https://dspace.univ-ouargla.dz/jspui/handle/123456789/9955 Thu, 05 Nov 2026 22:31:08 GMT 2026-11-05T22:31:08Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41747 Titre: Caracterization of drilling fluid by adding natural product Auteur(s): HASNAOUI, OUSSAMA Résumé: This study investigates the use of natural additives—namely cellulose nanofibers (CNF), flaxseed gel, and shea gel—as environmentally friendly alternatives to conventional synthetic polymers in water-based drilling fluids (WBDFs). CNF was extracted from wheat straw through alkaline treatment, bleaching, and ultrasonication. Flaxseed and shea gels were prepared using hot water extraction and cold soaking, respectively. The rheological and filtration properties of WBDFs containing these additives at concentrations of 0.1%, 0.3%, and 0.5% were evaluated and compared with polyanionic cellulose (PAC) at 1% and 2%. Results showed that CNF at 0.5% achieved an apparent viscosity of 50–58 cP and reduced API filtrate volume to 4–6 mL, outperforming PAC at 2% (45–50 cP and 5–7 mL). Synergistic combinations of CNF and flaxseed gel exhibited up to 55% improvement in gel strength. Natural additives demonstrated comparable or superior performance to PAC at significantly lower concentrations, offering a sustainable and cost-effective alternative for drilling fluid formulations Description: Université KASDI MERBAH OUARGLA Faculté des Hydrocarbures, des Energies Renouvelables et des Sciences de la Terre et de l’Univers Département : Forage et Mécanique des chantiers pétroliers Mémoire MASTER PROFESSIONNEL Domaine : Sciences et techniques Filière : Hydrocarbures Spécialité : Forage Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41747 2026-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41705 Titre: Analysis and mitigation of wellbore instability in drilling operations, case study: Hassi MESSAOUD field Auteur(s): DJEBLI, Omar; BOUTEGHMES, Fateh; BELHI, Ayoub Résumé: The research investigates the causes of wellbore instability during drilling operations by using a geomechanical-based method focusing on the Hassi Messaoud Field as a case study. This study's primary aims to develop a 1D Mechanical Earth Model (MEM) that can assist to analyse and mitigate of drilling hazards like mud losses, stuck pipe, and non-productive time by integrating drilling reports, well logs, core test data, and laboratory results. Estimated in-situ stresses, pore pressures, rock mechanical properties, and safe mud weight window (MW) will be derived by utilizing a fully integrated database of previously collected data from both drilled offset wells and analysis of those wells in conjunction with either a pilot or a horizontal wellbore to predict wellbore stability and optimize overall drilling performance. The findings of this study demonstrate that advanced geomechanics modelling significantly enhances safe drilling process and wellbore design. Some limitations may arise from rock property assumptions as well as not considering all aspects of full anisotropic properties. overal, this study will prove that geo-mechanics play an important role in enhancing both the safety and effectiveness of drilling activities. Description: Algerian Democratic Republic and Popular Ministry of Higher Education and Scientific Research University of KASDI MERBAH OUARGLA Faculty of Hydrocarbons, Renewable Energies and Earth and Universe Sciences Department of drilling and petroleum field mechanics THESIS MASTER’S DEGREE Domain: Sciences and Technologies Field: Hydrocarbons Speciality: Professional drilling Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41705 2026-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41693 Titre: Eulerian Multiphase Numerical Simulation of a Granular Flow Auteur(s): BOUFENGHOUR, Baha Eddine; BOUZIANE, Mohamed Abd Rehman; DISS, Khireddine Résumé: This study investigates the solid-liquid mixing dynamics within a mechanically stirred tank using numerical simulation. The analysis focuses on the behavior of a turbulent flow generated by impellers, combining both axial and axial-radial flow patterns to interact with the fluid. By tracking particle movement from an initial state of gravitational sedimentation to a fully developed suspension, the results demonstrate how the mechanical energy induced by the rotating blades effectively overcomes gravity. This generalized approach evaluates mixing efficiency and ensures continuous phase homogeneity in industrial applications Description: University of Kasid Merbah Ouargla Faculty of Hydrocarbons, Renewable Energies, Earth, and Universe Sciences Department of Hydrocarbon Drilling Oil Mechanics THESIS To obtain the master’s degree Option: Drilling Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41693 2026-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41595 Titre: Développement d’in Système d’indentifications des mécanismes de coincement SIMC cas de puit MLSW04 Auteur(s): SIAD ahmed, yacine; SALMA, abderaouf; BELKASMI, atef Résumé: Le coincement de garniture de forage pose un défi important dans l'industrie pétrolière et gazière, entraînant des perturbations, des retards et des implications financières. Les causes coincement varient, notamment le coincement différentiel, l'instabilité du puits, les problèmes de géométrie, les obstructions et les défaillances d'équipement. La résolution de ces incidents nécessite une expertise technique, une évaluation minutieuse et la mise en oeuvre de techniques appropriées telles que la gestion des pressions de puits, l'intervention mécanique, les solvants chimiques et les opérations de pêche. La prévention joue un rôle crucial dans la réduction des incidents de tige coincé grâce à des bonnes pratiques telles que la gestion des fluides de forage, la surveillance en temps réel, le renforcement du puits, le nettoyage et une formation complète. Les sociétés de forage doivent disposer de plans de contingence, d'équipements spécialisés et d'une expertise pour gérer efficacement de telles situations, la détection précoce, la réponse rapide et les mesures proactives étant essentielles pour des opérations de forage fluides et efficaces Description: REPUBLIQUE ALGERIENNE DEMOCRATIQUE ET POPULAIRE Ministère de l'Enseignement Supérieur et de la Recherche Scientifique Université Kasdi Merbah Ouargla Faculté des hydrocarbures et d’énergies renouvelables et science de la terre et de l’univers Département de Forage et Mécanique des chantiers pétroliers MÉMOIRE FIN D`ETUDE Pour obtenir le Diplôme de Master Option : FORAGE Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41595 2026-01-01T00:00:00Z