Institutt for geovitenskap og petroleum
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Organosilane and lignosulfonate as innovative stabilization techniques for crushed rocks used in road unbound layers
(Peer reviewed; Journal article, 2020)The tunnelling operations connected to the construction of the new Norwegian E39 highway generate a considerable amount of blasted rocks. The local use of these rocks as construction materials in the unbound layers of the ... -
An overview of calcite recovery by flotation
(Peer reviewed; Journal article, 2020)In general, precipitated calcium carbonate (PCC) is used as amineral filler in paper industries; while natural calcite (CaCO3) ore is also suitable for industrial use if it is a finely ground high-grade material. Naturally, ... -
Contact Angles in Two-Phase Flow Images
(Peer reviewed; Journal article, 2020)In this work, we calculate contact angles in X-ray tomography images of two-phase flow in order to investigate the wettability. Triangulated surfaces, generated using the images, are smoothed to calculate the contact angles. ... -
Liquiñe‑Ofqui’s fast slipping intra‑volcanic arc crustal faulting above the subducted Chile Ridge
(Peer reviewed; Journal article, 2021)The southernmost portion of the Liquiñe-Ofqui fault zone (LOFZ) lies within the proposed slab window which formed due to oblique subduction of the Chile Ridge in Patagonia. Mapping of paleo-surface ruptures, offsets, and ... -
Geometrically derived efficiency of slow immiscible displacement in porous media
(Peer reviewed; Journal article, 2020)The efficiency of a displacement is the fraction of applied work over the change in free energy. This displacement efficiency is essential for linking wettability to applied work during displacement processes. We quantify ... -
Hysteresis of Natural Magnetite Ensembles: Micromagnetics of Silicate‐Hosted Magnetite Inclusions Based on Focused‐Ion‐Beam Nanotomography
(Peer reviewed; Journal article, 2020)Three‐dimensional geometries of silicate‐hosted magnetic inclusions from the Harcus intrusion, South Australia have been determined using focused‐ion‐beam nanotomography (FIB‐nt). By developing an effective workflow, the ... -
Application of nanoparticles for oil recovery.
(Peer reviewed; Journal article, 2021)Due to their large surface-area-to-volume ratio and enhanced chemical reactivity, nanoparticles have attracted interest among researchers in the upstream petroleum industry for oil recovery applications. Nanoparticles have ... -
Dither signals optimization in constrained multi-agent extremum seeking control
(Peer reviewed; Journal article, 2021)In this paper we consider the problem of optimization of a multi-agent system with constraints through perturbations-based extremum seeking control. We demonstrate that for such systems, effects of dither signals applied ... -
Mapping and modelling mineral sources of natural remanent magnetization from the Russell Belt microcline-sillimanite gneiss, Northwest Adirondack Mountains, USA
(Peer reviewed; Journal article, 2021)Distinct crustal remanent magnetic anomalies are a strong indicator of rocks with stable natural remanent magnetization (NRM) carriers. The latter are able to store information on the history of a rock over long geological ... -
Separating geometry- from stress-induced remanent magnetization in magnetite with ilmenite lamellae from the Stardalur basalts, Iceland
(Peer reviewed; Journal article, 2020)Realistic geometries of magnetite grains from the Stardalur volcano, Iceland, were obtained by Focused Ion Beam Scanning Electron Microscopy nanotomography. These magnetite grains are subdivided by oxidation‐exsolution ... -
An improved model for predicting liquid loading onset in inclined pipes with non-uniform liquid wall films
(Peer reviewed; Journal article, 2021)Liquid loading is a phenomenon in which liquid accumulates in the wellbore of mature gas wells, causing a significant reduction in production and sometimes permanent well abandonment. This paper introduces a new model for ... -
Fluid Flow and Leakage Assessment Through an Unlined/Shotcrete Lined Pressure Tunnel: A Case from Nepal Himalaya
(Peer reviewed; Journal article, 2021)The use of unlined/shotcrete lined pressure tunnels and shafts are cost-efective solutions for a hydropower project and are being implemented worldwide. To implement this concept, the ground conditions at the area of concern ... -
Rock Stress Measurements for Unlined Pressure Tunnels: A True Triaxial Laboratory Experiment to Investigate the Ability of a Simplified Hydraulic Jacking Test to Assess Fracture Normal Stress
(Peer reviewed; Journal article, 2021)To avoid hydraulic failure of unlined pressure tunnels, knowledge of minimum principal stress is needed. Such knowledge is only obtainable from in situ measurements, which are often time-consuming and relatively costly, ... -
Multi-objective mixture design of cemented paste backfill using particle swarm optimisation algorithm
(Peer reviewed; Journal article, 2020)In order to achieve a successful cemented paste backfill (CPB) mixture design, multiple project requirements such as strength, flowability and cost should be met. For this achievement, the key design parameters, solid ... -
Closed-Form Solution to the Poromechanics of Deep Arbitrary-Shaped Openings Subjected to Rock Mass Alteration
(Peer reviewed; Journal article, 2020)The aim of this paper is to propose a closed-form solution to the poromechanics problem of stress and pore pressure distribution around noncircular openings at great depth subjected to hydrostatic water pressure and far-field ... -
Estimating the blast sill thickness using changepoint analysis of MWD data
(Peer reviewed; Journal article, 2020)Measurement while drilling (MWD) data are collected during production drilling in the open pit operation in question. On every bench in the open pit, a fractured marble zone (sill) is left on top of the hard and un-fractured ... -
Tunnelling challenges in Nepal
(Chapter, 2004)Nepal is a landlocked mountainous country with a population of approximately 23 millions. Being steep in topography and having many rivers originating from the glaciers of the Himalaya, Nepal has been gifted in the field ... -
Real-Time Minimization of Mechanical Specific Energy with Multivariable Extremum Seeking
(Peer reviewed; Journal article, 2021)Drilling more efficiently and with less non-productive time (NPT) is one of the key enablers to reduce field development costs. In this work, we investigate the application of a data-driven optimization method called ... -
Magnetic mapping of fault zones in the Leka Ophiolite Complex, Norway
(Peer reviewed; Journal article, 2020)The island of Leka and surrounding skerries expose a complete suite of ophiolitic rocks, which are heavily faulted. Large areas consist of ultramafic rocks, which are locally hydrated and form serpentinites. Faults are ... -
Improved design of unlined air cushion surge chambers
(Peer reviewed; Journal article, 2021)An overview of important design considerations for unlined air cushion surge chambers is given and three innovative solutions that can enable a safer and more economic design are presented. The paper is based on information ...
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