https://dspace.univ-ouargla.dz/jspui/handle/123456789/9955 Thu, 15 Oct 2026 16:07:10 GMT 2026-10-15T16:07:10Z 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 https://dspace.univ-ouargla.dz/jspui/handle/123456789/41590 Titre: Effectiveness of natural inhibitors against oil pipeline corrosion under corrosive conditions in the Berkaoui Region Auteur(s): Benhamed, Sadjida Wissam; Zegaoula, Abderrahmane Résumé: Microbiologically Influenced Corrosion (MIC) represents a major challenge to the integrity of oilfield infrastructure, particularly in the Haoud Berkaoui oil field, where chemical factors such as carbon monoxide (CO) and hydrogen sulfide (H₂S), together with corrosive bacterial species such as Sulfate-Reducing Bacteria (SRB), accelerate equipment degradation. This study investigates the corrosion inhibition properties of oregano, rosemary, and neem extracts as natural and environmentally friendly alternatives to conventional chemical inhibitors. The extracts, rich in bioactive compounds such as thymol, carvacrol, and flavonoids, were tested at different concentrations on X52 steel specimens under simulated oilfield conditions. Weight-loss measurements and microscopic analysis revealed that the addition of oregano, rosemary, and neem extracts significantly reduced the corrosion rate and shifted corrosion potentials toward more negative values, indicating a cathodic inhibition behavior. These extracts formed a protective barrier against corrosive species and inhibited the activity of sulfate-reducing bacteria (SRB). The results indicate that oregano, rosemary, and neem extracts provide effective corrosion protection while contributing to sustainable and environmentally responsible corrosion management practices in the hydrocarbon sector. Further optimization and field testing are recommended to validate their industrial applicability and long-term performance Description: People’s Democratic Republic of Algeria Ministry of Higher Education and Scientific Research University KASDI MERBAH OUARGLA Faculty of Hydrocarbons, Renewable Energies, Sciences, and Universe Sciences Earth Department of Drilling and Oilfield Mechanics Thesis Submitted in partial fulfillment of the requirements for the degree of MASTER Domain: Science and Technology Field: Hydrocarbons Specialty: Oilfield mechanics Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41590 2026-01-01T00:00:00Z