Browsing by Author "Benyounes, Khaled"

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    Caractérisation rhéologique de la bentonite de maghnia en suspension aqueuse sans et avec additifs anioniques
    (2010) Benyounes, Khaled; Benchabane, A.; Mellak, A.
    L'objectif de ce travail est l’étude de l'effet de l’ajout de deux polymères anioniques sur les caractéristiques rhéologiques d'une suspension aqueuse de bentonite algérienne de forage (de Maghnia, Ouest de l’Algérie). Les additifs sont la gomme de xanthane et le carboxymethylcellulose, CMC, utilisés souvent dans la formulation des boues de forage. Dans cet article, nous présentons et discutons des mesures rhéologiques réalisés sur : 1) une suspension aqueuse de bentonite (3%), 2) des polymères en solution aqueuse (le xanthane et le CMC à trois poids moléculaires différentes) et 3) des mélanges eau-bentonite-(xanthane ou CMC) à différentes concentrations de polymère. Ce travail a permis, notamment, de renforcer la conclusion rapportée dans des travaux conduits antérieurement sur la base d’une bentonite de laboratoire, montrant la dominance du comportement rhéologique du CMC et de xanthane sur celui de la suspension de bentonite
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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.
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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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    The effect of carboxymethylcellulose and xanthan on the rheology of bentonite suspensions
    (Taylor & Francis, 2010) Benyounes, Khaled; Mellak, A.; Benchabane, A.
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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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    Effect of polymer concentration on the rheological properties of polyelectrolyte solutions
    (International Multidisciplinary Scientific Geoconference, 2014) Benyounes, Khaled; Mellak, A.; Benmounah, A.; Oubraham, C.
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    Etude de l’influence d’additifs sur le comportement rhéologique des suspensions de bentonite de maghnia : application aux fluides de forage
    (2010) Benyounes, Khaled
    Le but de cette thèse est d’étudier le comportement rhéologique des suspensions d’argile en présence ou en absence d’additifs. L’argile utilisée est une bentonite de forage de Maghnia (Algérie), c’est le constituant principal de la boue de forage à base d’eau. Les additifs utilisés dans notre travail de recherche sont : le xanthane, le carboxyméthylcellulose (CMC) à différentes masses molaires et le chlorure de potassium. L’essai rhéologique en régime permanent a montré que les suspensions de bentonite présentent une contrainte seuil. L’augmentation de la concentration en bentonite a conduit à l’augmentation de la viscosité et de la contrainte seuil. Une caractérisation rhéologique en mode dynamique a révélé que les suspensions de bentonite sont des fluides viscoélastiques à dominance élastique. Les rhéogrammes des solutions de xanthane ont décelé la présence de contrainte seuil tandis que les solutions de CMC à différentes masses molaires n’ont pas présenté de contrainte seuil. Par le biais des essais rhéologiques en régime permanent et transitoire du système bentonite-polymère, nous avons mis l’accent sur le type d’interaction mis en jeu entre les particules argileuses et les chaines polymériques. Ces essais ont montré que le comportement rhéologique des mélanges a été dominé principalement par la nature du polymère. Des mesures à la diffraction des rayons X et zétamétriques ont été effectuées et nous ont permis la bonne compréhension du comportement rhéologique de la bentonite hydratée dans une solution de chlorure de potassium
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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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    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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    Modeling and rheological characterization of sludge based drilling oil
    (2014) Mellak, Abderrahmane; Benyounes, Khaled
    When the drilling mud is in contact with more or less permeable walls of the well, the liquid filter part in the formation by depositing on the walls of the solid part is called the cake (silty clay film). Among the main functions of drilling fluid include keeping the walls of the well due to the hydrostatic pressure exerted by the flowing fluid. Also, the mastery of the rheological properties of the mud used is required. . The rheological characterization focus on the drilling mud used for drilling the 121/4 phase in the well AY (Hassi Messaoud) is an invert emulsion mud with oil report / water 85/15 and its density is 2.04, consisting essentially of gas oil, organophilic clay, two emulsions, sodium chloride and barite. It would define the rheological model of drilling fluid used and seek the most suitable rheological model. The rheological tests were carried out using a Fann viscometer 6-speed (3, 6, 100, 200,300 and 600 rpm) to determine the rheological properties of the mud as the yield value or yield stress, the plastic viscosity and apparent viscosity. Other rheological parameters such as the consistency index (k) and the behavior index (n) of the mud were estimated. The results show that the Herschel-Bulkley model is a minimal deviation from other models (model Bingham and Ostwald de Waele or Power)
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    Physicochemical Profile of Essential Oil of Daucus carota
    (International Science Index, 2015) Behidj-Benyounes, N.; Benyounes, Khaled; Dahmene, T.; Chebouti, N.; Kebbouche-Gana, Salima
    Essential oils have a significant antimicrobial activity. These oils can successfully replace the antibiotics. So, the microorganisms show their inefficiencies resistant for the antibiotics. For this reason, we study the physicochemical analysis and antimicrobial activity of the essential oil of Daucus carota. The extraction is done by steam distillation of water which brought us a very significant return of 4.65%. The analysis of the essential oil is performed by GC / MS and has allowed us to identify 32 compounds in the oil of D. carota flowering tops of Bouira. Three of which are in the majority are the α-Pinene (22.3%), the carotol (21.7%) and the limonene (15.8%)
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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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    Rheological and electrokinetic properties of carboxymethylcellulose-water dispersions in the presence of salts
    (2012) Benyounes, Khaled; Benmounah, A.
    The purpose of this work is to investigate the effect of the addition of salts in the form of calcium chloride, sodium chloride and potassium chloride on the rheological and electrokinetic properties of diluted sodium carboxymethylcellulose (Na-CMC) dispersions (0.50%). The rheological data of a water-CMC-salt system were obtained using coaxial cylinder viscometer covering a wide range of shear rate (0 to 600 s-1). Ostwald–de Waele power law was used for fitting flow curves of various samples. The presence of salts in CMC aqueous solutions leads to the reduction of the consistency index and the increase of flow index as salinity increases. When the concentration of salts is greater than 3%, the rheological parameters of CMC solutions in saline medium are quasi stable. The electrokinetic measurements show an increase of the zeta potential of CMC dispersions when the concentration of salts in solution increases. Calcium chloride caused the greatest increase in zeta potential. Excluding the monovalent cations, the divalent cation is able to reverse the sign of the zeta potential from negative to positive
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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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    Simulation study of hydraulic fracturing in carbonate oil reservoir by using kgd model
    (2017) Benyounes, Khaled; Saifi, R.; Kerrouche, M.; Mellak, A.