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    Preformed particle gels of sulfonated polyacrylamide: preparation, characterization, and application as permeability modifier

    A Heidari, E Vasheghani-Farahani, M Vafaie-Sefti
    Journal Paper , , {Pages }

    Abstract

    Effect of Inorganic Polymer Gel Systems on Residual Resistance Factor in Fractured Core Model

    M Abedi Lenji, M Haghshenasfard, M Baghban Salehi, ...
    Journal Paper , , {Pages }

    Abstract

    Synthesis, structure and mechanical properties of nanocomposites based on exfoliated nano magnesium silicate crystal and poly (acrylamide)

    Z Azimi Dijvejin, A Ghaffarkhah, M Vafaie Sefti, MK Moraveji
    Journal Paper , , {Pages }

    Abstract

    Experimental study of polyacrylamide gel in close‐in well operation

    Arvin Hajipour, Mahsa Baghban Salehi, Mohsen Vafaie Sefti, Aghdas Heidari
    Journal PaperPolymers for Advanced Technologies , Volume 29 , Issue 4, 2018 April , {Pages 1278-1286 }

    Abstract

    An optimized polymer gel, known as temporary gel, based on polyacrylamide sulfonated copolymer, and a chromium acetate hydroxide were synthesized to close‐in the wells during applying well servicing work. Based on bottle tests, polymer gel with 28 000 ppm of polymer concentration, and 0.105 ratio of crosslinker to polymer, was selected. The pressure effect within the range of 1000 to 4000 psi indicated not impressive effect of pressure on the gel properties. As the results of creep test clarified, yield strength of the gel was measured at temperature of 90? C, and 2000 Pa. Moreover, the results of an experiment under simulated well condition showed a linear correlation between the height of polymer gel column, and the strength and persist

    Adsorption behavior of petroleum asphaltenes dissolved in Toluene by low-cost mineral adsorbents

    S Veisi, M Vafaie Sefti, S Mohamad Mahdi, E Abdi, S Ahmadi, H Naderi
    Journal Paper , , {Pages }

    Abstract

    Investigation of the size effect of preformed particle gels (polyacrylamide and chromium acetate) on disproportionate permeability reduction

    A Heidari, M Vafaie Sefti, E Vashegani Farahani, M Baghban Salehi, ...
    Journal Paper , , {Pages }

    Abstract

    An Experimental Study of Smart Water and Cedar Leaf Flooding as a Natural Surfactant for Enhanced Oil Recovery from Carbonate Reservoirs

    S Ahmadi, M Vafaie Sefti, MM Shadman, SO Rastegar
    Journal Paper , , {Pages }

    Abstract

    Experimental investigation of dodecylbenzene sulfonic acid and toluene dispersants on asphaltene precipitation of dead and live oil

    E Zahedi, M Vafaie-Sefti, MM Shadman, HASAN Naderi, M Amiri, A Noorbakhsh
    Journal PaperPetroleum Science and Technology , Volume 35 , Issue 7, 2017 April 3, {Pages 653-660 }

    Abstract

    Asphaltene is the heaviest fraction of oil, and if the thermodynamic conditions of oil change, it can be separated from oil precipitate. Of common methods for preventing asphaltene precipitation, using predictive methods, biological methods and injection of dispersants can be mentioned. In this study, the effect of two dispersants of toluene and dodecylbenzene sulfonic acid on asphaltene precipitation of a dead and a live oil sample has been investigated. According to the results, these dispersants in dead oil create an optimum point for asphaltene precipitation. In live oil, these dispersants reduce asphaltene precipitation down to 70%. In addition, it was observed that as an effect of injecting these dispersants, the average sizes of asph

    The optimization of Cu and Fe bioleaching from converter slag using Acidithiobacilus ferrooxidans

    Saeb Ahmadi, Mohsen Vafaie Sefti, Mohammad Mahdi Shadman, Zahra Azimi Dijvejin, Hooshyar Hosseini
    Journal PaperJournal of Advances in Environmental Health Research , Volume 5 , Issue 3, 2017 November 1, {Pages 154-162 }

    Abstract

    The main objective of this work was to assess the optimization of Fe and Cu bioleaching from converter slag using Acidithiobacillus ferrooxidans. Important parameters that contribute to the bioleaching process include initial pH, initial Fe 2+ concentration and pulp density. In order to optimize these parameters, the response surface methodology (RSM) was applied. The maximum simultaneous Fe and Cu recovery yields were 95% and 100%, respectively. The optimum conditions were initial pH 1.8, initial density 1.4 g/100 mL and initial Fe 2+ 7.3 g/L. The comparison between chemical leaching and bioleaching results showed that bioleaching improved the recovery yields of Fe and Cu by 26% and 33%, respectively. The modified shrinking core model was

    Experimental Investigation and Modeling the Effect of CO2 and Rich Gas on the Kinetics of Asphaltene Precipitation from Live Oil

    AR Zanganeh, M Vafaie Sefti, MM Shadman, H Naderi
    Journal Paper , , {Pages }

    Abstract

    Sand Control: Applying Hydrogels as New Method in Oil Reservoirs

    MS ZARGARI, SM VAFAIE, SM BAGHBAN, MA MOUSAVI, KA DADVAND
    Journal Paper , , {Pages }

    Abstract

    Effect of dispersants on the kinetics of asphaltene settling using turbidity measurement method

    MM Shadman, M Vafaie-Sefti, S Ahmadi, MA Assaf, S Veisi
    Journal PaperPetroleum Science and Technology , Volume 34 , Issue 14, 2016 July 17, {Pages 1233-1239 }

    Abstract

    Organic deposition especially asphaltenes in reservoirs, wells, and equipment has a detrimental effect on petroleum economy. Generally, for chemically control of asphaltene precipitation using dispersants and inhibitors of precipitation or solvents of asphaltene is very common. Although asphaltene in crude oil is stable under specific conditions, but there is no assurance that the system will be stable and asphaltenes could be remaining in suspension state. In this study, the kinetic effects of three dispersants on stabilization of asphaltene aggregates were investigated by turbidity measurement method. Turbidity measurement showed as the dispersant strength rises, the turbidity of unstable sample containing dispersant less declines versus

    Experimental and modeling asphaltene precipitation in presence of DBSA using PC-SAFT EOS

    MA Assaf, M Vafaie-Sefti, MM Shadman, A Serajian, S Ahmadi, Z Taherian
    Journal PaperPetroleum Science and Technology , Volume 34 , Issue 17-18, 2016 September 16, {Pages 1534-1541 }

    Abstract

    Asphaltene precipitation and subsequent deposition in production tubing and topside facilities present significant cost penalties to crude oil production. Therefore, it is highly desirable to predict their phase behavior and the efficiency of dispersants in preventing or delaying deposition. Very few studies have been carried out on the molecular interactions between asphaltenes and different dispersants. As a result, the mechanisms by which dispersants stabilize asphaltenes are still open to discussion. The authors introduced a new method to characterize asphaltenes in perturbed chain statistical association fluid theory equation of state (EOS; perturbed-chain statistical association fluid theory EOS [PC-SAFT-EOS]) and correctly model the

    THE USE GLYCERYL TRINITRATE TOPICAL OINTMENT IN THE TREATMENT OF ANAL FISSURE

    Bahar Mahjoubi Mahjoubi, Dariush Davarri, Mohammad Vafaie, Homeira Lalkhoshab, Hamid Shokoohi
    Journal PaperGOVARESH , Volume 4 , Issue 23&24, 2016 December 31, {Pages 148-150 }

    Abstract

    The PDF file you selected should load here if your Web browser has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader)?… Alternatively, you can also download the PDF file directly to your computer, from where it can be opened using a PDF reader. To download the PDF, click the Download link below?… If you would like more information about how to print, save, and work with PDFs, Highwire Press provides a helpful Frequently Asked Questions about PDFs.

    Effect of Dispersant on the Kinetic of Asphaltene Settling using Turbidity Measurement Method

    MM Shadman, M Vafaie Sefti, A Zanganeh
    Journal Paper , , {Pages }

    Abstract

    The Adsorption of Polyacrylamide Nanocomposite Hydrogels on Sandstone

    Samira Rajaee, Mohsen Vafaie Sefti, Asefe Mousavi Moghadam, Mahsa Baghban Salehi, Hasan Naderi
    Journal PaperJournal of Oil, Gas and Petrochemical Technology , Volume 2 , 2015 March 1, {Pages 13-Jan }

    Abstract

    A key parameter for the application of polymer gels in water shut off treatment is the adsorption of polymer gel onto the rock surface. So, the adsorption properties of a nanocomposite hydrogel were discussed in this research by crosslinking of sulfonated polyacrylamide/sodium montmorillonite aqueous solutions with chromium triacetate. The X-ray diffraction patterns indicated that exfoliated type of microstructure was formed. In addition, fourier transform infrared spectroscopy was used to prove the nanocomposite hydrogel interacted with the rock surface qualitatively and the scanning electron microscopy to determine the surface characteristics of the nanocomposite hydrogel layer adsorbed on powdered rock surface. The general behavior of th

    Hydrogel swelling properties: comparison between conventional and nanocomposite hydrogels for water shutoff treatment

    Shabnam Mohammadi, Mohsen Vafaie Sefti, Mahsa Baghban Salehi, Asefe Mousavi Moghadam, Samira Rajaee, Hasan Naderi
    Journal PaperAsia‐Pacific Journal of Chemical Engineering , Volume 10 , Issue 5, 2015 September , {Pages 743-753 }

    Abstract

    One of the unique properties of hydrogels is the dramatically change in their volume and shape. In this research, conventional hydrogels (composed of sulfonated polyacrylamide and Cr (OAc) 3 as copolymer and crosslinker, respectively) were investigated versus nanocomposite (NC) hydrogels for the purpose of achieving suitable composition with ability of high amount of equilibrium swelling ratio and low amount of salt sensitivity factor (f). The results showed that high ratio of Cr (OAc) 3/copolymer (> 0.39) and high concentration of copolymer (> 27 000 ppm) were suitable areas for conventional hydrogels because of minimum f factor with still low ability of gel swelling. However, the results of NC hydrogels with composition of copolymer conce

    Development of a novel water shut‐off test method: Experimental study of polymer gel in porous media with radial flow

    Nasibeh Hajilary, Mohsen Vafaie Sefti, Ali Shahmohammadi, Ahmad Dadvand Koohi, Amin Mohajeri
    Journal PaperThe Canadian Journal of Chemical Engineering , Volume 93 , Issue 11, 2015 November , {Pages 1957-1964 }

    Abstract

    Polymer gel treatment is an economic and effective method to reduce excessive water production in hydrocarbon reservoirs. However, there exist unsuccessful applications of polymer gel due to a mismatch of theoretical and experimental results in field conditions. In this study, a gel treatment experiment was implemented using a novel test method which includes a unique two‐dimensional coreflooding setup and a new procedure of simultaneous oil and water injection. To form the gel in situ, a Cr (III)‐acetate‐hydrolyze polyacrylamide (HPAM) gelant was used. The results showed that polymer gel could be successfully applied to water shut‐off (WSO) treatments in low‐permeable porous media with radial flow. The residual resistance factors

    An Experimental Investigation of Wettability Alteration on Carbonate Rocks by Surfactant

    M Vafaie Sefti, M Jamshidi, K Jarahian, SS Ghorashi, AA Davoodi
    Journal Paper , , {Pages }

    Abstract

    Optimization and Modeling of Contact Angle via Response Surface Methodology in Wettability Alteration Process of Carbonate Rocks by Smart Water

    S Ahmadi, M Vafaie Sefti, A Bahramian, SO Rastegar, K Jarrahian
    Journal Paper , , {Pages }

    Abstract

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