Blar i Institutt for geovitenskap og petroleum på dokumenttype "Journal article"
Viser treff 101-120 av 640
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Compact Formulations for Efficient Early-Phase Field Development Optimization of Multi-Reservoir Fields
(Peer reviewed; Journal article, 2021)A compact formulation has been developed to efficiently optimize early-stage field development planning of multi-reservoir fields. The proposed formulation is a mixed-integer linear programming model which employs ... -
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 ... -
Comparing mechanical and ultrasonic behaviour of a brittle and a ductile shale: Relevance to prediction of borehole stability and verification of shale barriers
(Peer reviewed; Journal article, 2019)Borehole collapse during drilling operations in shale formations is a well-known and costly problem within the petroleum industry. Recently it has become evident that shales may also form sealing barriers around the casing, ... -
Comparison of single and mixed reagent systems for flotation of copper sulphides from Nussir ore
(Peer reviewed; Journal article, 2019)The present study investigates the application of thiol collectors and their mixtures on the flotation of copper-silver-gold minerals from a new copper mine located in northern Norway. The copper minerals (chalcopyrite, ... -
Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability
(Journal article, 2021)Weak and weathered rocks are well known for their sensitivity to changes in moisture content. Degrading behavior is common in weak rocks with moisture-sensitive mineral components and present numerous stability problems. ... -
Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers
(Journal article; Peer reviewed, 2017)This paper presents the determination of a concentration at the minimum bubble velocity (CMV) for different types of frothers, such as straight and branched alkyl chain aliphatic alcohols, 1,ω-diols, poly(propylene glycol) ... -
Constrained AVO for CO2 storage monitoring at Sleipner
(Journal article; Peer reviewed, 2017)A feasibility study of inverting for CO2 elastic properties using a model based AVO inversion is carried out. We use principal component analysis on a set of PP reflection coefficients to calculate an optimal basis function ... -
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. ... -
Continental weathering and recovery from ocean nutrient stress during the Early Triassic Biotic Crisis
(Peer reviewed; Journal article, 2022)Following the latest Permian extinction ∼252 million years ago, normal marine and terrestrial ecosystems did not recover for another 5-9 million years. The driver(s) for the Early Triassic biotic crisis, marked by high ... -
Contribution of Rock Physics Laboratory Tests and Modelling to Improving Uplift Estimates
(Journal article; Peer reviewed, 2018)Most currently applied procedures for uplift estimation rely on assumptions that porosity and seismic / log measured velocity are unaltered by the uplift process. Laboratory experiments have been performed with synthetic ... -
Controller Design and Control Structure Analysis for a Novel Oil–Water Multi-Pipe Separator
(Journal article; Peer reviewed, 2019)To enable more efficient production of hydrocarbons on the seabed in waters where traditional separator equipment is infeasible, the offshore oil and gas industry is leaning towards more compact separation equipment. A ... -
Cooling aerosols and changes in albedo counteract warming from CO2 and black carbon from forest bioenergy in Norway
(Journal article; Peer reviewed, 2018)Climate impacts of forest bioenergy result from a multitude of warming and cooling effects and vary by location and technology. While past bioenergy studies have analysed a limited number of climate-altering pollutants and ... -
A core flood and microfluidics investigation of nanocellulose as a chemical additive to water flooding for EOR
(Peer reviewed; Journal article, 2020)Cellulose nanocrystals (CNCs) and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (T-CNFs) were tested as enhanced oil recovery (EOR) agents through core floods and microfluidic experiments. ... -
Correspondence: Reply to ‘Challenges with dating weathering products to unravel ancient landscapes’
(Journal article; Peer reviewed, 2017) -
Critical synergistic concentration of binary surfactant mixtures
(Journal article; Peer reviewed, 2020) -
Crystallization and uplift path of late Variscan granites evidenced by quartz chemistry and fluid inclusions: Example from the Land's End granite, SW England
(Peer reviewed; Journal article, 2016)The megacrystic, coarse-grained granite of the Land’s End granitic complex, SW England, has been investigated by analyzing fluid inclusions, trace elements, and cathodoluminescence textures of quartz. By applying the TitaniQ ... -
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 ... -
Data descriptor: A chemical, crystallographic and magnetic characterisation of individual iron-oxide grains in Hawaiian lavas
(Journal article; Peer reviewed, 2018)Our knowledge on the behaviour of the geomagnetic field through time critically depends on how information of the past state of the field is recorded by, and stored in iron-bearing minerals such as magnetite. For small, ... -
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 ... -
Decay estimation in nonlinear hyperbolic system of conservation laws
(Journal article; Peer reviewed, 2011)In this paper we study some decay estimates in nonlinear hyperbolic system of conservation laws. This research is not only interesting in itself but also crucial in studying the large time behavior problem. By introducing ...