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    Improvement of fractional flow model for miscible displacement process: An experimental investigation in single fractured porous medium

    , Article Journal of Porous Media ; Volume 16, Issue 3 , 2013 , Pages 255-266 ; 1091028X (ISSN) Kamari, E ; Shadizadeh, S. R ; Rashtchian, D ; Sharif University of Technology
    2013
    Abstract
    Most of the reservoirs in Iran are heterogeneous fractured carbonate reservoirs. Heterogeneity causes an earlier breakthrough and an unstable front, which leads to a lower recovery. In this study, a series of experiments was conducted whereby the n-Heptane displaced n-Decane in glass micromodels having different fracture geometries. Experimental data from image analysis of miscible displacement processes are used to modify the fractional flow equations by a heterogeneity factor. It is shown that the heterogeneity factor in the modified equations can be expressed as a function of fracture length and orientation  

    Effect of fracture spacing on VAPEX performance in heavy oil fracture systems

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 27, Issue 1 , 2008 , Pages 35-45 ; 10219986 (ISSN) Azin, R ; Kharrat, R ; Ghotbi, C ; Vossoughi, S ; Sharif University of Technology
    2008
    Abstract
    The vapor extraction (VAPEX) process; a solvent-based enhanced oil recovery process has been found promising for some heavy oil reservoirs. In this work, the VAPEX process is studied using a compositional simulator on a number of single-block and multiple block fractured systems. PVT data of one of an Iranian heavy oil reservoir are used to tune the equation of state. Effects of fracture spacing on the performance of process were studied. It was found that the fracture network enhances the VAPEX process in low-permeability systems by increasing the contact area between solvent and oil contained in the matrix blocks. Also, the fracture network reduced the instabilities in the system pressure... 

    Immiscible Displacement of a Wetting Fluid by a Non-wetting One at High Capillary Number in a Micro-model Containing a Single Fracture

    , Article Transport in Porous Media ; Volume 94, Issue 1 , 2012 , Pages 289-301 ; 01693913 (ISSN) Kamari, E ; Rashtchian, D ; Shadizadeh, S. R ; Sharif University of Technology
    Abstract
    Most reservoirs in Iran are heterogeneous fractured carbonate reservoirs. Heterogeneity causes an earlier breakthrough and an unstable front which leads to a lower recovery. A series of experiments were conducted whereby the distilled water displaced n-Decane in strongly oil-wet glass micro-models containing a single fracture. Experimental data from image analysis of immiscible displacement processes are used to modify the Buckley-Leverett and fractional flow equations by a heterogeneity factor. It is shown that the heterogeneity factor in the modified equations can be expressed as a function of fracture length and orientation  

    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... 

    Mathematical Modeling of Diffusion in Fractured Media for Gas Injection

    , M.Sc. Thesis Sharif University of Technology Saki, Mohammad (Author) ; Masihi, Mohsen (Supervisor) ; Shadizadeh, Reza (Supervisor) ; Ayatollahi, Shahabeddin (Co-Advisor)
    Abstract
    It is common to inject gas in naturally fractured reservoirs to maintain the reservoir pressure. Recovery will be the result of the complex interplay of several mechanisms such as viscous flow, extraction by molecular diffusion, gravity drainage, oil swelling and capillary force. Generally the main mechanism is gravity drainage However in many cases like low permeability of matrix, small matrix block size and high capillary pressure; gravity drainage may be very low or ineffective. Low permeability results inefficient viscous displacement too. Therefore in these cases the main mechanism is diffusion. The parameters influences the diffusion are: The nature of the injected gas, the composition... 

    Investigation of underground gas storage in a partially depleted naturally fractured gas reservoir

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 29, Issue 1 , 2010 , Pages 103-110 ; 10219986 (ISSN) Jodeyri Entezari, A ; Azin, R ; Nasiri, A ; Bahrami, H ; Sharif University of Technology
    Abstract
    In this work, studies of underground gas storage (UGS) were performed on a partially depleted, naturally fractured gas reservoir through compositional simulation. Reservoir dynamic model was calibrated by history matching of about 20 years of researvoir production. Effects of fracture parameters, i.e. fracture shape factor, fracture permeability and porosity were studied. Results showed that distribution of fracture density affects flow and production of water, but not that of gas, through porous medium. However, due to high mobility of gas, the gas production and reservoir average pressure are insensitive to fracture shape factor. Also, it was found that uniform fracture permeability... 

    Multi-criterion based well placement and control in the water-flooding of naturally fractured reservoir

    , Article Journal of Petroleum Science and Engineering ; 2016 ; 09204105 (ISSN) Bagherinezhad, A ; Boozarjomehry Bozorgmehry, R ; Pishvaie, M. R ; Shaarif University of Technology
    Elsevier B. V 
    Abstract
    In the optimization of naturally fractured reservoirs, it is required to take into account their complex flow behavior due to high conductivity fractures. In this regard, the possible effects of fractures must be included in the optimization procedure. In a water-flooding project, fast water breakthrough from injection to production wells may be occurred because of high permeability fractures. To consider the effect of the fracture system, a multi-criterion optimization procedure is proposed in this work. For this contribution, Non-dominated Sorting Genetic Algorithm version II (NSGA-II) is implemented for the optimization purposes. Considering the effect of the fracture system on the flow... 

    Estimating the properties of naturally fractured reservoirs using rate transient decline curve analysis

    , Article Journal of Earth Science ; Volume 28, Issue 5 , 2017 , Pages 848-856 ; 1674487X (ISSN) Daryasafar, A ; Joukar, M ; Fathinasab, M ; Da Prat, G ; Kharrat, R ; Sharif University of Technology
    Abstract
    Transient rate decline curve analysis for constant pressure production is presented in this paper for a naturally fractured reservoir. This approach is based on exponential and constant bottom-hole pressure solution. Based on this method, when ln (flow rate) is plotted versus time, two straight lines are obtained which can be used for estimating different parameters of a naturally fractured reservoir. Parameters such as storage capacity ratio (ω), reservoir drainage area (A), reservoir shape factor (CA), fracture permeability (kf), interporosity flow parameter (λ) and the other parameters can be determined by this approach. The equations are based on a model originally presented by Warren... 

    Tracer transport in naturally fractured reservoirs: Analytical solutions for a system of parallel fractures

    , Article International Journal of Heat and Mass Transfer ; Volume 103 , 2016 , Pages 627-634 ; 00179310 (ISSN) Abbasi, M ; Hossieni, M ; Izadmehr, M ; Sharifi, M ; Sharif University of Technology
    Elsevier Ltd 
    Abstract
    In naturally fractured reservoirs, modeling of mass transfer between matrix blocks and fractures is an important subject during gas injection or contaminant transport. This study focuses on developing an exact analytical solution to transient tracer transport problem along a discrete fracture in a porous rock matrix. Using Gauss-Legendre quadrature, an expression was obtained in the form of a double integral which is considered as the general transient solution. This solution has the ability to account the following phenomena: advective transport in fractures and molecular diffusion from the fracture to the matrix block. Certain assumptions are made which allow the problem to be formulated... 

    Experimental and modelling study of gravity drainage in a three-block system

    , Article Transport in Porous Media ; 2020 Erfani, H ; Karimi Malekabadi, A ; Ghazanfari, M. H ; Rostami, B ; Sharif University of Technology
    Springer Science and Business Media B.V  2020
    Abstract
    Gravity drainage is known as the controlling mechanism of oil recovery in naturally fractured reservoirs. The efficiency of this mechanism is controlled by block-to-block interactions through capillary continuity and/or reinfiltration processes. In this study, at first, several free-fall gravity drainage experiments were conducted on a well-designed three-block apparatus and the role of tilt angle, spacers’ permeability, wettability and effective contact area (representing a different status of the block-to-block interactions between matrix blocks) on the recovery efficiency were investigated. Then, an experimental-based numerical model of free-fall gravity drainage process was developed,... 

    Comparison of dual Porosity-Dual Permeability Models in 2D Two-Phase Immiscible Flows under Gravitational Effect

    , M.Sc. Thesis Sharif University of Technology Kohanpur, Amir Hossein (Author) ; Taghizadeh Manzari, Mehrdad (Supervisor) ; Kazemzadeh Hannani, Siamak (Co-Advisor)
    Abstract
    Physics of the present work is 2D two-phase immiscible flow under gravitational effect through fractured porous media and the most practical formulas for transfer function in dual porosity-dual permeability models have been implemented for numerical simulation of naturally fractured reservoir. The models are: Kazemi et al. (1976), Gilman (1986), Sonier et al. (1988), Quandalle and Sabathier (1989), Lim and Aziz (1995), and Rangel-German and Kovscek (2006), which are compared using a benchmark problem and the effects of gravity, capillary, number of matrix block subdomains and dual continuum media model are studied. The benchmark problem was adopted from Gilman (1986) and involves water... 

    Horizontal Well Modeling in Naturally Fractured Reservoirs Using Dual Porosity-Dual Permeability Model

    , M.Sc. Thesis Sharif University of Technology Hajimirza, Sahand (Author) ; Taghizadeh Manzari, Mehrdad (Supervisor)
    Abstract
    In this article, we investigate the transient pressure response and production rate of horizontal wells in a dual porosity-dual permeability naturally fractured reservoir.First, the point source solution is derived in Laplace transform space and then pressure distribution and horizontal well response is obtained using the principle of superposition. In our model, despite of dual porosity model, matrix system is directly connected to horizontal wellbore as well as fracture system and has an influence on type curves characteristics. We also showed that type curves characteristics are affected by horizontal well length, well eccentricity, external boundary conditions, permeability and storavity... 

    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... 

    Investigating the mechanism of water inflow in gas wells in fractured gas reservoirs and designing a controlling method

    , Article SPE Production and Operations Symposium, Proceedings ; Vol. 1, issue , May , 2012 , p. 323-340 ; ISBN: 9781613992012 Jafari, I ; Jamshidi, S ; Masihi, M ; Sharif University of Technology
    Abstract
    The coning phenomenon usually occurs in water and gas cap drive reservoirs. Water coning in Iranian hydrocarbon reservoirs is one of the most important problems that affects the cumulative production, operation costs and causes environmental problems. Before producing from a reservoir, its fluids are in equilibrium and their contact surfaces remain unchanged, but after starting production from the reservoir, when the viscous force overcome gravitational force in vertical direction, contact surfaces will displace and coning will occur. So, the production rates will be controlled in a range that prevents entering water and gas to the production well. For this reason, investigation and modeling... 

    Investigating the mechanism of water inflow in gas wells in fractured gas reservoirs and designing a controlling method

    , Article SPE Production and Operations Symposium, Proceedings ; Volume 1 , 2012 , Pages 323-340 ; 9781622761272 (ISBN) Jafari, I ; Jamshidi, S ; Masihi, M ; Sharif University of Technology
    SPE  2012
    Abstract
    The coning phenomenon usually occurs in water and gas cap drive reservoirs. Water coning in Iranian hydrocarbon reservoirs is one of the most important problems that affects the cumulative production, operation costs and causes environmental problems. Before producing from a reservoir, its fluids are in equilibrium and their contact surfaces remain unchanged, but after starting production from the reservoir, when the viscous force overcome gravitational force in vertical direction, contact surfaces will displace and coning will occur. So, the production rates will be controlled in a range that prevents entering water and gas to the production well. For this reason, investigation and modeling... 

    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... 

    Modeling of Two Phase Flow in Horizontal Well Coupling Natural Fracture Reservoir

    , M.Sc. Thesis Sharif University of Technology Zohrabi Allah Koohi, Ahmad (Author) ; Shad, Saeed (Supervisor)
    Abstract
    Today due to increasing demand of using energy and petroleum products, finding optimum ways to produce more oil and gas in a way which petroleum reservoirs faces less pressure drop is very necessary. Therefore, petroleum engineers face multiphase flow proportionally more than other issues. So, they have to comprehend this issue in a complete manner in order to discover the best practical ways for maximum utilization. Researchers in different ways tried to model multiphase flow, but many of provided models are so complicated and sometimes have low accuracy. In this project we tried to present a model that in simplicity has high accuracy and works in a way that apperceiving it, is very... 

    The Effect of Different Stresses in the Three Principal Directions on Horizontal Fractured Formation

    , M.Sc. Thesis Sharif University of Technology Talaei Mosbat, Masoud (Author) ; Goodarznia, Iraj (Supervisor)
    Abstract
    Nowadays, we know that many hydrocarbon reservoirs are fractured regarding this, the investigation of the properties of these reservoirs is necessary to predict the storage, production and the drilling methods. To identify fractured reservoirs, the fracture properties and their geometries under different conditions should be investigated. Besides, the evaluation of the behavior of induced fractures in distinct under ground conditions is very important. The Mechanical properties of the drilling bed like crack propagation, layer and mass rock is impactful in planning of drilling process and hydraulic fracturing operation. In this research, at first we introduce natural and induced fractures... 

    , M.Sc. Thesis Sharif University of Technology Reza Veisi, Mohsen (Author) ; Ghotbi, Siroos (Supervisor) ; Ayatollahi, Shahabedin (Co-Advisor)
    Abstract
    In water drive or waterflooded reservoirs, a significant amount of oil is remained in the reservoir as the residual oil. A process known as gas assisted gravity drainage, in its tertiary mode, has been applied in a number of conventional reservoirs to recover this residual oil. Gravity drainage is the main mechanism of oil recovery in the gas assisted gravity drainage enhanced oil recovery process. Previous investigations has shown that gravity force, spreading coefficient, three phase capillary pressure and reservoir wettability have significant effect on oil recovered via this process. The feasibility of using such a process in a naturally fractured reservoir is investigated in this work... 

    Experimental Investigation of Mud-Induced Formation Damage in Fractured Reservoirs

    , M.Sc. Thesis Sharif University of Technology Bagheri, Abdolhossein (Author) ; Rashtchian, Davood (Supervisor) ; Moghadasi, Jamshid (Supervisor)
    Abstract
    Productivity reduction of oil and gas wells due to mud induced permeability impairment is one of challenging problems in drilling and production studies. This phenomenon is of prime importance in fractured reservoirs in which high permeability fracture networks act as conduits for feeding gas or oil from a tight matrix to the wellbore. Up to now, many experimental and modeling investigations have been done in formation damage in conventional reservoirs. But in spite of large contribution of fractured reservoirs in total hydrocarbon reserves, there is very little work reported in the literature investigating formation damage in such reservoirs. In this thesis, the effective parameters in...