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    Use of Data Assimilation Methods for Multiphase Flow in Porous Media

    , M.Sc. Thesis Sharif University of Technology Najafi, Hossein (Author) ; Rajabi Ghahnavieh, Abbas (Supervisor) ; Bazargan, Hamid (Co-Supervisor)
    Abstract
    The importance of optimizing the extraction process of available resources increases each day due to the increasing energy consumption and the lack of energy resources. Oil and gas are one of the most important sources of energy. Although existing oil and gas resources are thought to be sufficient to meet the growing energy demand for the next few decades, given the non-renewable nature of these resources and the growing demand for oil and gas, it will become much harder to meet the future energy demand. Many existing oil fields are now in the process of maturing, and the discovery of large new oil fields is rare. As a result, new technologies must be used in the future to meet this demand,... 

    A stochastic well-test analysis on transient pressure data using iterative ensemble Kalman filter

    , Article Neural Computing and Applications ; 2017 , Pages 1-17 ; 09410643 (ISSN) Bazargan, H ; Adibifard, M ; Sharif University of Technology
    2017
    Abstract
    Accurate estimation of the reservoir parameters is crucial to predict the future reservoir behavior. Well testing is a dynamic method used to estimate the petro-physical reservoir parameters through imposing a rate disturbance at the wellhead and recording the pressure data in the wellbore. However, an accurate estimation of the reservoir parameters from well-test data is vulnerable to the noise at the recorded data, the non-uniqueness of the obtained match, and the accuracy of the optimization algorithm. Different stochastic optimization methods have been applied to this address problem in the literature. In this study, we apply the recently developed iterative ensemble Kalman filter in the... 

    A stochastic well-test analysis on transient pressure data using iterative ensemble Kalman filter

    , Article Neural Computing and Applications ; Volume 31, Issue 8 , 2019 , Pages 3227-3243 ; 09410643 (ISSN) Bazargan, H ; Adibifard, M ; Sharif University of Technology
    Springer London  2019
    Abstract
    Accurate estimation of the reservoir parameters is crucial to predict the future reservoir behavior. Well testing is a dynamic method used to estimate the petro-physical reservoir parameters through imposing a rate disturbance at the wellhead and recording the pressure data in the wellbore. However, an accurate estimation of the reservoir parameters from well-test data is vulnerable to the noise at the recorded data, the non-uniqueness of the obtained match, and the accuracy of the optimization algorithm. Different stochastic optimization methods have been applied to this address problem in the literature. In this study, we apply the recently developed iterative ensemble Kalman filter in the... 

    Simulation of Carbonate Reservoir Acidizing Using Fractured Reservoir Theory

    , M.Sc. Thesis Sharif University of Technology Karimi, Ali (Author) ; Bazargan, Mohammad (Supervisor)
    Abstract
    The process of injecting acid or acidizing, is one of the most common ways to stimulate oil and gas wells. The purpose of this process is to increase the productivity of the well by increasing the permeability of the reservoir rock around the well. This is especially important in carbonate reservoirs due to damage to the formation and low intrinsic permeability in some places. In order to minimize the effects of structural damage, conventional wormhole channels are created to pass through the injured area. One of the important factors in acid validation is achieving optimal injection rate, which means obtaining the highest permeability with the lowest amount of injected acid.Numerous... 

    Construction of an Experimental Device for Foaming Agent and an Experimental Study of the Properties of Foaming Agent

    , M.Sc. Thesis Sharif University of Technology Mohammad Karami (Author) ; Bazargan, Mohammad (Supervisor)
    Abstract
    The primary purpose of acidizing operations in the oil and gas industry is to enhance hydrocarbon production. Acidizing has been a common and conventional method for years, especially when production engineers face issues like declining reservoir pressure leading to reduced production rates. Initially, the treatment solution is referred to as matrix acidizing. In acidizing operations, different additives are combined with the acid to control its behavior in the reservoir. These additives may include iron control agents, corrosion inhibitors, friction reducers, and more. Incompatibility among these additives, the acid, and reservoir fluids can lead to severe damage to the reservoir.... 

    Simulation of Acid Injection Into a Carbonate Porous Medium Using the DBS Method and Investigation of Its Compatibility with Laboratory Results

    , M.Sc. Thesis Sharif University of Technology Jalalian, Elaheh (Author) ; Bazargan, Mohammad (Supervisor)
    Abstract
    Acidizing is a widely used well stimulation technique designed to mitigate formation damage and enhance oil and gas production. The effectiveness of acidizing operations relies on meticulous design. Consequently, before implementation, it is essential to create an optimal operational plan using suitable laboratory tools and numerical methods to maximize efficiency. Numerous studies have been conducted to investigate and model wormhole propagation in carbonate rocks, including commonly used two-scale continuum models. Although these models effectively predict physical behavior, the numerous parameters involved complicate history matching with laboratory results, potentially leading to... 

    Abstractive Persian User Reviews Summarization in the Frameworks of Graph Data Structure and Complex Networks

    , M.Sc. Thesis Sharif University of Technology Bazargan, Sara (Author) ; Khosravizadeh, Parvaneh (Supervisor)
    Abstract
    With the rapid development in information-communication technologies a huge amount of electronic documents has been produced and increase everyday in the world wide web. According to this wide information environment, summarization is critical for the users who digest this electronic big data. This research proposes two graph-based abstractive models for summarizing the Persian texts. A good summary should cover the overall context and the important subjects, and should be properly readable and coherent as well. Some permanent challenges in automatic text summarizations intended to increase the readability of output text, as well as covering all the main topics, and minimize the redundancy.... 

    Prediction of waterflood performance using a modified capacitance-resistance model: A proxy with a time-correlated model error

    , Article Journal of Petroleum Science and Engineering ; Volume 198 , March , 2020 Mamghaderi, A ; Aminshahidy, B ; Bazargan, H ; Sharif University of Technology
    Elsevier B. V  2020
    Abstract
    Capacitance-Resistive Model (CRM), as a fast yet efficient proxy model, suffers from some limitations in modeling relatively complex reservoirs. Some current improvements on this proxy made it a more powerful simulator with updating parameters over time. However, the model's intrinsic uncertainty arisen from simplifying fluid-flow modeling by some limited number of constant parameters is not addressed yet. In this study, this structural limitation of CRM has been addressed by introducing a time-correlated model error, including stochastic and non-stochastic parameters, embedded into this proxy's formulation. The error term's non-stochastic parameters have been tuned to be used in forecasting... 

    Error behavior modeling in Capacitance-Resistance Model: A promotion to fast, reliable proxy for reservoir performance prediction

    , Article Journal of Natural Gas Science and Engineering ; Volume 77 , May , 2020 Mamghaderi, A ; Aminshahidy, B ; Bazargan, H ; Sharif University of Technology
    Elsevier B. V  2020
    Abstract
    Using the original form of Capacitance-Resistance Model (CRM), as a waterflooding performance prediction tool, for modeling real reservoirs makes some unavoidable errors. Combination of this model with available data assimilation methods yields more powerful simulation tool with updating parameters over time. However, the inherent uncertainty arisen by modeling complex reservoirs with only a limited number of CRM parameters is not addressed yet. In this study, the model error behavior has been simulated through a physically-based dynamical system in which it has been correlated with the original model parameters. The ensemble-based Kalman filter (EnKF) data assimilation method has been... 

    Geochemical Simulation of Acidizing Sandstone Core Samples

    , M.Sc. Thesis Sharif University of Technology Khojasteh Mehr, Mohammad (Author) ; Bazargan, Mohammad (Supervisor)
    Abstract
    Acidizing is one of the widely used practices of formation damage remediation. The success of this rather expensive job depends on the precise design and operation. Though, improper execution of an acid job, not only does not improve the formation damage but also can contribute to even more damage itself. For this purpose, it is critically important to thoroughly design an acidizing job conducting extensive lab experiments and utilizing numerical tools before operation in order for a successful acidizing. Unlike, carbonate acidizing, the chemistry of sandstone acidizing is very complex and challenging because of the wide variety of minerals and aqueous species present in the system. Hence, a... 

    Localization length-doping dependence in GdBa2Cu3-xCrxO7-δ

    , Article Physica C: Superconductivity and its Applications ; Volume 466, Issue 1-2 , 2007 , Pages 157-162 ; 09214534 (ISSN) Bazargan, S ; Javanmard, H ; Akhavan, M ; Sharif University of Technology
    2007
    Abstract
    The bulk samples of GdBa2Cu3-xCrxO7-δ with x = 0-0.3 have been prepared by the conventional solid-state reaction method. Structural phases were determined by powder X-ray diffraction. The XRD and the unit cell parameters were obtained through Rietveld refinement of the XRD data. By increasing the doping, the c parameter decreases and the a parameter increases, and by the nearly fixed b parameter, the orthorhombic phase approaches to the tetragonal phase. The resistivity measurements show a strong effect of doping on suppression of Tc. At the first doping step of x = 0.05, Tc decreases abruptly to 57 K, but by increasing the doping, this rate slows down and becomes nearly linear for higher... 

    Prediction of waterflood performance using a modified capacitance-resistance model: A proxy with a time-correlated model error

    , Article Journal of Petroleum Science and Engineering ; Volume 198 , 2021 ; 09204105 (ISSN) Mamghaderi, A ; Aminshahidy, B ; Bazargan, H ; Sharif University of Technology
    Elsevier B.V  2021
    Abstract
    Capacitance-Resistive Model (CRM), as a fast yet efficient proxy model, suffers from some limitations in modeling relatively complex reservoirs. Some current improvements on this proxy made it a more powerful simulator with updating parameters over time. However, the model's intrinsic uncertainty arisen from simplifying fluid-flow modeling by some limited number of constant parameters is not addressed yet. In this study, this structural limitation of CRM has been addressed by introducing a time-correlated model error, including stochastic and non-stochastic parameters, embedded into this proxy's formulation. The error term's non-stochastic parameters have been tuned to be used in forecasting... 

    A novel approach to generating extended depth of focus beams using a phase mask

    , Article Frontiers in Optics, FiO 2006, Rochester, NY, 10 October 2006 through 10 October 2006 ; 2006 ; 21622701 (ISSN); 1557528187 (ISBN); 9781557528186 (ISBN) Massoumian, F ; Shamsi, D ; Bazargan, H ; Sharif University of Technology
    Optical Society of America (OSA)  2006
    Abstract
    We present a novel method in which a phase mask is used to modulate a beam in order to produce a large extension in the focal depth at the focus of a lens. © 2005 Optical Society of America  

    Duty-cycle controller for low-jitter frequency-doubling DLL

    , Article IEE Proceedings: Circuits, Devices and Systems ; Volume 152, Issue 5 , 2005 , Pages 411-416 ; 13502409 (ISSN) Tajalli, A ; Atarodi, M ; Bazargan, H ; Sharif University of Technology
    2005
    Abstract
    This article introduces a novel duty-cycle control circuit (DCC) preceding a delay-locked loop (DLL)-based clock frequency multiplier preventing the output duty-cycle over process, supply voltage and temperature (PVT) variations. However, the proposed DCC eliminates the effect of input duty-cycle variation and, hence, decreases the sensitivity to the input jitter and distortion. The circuit realisation in 0.5-μm CMOS technology shows that the duty-cycle variation at the output clock is less than 2.7%, while driving the digital section of a CODEC chip and also test pads. The analysis, confirmed by measurements, shows a stable and accurate response for the proposed clock generation unit (CGU).... 

    Using the laser irradiation to improve the rate of production of Iran South West formation

    , Article Society of Petroleum Engineers - Kuwait International Petroleum Conference and Exhibition 2012, KIPCE 2012: People and Innovative Technologies to Unleash Challenging Hydrocarbon Resources ; Volume 1 , 2012 , Pages 141-147 ; 9781622769766 (ISBN) Bazargan, M ; Habibpour, M ; Jalalyfar, H ; Geranmayehrad, A ; Sharif University of Technology
    2012
    Abstract
    Whole level of the erosion and the resistance of rocks which were composed closured have been studied, besides, the impact of temperature and laser irradiation for more investigation about this issue has been involved before all. This subject more reveals the matter which laser absorption on the laboratory scale using laser to what extent can cause the augment of the relative permeability and secondary porosity of reservoir rock, that of the vertical and horizontal useful connectivity and eventually that of the positive transferability. This research has been carried out in the form of case study on one of Iranian south west formations in north east of Behbahan city in Iran, either the rate... 

    Feasibility of using laser bit beside of common bits to drilling slim holes

    , Article Society of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand ; Volume 1 , 2013 , Pages 422-433 ; 9781627481762 (ISBN) Bazargan, M ; Jalalyfar, H ; Koohian, A ; Habibpour, M ; Sharif University of Technology
    2013
    Abstract
    The capability level of rotary as well as first generation drilling operation could not be matched for deeply drilling programs. To reach that deep, the increasing in drill string length could also cause an additional constraint on hydraulic performance. The operation of slim hole drilling has significant potential to reduce well costs. This cost might be savings are especially important with increased demand for reduced capital finance under current economic conditions in the Iranian oil and gas industry. This savings achievement could be caused by use of smaller drilling rigs, work over rigs, reduced casing size, reducing requirement for drilling consumables and other costs associated with... 

    Development of Multi-objective Optimization Framework for Non-vertical Well Placement

    , M.Sc. Thesis Sharif University of Technology Rostamian, Aref (Author) ; Bazargan, Mohammad (Supervisor) ; Jamshidi, Saeed (Supervisor)
    Abstract
    An important step in the early stages of an oilfield development is the accurate identification of the location of production and injection wells which has a significant impact on productivity and profitability of the reservoir. Recently, operation companies in petroleum industry focus on production optimization, recovery enhancement and cost reduction; as a result, application of non-conventional wells (NCW) or non-vertical wells have dramatically increased. Well placement optimization is a complicated task as it is a function of several contributing factors including reservoir heterogeneities and economic constraints. The complexity of this task increases when it is considered as a... 

    CFD Simulation of Rotating Disk Apparatus for Determining Reaction Equation Parameters of VES and Carbonate Minerals

    , M.Sc. Thesis Sharif University of Technology Ghasemi, Esmaeil (Author) ; Bazargan, Mohammad (Supervisor) ; Jamshidi, Saeed (Supervisor)
    Abstract
    Acidizing operation is performed in oil and gas reservoirs with the aim of overcoming formation damages, increasing permeability and reducing skin factor. In carbonate reservoir, the hydrochloric acid increases the permeability of the areas around the well to a more than its initial value by dissolving part of the formation minerals. Considering that most of Iran's oil and gas reservoirs are in the category of carbonate reservoirs, it is important to study the reaction kinetics of carbonate minerals and acids used in acidizing operation. The complex and multifactorial nature of the acidizing operation in the reservoirs has made it very difficult to design a successful and optimal operation.... 

    Simulation of Carbonate Matrix Acidizing Using Arbitrary Lagrangian Eulerian (ALE)at Darcy Scale

    , M.Sc. Thesis Sharif University of Technology Goudarzi, Mojtaba (Author) ; Jamshidi, Saeed (Supervisor) ; Bazargan, Mohammad (Supervisor)
    Abstract
    Injection of acid into the carbonate rock dissolves the rock, and the porous medium is constantly changing. As a result, the boundaries between the acid and the porous medium, which are in fact the interface between the solid phase and the liquid phase, are constantly changing. Therefore, on the issue of acid injection into carbonate rock, we are facing dynamic boundary conditions. Also, due to the simultaneous solution of transfer and reaction phenomena, modeling acid injection into carbonate rock faces many challenges.In such problems, the ALE method, which is a combination of the best features of the Lagrangian method and the Eulerian method, offers a very precise solution and is used as... 

    An enriched FEM technique for modeling hydraulically driven cohesive fracture propagation in impermeable media with frictional natural faults: Numerical and experimental investigations

    , Article International Journal for Numerical Methods in Engineering ; Volume 104, Issue 6 , 2015 , Pages 439-468 ; 00295981 (ISSN) Khoei, A. R ; Hirmand, M ; Vahab, M ; Bazargan, M ; Sharif University of Technology
    John Wiley and Sons Ltd  2015
    Abstract
    In this paper, an enriched finite element technique is presented to simulate the mechanism of interaction between the hydraulic fracturing and frictional natural fault in impermeable media. The technique allows modeling the discontinuities independent of the finite element mesh by introducing additional DOFs. The coupled equilibrium and flow continuity equations are solved using a staggered Newton solution strategy, and an algorithm is proposed on the basis of fixed-point iteration concept to impose the flow condition at the hydro-fracture mouth. The cohesive crack model is employed to introduce the nonlinear fracturing process occurring ahead of the hydro-fracture tip. Frictional contact is...