Publications Scientifiques

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Author: search.filters.author.Benyounes, KhaledHas files: Yes

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    Effect of concentration and temperature on the rheological behavior of hydroxylethyl cellulose solutions
    (2022) Remli, Samia; Benyounes, Khaled; Benmounah, Abdelbaki
    The knowledge of the rheological properties of polymers makes their use interesting in various fields of applications, such as food industry, cosmetics, enhanced oil recovery or construction materials. Whatever the application, the effect of temperature and concentration on these properties is of great importance. This study covered a wide range of concentrations from 0.2 w/% to 1 w/%, and temperatures from 10 °C to 80 °C. The results obtained provide interesting information regarding the effects of the temperature and concentration of the aqueous solutions of the polymer since they reveal that the rheological properties remained practically unchanged in the temperature range considered. The impacts of shear rate, temperature and concentration on the flow behavior were analyzed. Small-amplitude oscillatory shear measurements were performed, and the results obtained show that the apparent viscosity is strongly influenced by the concentration of the aqueous solution of HEC, exhibiting a marked non-Newtonian shear-thinning behavior at different temperatures. The flow behavior is well described by several rheological models. The effect of temperature on the kinematic viscosity was fitted with the Arrhenius model; the behavior of this model in relation to experimental viscosity values was suitable and the linear fit showed good regression coefficients. The dynamic state was well described with the generalized Maxwell model
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    Inhibition of asphaltene flocculation in light crude oil: effect of pressure, temperature and inhibitor concentration
    (Taylor and Francis Online, 2018) Gharbi, Kheira; Benyounes, Khaled; Benamara, Chahrazed
    In this study, a light crude oil sample was taken from Hassi Messaoud field to characterize its physicochemical properties. The asphaltene flocculation onset was determined in the dead oil by Flocculation Titrimeter equipment. The petroleum resins have been extracted from the same crude oil and tested as an inhibitor of asphaltene flocculation then their efficiency has been studied at different conditions of pressure and temperature. The results point out that the extracted resins may have two different effects on the onset point depending upon the operator conditions and the concentration of the added resins to crude oil.
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    Rheological behavior of cement-based grout with Algerian bentonite
    (Springer Nature, 2019) Benyounes, Khaled
    he rheological parameters, yield stress, flow index, consistency, and plastic viscosity of cement grouts are important parameters for the quality control of these materials. These parameters are assessed from the rheogram using a rheo-logical model. Cement slurries without additive indicated a non-Newtonian type of rheological behaviour with yield stress. On the other hand, the mixtures containing a viscosifying agent exhibit a shear-thinning rheological behaviour which is much more important than the mixtures without a viscosifying agent. In this work, we formulated non-hydrated Algerian bentonite cement slurry in the presence of a superplasticizer. Cement was replaced cement by bentonite in five different substitution rates (2%, 4%, 6%, 8%, and 10%) and the water/binder ratio was fixed at 0.5. For this, various rheological tests were realized by using a controlled stress rheometer. In order to show the influence of bentonite on the rheological behaviour of the different grouts, several flow tests were carried out for a range of shear rates between 0.01 and 200 s−1. To properly adjust the different rheograms, various rheological models were used such as the models of Bingham, Herschel–Bulkley, modified Bingham, Casson, De Kee, Vom Berg, Yahia and Papanastasiou. For the correct choice of the rheological model, it was based on the calculation of the standard error. It was found that the rheological models of Herschel–Bulkley and Papanastasiou made it possible to better describe the flow curves compared to the other rheological models. It has been found that as the content of bentonite increases, the yield stress and the consistency evolve drastically, by cons the flow index decreases progressively
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    Effect of anionic polyelectrolytes on the flow of activated sodium bentonite drilling mud
    (EDP Sciences, 2018) Chalah, Kaci; Benmounah, Abdelbaki; Benyounes, Khaled
    Bentonite is often used in water-based drilling fluids. The xanthan gum is widely used as to increase the viscosity of the bentonite suspension. For the stabilization of the drilled layers, we use filtrate reducers: sodium carboxymethylcellulose low viscosity and cellulose polyanionic low viscosity. The objective of this work is to explain the effect of the polymers on the rheological behavior of the 5% bentonite suspensions. These results will provide practical recommendations for the rational use of different types of additives in water-based drilling muds. Our work is based on rheological trials on a viscometer. The results obtained on the bentonite 5%-xanthane suspension show a rheofluidifying behavior with yield stress conform to the Herschel-bulckly modal. While increasing the concentration of filtrate reducer decreases the yield stress and reduces the viscosity. The effect of CMC LV is more pronounced than PAC L
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    Influence of the shrinkage and the slenderness of fibers on the properties of the mortars destined for the concretes fiber
    (Mouloud Mammeri University of Tizi-Ouzou, 2015) Benyounes, Khaled; Aribi, Chouaib; Meziani, Ramzi; Benmounah, Abdelbaki
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    Simulation study of hydraulic fracturing in carbonate oil reservoir by using kgd model
    (2017) Benyounes, Khaled; Saifi, R.; Kerrouche, M.; Mellak, A.
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    Removal and prevention of asphaltene deposition during oil production : a literature review
    (Elsevier, 2017) Gharbi, Kheira; Benyounes, Khaled; Khodja, Mohamed
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    Characterization and modeling of rheological behavior of a mud system for reverse emulsion
    (2016) Mellak, Abderrahmane; Benyounes, Khaled; Kherfellah, N.; EL Heit, K.
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    Drop pressure optimisation in oil well drilling
    (2014) Mellak, Abderrahmane; Benyounes, Khaled; Djeridi, A.