Search for: oil-reservoirs
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Total 96 records

    Percolation theory in reservoir engineering

    , Book King, P. R ; Masihi, Mohsen
    World Scientific  2018

    New insight on dynamic behavior of swelling and bond number of light and heavy crude oil during carbonated water flooding

    , Article European Physical Journal Plus ; Volume 135, Issue 1 , January , 2020 Lashkarbolooki, M ; Zeinolabedini Hezave, A ; Riazi, M ; Ayatollahi, S ; Sharif University of Technology
    Springer  2020
    Improving oil recovery and decreasing greenhouse gas emissions are two important attractive features of CO2-enriched water injection into oil reservoirs. Regarding these unique features, the main objective of this study was concentrated to evaluate the swelling behavior of crude oil as a fundamental mechanism of carbonated water (CW) flooding. To achieve these goals, the swelling and Bond number of light and heavy crude oils (namely LCO and HCO, respectively) are measured and compared to each other. The results obtained from the measured swelling factors of crude oil/CW show some complicated behaviors. That is, as temperature increases the swelling factor decreases at low pressure... 

    Level-Set Techniques for Facies Identification in Reservoir

    , M.Sc. Thesis Sharif University of Technology Soltani, Narges (Author) ; Razvan, Mohammad Reza (Supervisor) ; Azari, Hossein (Supervisor)
    The success of oil recovery depends, among other factors, on the ability to provide reliable simulations of the reservoir performance. The reservoir dynamics are usually modeled by a distributed parameter dynamic system whose parameters represent the petrophysical properties of the reservoir. A proper characterization of those reservoir properties is fundamental for an accurate reservoir simulation. The petrophysical properties are highly heterogeneous and only a limited number of measurements are available at certain locations in the reservoir. Therefor, in ordet to obtain accurate prediction of the reservoir performance, it is essential to possess reliable estimates of the petrophysical... 

    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)
    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... 

    Comparing the performance and recovery mechanisms for steam flooding in heavy and light oil reservoirs

    , Article Society of Petroleum Engineers- SPE Heavy Oil Conference ; Volume 1 , 2012 , Pages 28-36 ; 9781622761111 (ISBN) Bagheripour Haghighi, M ; Ayatollahi, S ; Shabaninejad, M ; Sharif University of Technology
    SPE  2012
    The concern over fossil energy shortage for the next decade leads to the extensive research activities in the area of enhanced oil recovery. Steam injection as one of well known EOR process has been used for about five decades to improve the oil production rate and recovery efficiency. Steam flooding is applied to heavy and extra-heavy oil reservoirs; however it could be used in light oil reservoirs in which water injection do not work effectively. Regardless of different performances, this method is an efficient EOR process for both heavy and light oil reservoirs. In this work, two separate numerical models were prepared to investigate steam flooding performance for the recovery of light... 

    Investigation of oil recovery and CO2 storage during secondary and tertiary injection of carbonated water in an Iranian carbonate oil reservoir

    , Article Journal of Petroleum Science and Engineering ; Volume 137 , 2016 , Pages 134-143 ; 09204105 (ISSN) Shakiba, M ; Ayatollahi, S ; Riazi, M ; Sharif University of Technology
    Gas injection process for more oil recovery and in particular CO2 injection is well-established method to increment oil recovery from underground oil reservoirs. CO2 sequestration which takes place during this enhanced oil recovery (EOR) method has positive impact on reducing the greenhouse gas emission which causes global warming. Direct gas injection into depleted oil reservoirs, encounters several shortcomings such as low volumetric sweep efficiency, early breakthrough (BT) and high risk of gas leakage in naturally fractured carbonate oil reservoirs. Carbonated water injection (CWI) has been recently proposed as an alternative method to alleviate the problems associated with gas... 

    Fracture Reservoir Simulation Using Finite Element Method with Logarithmic Shape Functions

    , M.Sc. Thesis Sharif University of Technology Qaseminejad Raeini, Ali (Author) ; Massihi, Mohsen (Supervisor) ; Shojaei, Akbar (Supervisor)
    Oil reservoir simulation serves an important role in forecasting oil production. This forecast, in turn, helps to devise a production scheme for hydrocarbon reservoirs which is one of main objectives of reservoir management team. In this research, using the idea of logarithmic distribution of reservoir fluid pressure around a wellbore, a new method for simulation of naturally fractured reservoir is developed. This method is shown to be more fast and accurate than conventional methods in reservoir simulation. In this method Dual-Porosity formulation is used for description of fluid flow in fractured reservoirs. The governing equations then were discretized by Galerkin Finite element method in... 

    Reservoir Flow Simulation Using Multi-Scale Uscaling Method

    , Ph.D. Dissertation Sharif University of Technology Ashjari, Mohammad Ali (Author) ; Firoozabadi, Bahar (Supervisor)
    This thesis introduces a fast and accurate two-phase reservoir flow simulation procedure. The speed up is achieved by an upscaling technique where coarsening is applied to the detailed geological reservoir descriptions. This process results to two major error sources affecting the simulation accuracy significantly. The homogenization error is appeared when coarse scale data, such as equivalent permeability, is calculated from the available fine grid model information. It is shown that the error can be reduced adjusting coarse grid (non-uniform Cartesian) distribution. For the first time in this study, the grid distribution optimization is done based on “vorticity” map. In particular, the... 

    A Finite Volume Method for Simulation of 2D Two-Phase Flow in Porous Medium with Anisotropic PermeabilityTensor on Unstructured Cell CenterTriangular Grid

    , M.Sc. Thesis Sharif University of Technology Moosavi, Abbas (Author) ; Taghi Zadeh Manzari, Mehrdad (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
    Rapid variation in permeability with strong anisotropy are common features in subsurface reservoirs. When formulating a finite-volume pressure equation scheme, continuous normal flux and pressure are key physical constraints that must be imposed at control-volume interfaces, across which strong discontinuities in permeability can occur.
    The derivation of algebraic flux continuity conditions for full-tensor discretization operators has lead to families of efficient locally conservative flux-continuous control-volume distributed (CVD) finite- volume schemes for determining the discrete pressure and elocity fields in subsurface reservoirs [5, 9, 11, 13].
    When applying these... 

    Multirate Transfer Functions in Dual Porosity-Dual Permeability Models in Simulation of Naturally Fractured Reservoirs in 2D Two Phase Water-Oil System

    , M.Sc. Thesis Sharif University of Technology Rezaei, Sajjad (Author) ; Taghi Zade Manzari, Meherdad (Supervisor) ; Afshin, Hossein (Co-Advisor) ; Kazemzadeh Hannani, Siamak (Co-Advisor)
    Naturally Fractured Reservoirs (NFRs) play an important role in petroleum industry and the global economy.. The reservoirs of the most complex geological structures in petroleum engineering science, on the other hand the largest sources of hydrocarbons are considered throughout the world and especially in our country. Therefore, characterization and modeling them frst step to develop best practices for hydraulic fracturing gap, optimal design of production Method and evaluate potential reservoirs. Physics of the present work is 2D two-phase immiscible flow under gravittational effect through fractured porous media and the most practical formulas for transfer function in dual porosity-dual... 

    A Proper Method of Upscaling Permeability data in a Typical Iranian Reservoir

    , M.Sc. Thesis Sharif University of Technology Shokoohi Dehkordi, Mojdeh (Author) ; Shadizadeh, Reza (Supervisor) ; Jonoud, Sima (Co-Supervisor)
    In this paper we have tried to mention a proper method of upscaling permeability data in a typical Iranian reservoir. Firstly a literature review is made on some common upscaling methods witch have been used so far. We introduced common upscaling methods like full tensor method, streamline method, stone method , vertical equilibrium method and also Kyte & Berry method. Additionally we have explained their advantages and also disadvantages. After selecting two upscaling methods, Kyte & Berry method and vertical equilibrium method, we applied these algorithms for upscaling of permeability data of Soroosh Oil Field. Soroosh oilfield is a heavy oil, Iranian reservoir located in Persian Gulf.... 

    Parallel Simulation of Petroleum Reservoir on Clusters

    , M.Sc. Thesis Sharif University of Technology Fardad, Mohammad Hossein (Author) ; Habibi, Jafar (Supervisor)
    The main goal of petroleum reservoir simulation is finding of Pressure (P) and Saturation (S) of fluid in different places of prose media environment of the reservoir in a specific time interval. In this project we will implement a distributed reservoir simulator of a cluster. In fact parallelization of reservoir simulator is finding a method to decompose the reservoir domain into some region and assigning each region to a computer in a cluster of parallel computers in order to minimize the total amount of dependency of regions to each other and messages between nodes in the parallel network according to fluid equation in the system and finaly minimize' the duration of simulation. In this... 

    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... 

    Application of multi-criterion robust optimization in water-flooding of oil reservoir

    , Article Journal of Petroleum Science and Engineering ; Volume 109 , September , 2013 , Pages 1-11 ; 09204105 (ISSN) Yasari, E ; Pishvaie, M. R ; Khorasheh, F ; Salahshoor, K ; Kharrat, R ; Sharif University of Technology
    Most of the reported robust and non-robust optimization works are formulated based on a single-objective optimization, commonly in terms of net present value. However, variation of economical parameters such as oil price and costs forces such high computational optimization works to regenerate their optimum water injection policies. Furthermore, dynamic optimization strategies of water-flooding often lack robustness to geological uncertainties. This paper presents a multi-objective while robust optimization methodology by incorporating three dedicated objective functions. The goal is to determine optimized and robust water injection policies for all injection wells. It focuses on reducing... 

    Optimal conditions for immiscible recycle gas injection process: A simulation study for one of the Iranian oil reservoirs

    , Article Scientia Iranica ; Volume 18, Issue 6 , 2011 , Pages 1407-1414 ; 10263098 (ISSN) Mohammadi, S ; Kharrat, R ; Khalili, M ; Mehranfar, M ; Sharif University of Technology
    Immiscible gas injection is one of the most common enhanced oil recovery methods used under various reservoir conditions. In this work, the immiscible recycle gas injection, as an EOR scenario for improving recovery efficiency in one of the south-west Iranian oil reservoirs, is simulated by a commercial simulator, ECLIPSE. The reservoir fluid is light oil, with an API of 43. The oil bearing formations are carbonate, and so a dual porosity/dual permeability behavior was chosen for better representation of the fracture system. Different sensitivity analyses with respect to several parameters like the number and location of injection/production wells, production/injection rate, completion... 

    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
    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)
    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... 

    Development of Low-order Model/controllers for Oil Reservoir Smart Wells

    , M.Sc. Thesis Sharif University of Technology Hemmati, Sahar (Author) ; Pishvaie, Mahmoud Reza (Supervisor)
    Upstream oil industry operators have turned to optimal production methods for further recoveries, such as smart wells. Control algorithms for smart wells must be equipped with online measurements, in other words, reflected in the feedback philosophy. On the other hand, after discretization, an oil reservoir's dynamic and control-driven model becomes a realization or a large-scale and sparse state space. One way to deal with this problem and provide an appropriate model for the design of smart well controllers is to use appropriate reservoir dimensional reduction methods. Therefore, to design low-order controllers, a study must first be performed at the level of the reservoir model and its... 

    1D Simulation of Naturally Fractured Oil Reservoir Flow with High Resolution Central Scheme Using Black-Oil Model

    , M.Sc. Thesis Sharif University of Technology Mojaddam, Mohammad (Author) ; Taghizadeh Manzari, Mehrdad (Supervisor)
    In This work, the performance of a finite volume (FV) numerical method is examined for simulating naturally fractured hydrocarbon reservoir. The dual-porosity approach applied for fracture modeling, and the flow transfer formulated based on a generalized black oil model which is based on matrix formulation, leading to a system of equations prone to degeneracy. This FV high-resolution central scheme numerical method is not sensitive to the choice of CFL number like some of other central schemes and can conveniently handle degenerate equations appearing in the reservoir simulation governing equation. In this effort, one dimension multi phase flow simulated in naturally fractured reservoir and... 

    Multiscale Finite-Volume Simulation of Multi Phase Flow in Heterogeneous Porous Media

    , M.Sc. Thesis Sharif University of Technology Karimyan, Erfan (Author) ; Pishvaie, Mahmood Reza (Supervisor) ; Taghizadeh Manzari, Mehrdad (Supervisor)
    Multi-Scale finite volume (MSFV) method have been developed and applied for multiphase flow in porous media. The most important advantage of MSFV method is its computational efficiency. In this thesis we apply and implement this method to porous media simulation. Then, computational parameters such as coarsening ratio, effect of threshold on adaptive computation and different boundary conditions for computing basis functions are investigated. The two difficulties of sMSFV method are problems with high permeability contrast and problems with high course grid aspect ratio which are considered. In standard MSFV (sMSFV) method reduced boundary condition is used to determine the basis and...