Search for: depositional-environment
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    Effect of selected parameters on the depositional behaviour of turbidity currents

    , Article Journal of Hydraulic Research ; Volume 50, Issue 1 , Dec , 2012 , Pages 60-69 ; 00221686 (ISSN) Khavasi, E ; Afshin, H ; Firoozabadi, B ; Sharif University of Technology
    Turbidity currents containing kaolin particles were studied experimentally in a channel and the velocity and concentration profiles were measured using an acoustic Doppler velocimeter. These experiments were performed to investigate the depositional behaviour of turbidity currents. The suspended sediment flux was evaluated by experimental and analytical methods and the results of these two methods were in a good agreement. To evaluate the suspended sediment flux, it was necessary to recognize the suspended sediment zone from the upper shear layer region and near the bed depositional area as well. The method of determination of these areas is discussed. The effects of important parameters... 

    Introducing a method for calculating water saturation in a carbonate gas reservoir

    , Article Journal of Natural Gas Science and Engineering ; Volume 70 , 2019 ; 18755100 (ISSN) Movahhed, A ; Nabi Bidhendi, M ; Masihi, M ; Emamzadeh, A ; Sharif University of Technology
    Elsevier B.V  2019
    Cementation factor greatly affects water saturation estimation. Factors such as depositional environment, diagenesis and depositional architecture make the estimation of water saturation a big challenge in carbonate reservoirs. The current study is introduced a method for calculating cementation factor in Archie formula. First, (MRGC) technique was applied on the (NMR) logging parameters along with (NDS) data to obtain the optimum number of clustering. After that, fuzzy logic method was applied on conventional log parameters obtained from the wells without any NMR log data. In the third part of the study, a novel crossplot introduced including compressional to shear-wave velocity ratio... 

    A coupled geochemical and fluid flow model to simulate permeability decline resulting from scale formation in porous media

    , Article Applied Geochemistry ; Volume 107 , 2019 , Pages 131-141 ; 08832927 (ISSN) Shabani, A ; Kalantariasl, A ; Abbasi, S ; Shahrabadi, A ; Aghaei, H ; Sharif University of Technology
    Elsevier Ltd  2019
    Scale precipitation due to the mixing of incompatible injected water with formation brine and its subsequent deposition in porous media is an unpleasant phenomenon in water injection projects that can lead to severe injectivity and productivity decline. As a result of the complexity of geochemical reactions, modelling scale precipitation and deposition is a challenge. This paper presents a coupled geochemical and fluid flow model to simulate reactive flow in porous media which models pressure difference increase resulting from scale formation during water injection into porous media. To simulate chemical reactions during scale formation and subsequent rock permeability decline, PHREEQC... 

    Modeling and simulation of barite deposition in an annulus space of a well using CFD

    , Article Journal of Petroleum Science and Engineering ; Volume 161 , 2018 , Pages 476-496 ; 09204105 (ISSN) Movahedi, H ; Shad, S ; Beagom Mokhtari Hosseini, Z ; Sharif University of Technology
    Elsevier B.V  2018
    In drilling industry, barite particles settling and barite sag as a major problem can potentially impose significant operational issues. Static conditions, in which well undergoes an extended shut-in period, could occur during different drilling and completion operations such fishing operation, tripping, and logging. Despite its importance, such phenomenon is not well understood yet. To avoid issues related to barite settlement and barite sag, a good understanding of the impact of different drilling parameters on barite settlement and sag phenomenon is required. Recently, the mathematical formulation and modeling of settlement and sag processes have gained more attention. In order to better... 

    Effect of salinity and ion type on formation damage due to inorganic scale deposition and introducing optimum salinity

    , Article Journal of Petroleum Science and Engineering ; Volume 177 , 2019 , Pages 270-281 ; 09204105 (ISSN) Ghasemian, J ; Riahi, S ; Ayatollahi, S ; Mokhtari, R ; Sharif University of Technology
    Elsevier B.V  2019
    Smart water injection is recognized as an effective EOR process to alter the wettability and interfacial tension to obtain higher micro/macro sweep efficiencies. This water contains reactive ions such asMg2+, Ca2+ andSO42- which can act as potential-determining ions and change the surface charge of calcite rocks. One of the major concerns in the execution of an effective water-flood process, especially in tight carbonate reservoirs, is the chemical incompatibility between the formation brine and the injecting water. In the present study, laboratory fluid compatibility tests were carried out and software simulation was done to investigate the most important challenges of the water-flooding...