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    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... 

    Numerical modeling and simulation of drilling cutting transport in horizontal wells

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 8, Issue 2 , 2018 , Pages 455-474 ; 21900558 (ISSN) Zakerian, A ; Sarafraz, S ; Tabzar, A ; Hemmati, N ; Shadizadeh, S. R ; Sharif University of Technology
    Springer Verlag  2018
    Abstract
    Cutting transport is an important goal in drilling operation especially in horizontal and deviated wells since it can cause problems such as stuck pipe, circulation loss and high torque and drag. To this end, this article focused on the affecting parameters on the cutting transport by computational fluid dynamic (CFD) modeling and real operational data. The effect of drilling fluid and cutting density on the pressure drop, deposit ratio and string stress on the cutting transport has been investigated. A systematic validation study is presented by comparing the simulation results against published experimental database. The results showed that by increasing two times of drilling fluid... 

    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... 

    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... 

    Experimental Study of Formation Damage Reduction during Drilling of Horizontal Wells Using Nanoparticles

    , M.Sc. Thesis Sharif University of Technology Shojaei, Nima (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    One the basic challenges during drilling of both vertical and horizontal wellbores is due to mud filtrate invasion into the formation. Addition of nanoparticles to composition of drilling fluid has been recognized as a measure of control and reduction of filtrate invasion. Despite notable advances in formulation of nano-enhanced drilling fluids, effects of surface wettability of nanoparticles on their performance have not been studied with any precision. Moreover, return permeability of a grain packed porous media after extreme invasion by mud filtrate has not been experimentally measured in a radial system, yet. The last but not least, Generation and development of mud cake opposite the... 

    Simulation Study of Inflow Control Device

    , M.Sc. Thesis Sharif University of Technology Jokar, Mohammad Javad (Author) ; Shad, Saeed (Supervisor)
    Abstract
    Optimizing and improving the design of wells will have significant impact on any recovery method. As for horizontal wells, despite the fact that horizontal wells improve reservoir access, they suffer from significant pressure loss as well as limited flow control locations and flow control and management. In addition, reservoir quality varies along the length of the well and in the reservoir. This will add further complexity and challenge in well control and production optimization. The design of completions plays a significant role in improving the productivity of a well as well as the life of the reservoir. Intelligent or smart completions can be used to monitor, evaluate and manage the... 

    Numerical Modeling of Formation Damage Due to Filtrate Invasion into the Formation During Drilling Operations in Vertical and Horizontal Wells

    , M.Sc. Thesis Sharif University of Technology Khalili, Sajad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    Formation damage in oil and gas wells is mainly induced by drilling operations. Filtrate and particle invasion into formation as the sources of this damage caused serious problems, e.g. reduction of production rates. Therefore numerical modeling of this phenomenon helps us to better understand the process, and as a result, control and reduce formation damage associated with this impairment. In this research, a model to estimate the invasion depth and damage of mud filtrate from water-based mud is presented. Filtrate invasion into the formation is investigated by convection-diffusion equation with regard to dispersion term. The invasion depth is obtained from mud filtrate profile in the... 

    The semi-analytical modeling and simulation of the VAPEX process of ""Kuh-e-Mond"" heavy oil reservoir

    , Article Petroleum Science and Technology ; Vol. 29, issue. 5 , Oct , 2009 , p. 535-548 ; ISSN: 10916466 Rasti, F ; Masihi, M ; Kharrat, R ; Sharif University of Technology
    Abstract
    The vapor extraction process (or VAPEX) uses vaporized solvents injected into a horizontal well to form a vapor chamber within the reservoir. Vapor dissolves in the oil and enhances the oil production by decreasing the oil viscosity in heavy oil reservoirs. To evaluate the process we conduct a simulation study on an Iranian heavy oil reservoir called Kuh-e-Mond. In addition, a semi-analytical investigation of the VAPEX process has been performed. The idea is to perform VAPEX simulation for a laboratory model and find a methodology to compare the results of the simulator with the semi-analytical Butler's model. In particular, a semi-analytical dimensionless correlation for production rate... 

    A study of enhanced heavy oil recovery by two well cyclical steam assisted gravity drainage (TWC-SAGD) in conventional and fractured reservoirs

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Vol. 36, issue. 10 , Dec , 2014 , pp. 1065-1076 ; ISSN: 15567036 Ghoodjani, E ; Bolouri, S. H ; Sharif University of Technology
    Abstract
    Steam-assisted gravity drainage is one of the most promising strategies to develop huge heavy oil and bitumen accumulations. Like the other thermal processes, this method aims at reducing oil viscosity by increasing the temperature. But in an economical point of view, it requires a great volume of steam for injection. Moreover, early breakthrough of steam and high steam-oil ratio makes it uneconomical, especially in long production time. In this study, a new method, two wells cyclical steam-assisted gravity drainage is compared with a conventional steam-assisted gravity drainage process. Well configuration in two wells cyclical steam-assisted gravity drainage is the same as the... 

    The semi-analytical modeling and simulation of the VAPEX process of "Kuh-e-Mond" heavy oil reservoir

    , Article Petroleum Science and Technology ; Volume 29, Issue 5 , 2011 , Pages 535-548 ; 10916466 (ISSN) Rasti, F ; Masihi, M ; Kharrat, R ; Sharif University of Technology
    Abstract
    The vapor extraction process (or VAPEX) uses vaporized solvents injected into a horizontal well to form a vapor chamber within the reservoir. Vapor dissolves in the oil and enhances the oil production by decreasing the oil viscosity in heavy oil reservoirs. To evaluate the process we conduct a simulation study on an Iranian heavy oil reservoir called Kuh-e-Mond. In addition, a semi-analytical investigation of the VAPEX process has been performed. The idea is to perform VAPEX simulation for a laboratory model and find a methodology to compare the results of the simulator with the semi-analytical Butler's model. In particular, a semi-analytical dimensionless correlation for production rate... 

    CFD-DEM approach to investigate the effect of drill pipe rotation on cuttings transport behavior

    , Article Journal of Petroleum Science and Engineering ; Volume 127 , 2015 , Pages 229-244 ; 09204105 (ISSN) Akhshik, S ; Behzad, M ; Rajabi, M ; Sharif University of Technology
    Abstract
    Increasing cuttings bed height is a serious concern during extended-reach well drilling. In order to predict and prevent cuttings bed height increase, it is essential to study how the critical parameters influence the cuttings transport, especially the drill pipe rotation effects on the cuttings transport process. In conventional models for cuttings transport, the dynamic behavior of particles due to drill pipe rotation is neglected or empirically simplified. This paper presents a coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) approach to simulate the cuttings transport considering the dynamic collision process. The fluid phase is treated as an Eulerian continuum... 

    Liquid-Liquid Two Phase Flow in Horizontal Well on Bottom Hole Condition: Creation a Visualized Flow Regime for Two Phase (Liquid-liquid) Flow

    , M.Sc. Thesis Sharif University of Technology Yousefi Rad, Sasan (Author) ; Ghoodarznia, Iraj (Supervisor)
    Abstract
    The concurrent flow of oil and water is a common occurrence in the field of multiphase flow in different fields including petroleum industry. In such conditions an accurate assessment of pressure loss inside the well plays a vital role in efficient and effective production planning. Changes in well orientation, wellbore diameter, reservoir and fluid properties as well as fluid flow rates are among parameters in which will affect the flow patterns that can occur inside a well during its life time. These flow patterns are created as a result of a competition between viscous, gravity and capillary forces. Due to the fact that the dominant forces vary for different flow regimes, the pressure... 

    Modeling and Simulation of Multiphase Flow of Drilling Fluid in related to Drilling Cutting Transport in Horizontal Wells

    , M.Sc. Thesis Sharif University of Technology Akhavansafar, Amir (Author) ; Taghikhani, Vahid (Supervisor) ; Shadizadeh, Reza (Supervisor)
    Abstract
    Transport of drilling cutting to the surface is the most important function of drilling fluid. Insufficient hole cleaning leads to accumulation of cuttings in the annulus especially of a Horizontal wellbore. This may cause severe drilling problems including reduction in rate of penetration, stuck pipe, premature bit wear, increase the mud lost, high drag and torque. In this research work a mathematical model is developed to simulate cutting transport process in the horizontal drilling wells. A three-layer model was used to simulate cutting transport process in horizontal wellbores: a stationary at the bottom of hole, a moving bed and a suspension layer on top of these layers. In this model,... 

    Modeling and Laboratory Evaluation of Rheological Properties of Water based Mud for Horizontal Extended Reach Well

    , M.Sc. Thesis Sharif University of Technology Latifi Shirdar, Babak (Author) ; Taghikhani, Vahid (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Tahmasbi Nowtarki, Koroush (Co-Supervisor) ; Kalhor, Mojtaba (Co-Supervisor)
    Abstract
    One of the most important challenges in drilling horizontal and directional wells is the optimization of hydraulics and hole cleaning and ECD management. In these wells, poor hole cleaning can lead to formation of cutting bed on the low side of the annulus and cause problems such as stuck pipe or increase in torque and drag. Also poor hydraulic design can lead to decrease in rate of penetration and thus, increase in costs. Mud weight should be placed inside the range of mud window (more than pore pressure and less than formation fracture pressure) in order to prevent kick of reservoir fluid or mud loss.In this thesis, the main goal is to optimize hydraulics and hole cleaning and manage ECD... 

    The effect of geometrical properties of reservoir shale barriers on the performance of Steam-assisted Gravity Drainage (SAGD)

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 34, Issue 23 , 2012 , Pages 2178-2191 ; 15567036 (ISSN) Fatemi, S. M ; Sharif University of Technology
    Abstract
    Many bitumen reservoirs contain shale layers of varying thickness, lateral extent, and frequency. These shale layers, depending on their size, vertical and horizontal locations, and continuity throughout the reservoir, may act as a flow barrier and severely reduce vertical permeability of the pay zone and slow down the steam-assisted gravity drainage steam chamber development. Therefore, to improve productivity in these reservoirs, understanding of the effects of reservoir heterogeneities has become necessary. This work presents numerical investigation of the effects of shale barriers on steam-assisted gravity drainage performance when applied to produce mobile heavy oil. The most concern of... 

    On the particle–particle contact effects on the hole cleaning process via a CFD–DEM model

    , Article Particulate Science and Technology ; 2016 , Pages 1-8 ; 02726351 (ISSN) Akhshik, S ; Behzad, M ; Rajabi, M ; Sharif University of Technology
    Taylor and Francis Inc 
    Abstract
    The accurate and precise computational models in order to predict the hole cleaning process is one of the helpful assets in drilling industries. Besides the bulk properties such as the flow velocity, particles average size, cleaning fluid properties, etc., that will affect the cleaning process, there is an unanswered question about the microscopic properties of the particles, particularly those which determines the contact characteristics: Do those play a major role or not? The rudimentary answer is not. The first purpose of the present work is to answer this question via a developed computational fluid dynamics coupled with discrete element method (CFD–DEM) in which the six unknown rolling... 

    Study the effect of connectivity between two wells on secondary recovery efficiency using percolation approach

    , Article 15th European Conference on the Mathematics of Oil Recovery, ECMOR 2016, 29 August 2016 through 1 September 2016 ; 2016 ; 9462821933 (ISBN); 9789462821934 (ISBN) Sadeghnejad, S ; Masihi, M ; King, P. R ; Gago, P. A ; Sharif University of Technology
    European Association of Geoscientists and Engineers, EAGE  2016
    Abstract
    Estimating available hydrocarbon to be produced during secondary oil recovery is an ongoing activity in field development. The primary plan is normally scheduled during early stage of field's life through master development plan studies. During this period, due to the lake of certain data, estimation of the field efficiency is usually based on rules of thumb and not detailed field characterization. Hence, there is a great motivation to produce simpler physically-based methodologies. The minimum necessity inputs of percolation approach make it a useful tool for foration performance prediction. This approach enables us to attain a better assessment of the efficiency of secondary recovery... 

    Feasibility study on application of the recent enhanced heavy oil recovery methods (VAPEX, SAGD, CAGD and THAI) in an iranian heavy oil reservoir

    , Article Petroleum Science and Technology ; Volume 35, Issue 21 , 2017 , Pages 2059-2065 ; 10916466 (ISSN) Heidary, S ; Dehghan, A. A ; Mahdavi, S ; Sharif University of Technology
    Abstract
    Enhanced oil recovery (EOR) methods assisted by gravity drainage mechanism and application of sophisticated horizontal wells bring new hope for heavy oil extraction. Variety of thermal and non-thermal EOR techniques inject an external source of energy and materials such as steam, solvent vapor, or gas through a horizontal well at the top of the reservoir to reduce in-situ heavy oil viscosity. So, the diluted oil becomes mobile and flows downwards by gravity drainage to a horizontal producer located at the bottom of the reservoir. In this paper, a sector model of an Iranian fractured carbonate heavy oil reservoir was provided to simulate and evaluate capability of some EOR techniques such as... 

    Nonlinear multivariable modeling and stability analysis of vibrations in horizontal drill string

    , Article Applied Mathematical Modelling ; Volume 71 , 2019 , Pages 525-542 ; 0307904X (ISSN) Salehi, M. M ; Moradi, H ; Sharif University of Technology
    Elsevier Inc  2019
    Abstract
    Nowadays, economical extraction of the oil and gas, and their products is an important problem. Up to now, vertical wells have been used for oil extraction but some wells exist that they cannot be reached by using the vertical drilling. Horizontal and directional drillings are some techniques to reach these wells. In this article, dynamics of the horizontal drill string is studied. According to the forces that affect the dynamics of drilling, its longitudinal vibration is analyzed. After determination of the boundary conditions and normal modes of the system with using mode summation method, displacement of the bit is obtained. Finally, dynamics of the horizontal drill string is simulated... 

    Pressure and rate transient modeling of multi fractured horizontal wells in shale gas condensate reservoirs

    , Article Journal of Petroleum Science and Engineering ; Volume 185 , 2020 Dahim, S ; Taghavinejad, A ; Razghandi, M ; Rahimi Rigi, H ; Moeini, K ; Jamshidi, S ; Sharifi, M ; Sharif University of Technology
    Elsevier B.V  2020
    Abstract
    Gas condensate production using technology of multi-stage hydraulically fracturing in shale gas condensate reservoirs' horizontal wells is a new topic of unconventional resources studies. Thus, shale gas condensate as a new source of energy can be considered as an important issue for development and further studies. In this work, a semi-analytical solution of gas and oil two-phase flow is presented for pressure transient analysis (PTA) and rate transient analysis (RTA) of a shale gas condensate reservoir's production data. Fluid flow assumption here is flow in a pseudo triple-porosity porous media, which are matrix, natural fractures and adsorbed gas. Adsorbed gas is a form of gas in porous...