Blar i Institutt for geovitenskap og petroleum på dokumenttype "Chapter"
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Deep Sea Mining: Towards Conceptual Design for Underwater Transportation
(Chapter, 2020)This paper presents the first steps towards conceptual design for the underwater transportation of minerals from seabed to shore for deep sea mining (DSM). The methodology is based on conceptual design using a systematic ... -
Design of unlined pressure tunnels in Norway – limitations of empirical overburden criteria and significance of in-situ rock stress measurements
(Chapter, 2020)A key requirement for unlined pressure tunnels is confinement, i.e. that the minimum principal stress must exceed the internal water pressure. Failure to meet this requirement can cause hydraulic jacking of the rock mass, ... -
Development of dynamic safety envelopes for autonomous remotely operated underwater vehicles
(Chapter, 2018)This paper describes the implementation of dynamic safety envelopes for Autonomous Remotely Operated Vehicles (AROVs). A safety envelope is defined as a three-dimensional spatial area around the AROV, which forms a virtual ... -
Development Of Efficient Constraint-Handling Approaches For Well Placement Optimization
(Chapter, 2018)Efficient constraint-handling methodology is developed to solve for a set of concurrent geometric well placement constraints. This implementation enhances constraint-handling capability such that expert knowledge may more ... -
Diffuse soil contamination by antimony
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Dither signal optimization for multi-agent extremum seeking control
(Chapter, 2020)In this paper we formulate and solve the problem of multi-agent extremum seeking with dither signals optimization. The solution is a distributed perturbation-based extremum-seeking controller with an additional objective ... -
Dynamic rock support in burst-prone rock masses
(Chapter, 2018)Rockburst occurs in hard and strong rock after excavation when the in situ rock stresses are high. The “driving force” for rockburst is the energy released from the rock mass. The released strain and seismic energy is ... -
Effect of non-linear elasticity on stress paths in depleted reservoirs and their surroundings
(Chapter, 2020)The prediction of stress and strain changes in and around reservoir using numerical simulators is often based on assumption of linear elasticity before reaching yield point. However, it is known that rocks are generally ... -
Effect of Preconditioning and Ageing on Rheological Properties of Model Drilling Fluids
(Chapter, 2017)Many drilling fluids are thixotropic, meaning that viscosity decreases with time when subjected to shear. Other fluids may show anti-thixotropic (rheopectic) behavior, i.e. viscosity increase with time when subjected to ... -
Effect of pressure fluctuations in long-term stability of unlined pressure shaft at Svandalsflona Hydropower project, Norway
(Chapter, 2019)The main design principle of unlined pressure tunnels/shafts in a hydropower scheme is to provide sufficient confinement (minor principal stress) to withstand the internal hydrostatic water pressure. Rock support is only ... -
Effectiveness of applied support in tunnels in plastically deformed rock mass - an analysis based on a tunnelling project from the Nepal Himalaya
(Chapter, 2014)Potentiality of plastic deformation in tunnels in the Himalayan rock mass is considerable. Tun-nel convergence and squeezing phenomena have therefore been serious issues for successful tunnelling in the region. Large tunnel ... -
Effects of Harsh Weather on Delayed Wireline Formation Fluid Sampling
(Springer Series in Geomechanics and Geoengineering;, Chapter, 2019)This paper discusses two cases where formation fluids were sampled after prolonged exposure to drilling fluid invasion. The long exposure occurred due to suspension of rig activities following the arrival of the Typhoon ... -
Electrokinetics Application in Concrete and Well Construction
(Chapter, 2020)Electrically induced or coupled transport processes including electrophoresis, electroosmosis and electromigration in solutions and porous media under an external electric field have been extensively studied and employed ... -
Engineering Geological Investigation and Design of Transition Zones in Unlined Pressure Tunnels
(Chapter, 2019)The transition zone, i.e. where the pressurized water enters the steel lined section of the waterway, is a key component of the entire tunnel system in any underground hydropower project utilizing unlined pressure tunnels. ... -
Engineering Geology in Hydropower Engineering
(Chapter, 2023)Norway has more than 100 years of experience in the design and construction of hydropower plants consisting waterway systems that included unlined pressure tunnels and shafts. The waterway systems are in general very long ... -
Enhancing Autonomous Systems’ Awareness: Conceptual Categorization of Anomalies by Temporal Change During Real-Time Operations
(Chapter, 2022)The Unmanned Autonomous Systems (UAS) are anticipated to have a permanent role in offshore operations, enhancing personnel, environmental, and asset safety. These systems can alert onshore operators of hazardous occurrences ... -
Experimental Studies of Stress Dependence,Static vs Dynamic behaviour and Mechanical Anisotropies of Shale
(Chapter, 2014)Laboratory data from controlled rock mechanical tests with various shales have been used to understand and quantify stress effects on wave velocities of relevance for 4D seismics, and to quantify the difference between ... -
Field testing of weak rock deformation in water tunnels: A practical review of the flatjack test
(Chapter, 2019)The flatjack test is normally used to measure the average normal stress at a rock surface and to evaluate the rock mass deformation modulus. The aim of this manuscript is to present a modified variant of the flatjack test ... -
FME HydroCen - Norsk storsatsning på vannkraft
(Chapter, 2018)Artikkelen beskriver aktiviteter og planer for Forskningsprogrammet HydroCen (Norwegian Research Centre for Hydropower Technology), som ble etablert ved NTNU i januar 2017 som et av åtte nye Forskningssentre for Miljøvennlig ...