Blar i Vitenskapelige publikasjoner (TN-IEP) på tittel
Viser treff 41-60 av 222
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CO2 methanation on hydrotalcite-derived catalysts and structured reactors: A review
(Peer reviewed; Journal article, 2020)CO2 methanation reaction has attracted renewed interest since the power-to-gas (PtG) concept emerged as a promising alternative for CO2 emission abatement using surplus renewable electricity. Although the reaction has been ... -
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 ... -
Comparison of different configurations of a solar-assisted ground-source CO2 heat pump system for space and water heating using Taguchi-Grey Relational analysis
(Peer reviewed; Journal article, 2023)This work deals with the comparison of different optimized configurations of solar-assisted ground-source CO2 heat pump systems using the Taguchi method and Grey Relational Analysis (GRA) when used for simultaneous space ... -
Comparison of Lost Circulation Material Sealing Effectiveness in Water-Based and Oil-Based Drilling Fluids and Under Conditions of Mechanical Shear and High Differential Pressures
(Peer reviewed; Journal article, 2022)A study was conducted to assess the performance of granular and fibrous lost circulation materials as preventative treatments and in remedial treatment of lost circulation in water-based and oil-based drilling fluids. For ... -
A compressible viscous three-phase model for porous media flow based on the theory of mixtures
(Peer reviewed; Journal article, 2020)In this paper we focus on a general model to describe compressible and immiscible three-phase flow in porous media. The underlying idea is to replace Darcy’s law by more general momentum balance equations. In particular, ... -
Computational fluid dynamics simulation of buoyant mixing of miscible fluids in a tilted tube
(Peer reviewed; Journal article, 2021)Buoyancy-driven flows and mixing of fluids with different densities occur frequently both in nature and as part of industrial processes within chemical and petroleum engineering. This work investigates the buoyant exchange ... -
Concentric cylinder viscometer flows of Herschel-Bulkley fluids
(Peer reviewed; Journal article, 2019)Drilling fluids and well cements are example non-Newtonian fluids that are used for geothermal and petroleum well construction. Measurement of the non-Newtonian fluid viscosities are normally performed using a concentric ... -
Convective Heat Transfer and Pumping Power Analysis of MWCNT + Fe3O4/Water Hybrid Nanofluid in a Helical Coiled Heat Exchanger with Orthogonal Rib Turbulators
(Peer reviewed; Journal article, 2021-02)Utilizing nanofluids in heat exchangers can lead to improved thermal performance. Nanofluids with suspended carbon nanotubes are specifically desirable in thermal systems because of their unique capabilities. In this study, ... -
Criterion for sufficiently large dither amplitude to mitigate non-linear glitches
(Chapter, 2023)A model describing glitch disturbances is introduced and analysed. The model is used to find the response of glitch disturbances when adding a periodic dither to the input and applying low-pass filtering to the output. ... -
A critical review on production, modification and utilization of biochar
(Peer reviewed; Journal article, 2021)There has been an increased interest in the production of sustainable biochar in the past years, as biochar shows versatile physicochemical properties and, can have a wide applicability in diverse fields. Comprehensive ... -
A Critical Review on the Use of Shallow Geothermal Energy Systems for Heating and Cooling Purposes
(Peer reviewed; Journal article, 2022)The reduction of CO2 emissions has become a global concern. In this regard, the EU intends to cut CO2 emissions by 55% by 2030 compared to those of 1990. The utilization of shallow geothermal energy (SGE) in EU countries ... -
Cuttings transport with oil- and water-based drilling fluids
(Chapter, 2021)Deviated well sections are common in modern well construction. In mature areas like the North Sea region, practically all producers or injector wells will have highly deviated sections. These wells must be drilled and ... -
Data-Driven Approaches Tests on A Laboratory Drilling System
(Peer reviewed; Journal article, 2020)In recent years, considerable resources have been invested to exploit vast amounts of data that get collected during exploration, drilling and production of oil and gas. Data-related digital technologies potentially become ... -
Data-driven sensitivity analysis of complex machine learning models: A case study of directional drilling
(Peer reviewed; Journal article, 2020-12)Classical sensitivity analysis of machine learning regression models is a topic sparse in literature. Most of data-driven models are complex black boxes with limited potential of extracting mathematical understanding of ... -
Day-ahead optimal scheduling of micro gas turbine-based microgrid considering electricity and heating energy
(Peer reviewed; Journal article, 2023)Microgrids are considered as the crucial element in the integration of various distributed energy resources in buildings. They are capable of operating in both grid-connected and islanded mode and have shown immense potential ... -
Decarbonization of the Iron and Steel Industry With Direct Reduction of Iron Ore with Green Hydrogen
(Peer reviewed; Journal article, 2020)Production of iron and steel releases seven percent of the global greenhouse gas (GHG) emissions. Incremental changes in present primary steel production technologies would not be sufficient to meet the emission reduction ... -
Decarbonizing primary steel production : Techno-economic assessment of a hydrogen based green steel production plant in Norway
(Peer reviewed; Journal article, 2022)High electricity cost is the biggest challenge faced by the steel industry in transitioning to hydrogen based steelmaking. A steel plant in Norway could have access to cheap, emission free electricity, high-quality iron ... -
Design and Early Age Performance of Sustainable One-Part Geopolymers for Well Cementing
(Peer reviewed; Journal article, 2023-10)One-part geopolymers, known as “just add water” (JAW), alkali-activated formulation is presented in this work. This work reveals the design and development of short-term properties of JAW geopolymers for use in oilwell ... -
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 ... -
Development of a novel experimental technique for the measurement of residual wall layer thickness in water-oil displacement flows
(Peer reviewed; Journal article, 2023)The effective removal and displacement of fluids is important in many industrial and environmental applications, such as for operation and cleaning of process equipment, fluid injection in porous media for oil recovery or ...