Institutt for geovitenskap og petroleum: Recent submissions
Now showing items 21-40 of 2565
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Utløsning av jordskred - Sammenheng mellom landskap og skredaktivitet
(Master thesis, 2024)Jordskred er ikke den største geofaren i Norge, men likevel en geofare som har stått for store ødeleggelser på veier og bygninger, og som har krevd menneskeliv. Med forespeilet økning av ekstremvær og utløsning av jord- ... -
Data-driven derivative-free trust-region model-based method for resource allocation problems
(Peer reviewed; Journal article, 2023)Allocating a limited available resource between a set of units is a problem that arises in several application areas. We propose an online derivative-free trust-region model-based method to tackle a fairly general version ... -
Leakage prediction and post-grouting assessment in headrace tunnel of a hydropower project
(Chapter, 2024)In the Himalayan region, tunnels are often constructed through complex and varying geological formations having rock mass with higher degree of jointing, faulting, folding, and weakness/shear zones. Such rock mass condition ... -
Planning and support estimation of underground powerhouse in the Himalayas
(Chapter, 2024)Underground structures like tunnels and caverns have major advantages in hydropower projects. Tunnels are used for transporting the water from the intake to the tailrace outlet through the turbines whereas caverns primarily ... -
The Storfosna Sandstone on Kråkvåg
(Master thesis, 2024)Devonske Storfosnaformasjonen på Kråkvåg har blitt undersøkt med mål om å fastslå dens avsetningsmiljø. I tillegg har bergartsgrensen mellom Kråkøya granittkonglomerat og Storfosnaformasjonen blitt studert, for å forstå ... -
Stability Challenges and Remedial Practices in Himalayan Hydropower Tunnels – A Review
(Journal article; Peer reviewed, 2024)The instability in tunnels is mainly affected by geological anomalies, rock mass quality, complex geological structures, active tectonics, and stress anisotropy. This review article presents challenges associated with ... -
Systematic Study of Wettability Alteration of Glass Surfaces by Dichlorooctamethyltetrasiloxane Silanization─A Guide for Contact Angle Modification
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A Novel Warning Identification Framework for Risk-Informed Anomaly Detection
(Peer reviewed; Journal article, 2023)Cyber-physical systems are taking on a permanent role in the industry, such as in oil and gas or mining. These systems are expected to perform increasingly autonomous tasks in complex settings removing human operators from ... -
Polynomial Chaos Expansion for Uncertainty Quantification in Closed-Loop Reservoir Management
(Chapter, 2023)Closed-loop reservoir management (CLRM) is a model-based optimal control procedure that aims at optimizing oil and gas production strategies under both physical and operational constraints and large model uncertainties. ... -
Joint well-placement and well-control optimization for energy-efficient water flooding of oil fields
(Journal article; Peer reviewed, 2023)Hydrocarbon production driven by water flooding is energy-intensive. This paper presents well-placement and joint well-placement-and-control optimization studies with objective function taking into account emissions, ... -
Precision calculation of the entrance length for laminar flow of Bingham fluid between parallel plates with yield number from 0 to 1000
(Journal article; Peer reviewed, 2024)An estimate of the entrance length for a Bingham fluid flowing between parallel plates is needed in engineering applications. The dimensionless entrance length is a function of yield number. The primary objective of this ... -
Modeling of Subsea CO2 Transportation and Injection Pipe Networks, The Case of Snøhvit
(Master thesis, 2024)Gassinjeksjon har vært brukt i olje- og gassindustrien i mange år og har bidratt til å utvinne millioner av fat som ikke kunne blitt utvunnet med den primære drivmekanismen. Distribusjonsnettverk for gassinjeksjon blir ... -
Comparative Study of Hydrogen Reduction of Bauxite Residue-Calcium Sintered and Self-Hardened Pellets Followed by Magnetic Separation for Iron Recovery
(Journal article; Peer reviewed, 2023)To minimize the carbon footprint in the industrial valourization of bauxite residue, hydrogen was used as a reducing agent. The current study experimentally investigated hydrogen reduction of bauxite residue-CaO sintered ... -
Energy efficiency of oil and gas production plant operations
(Journal article; Peer reviewed, 2023)The exploitation of subsurface resources is an energy-intensive activity leading to substantial emissions. The main energy consumer for hydrocarbon production is gas compression and pumping. In this article, we investigate ... -
A Review of Intelligent Decision-Making Strategy for Geological CO2 Storage: Insights from Reservoir Engineering
(Journal article; Peer reviewed, 2024)In a world characterized by a heavy reliance on fossil fuels, it becomes imperative to strike a harmonious balance between energy demands and carbon mitigation. This article delves into the practice of injecting carbon ... -
Reservoir Charecterization Based on S Waves Singularity directions
(Master thesis, 2024)Reservoarkarakterisering er avgjørende for styring av hydrokarbonreservoarer. Nylige fremskritt legger vekt på verdien av å inkorporere skjæringsbølger, spesielt ved analyse av singularitetsretninger – retninger med unik ... -
Investigating Load Arches and the Uplift Capacity of Rock Anchors: A Numerical Approach
(Journal article; Peer reviewed, 2024)Rock anchors, which can withstand substantial forces and are essential for securing the foundations of the built environment, can fail due to steel tensile failure, bond detachment, or rock mass fracturing through uplift. ... -
Decision support methods for optimizing subsea hydrocarbon production systems with processing equipment
(Doctoral theses at NTNU;2024:111, Doctoral thesis, 2024)As the use of subsea processing increases and technology advances, subsea layout possibilities and configurations diversify and get more complex, causing manual design processes to be cumbersome and often suboptimal. ... -
Waterproof sprayed concrete with improved sustainability performance
(Chapter, 2023)Sprayed concrete in combination with rock bolts has successfully been used for permanent rock support in tunnels for decades. The main shortcoming is that sprayed concrete alone is unable to function as permanent waterproofing ... -
Understanding the impact of stress release on sandstone using sound waves: rock physics, applications and code
(Doctoral theses at NTNU;2024:100, Doctoral thesis, 2024)The acoustic and elastic responses of sandstones vary with changes in effective stress. Laboratory measurements have indicated that among different types of sandstones, velocities and elastic moduli of weakly cemented ...