Institutt for geovitenskap og petroleum
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Real-Time Data-Driven Drilling Optimization
(Doctoral theses at NTNU;2021;348, Doctoral thesis, 2021)Drilling a well for exploration or production of petroleum resources is a costly and complicated procedure. There is a great potential for cost reduction by drilling safer, faster and with less Non-Productive Time (NPT). ... -
Cyclic fatigue in unlined hydro tunnels caused by pressure transients
(Peer reviewed; Journal article, 2021)Regulated hydropower is currently the most capable load balancing technology for the future renewable energy system which will be characterized by a large share of unregulated energy from solar and wind power. Increased ... -
The controlling factors for runout lengths for “steinskred” in Hordaland, developing of a new α-β method for “steinskred” and analyses of the flow behavior “steinskred” event in Modalen, 1953
(Master thesis, 2021)Steinskred er en norsk betegnelse på et lite fjellskred eller et stort steinsprang. Denne faren er et velkjent fenomen i Norge, og kan forårsake katastrofale hendelser hvis den har rekkevidde som treffer hus eller annen ... -
Reliable Unmanned Autonomous Systems: Conceptual Framework for Warning Identification during Remote Operations
(Journal article, 2021)In the offshore industry, unmanned autonomous systems are expected to have a permanent role in future operations. During offshore operations, the unmanned autonomous system needs definite instructions on evaluating the ... -
Experimental Analysis and Characterization of Deep-Sea Sediment Samples From Loki's Castle and Mohn's Treasure
(Master thesis, 2021)Verden står i dag overfor det grønne skiftet. Ved overgang til grønn energi, vil behovet for metaller som kobber, sink og kobolt øke. I tilleg til å skape et insentiv for arealkonflikter fører den kontinuerlige utnyttelsen ... -
Forkastningsarkitektur, deformasjonsprodukter og omvandling i en kompleks forkastningssone i Pervika, Sør-Trøndelag
(Master thesis, 2021)Pervika forkastningssone, i Sørvest-Trøndelag, er en kompleks forkastningssone som har tilhørighet til Møre-Trøndelag forkastningskompleks (MTFK). De to forkastningene studert i Pervika, viser en komplisert utvikling, med ... -
Grunnvanns- og løsmassekartlegging med georadar for etablering av et akvakulturanlegg på Frya i Gudbrandsdalen
(Master thesis, 2021)En åpen akvifer på Frya er blitt kartlagt systematisk med georadar for å kartlegge grunnvannsstrømmen, interaksjonen mellom akviferen og elvene Frya og Gudbrandsdalslågen, samt løsmassemektigheten og -sammensetningen. ... -
Million node fracture: size matters?
(Peer reviewed; Journal article, 2021)Transmissivity of self-affine fractures was computed numerically as a function of the grid size. One-million-node fractures (1024 × 1024 nodes) with fractal dimensions of 2.2–2.6 were cut into successively smaller fractures ... -
Linking molecular structures of yeast-derived biosurfactants with their foaming, interfacial, and flotation properties
(Peer reviewed; Journal article, 2021)Yeast-derived bola amphiphiles have attracted growing attention in various industrial sectors as green reagents. However, their physico-chemical properties relevant to mineral separation by froth flotation are poorly ... -
A Mathematical Programming Approach to Determine Optimal Tieback Development Concepts of Two Offshore Oil Fields in the Barents Sea
(Chapter, 2021)In this paper, we present a mathematical programming approach to evaluate the conceptual study of regional integrated development for Alta-Gohta discoveries in the Barents Sea. Two alternative scenarios are investigated, ... -
Numerical Modelling of the Stress Field and Failure Behaviour of Grouted Rocks
(Master thesis, 2021)Denne masteroppgaven undersøkte den forsterkende effekten fra injeksjon av bergprøvestykker som inneholder åpne sprekker av varierende lengde og fallvinkel, gjennom numerisk modellering. Til dette formålet ble to- og ... -
Subsea field layout optimization (part II)–the location-allocation problem of manifolds
(Peer reviewed; Journal article, 2022)The location-allocation problem of manifolds, which is a part of subsea field layout optimization, directly affects the flowline cost. This problem has always been studied as a mixed-integer nonlinear programming (MINLP) ... -
Subsea field layout optimization (part III) --- the location-allocation problem of drilling sites
(Peer reviewed; Journal article, 2022)This study proposes an efficient method to optimize the subsea field layout with the aim of minimizing the subsea field development cost, based on the two methods introduced in Part I and Part II for solving the well ... -
Subsea field layout optimization (Part I) – directional well trajectory planning based on 3D Dubins Curve
(Peer reviewed; Journal article, 2022)Directional well trajectory planning, which includes the optimization of the drilling site location and the trajectory between the drilling site to the completion interval, plays an important role in reducing subsea field ... -
Visualizing and quantifying wettability alteration by silica nanofluids
(Peer reviewed; Journal article, 2021)An aqueous suspension of silica nanoparticles or nanofluid can alter the wettability of surfaces, specifically by making them hydrophilic and oil repellent under water. Wettability alteration by nanofluids has important ... -
Experimental Investigation of Osmosis and Spontaneous Emulsification During Low Salinity Flooding
(Master thesis, 2021)This experimental study investigates the osmosis and the spontaneous emulsification as oil mobilization mechanisms during the low salinity water flooding by measuring the connate water expansion area in an oil-wet microfluidic ... -
A flotation-based approach to the quantification of pyrrhotite in concrete aggregates
(Journal article; Peer reviewed, 2021)Pyrrhotite-bearing aggregates are a major cause of internal sulphate attack (ISA) in concrete. The concentration of pyrrhotite is usually too low to permit direct accurate quantification. Hence, safety restrictions put on ... -
Fluid Displacement in a 2D DFN Fracture: Time Integration of the Interface Position
(Journal article; Peer reviewed, 2021) -
Effects of Confining Stress on the Post-Peak Behaviour and Fracture Angle of Fauske Marble and Iddefjord Granite
(Peer reviewed; Journal article, 2019)In general, the strength of rock and rock mass is non-linearly associated with the confining stress. Thus, the non-linear Hoek–Brown strength criterion (Hoek and Brown 1980, 1982) is more appropriate than the linear ...
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