Blar i Vitenskapelige publikasjoner (TN-IEP) på utgivelsesdato
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Rayleigh and Wood anomalies in the diffraction of acoustic waves from the periodically corrugated surface of an elastic medium
(Peer reviewed; Journal article, 2016)By the use of the Rayleigh method we have calculated the angular dependence of the reflectivity and the efficiencies of several other diffracted orders when the periodically corrugated surface of an isotropic elastic medium ... -
Energy, exergy and environmental analysis of a novel combined system producing power, water and Hydrogen
(Peer reviewed; Journal article, 2017)During last years, absorption heat transformers have been used widely for boosting low-grade heat sources. In this paper, a novel multi-generation system including an open absorption heat transformer (OAHT), an organic ... -
The Effect of Different Drilling Fluids on Mechanical Friction
(Peer reviewed; Journal article, 2017)A very important aspect in highly inclined wellbores is the mechanical friction. For extended reach drilling (ERD) and through tubing extended reach drilling (TTERD) this can be a limiting factor. Friction caused by the ... -
Footprints of spontaneous fluid redistribution on capillary pressure in porous rock
(Journal article; Peer reviewed, 2017-05)Pore-scale imaging of two-phase flow in porous media shows that pore filling occurs as cooperative events with accompanying spontaneous fluid redistribution in other parts of the pore space. We present a level set method ... -
Unravelling key controls on the rift climax to post-rift fill of marine rift basins: insights from 3D seismic analysis of the Lower Cretaceous of the Hammerfest Basin, SW Barents Sea
(Journal article, 2017-10)In this study, we investigate key factors controlling the rift climax to post-rift marine basin fill. We use two- and three-dimensional seismic data in combination with sedimentological core descriptions from the Hammerfest ... -
Downhole Temperature Modeling for Non-Newtonian Fluids in ERD Wells
(Journal article; Peer reviewed, 2018)Having precise information of fluids' temperatures is a critical process during planning of drilling operations, especially for extended reach drilling (ERD). The objective of this paper is to develop an accurate temperature ... -
Rheological characterization of Polyanionic Cellulose solutions with application to drilling fluids and cuttings transport modeling
(Peer reviewed; Journal article, 2018)In petroleum drilling, aqueous Polyanionic Cellulose solutions (PAC) are often used as a drilling fluid model system in experimental laboratory studies to investigate cuttings transport. Cuttings transport refers to the ... -
Investigation of a new application for cellulose nanocrystals: a study of the enhanced oil recovery potential by use of a green additive
(Journal article; Peer reviewed, 2018-02)Cellulose nanocrystals (CNC) were investigated for use in a potential new application, enhanced oil recovery. Core flooding experiments were performed on outcrop sandstone cores using CNC particles dispersed in low salinity ... -
Miscible CO2 flooding for EOR in the presence of natural gas components in displacing and displaced fluids
(Journal article; Peer reviewed, 2018-02)Carbon dioxide (CO2) flooding is a complicated process as it involves phase behavior. The objective of this work was to understand the mass transfer mechanisms during flooding with CO2 and CO2/C1/C3 (CO2/HC) based on ... -
Determinants of oil and gas investments on the Norwegian Continental Shelf
(Journal article; Peer reviewed, 2018-02)This paper studies the investment decisions by oil and gas companies operating on the Norwegian Continental Shelf. We account for the heterogeneity across the fields by including field-specific variables, including geological ... -
Stability assessment of PITT tracer candidate compounds: the case of benzyl alcohols
(Journal article; Peer reviewed, 2018-04)The selection of compounds used as inter-well tracers has traditionally been done taking into consideration the goal of the test and the ease in analyzing the chemicals used. This often led to improper selection of the ... -
Influence of Fracture Heterogeneity Using Linear Congruential Generator (LCG) on the Thermal Front Propagation in a Single Geothermal Fracture-Rock Matrix System
(Journal article; Peer reviewed, 2018-04)An implicit finite difference numerical model has been developed to investigate the influence of fracture heterogeneity on the propagation of thermal front in a single horizontal fracture-matrix system. Instead of depending ... -
Surface Forces Apparatus Measurements of Interactions between Rough and Reactive Calcite Surfaces
(Journal article; Peer reviewed, 2018-05)Nm-range forces acting between calcite surfaces in water affect macroscopic properties of carbonate rocks and calcite-based granular materials, and are significantly influenced by calcite surface recrystallization. We ... -
Dynamic interfacial tension measurement method using axisymmetric drop shape analysis
(Journal article; Peer reviewed, 2018-06)The current method describes a simple modification to the dynamic and equilibrium interfacial tension (IFT) measurement in a multiphase system (gas-liquid/liquid-liquid) by the Axisymmetric Drop Shape Analysis (ADSA) pendant ... -
Effect of Silica nanoparticles on fluid/rock interactions during low salinity water flooding of chalk reservoirs
(Journal article; Peer reviewed, 2018-07)Abstract: The main objective of this work is to address the adsorption of Silica nanoparticles (NPs) dispersed in different brines on chalk surfaces and their effect on fluid/rock interaction. Isothermal static and dynamic ... -
Review and investigations on geothermal energy extraction from abandoned petroleum wells
(Journal article; Peer reviewed, 2018-08)Geothermal energy is a sustainable and renewable energy source, which can be used in electricity production, space heating/cooling, and other industrial applications. In the recent years, it has been gathering more and ... -
Colloid transport in a single fracture-matrix system: Gravity effects, influence of colloid size and density
(Journal article; Peer reviewed, 2018-10)A numerical model was developed to investigate the influence of gravitational force on the transport of colloids in a single horizontal fracture–matrix system. Along with major transport phenomena, prominence was given to ... -
Effects of polymer adsorption on the effective viscosity in microchannel flows: phenomenological slip layer model from molecular simulations
(Journal article; Peer reviewed, 2018-10)Molecular simulations (Dissipative Particle Dynamics - DPD) were used to quantify the effect of polymer adsorption on the effective shear viscosity of a semi-dilute polymer solution in microchannel Poseuille flow. It is ... -
Interfacial tension and CO2 diffusion coefficients for a CO2 + water and n-decane system at pressures of 10 to 160 bar
(Journal article; Peer reviewed, 2018-11)The objective of this study is to address the influence of different CO2 phases and degrees of CO2 saturation on the interfacial tension and the diffusion of CO2 into a hydrocarbon drop. Axisymmetric drop shape analysis ... -
Fluid flow properties of the Wilhelmøya Subgroup, a potential unconventional CO2 storage unit in central Spitsbergen
(Journal article; Peer reviewed, 2018-11)The Upper Triassic to Middle Jurassic Wilhelmøya Subgroup forms one of the more suitable reservoir units on the Norwegian Arctic archipelago of Svalbard. The target siliciclastic storage unit, which is encountered at approx. ...