Browsing by Author "Gareche, Mourad"

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    Colloidal behavior of aqueous montmorillonite suspensions in the presence of non-ionic polymer
    (2015) Gareche, Mourad; Azri, N.; Allal, A.; Zeraibi, Noureddine
    In this paper we characterized at first, the rheological behavior of the bentonite suspensions and the aqueous solutions of polyethylene oxide (PEO), then we were investigated the influence of this polymer in a water-based drilling fluid model (6% of bentonite suspension). The objective is to exhibit how the non ionic polymer with molecular weight 6×103 g/mol. of varying concentration mass (0.7%, 1%, 2% et 3%) significantly alter the rheological properties (yield stress, viscosity, loss and elastic modulus) of the bentonite suspensions. The rheological measurements made in simple shear and in dynamic on the mixture (water-bentonite-PEO), showed rheological properties of bentonite suspensions both in the presence and absence of non-ionic polymer. The PEO presents an affinity for the bentonite particles slowing down their kinetic aggregation. The analysis by X-rays diffraction also allowed understanding the structure of this mixture. It had revealed the intercalation between of the clay platelets on one hand, and the links bridges assured by the chains of polymer between bentonite particles beyond a critical concentration in PEO on the other hand. The Herschel- Bulkley rheological model is used for the correlation of our experimental results
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    Cours et Exercices de Filtration des Fluides Pétroliers
    (Université M’Hamed Bougara – Boumerdes / Faculté des Hydrocarbures et de la Chimie : Département Gisement Minier et Pétrolier, 2018) Gareche, Mourad
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    Cours et exiercices d 'hydrodynamique appliquée
    (Université M'hamed Bougara de Boumerdès / Faculté des hydrocarbures et de la chimie, 2021) Gareche, Mourad
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    Etude comparative de modèles rhéologiques. Application au Carbopol 940
    (2007) Amoura, M.; Zeraibi, Noureddine; Gareche, Mourad
    La détermination des grandeurs rhéologiques d’un fluide non-Newtonien est fondamentale pour la réussite des études sur les écoulements de ce type de fluide. Dans ce travail, un modèle permettant de représenter correctement le comportement visqueux d’un matériau modèle non-Newtonien a été déterminé en faisant une étude comparative des différentes lois rhéologiques (Casson, Casson généralisé, Herschel-Bulkley)
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    Etude de la convection forcée d’un fluide non-Newtonien dans un espace annulaire tournant
    (2007) Amoura, M.; Zeraibi, Noureddine; Gareche, Mourad
    Nous proposons une étude numérique de la convection thermique des fluides non-newtoniens dans les espaces annulaires cylindriques tournants. Le modèle rhéologique retenu dans cette étude est le modèle de Carreau. Les équations de conservation sont résolues par une méthode d’éléments finis mixtes. On étudie l’influence du nombre de Reynolds et de l’indice de l’écoulement, sur le transfert de chaleur et sur la structure de l’écoulement. Les résultats obtenus en convection forcée sont discutés
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    Expérience d’exfoliation d’une bentonite par un polyéthylène oxyde en solution aqueuse
    (2009) Gareche, Mourad; Allal, A.; Zeraibi, Noureddine
    Cette étude porte sur le comportement rhéologique des boues de forage. Les formulations de ces fluides donnent des suspensions colloïdales complexes. Ces suspensions possèdent de nombreux composants interagissant entre eux. L’influence des interactions rend difficile la description des propriétés rhéologiques. Dans ce travail, nous avons étudié des suspensions simples de trois composants l’eau, la bentonite et un polymère. En théorie, les nanoparticules de bentonite devraient augmenter toutes propriétés physiques (viscosité, module) des mélanges. Malheureusement, la dispersion de ces plaquettes est problématique. Notre objectif, ici, est de déterminer les conditions physiques d’une exfoliation de la bentonite par un polymère (le Polyéthylène oxyde)
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    Finite element study of mixed convection for non-Newtonian fluid between two coaxial rotating cylinders
    (2006) Amoura, Mourad; Zeraibi, Noureddine; Smati, A.; Gareche, Mourad
    In this work, we present a numerical simulation of the flow characteristics and the heat transfer mechanism of a non-Newtonian fluid in an annular space between two coaxial rotating cylinders. The Carreau stress–strain relation was adopted to model the rheological fluid behaviour. The problem is studied when the heated inner cylinder rotates around the common axis with constant angular velocity and the cooled outer cylinder is at the rest. The horizontal endplates are assumed adiabatic. The governing equations are solved using mixed finite elements method. The effects of the different parameters on the heat transfer and on the flow are examined. These parameters are the Reynolds (Re), the Grashof (Gr) and the Weissenberg numbers (We), and the flow index (n). The results of the natural, forced and mixed convections are presented and discussed. © 2006 Elsevier Ltd. All rights reserved
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    Formulation et caractérisation rhéologique des suspensions de bentonite en présence d’additifs polymériques
    (2013) Gareche, Mourad
    Le but de cette thèse est d'étudier le comportement rhéologique des suspensions de bentonite seules et en présence de polymère non ionique, le polyéthylène oxyde (PEO). Pour atteindre cet objectif, nous avons couple aux mesures rhéologiques quelques analyse (MEB, DRX...etc) afin de mieux interpréter et comprendre le lien entre les propriétés physiques macroscopiques et la microstructure des matériaux thixotropes en écoulement, a l'arrêt ou lors de leur transition liquide/solide. Dans un premier temps, nous nous sommes intéressés a la viscoélasticité linéaire avec pour objectif de faire le lien entre la structure fractale de ces suspensions et la variation de leurs modules complexes de cisaillement G*(ω). La modélisation du comportement rhéologique aux petites déformations a montre que connaissant la dimension fractale d'une suspension de bentonite, il était possible de déterminer son comportement rhéologique en terme de variation du module complexe en fonction de la fréquence. Dans un second temps, nous avons aborde une problématique apparentée au forage de puits pétroliers et en relation avec les propriétés thixotropes de tels fluides. Elle correspond au problème de redémarrage du fluide de forage après un temps de repos. Pour répondre a cette question, nous avons étudié le régime solide de ce matériau industriel en essayant d'utiliser des techniques proches de celles utilisées sur chantier. Nos mesures ont révélé que les effets thixotropes de ce matériau dans le domaine solide sont couramment sous estimes. Pour pallier a ce manque, nous avons utilise un modèle permettant d'estimer plus justement l'influence de la thixotropie du fluide sur le redémarrage de la boue après un temps de repos. Enfin, nous avons montre que le PEO mis dans la suspension présente une affinité pour les particules de bentonite et affecte ses propriétés rhéologiques en réduisant la contrainte seuil d'écoulement, les modules viscoélastiques de conservation et de perte. En effet, cet additif peut adopter plusieurs mécanismes suivant sa nature son poids moléculaire et sa concentration : s'adsorber sur les particules de bentonite, diffuser dans l'espace interfoliaire et ponter les particules d’argile engendrant une floculation systématique
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    Modeling wax disappearance temperature using robust white-box machine learning
    (Elsevier Ltd, 2024) Nait Amar, Menad; Zeraibi, Noureddine; Benamara, Chahrazed; Djema, Hakim; Saifi, Redha; Gareche, Mourad
    Wax deposition is one of the major operational problems encountered in the upstream petroleum production system. The deposition of this undesirable scale can cause a variety of challenging problems. In order to avoid the latter, numerous parameters associated with the mechanism of wax deposition should be determined precisely. In this study, a new smart correlation was proposed for the accurate prediction of Wax disappearance temperature (WDT) using a robust explicit-based machine learning (ML) approach, namely gene expression programming (GEP). The correlation was developed using comprehensive experimental measurements. The obtained results revealed the promising degree of accuracy of the suggested GEP-based correlations. In this context, the newly-introduced correlations provided excellent statistical metrics (R2 = 0.9647 and AARD = 0.5963 %). Furthermore, performance of the developed correlation outperformed that of many existing approaches for predicting WDT. In addition, the trend analysis performed on the outcomes of the proposed GEP-based correlations divulged their physical validity and consistency. Lastly, the findings of this study provide a promising benefit, as the newly developed correlations can notably improve the adequate estimation of WDT, thus facilitating the simulation of wax deposition-related phenomena. In this context, the proposed correlations can supply the effective management of the production facilities and improvement of project economics since the provided correlation is a simple-to-use decision-making tool for production and chemical engineers engaged in the management of organic deposit-related issues.
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    Modélisation du module complexe de cisaillement des suspensions de bentonite = Modelling of complex shear modulus of bentonite suspensions
    (Groupe français de rhéologie, Sophia Antipolis, FRANCE, 2009) Allal, A.; Gareche, Mourad; Dupin, J. C.; Roby, F.; Zeraibi, Noureddine
    Dans ce travail, nous avons étudié le comportement rhéologique de suspensions de bentonite pour diverses concentrations massiques (2, 4, 5, 6 et 8 %). Nous nous sommes intéressés plus particulièrement à la viscoélasticité linéaire, avec pour objectif de faire le lien entre la structure fractale des ces suspensions et le module de cisaillement complexe. A partir de la dimension fractale des gels formés par les particules d'argile en interaction dans les suspensions de bentonite, nous avons modélisé la variation de leurs modules complexes de cisaillement en fonction de la fréquence
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    Numerical study of a thermodependent non-Newtonian fluid flow between vertical concentric cylinders
    (Elsevier, 2007) Zeraibi, Noureddine; Amoura, M.; Benzaou, A.; Gareche, Mourad
    In this paper, we present a numerical investigation of the thermal convection for a thermodependent non-Newtonian fluid in an annular space between two coaxial rotating cylinders. The rheological behaviour of the fluid can be expressed through the Ostwald-De-Waele power law: View the MathML sourceτ=Kγ˙n; all fluid properties except consistency index K are constant. K–T relation used is K = K0e−bT. The problem is studied when the heated inner cylinder is rotating around the common axis with constant angular velocity and the cooled outer cylinder is at the rest. The horizontal endplates are assumed adiabatic. The governing equations are solved using mixed finite elements method. The influence of the temperature on the structure of the dynamic and thermal fields is examined
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    Relationship between the fractal structure with the shear complex modulus of montmorillonite suspensions
    (Elsevier, 2016) Gareche, Mourad; Allal, A.; Zeraibi, Noureddine; Roby, F.; Azril, N.; Saoudi, L.
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    Review of recent advances in polyethylenimine crosslinked polymer gels used for conformance control applications
    (Springer, 2019) Ghriga, Mohammed Abdelfetah; Grassl, Bruno; Gareche, Mourad; Khodja, Mohamed; Lebouachera, Seif El Islam; Andreu, Nathalie; Drouiche, Nadjib
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    Rheological and flow behavior of water-in-oil Pickering emulsions stabilized with organo-hectorite clay
    (Elsevier, 2021) Boutheina, Merad; Bekkour, Karim; Pierre, François; Gareche, Mourad
    The rheological and flow behaviors of Pickering emulsions are studied as a function of their water concentration. The studied emulsions are water-in-gasoil inverse emulsions stabilized with organo-hectorite clay. An in-line emulsion preparation was performed and a novel emulsification system was used. The emulsification system was tested and confirmed before performing pipe-flow measurements. A stress-controlled rheometer was used to study the rheological behavior of organoclay stabilized inverse emulsions. It was found that the emulsions exhibited a shear thinning with yield stress non-Newtonian rheological behavior and that the flow curves were well correlated using the Herschel-Bulkley model. Pressure loss and axial velocity measurements were studied to investigate the pipe-flow behavior of the emulsions. Axial velocity of the fluids was measured using an Ultrasonic Pulsed Doppler Velocimeter. It was shown that, up to 50 wt% water mass concentration, an exponential increase of yield stress and viscosity values is noticed, and the phase inversion point is not reached. In the range of the applied flow rates, turbulence took place only in the case of the lowest water cut (0 wt%). The Herschel-Bulkley rheological parameters were used to simulate the pipe-flow behavior of the studied fluids, and showed a satisfactory correlation with the in-line measurements. Furthermore, wall shear stress and velocity profiles were used to study the short-, medium-, and long-term stability of the emulsions
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    Rheological studies and optimization of Herschel–Bulkley parameters of an environmentally friendly drilling fluid using genetic algorithm
    (Springer, 2018) Ouaer, Hocine; Gareche, Mourad; Rooki, Reza
    The Herschel–Bulkley rheological parameters of an environmentally friendly drilling fluid formulated based on an Algerianbentonite and two polymers—hydroxyethyl cellulose and polyethylene glycol—have been optimized using a genetic algorithm.The effect of hydroxyethyl cellulose, temperature, pH and sodium chloride (NaCl) on the three-parameter Herschel-Bulkleymodel was also studied. The genetic algorithm technique provided improved rheological parameter characterization compared tothe nonlinear regression, especially in the case of drilling fluids formulated with sodium chloride making it a better choice.Furthermore, the oscillatory test offered more reliable yield stress values. The rheological parameters were found to be verysensitive to different conditions. Yield stress and consistency index increased with increasing the hydroxyethyl cellulose con-centration, reaching maximum at a temperature of 65 °C and decreased with decreasing pH and also when adding sodiumchloride to the drilling fluid. The flow index changed inversely to yield stress and consistency index. The physical origins of thesechanges in rheological parameters were discussed and correlation between variation in rheological parameters and bentonitesuspension properties were concluded. Based on these results, it is recommended to use the proposed formulation of drilling fluidat high temperature and when the formation of alkaline pH is encountered due to the gelation mechanism and to select theoptimum concentration of NaCl to avoid degradation of the rheological parameters
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    Rheological study of concentrated dispersions. Application to the drilling fluid
    (Institute of Physics Publishing, 2018) Ouaer, Hocine; Gareche, Mourad; Allal, Ahmed
    In order to understand the rheological behavior of concentrated aqueous Algerian bentonite dispersions of drilling (sodium bentonite of Mostaganem "m'zila"), rheological tests were carried out. By varying the concentration of bentonite, flow tests have allowed to estimate the yield stress and apparent viscosity for each concentration and to see their influence on the rheological behavior of these dispersions. In addition dynamic tests (oscillatory) are used to define the linear region of our samples, the state of our fluid (elastic solid or viscous liquid) and understanding the mechanisms of structuring of the particles constituting the material. In parallel, other tests coupled with rheological measurements such as x-rays diffraction to know the mineralogical composition and granulometry to estimate the bentonite particle size.
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    Thermal gelation of partially hydrolysed polyacrylamide/polyethylenimine mixtures using design of experiments approach
    (Elsevier, 2019) Ghriga, Mohammed Abdelfetah; Hasanzadeh, Mahdi; Gareche, Mourad; Lebouachera, Seif El Islam; Drouiche, Nadjib; Grassl, Bruno
    Polyethylenimine crosslinked polymer gels are gaining a huge interest in conformance control applications in oilfields. They are used to reduce the production of undesirable fluids (water & gas) by blocking the fractures that connect injection and production wells. In this paper, a statistical analysis on the thermal gelation of well characterized reactants namely partially hydrolysed polyacrylamide (PHPA) (Mw = 5.1 million Daltons and hydrolysis degree = 6%) and polyethylenimine (PEI) (Mw = 19.2 kilo Daltons and branching degree = 59%), was conducted using response surface methodology (RSM). A four factor doehlert matrix was employed in designing the experiments and evaluating the gelation time as function of salinity (0–8 g/L NaCl), polymer (PHPA) and crosslinker (PEI) concentrations, temperature (70 °C–90 °C) and their corresponding combinations. As a result, the gelation time was found to strongly vary with salinity, temperature and PHPA concentration following a nonlinear mathematical model. The analysis of variance (ANOVA) of this model revealed its significance in a 95% confidence level against experimental data. In a second part, an experimental investigation was carried out to understand the interaction between PHPA and PEI. To do so, the viscosity variations of analogue mixtures prepared with low molecular weight (Mw) polymers, such as polyacrylamide (PAM) and polyacrylic acid (PAA), were monitored using capillary viscometry at different conditions of temperature, pH and reaction time. The PAM/PEI mixtures showed a remarkable viscosity increase at typical pH of around 10 when cured at 80 °C. While, the PAA/PEI mixtures underwent precipitation at pH of around 6 revealing the strong interaction between PAA and PEI at this condition