PhD theses (TN-lEP)
Recent Submissions
-
Identification of Nonlinear Conservation Laws Using Symbolic Neural Networks
(PhD Theses;731, Doctoral thesis, 2023)Nonlinear dynamical systems are omnipresent in nature, commonly seen in many disciplines such as physics, biology, chemistry, climate science, and engineering. In this thesis, we introduce several new ideas by integrating ... -
Drilling Fluid Additives for Wellbore Strengthening and Reservoir Protection
(PhD Theses;726, Doctoral thesis, 2023)The objective of the research was to optimise drilling fluid additives for wellbore strengthening, preventing lost circulation and avoiding drilling fluid induced formation damage. Industry standard testing, such as HTHP ... -
Synthesis and Development of One-part Rock-based Geopolymers for Well Cementing Applications
(PhD Theses UiS;717, Doctoral thesis, 2023)A one-part or Just Add Water (JAW) geopolymer system is an environmental- and user-friendly alternative to Ordinary Portland Cement (OPC) and conventional geopolymers. It helps with producing lower CO2 emissions avoiding ... -
Transition-metal-mediated electrocatalytic CO2 reduction: from nanoparticles to single-atom catalysts
(PhD Theses;709, Doctoral thesis, 2023)With the rapid development of the global economy, energy crisis and environment issues have become increasingly prominent. Carbon dioxide (CO2) is a primary greenhouse gas (CHG), while it could also be a valuable carbon ... -
Techno-economic assessment of decarbonisation technologies for the iron and steel industry
(PhD Theses;704, Doctoral thesis, 2023)Rapid decarbonisation of all segments of the economy is essential to limit the global mean surface temperature rise to 1.5ºC. Industries contribute to approximately a quarter of the global energy related emissions but have ... -
Instituting Retarders for Geopolymers Developed for Downhole Applications
(PhD Theses;699, Doctoral thesis, 2023)Geopolymers are a cementitious material that has been under study for many years. The material is noticed as a potential full replacement for traditional cementitious material both in construction and petroleum industry. ... -
Solvent-Free Electrode Fabrication Based on Polytetrafluoroethylene Fibrillation for Lithium-ion Batteries
(PhD Theses;883, Doctoral thesis, 2023)The commercial lithium-ion batteries (LiBs) electrodes are manufactured with slurry casting (SC) procedure, where a large amount of energy is consumed, increasing the manufacturing cost a lot. In addition, the SC procedure ... -
Characterization of annulus well cement quality to estimate the leakage potential in cement well barriers
(PhD Theses;676, Doctoral thesis, 2022-11)Cement is nowadays the most used material that is placed inside of wells as a barrier element to ensure zonal isolation and avoid migration of fluids between the reservoir and surface. Sometimes the well integrity can be ... -
Prediction, interpolation and extrapolation of drilling data with Deep Learning
(Doctoral thesis, 2022-11)Directional drilling is an established technology within the petroleum industry. In this traditionally conservative and risk averse environment application of artificial intelligence encounters difficulties at various ... -
Materials for Well Integrity: Performance of Setting Materials for Well Cementing Operation
(PhD thesis UiS;642, Doctoral thesis, 2022-05)Primary cementing operation is the process of pumping and placing a cementitious slurry in a well. After setting, the so-called barrier material has to provide zonal isolation in the annular gap behind casing string. After ... -
Mathematical modeling of compressible and incompressible multiphase flow based on mixture theory
(PhD thesis UiS;501, Doctoral thesis, 2020-11)MIXTURE THEORY has been developed based on balance laws and conservation principles which is well known in continuum mechanics, and has been widely applied to systems which can be characterized as a mixture of interacting ... -
CO2 methanation on Ni-Fe based catalysts: Mechanistic and structured reactor study
(PhD thesis UiS;607, Doctoral thesis, 2021-10)The clean energy transition towards renewable energy sources has increased the need for large-scale and long-term energy storage systems. Power-to-Gas concept offers the solution to convert surplus electrical power into ... -
Improved Dynamic Modelling of Two-Phase Flow in Well Control Operations
(PhD thesis UiS;577, Doctoral thesis, 2021-03)This thesis focuses on exploring applications and optimizing transient numerical models for simulating well control situations. The main scope of the research was to find opportunity for improving existing numerical models ... -
Safety and reliability improvements of valves and actuators for the offshore oil and gas industry through optimized design
(PhD thesis UiS;573, Doctoral thesis, 2021-02)Valves are essential components of piping systems in the oil and gas industry, especially offshore, where they are used for stopping or starting the fluid, flow regulation, and back flow prevention, as well as safety ... -
Catalytic conversion of CO2 to methanol via CO2 hydrogenation : An investigation of metal oxide promoted catalysts
(PhD thesis UiS;574, Doctoral thesis, 2021-02)CO2 hydrogenation to methanol is a promising process for converting renewable energy into valuable fuels and chemicals, which can combat the emissions of greenhouse gases associated with the use of fossil resources. ... -
Numerical Modelling of Gas Production and CO2 Injection in Tight Shale Reservoirs for Enhanced Gas Recovery
(PhD thesis;560, Doctoral thesis, 2020-11)Natural gas production from shales has become exceedingly important in satisfying the ever-growing global energy demands. This unconventional hydrocarbon system is globally abundant, with large technically recoverable ... -
Particle Settling in shear thinning non-Newtonian drilling fluids : Effect of oscillatory motion
(PhD thesis UiS;537, Doctoral thesis, 2020-09)When drilling fluids circulate through the well and during the solids control operations, they are exposed to vibrations and oscillations of different frequencies and amplitudes. The secondary flow structures in oscillatory ... -
Mathematical Modelling of the Drilling Process for Real-time Applications in Drilling Simulation, Interpretation and Assistance
(PhD thesis UiS;, no.;506, Doctoral thesis, 2019)For the last thirty years, mathematical modelling has been used to develop software solutions that support drilling engineering activities at the planning stage of drilling operations. But it is only for the last decade ... -
Mathematical modeling of cancer cell migration - from in vitro to in vivo
(PhD thesis UiS;511, Doctoral thesis, 2020-05)Tumors has been the object of computational model studies for nearly five decades. The early models considered simple tumor growth based on nutrients, whereas models now can simulate from microscale gene expressions in ... -
Impact of Wettability on Rock Mechanics and Oil Recovery: A Comparative Study on Different Outcrop Chalks
(PhD thesis UiS;502, Doctoral thesis, 2020-04)Chalk reservoirs are highly fractured and are known for their remarkable storage capacity as a reservoir rock for the petroleum industry. Chalk is a sedimentary carbonate rock primarily made up of calcium carbonate (calcite, ...
RSS 2.0