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    Wettability alteration properties of fluorinated silica nanoparticles in liquid-loaded pores: An atomistic simulation

    , Article Applied Surface Science ; Volume 371 , 2016 , Pages 349-359 ; 01694332 (ISSN) Sepehrinia, K ; Mohammadi, A ; Sharif University of Technology
    Elsevier  2016
    Abstract
    Control over the wettability of reservoir rocks is of crucial importance for enhancing oil and gas recovery. In order to develop chemicals for controlling the wettability of reservoir rocks, we present a study of functionalized silica nanoparticles as candidates for wettability alteration and improved gas recovery applications. In this paper, properties of fluorinated silica nanoparticles were investigated in water or decane-loaded pores of mineral silica using molecular dynamics simulation. Trifluoromethyl groups as water and oil repellents were placed on the nanoparticles. Simulating a pore in the presence of trapped water or decane molecules leads to liquid bridging for both of the... 

    Wettability alteration of reservoir rocks to gas wetting condition: a comparative study

    , Article Canadian Journal of Chemical Engineering ; Volume 96, Issue 4 , April , 2018 , Pages 997-1004 ; 00084034 (ISSN) Erfani Gahrooei, H. R ; Ghazanfari, M. H ; Karimi Malekabadi, F ; Sharif University of Technology
    Wiley-Liss Inc  2018
    Abstract
    Productivity of gas condensate reservoirs reduces significantly due to the near wellbore condensate/water blockage phenomenon. A novel, permanent solution to alleviate this problem is near wellbore wettability alteration of reservoir rocks to preferentially gas wetting conditions; industrial chemical materials are good candidates for this purpose, because of their eco-friendly characteristics, economical price, and mass production. In this paper, a comparative study is conducted on two industrial fluorinated chemicals, MariSeal 800 and SurfaPore M. Static and dynamic contact angle measurements, spontaneous imbibition, and core flooding tests were conducted to investigate the effect of... 

    The impact of surfactants on wettability change and level of water imbibition in relation to EOR in carbonate reservoirs

    , Article Petroleum Science and Technology ; Volume 31, Issue 20 , 2013 , Pages 2098-2109 ; 10916466 (ISSN) Zangeneh Var, A ; Bastani, D ; Badakhshan, A ; Sharif University of Technology
    2013

    Index for characterizing wettability of reservoir rocks based on spontaneous imbibition recovery data

    , Article Energy and Fuels ; Vol. 27, issue. 12 , November , 2013 , p. 7360-7368 ; ISSN: 08870624 Mirzaei-Paiaman, A ; Masihi, M ; Standnes, D. C ; Sharif University of Technology
    Abstract
    An index for characterizing wettability of reservoir rocks is presented using slope analysis of spontaneous imbibition recovery data. The slope analysis is performed using the known exact analytical solution to infinite acting period of counter-current spontaneous imbibition. The proposed theoretically based wettability index offers some advantages over existing methods: (1) it is a better measure of the spontaneous imbibition potential of rock (because the magnitude is directly proportional to the imbibition rate); (2) there is no need for forced displacement data; (3) there is no need for waiting until the spontaneous imbibition process ceases completely; and (4) the data needed to run the... 

    Index for characterizing wettability of reservoir rocks based on spontaneous imbibition recovery data

    , Article Energy and Fuels ; Volume 27, Issue 12 , November , 2013 , Pages 7360-7368 ; 08870624 (ISSN) Mirzaei Paiaman, A ; Masihi, M ; Standnes, D. C ; Sharif University of Technology
    2013
    Abstract
    An index for characterizing wettability of reservoir rocks is presented using slope analysis of spontaneous imbibition recovery data. The slope analysis is performed using the known exact analytical solution to infinite acting period of counter-current spontaneous imbibition. The proposed theoretically based wettability index offers some advantages over existing methods: (1) it is a better measure of the spontaneous imbibition potential of rock (because the magnitude is directly proportional to the imbibition rate); (2) there is no need for forced displacement data; (3) there is no need for waiting until the spontaneous imbibition process ceases completely; and (4) the data needed to run the... 

    Effect of water salinity on oil/brine interfacial behaviour during low salinity waterflooding: A mechanistic study

    , Article Petroleum ; Volume 5, Issue 4 , 2019 , Pages 367-374 ; 24056561 (ISSN) Rostami, P ; Fattahi Mehraban, M ; Sharifi, M ; Dejam, M ; Ayatollahi, S ; Sharif University of Technology
    KeAi Communications Co  2019
    Abstract
    In recent years, controlling the salinity and composition of the injected water has become an emerging enhanced oil recovery (EOR) technique, often described as low salinity (LS) waterflooding. This work is done with the intention to contribute to the ongoing discussions about LS waterflooding mechanism(s). For this purpose, a series of different experiments were conducted. At first, the effect of salinity on the interfacial tension (IFT) and the contact angle was evaluated with a crude oil sample. Then to achieve more accurate results in observing oil/water interface, similar IFT experiments were also carried out on a synthetic oil containing asphaltenes. Thereafter, microscopic... 

    On the size-dependent behavior of drop contact angle in wettability alteration of reservoir rocks to preferentially gas wetting using nanofluid

    , Article Journal of Petroleum Science and Engineering ; Volume 178 , 2019 , Pages 1143-1154 ; 09204105 (ISSN) Azadi Tabar, M ; Ghazanfari, M. H ; Dehghan Monfared, A ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    Wettability alteration of rock surfaces toward gas wetting have been recognized as a practical approach for maximizing the production from the gas condensate reservoirs. Most of the reported work in this area applied the so called sessile drop contact angle measurement technique to examine the change in wetting state of a surface. However, the size-dependent wetting behavior of drop which could affect the exact determination of wettability and wettability changes was not well discussed in the previous studies. Therefore, in this work, the size dependency of contact angle for four different liquid-solid-gas systems; i.e., water-calcite-air, water-treated calcite-air (nanofluid treated... 

    Experimental and modeling study of wettability alteration through seawater injection in limestone: a case study

    , Article Petroleum Science ; Volume 17, Issue 3 , 2020 , Pages 749-758 Seiedi, O ; Zahedzadeh, M ; Roayaei, E ; Aminnaji, M ; Fazeli, H ; Sharif University of Technology
    China University of Petroleum Beijing  2020
    Abstract
    Water flooding is widely applied for pressure maintenance or increasing the oil recovery of reservoirs. The heterogeneity and wettability of formation rocks strongly affect the oil recovery efficiency in carbonate reservoirs. During seawater injection in carbonate formations, the interactions between potential seawater ions and the carbonate rock at a high temperature can alter the wettability to a more water-wet condition. This paper studies the wettability of one of the Iranian carbonate reservoirs which has been under Persian Gulf seawater injection for more than 10 years. The wettability of the rock is determined by indirect contact angle measurement using Rise in Core technique.... 

    Experimental study on enhanced oil recovery by low salinity water flooding on the fractured dolomite reservoir

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 40, Issue 5 , 2021 , Pages 1703-1719 ; 10219986 (ISSN) Ebrahimzadeh Rajaee, S ; Gerami, S ; Safekordi, A. A ; Bahramian, A. R ; Ganjeh Ghazvini, M ; Sharif University of Technology
    Iranian Institute of Research and Development in Chemical Industries  2021
    Abstract
    Enhanced Oil Recovery from carbonate reservoirs is a major challenge especially in naturally fractured formations where spontaneous imbibition is a main driving force. The Low Salinity Water Injection (LSWI) method has been suggested as one of the promising methods for enhanced oil recovery. However, the literature suggests that LSWI method, due to high dependence on rock mineralogy, injected and formation water salt concentration, and complexity of reactions is not a well-established technology in oil recovery from carbonate reservoirs. The underlying mechanism of LSWI is still not fully understood. Due to lack of LSWI study in free clay dolomite fractured reservoir, and to investigate of... 

    Surface wettability effect on the rising of a bubble attached to a vertical wall

    , Article International Journal of Multiphase Flow ; Volume 109 , 2018 , Pages 178-190 ; 03019322 (ISSN) Javadi, K ; Davoudian, S. H ; Sharif University of Technology
    Abstract
    This paper deals with the dynamics of rising bubbles attached to a vertical wall under different wettability conditions. Even though, bubbles rising freely in a liquid have extensively been studied, bubbles attached to a wall have not been fully understood. Therefore, in this work, rising bubbles attached to a vertical wall were numerically investigated by applying the ALE method along with adaptive mesh refinement schemes to properly resolve the bubble interface and its deformation. To consider wall wettability effects, different contact angles of 45° 90° and 105° were considered along with the case of freely rising bubbles. The problem was carried out at different Bond numbers of 0.27,... 

    An atomistic insight into the implications of ion-tuned water injection in wetting preferences of carbonate reservoirs

    , Article Journal of Molecular Liquids ; Volume 293 , 2019 ; 01677322 (ISSN) Koleini, M.M ; Badizad, M. H ; Ghatee, M. H ; Ayatollahi, S ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    The efficiency of water flooding methods is known to improve by applying ion-tuned water injection. Although there is a consensus that such improvement happens through reversing reservoir wettability characteristics to more water-wet state, the true impact of ions is still ambiguous among contradictory debates. The well-known molecular dynamics (MD) simulation techniques would shed light on such ambiguities to gain deep atomic-scale understanding of the process. Results from MD simulations show that the presence of Na+ and Cl¯ ions leads to the formation of an electrical double layer in adjacency of calcite surface while Mg2+ ions dominantly make complexes with hydrocarbons throughout the... 

    Interactions between Rock/Brine and Oil/Brine interfaces within thin brine film wetting carbonates: A molecular dynamics simulation study

    , Article Energy and Fuels ; Volume 33, Issue 9 , 2019 , Pages 7983-7992 ; 08870624 (ISSN) Koleini, M. M ; Badizad, M. H ; Kargozarfard, Z ; Ayatollahi, S ; Sharif University of Technology
    American Chemical Society  2019
    Abstract
    The thin brine film that wets rock surfaces governs the wettability of underground reservoirs. The ionic composition and salinity of this nanosized brine film influence the wetting preference of the rock pore space occupied by hydrocarbons. Despite numerous investigations over the last decades, a unanimous fundamental understanding that concerns the contribution of ions in the original wetting state of the reservoir is lacking and hence the mechanisms responsible for the wettability reversal of the mineral are still unclear. This wettability reversal is the main consequence of ion-Tuned waterflooding. Although the method is widely accepted in practice, there is no universal consensus on the... 

    Isolation and screening of Bacillus subtilis MJ01 for MEOR application: biosurfactant characterization, production optimization and wetting effect on carbonate surfaces

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 9, Issue 1 , 2019 , Pages 233-245 ; 21900558 (ISSN) Jahanbani Veshareh, M ; Ganji Azad, E ; Deihimi, T ; Niazi, A ; Ayatollahi, S ; Sharif University of Technology
    Springer Verlag  2019
    Abstract
    The bacterial strain MJ01 was isolated from stock tank water of one of the Iranian south oil field production facilities. The 16S rRNA gene of isolate, MJ01, showed 99% similarity to Bacillus subtilis. The results revealed that biosurfactant produced by this strain was lipopeptide-like surfactin based on FTIR analysis. Critical micelle concentration of produced surfactin in distilled water was 0.06 g/l. Wettability study showed that at zero salinity surfactin can change original oil-wet state to water-wet state, but in seawater salinity it cannot modify the wettability significantly. To utilize this biosurfactant in ex situ MEOR process, economical and reservoir engineering technical... 

    Investigating Wettability Alteration During MEOR Process

    , M.Sc. Thesis Sharif University of Technology Soleymani, Fatemeh (Author) ; Ayatollahi, Shahab (Supervisor) ; Kariminia, Hamid Reza (Supervisor)
    Abstract
    Microbial enhanced oil recovery (MEOR) is a collection of techniques that utilize microorganisms and their metabolic products to improve the recovery of crude oil from reservoir rock. From the advantages of this method, independency to the oil price and environmental benign can be mentioned. Many mechanisms have been proposed to contribute on MEOR, but still there is no enough knowledge about the mechanisms that causes inabilities in manipulating the process to get more oil production.
    In the present study, the effect of a native type of bacteria, Enterobacter cloacae, on the glass surfaces wettability which were aged in expose of model oil with different asphaltene concentration was... 

    Experimental Investigation on the Effect of Porous Media Wettability on Trapping and Hysteresis in Water/Oil Two Phase Flow System

    , M.Sc. Thesis Sharif University of Technology Firoozi, Mehdi (Author) ; Fatemi, Mobeen (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    Wettability of reservoir rock is one of the effective parameters in determining the mechanisms of production and consequently the amount of residual oil inside the porous media. In addition, the salinity of injected water is important factor in the recovery of reservoir oil in waterflooding.On the other hand, the role of the hysteresis on the residual oil saturation as well as the flow functions such as relative permeability curves is very important. In this project, the effects of reservoir wettability and injected water salinity on the hysteresis and residual oil saturation in two-phase water-oil flow systems are studied. Core-scale experiments were carried out using sandpacks and were... 

    Wettability alteration in carbonates during "Smart Waterflood": Underling mechanisms and the effect of individual ions

    , Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 487 , 2015 , Pages 142-153 ; 09277757 (ISSN) Rashid, S ; Mousapour, M. S ; Ayatollahi, S ; Vossoughi, M ; Beigy, A. H ; Sharif University of Technology
    Elsevier  2015
    Abstract
    There are increasing evidences that adjusting the chemistry of the injecting water improves the oil recovery efficiency. However, the underlying mechanisms for this technique which is referred to as "smart waterflood" have not yet been thoroughly understood. It is needed to explore the role of individual ions through set of different tests, to find the right mechanisms behind "smart waterflood". This study is focused on the fluid/solid (carbonate) interactions through systematic wettability measurement. Contact angle measurements accompanied by spontaneous imbibition tests were employed to determine the role of individual monovalent and divalent ions in wettability alteration process by... 

    Incorporation of viscosity scaling group into analysis of MPMS index for laboratory characterization of wettability of reservoir rocks

    , Article Journal of Petroleum Exploration and Production Technology ; Volume 7, Issue 1 , 2017 , Pages 205-216 ; 21900558 (ISSN) Mirzaei Paiaman, A ; Saboorian Jooybari, H ; Masihi, M ; Sharif University of Technology
    Springer Verlag  2017
    Abstract
    Wettability is a key parameter affecting petrophysical properties of reservoir rocks. Mirzaei-Paiaman et al. (Energy Fuels 27:7360–7368, 2013) presented an index (referred to as MPMS) for laboratory characterization of wettability of native- or restored-state reservoir rock samples. To use this index two counter-current spontaneous imbibition (COUCSI) experiments are needed, one on the native- or restored-state core sample and another on the strongly water-wet (SWW) reference system. Slope analysis of recovery data in these two systems gives inputs for determination of MPMS index. The two systems must have the same pore structure, initial water saturation, and viscosity ratio. The case of... 

    Efficiency improvement of solar stills through wettability alteration of the condensation surface: An experimental study

    , Article Applied Energy ; Volume 268 , 2020 Zanganeh, P ; Soltani Goharrizi, A ; Ayatollahi, S ; Feilizadeh, M ; Dashti, H ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    The condensation process is of great importance in many heat transfer devices in which a large amount of energy must be transferred. Furthermore, condensation is a crucial part of energy conversion and affects the energy efficiency of thermal desalination plants and solar stills. During the condensation process in solar stills, an essential part of the energy is transferred through the condensation surface to produce fresh water. Therefore, the condensation surface plays a significant role in the working efficiency of solar stills. The wettability of the condensation surface influences the condensation mechanism, which, in turn, affects the efficiency of solar stills. This study aims to... 

    Impact of ionic composition on modulating wetting preference of calcite surface: Implication for chemically tuned water flooding

    , Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 568 , 2019 , Pages 470-480 ; 09277757 (ISSN) Saeedi Dehaghani, A. H ; Badizad, M. H ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    Despite previous researches on ion-engineered waterflooding (IEWF), its underlying mechanisms are not fully understood, particularly in presence of additives, like surfactants. This paper concerned with the contribution of Ca 2+ , Mg 2+ , SO 4 2- and Na + into altering wettability of oil-wet carbonate minerals towards water preferred state. As a mechanistic study, an experiment workflow was conducted to probe the impact of ions' concentrations in SW, either with or without sodium dodecylbenzene sulfonate (SDBS) which is an anionic surfactant. At first, contact angle (CA) measurement was carried out to evaluate the degree of wettability reversal upon treating the oil-aged calcite slabs with... 

    Numerical Investigation of Motion of Nanodroplets on Wetting Gradient Surfaces

    , M.Sc. Thesis Sharif University of Technology Mohammadi, Ahmad (Author) ; Moosavi, Ali (Supervisor)
    Abstract
    A droplet placed on the boundary of two solids with different wettabilities will move to the more wettable part. This is a well-known phenomenon and has been extensively used in a variety of processes and applications ranging from biological systems and ink jet printing to the commercial lab-on-a-chip. Because of its importance, many studies are conducted around this phenomenon. The difference between the equilibrium contact angles of the droplet on the two parts gives rise to an interfacial driving force which moves the droplet. Such a motion is not continuous as the droplet slides to the more wettable area, the driving force diminishes and consequently the droplet stops. A non-stop motion...