratio has been proposed to account for asphaltene precipitation under pressure depletion/gas injection conditions and the proposed model was verified using experimental data obtained in this work and also with those reported in the literature. In the proposed scaling model the... 

    Experimental and computer based simulation study of WAG process

    , Article CHISA 2006 - 17th International Congress of Chemical and Process Engineering, Prague, 27 August 2006 through 31 August 2006 ; 2006 ; 8086059456 (ISBN); 9788086059457 (ISBN) Taheri, S ; Kharrat, R ; Ghazanfari, M. H ; Khodabakhsh, M ; Sharif University of Technology
    2006
    Abstract
    In reservoirs that have been water flooded or gas injected, it is still a significant amount of the remaining oil. Water alternative gas injection is a tertiary oil recovery method which was used for the first time in Canada for recovering remained oil in place of reservoir. The pore-scale mechanisms of this process are not fully understood yet. Such knowledge is essential for accurate modelling of reservoir. In this study various experiments on the WAG process is carried out by means of high pressure glass type micromodel instrument. The micromodel apparatus in this experiment was capable to operate at pressures up to 3500 Psi and temperatures up to 85°C which is similar to conventional... 

    Microscopic Investigation of the Effect of Low Salinity Waterflooding on Asphaltene Precipitation and Deposition Using Microfluidic Method

    , M.Sc. Thesis Sharif University of Technology Salari, Amir Hossein (Author) ; Ayatollahi, Shahabodin (Supervisor) ; Mahani, Hassan (Supervisor)
    Abstract
    Water injection, as one of the conventional methods to increase the oil recovery factor has always been at the center of research works for Enhanced Oil Recovery (EOR). The conducted studies show that by controlling the amount and type of ions in the injected water, the recovery efficiency can be improved. In the meantime, most of the investigations are focused on the interaction between water/rock/oil to trace the wettability alteration. However, these interactions especially between the injected water and the oil phase, would lead to change of surface charge distribution of the reservoir rock. Besides, this effect can change some of the characteristics of the fluid phases, especially in... 

    Effects of boundary layer control method on hydrodynamic characteristics and tip vortex creation of a hydrofoil

    , Article Polish Maritime Research ; Volume 24, Issue 2 , 2017 , Pages 27-39 ; 12332585 (ISSN) Ghadimi, P ; Tanha, A ; Kourabbasloo, N. N ; Tavakoli, S ; Sharif University of Technology
    De Gruyter Open Ltd  2017
    Abstract
    There is currently a significant focus on using boundary layer control (BLC) approach for controlling the flow around bodies, especially the foil sections. In marine engineering this is done with the hope of increasing the lift - to - drag ratio and efficiency of the hydrofoils. In this paper, effects of the method on hydrodynamic characteristics and tip vortex formation of a hydrofoil are studied. Steady water injection at the tip of the hydrofoil is simulated in different conditions by using ANSYS-CFX commercial software. Validity of the proposed simulations is verified by comparing the obtained results against available experimental data. Effects of the injection on the lift, drag, and... 

    Experimental study of dynamic imbibition during water flooding of naturally fractured reservoirs

    , Article Journal of Petroleum Science and Engineering ; Volume 174 , 2019 , Pages 1-13 ; 09204105 (ISSN) Harimi, B ; Masihi, M ; Mirzaei Paiaman, A ; Hamidpour, E ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    Capillary imbibition is an important recovery mechanism in naturally fractured reservoirs when water-filled fractures surround water-wet matrix blocks. A large amount of studies of imbibition process is simply total or partial immersion of nonwetting phase saturated rock in aqueous wetting phase. However, water advance in fractures during water flooding or water encroachment from an active aquifer introduces time dependent boundary conditions where invariant exposure of rock surface to water is not representative. In this work, a laboratory simulated matrix-fracture system was used to investigate different aspects of imbibition in the presence of fracture fluid flow (namely dynamic... 

    A laboratory approach to enhance oil recovery factor in a low permeable reservoir by active carbonated water injection

    , Article Energy Reports ; Volume 7 , 2021 , Pages 3149-3155 ; 23524847 (ISSN) Chen, X ; Paprouschi, A ; Elveny, M ; Podoprigora, D ; Korobov, G ; Sharif University of Technology
    Elsevier Ltd  2021
    Abstract
    In this paper, different injectivity scenarios were experimentally investigated in a coreflooding system to observe the efficiency of each method in laboratory conditions. Surfactant flooding, CO2 injection, carbonated water injection (CWI), active carbonated water injection (ACWI), after water flooding were investigated through the coreflooding system. First, it is necessary to optimize the surfactant concentration and then use it in ACWI injection. To do this, linear alkylbenzene sulfonic acid (LABSA) was used as a cationic surfactant at different concentrations. It was observed that 0.6 PV concentration of LABSA had an optimum result as increasing the surfactant concentration would not be... 

    Numerical simulation of cold and hot water injection into naturally fractured porous media using the extended–FEM and an equivalent continuum model

    , Article International Journal for Numerical and Analytical Methods in Geomechanics ; 2021 ; 03639061 (ISSN) Mortazavi, S. M. S ; Pirmoradi, P ; Khoei, A. R ; Sharif University of Technology
    John Wiley and Sons Ltd  2021
    Abstract
    In this paper, a computational technique is presented for the isothermal and non-isothermal water injection into naturally fractured oil reservoirs. A remarkable number of naturally fractured reservoirs contain relatively heavy oils that could not be extracted economically; hence, the thermal recovery methods are extensively used for such reservoirs. In this study, the effectiveness of hot water injection over cold (isothermal) water injection in oil production is quantified. The influence of long and short fractures and their alignments on oil recovery are discussed. To this end, a 2D model for two-phase fluid flow and heat transfer is presented. The medium is assumed to be partially... 

    Laboratory and Modeling Study of Formation Injectivity Decline Due to Mineral Scale Deposition in Water Injection in one of Iranian Oil Resrvoirs

    , M.Sc. Thesis Sharif University of Technology Hashemkhani, Mohammed (Author) ; Masihi, Mohsen (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    Scale deposition is one of the reasons of formation damage during water injection process. This phenomenon often ocuures when two incompatible waters that interact chemically and precipitate minerals, mix within the reservoir. A typical example is sea water, with high concentration of sulfate ion and formation water, with high concentrations of calcium and/or barium ions. Mixing of these waters, therefore, can cause precipitation of calcium sulfate and/or barium sulfate. This study was conducted to investigate the permeability reduction caused by deposition of calcium and barium sulfates in carbonate cores from mixing of injected sea water and formation water in two flow rates and two... 

    Experimental Investigation of Mechanism of Wettability Alteration Induced By Hot Water and Steam Injection

    , M.Sc. Thesis Sharif University of Technology Salehi, Afshin (Author) ; Masihi, Mohsen (Supervisor)
    Abstract
    One of the most important production mechanisms of fractured reservoirs is wettability alteration. Since most fractured reservoirs are carbonate, and thus are often oil-wet; production of these reservoirs is facing their special challenges. Since most of our country reservoirs are fractured carbonate type, determination of the exact mechanisms of their production is necessary. Thermal EOR methods traditionally have been welcomed by big oil companies. Also, these methods of enhanced oil recovery techniques, have a much greater share in the production history of all EOR methods, rather than other EOR methods. Exponentially decreasing of oil viscosity on heating, is the main reason for using... 

    Smart Water Injection to the Oil Fields for Enhancing the Recovery Factor

    , M.Sc. Thesis Sharif University of Technology Malekpour, Hossein (Author) ; Farhadi, Alireza (Supervisor)
    Abstract
    The objective of this MSc. thesis is to study the impact of the reactive method and the enhanced reactive method on enhancing the exploitation efficiency of Iran's offshore oil reservoir. This is achieved by enhancing production and the recovery factor of the reactive methods with respect to the currently used proactive method. Unlike the currently used proactive method that implements a fixed rate injection strategy, in this MSc. thesis water is injected to reservoir with multi-rate for the pressure stabilization of the reservoir. In order to scale up this strategy, the ensemble Kalman filter is used to frequently update the reservoir mathematical model using the available measurements from... 

    Numerical Simulation of Cold and Hot Water Injection into Naturally Fractured Reservoirs Using the Extended Finite Element Method

    , M.Sc. Thesis Sharif University of Technology Pirmoradi, Pouriya (Author) ; Khoei, Amir Reza (Supervisor)
    Abstract
    The present article studies the isothermal and non-isothermal water injection into naturally fractured oil reservoirs by numerical simulation. The fractures in naturally fractured reservoirs can possess different characteristics. In addition. a remarkable number of naturally fractured reservoirs contain relatively heavy oils that could not be extracted economically; hence. the thermal recovery methods are extensively used for these reservoirs. Hot water injection is one of the thermal recovery methods that has not been explored enough compared to its alternatives. In this study. the effectiveness of the hot water injection over the cold (isothermal) water injection in oil production is... 

    Predictions of Formation Damage Due to Inorganic Scale Deposition during Water Injection in Oil Reservoirs Using Experimental-Based Mathematical Modeling

    , M.Sc. Thesis Sharif University of Technology Rahbari, Mohammad Reza (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Masihi, Mohsen (Supervisor)
    Abstract
    Water flooding is known as a common method to maintain reservoir pressure/enhance oil recovery. The major problem in this process induced from inorganic deposits that caused formation damage around wellbore region. It is due to incompatible nature of injected and formation water which results in permeability reduction and well productivity decrease. Solving this problem is an important issue in the petroleum industry. BaSO4, CaSO4 and SrSO4 are inorganic sediments formed in this process. The physical model of water transport in reservoir and scaling damage due to sediments contains at least two dominant parameters; the kinetics coefficient that specifies the velocity of chemical reaction,...