Blar i Institutt for geovitenskap og petroleum på emneord "VDP::Technology: 500::Rock and petroleum disciplines: 510"
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A Study of the Ultrasonic Measurements for Logging Behind a Steel Pipe: Expanding the proessing to improve the differentiation between heavy fluids and light solids
(Doctoral theses at NTNU;2019:375, Doctoral thesis, 2020)In petroleum applications using acoustic wave theory, the most used practice can be found in borehole geophysical methods, where acoustic logging has long been the foremost source for cement evaluation. Due to stricter ... -
An experimental and multiscale numerical study of mechanical and tribological behavior of cemented tungsten carbides and hard rocks in percussive drilling
(Doctoral theses at NTNU;2016:284, Doctoral thesis, 2016)Presented research is about deep rotary-percussive drilling (RPD) in hard rock formations. RPD is recognized as an effective method for tunnel excavation and well boring in hard igneous rocks. Rock fragmentation and chipping ... -
Applicability of Unlined/Shotcrete Lined Pressure Tunnels for Hydropower Projects in the Himalaya
(Doctoral theses at NTNU;2018:357, Doctoral thesis, 2018)Nowadays, unlined or shotcrete lined pressure tunnels and shafts are used in hydropower projects worldwide. The prime requirements for these tunnels and shafts are that they should be economically attractive and should be ... -
Architecture, Morphometry and Development of Subaqueous Sediment Conduits
(Doctoral theses at NTNU;2021:75, Doctoral thesis, 2021)Canyons, channels, and gullies are incised features on the surface of the earth that act as subaqueous conduits for transferring sediment from source areas to basins. For several decades, these subaqueous sediment conduits ... -
Assessment of High Pressure Pre-Excavation Rock Mass Grouting in Norwegian Tunneling
(Doctoral theses at NTNU;2019:262, Doctoral thesis, 2019)Due to growth of the population in cities and limited space there is an increasing trend to move transportation systems, such as roads and railroads underground. Furthermore, Norway is a rugged country with deep fjords, ... -
Computational and robustness improvements in waveform inversion
(Doctoral theses at NTNU;2022:313, Doctoral thesis, 2022) -
Data-Driven Reservoir Modeling: Application of Proxy Models in Reservoir Management
(Doctoral theses at NTNU;2023:183, Doctoral thesis, 2023)This Ph.D. thesis consists of 8 papers that summarize the main contents of the research work done over the past 3 years. Due to the ability of machine learning (ML) in capturing high nonlinearity, the thesis mainly touches ... -
Enhanced Oil Recovery by Low Salinity Surfactant: Effect of Ions on Core and Pore Scales
(Doctoral theses at NTNU;2016:211, Doctoral thesis, 2016)Enhanced oil recovery (EOR) by surfactants is a well-established method in the petroleum industry. In a surfactant flooding, oil is mobilized and recovered by reduction of the interfacial tension (IFT) between oil and water ... -
Experimental investigation of surface-functionalised silica nanoparticles for enhanced oil recovery
(Doctoral theses at NTNU;2020:66, Doctoral thesis, 2020)Enhanced oil recovery (EOR) using nanoparticles (NPs) has been proposed as a solution in the petroleum industry to overcome declining production rates. Research has shown that commercially available hydrophilic silica NPs, ... -
Experimental Study of Flow of Nanocellulose in Porous Media for Enhanced Oil Recovery Application
(Doctoral theses at NTNU;2019:339, Doctoral thesis, 2019) -
A framework for evaluating deep sea mining systems for seafloor ma ssive sul phides deposits
(Doctoral theses at NTNU;2020:280, Doctoral thesis, 2020)Loki’s Castle, a SMS site of interest located in the Norwegian jurisdiction, was used to illustrate the established framework. The established economic block model was used to support a sensitivity analysis which shows ... -
Frequency-dependent wave velocities in sediments and sedimentary rocks
(Doctoral theses at NTNU;2022:52, Doctoral thesis, 2022) -
A Geometallurgical Approach Applied to the Tromsdalen Calcite Operation
(Doctoral theses at NTNU;2020:161, Doctoral thesis, 2020)The motivation behind the thesis was to increase the knowledge and to expand the possibilities within industrial mineral mining, an important mining sector in Norway. This was done through extensive deposit study and an ... -
Groundwater heat pump systems. New insights on system design and on fluid flow in unconsolidated aquifers
(Doctoral theses at NTNU;2021:336, Doctoral thesis, 2021)This PhD thesis concerns groundwater heat pump (GWHP) systems in Norway, which are systems that utilize groundwater as a source of thermal energy for heating and cooling applications in buildings. GWHP systems can typically ... -
Integration of Electromagnetic and Seismic data to improve sub-salt and sub-basalt imaging
(Doctoral theses at NTNU;2021:147, Doctoral thesis, 2021)This thesis investigates how the marine Controlled Source Electromagnetic (CSEM) method and the marine MagnetoTelluric (MT) method can be used in combination for subsurface imaging in the presence of basalt and salt. A ... -
Long-term impact on unlined tunnels of hydropower plants due to frequent start/stop sequences
(Doctoral theses at NTNU;2021:400, Doctoral thesis, 2021)Abstract The concept of unlined pressure tunnel design is well-tested and has a history of more than 100 years. In Norway, more than 95% of hydropower pressure tunnels are unlined and most of it was built between 1950 ... -
Magmatic evolution of the Gállojávri ultramafic intrusion, Norway: Implicaitons for the formation of magmatic sulphide deposits in the Karasjok Greenstone Belt
(Doctoral theses at NTNU;2023:75, Doctoral thesis, 2023) -
Methodologies to Determine Cost-Effective Development Strategies for Offshore Fields During Early-Phase Studies Using Proxy Models and Optimization
(Doctoral theses at NTNU;2020:67, Doctoral thesis, 2020)This thesis summarizes research efforts for developing a structured methodology for decision support in feasibility studies and concept planning phases of oil and gas field development. The objective in developing the ... -
Modelling and Experimental Study on the Production of Gas Wells with Associated Liquid
(Doctoral theses at NTNU;2020:340, Doctoral thesis, 2020)Once a gas field is developed liquid production may start and persists sometime during the production life of most dry gas wells. This liquid could be condensate, water, or both, resulting from condensate dropout due to ... -
Numerical Simulation of Fracture Geomechanics: Geothermal, CCS and Petroleum applications
(Doctoral theses at NTNU;2019:370, Doctoral thesis, 2019)