Browsing Institutt for geovitenskap og petroleum by Document Types "Doctoral thesis"
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A Laboratory Approach to Investigating Wellbore Instability in Shale during Drilling
(Doctoral thesis at NTNU;2015:233, Doctoral thesis, 2015)Abstract: Over the past few years, laboratory efforts have been increasingly directed towards developing methods to understand more of the wellbore dynamics during drilling, particularly in weak shale. Hollow cylinder ... -
A petrophysical Evaluation of tidal heterolithic Deposits
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:131, Doctoral thesis, 2004)The main goal of this thesis, A petrophysical evaluation of tidal heterolithic deposits: application of a near wellbore model for reconciliation of scale dependent well data, is to give a better and less uncertain estimate ... -
A Study of the Ultrasonic Measurements for Logging Behind a Steel Pipe: Expanding the proessing to improve the differentiation between heavy fluids and light solids
(Doctoral theses at NTNU;2019:375, Doctoral thesis, 2020)In petroleum applications using acoustic wave theory, the most used practice can be found in borehole geophysical methods, where acoustic logging has long been the foremost source for cement evaluation. Due to stricter ... -
Acoustic emission measurements in petroleum-related rock mechanics
(Doktoravhandlinger ved NTNU, 1503-8181; 77, Doctoral thesis, 2002)Acoustic emission activity in rock has usually been studied in crystalline rock, which reflects that rock mechanics has also mostly been occupied with such rocks in relations to seismology, mining and tunneling. On the ... -
Alkali-aggregate reactions in concrete : study of the relationship between aggregate petrographic properties versus expansion tests
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:351, Doctoral thesis, 2012)Alkali-Aggregate Reactions (AAR) is a deterioration mechanism in concrete that affects numerous structures worldwide. The most widespread type of AAR is the Alkali-Silica Reactions (ASR), a chemical reaction between silica ... -
An Analytical Mathematical Theoretical Study of Single-Well Push-Pull ”Echo” Tests
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:122, Doctoral thesis, 2007)Analysis of stream-line-based formulations is exercised to develop a stream-line based semi-analytical model for the single-well push-pull test, taking into account natural ground-water drift. The model is employed to ... -
An experimental and multiscale numerical study of mechanical and tribological behavior of cemented tungsten carbides and hard rocks in percussive drilling
(Doctoral theses at NTNU;2016:284, Doctoral thesis, 2016)Presented research is about deep rotary-percussive drilling (RPD) in hard rock formations. RPD is recognized as an effective method for tunnel excavation and well boring in hard igneous rocks. Rock fragmentation and chipping ... -
An Experimental Investigation and Process Modeling of Multiphase Flow Through Multiple Restrictions
(Doctoral thesis at NTNU;2015:277, Doctoral thesis, 2015)A methodology for simultaneous estimation of multiphase flow rate and stream composition has been developed to be applied in a multiple restriction assembly composed of two orifice meters and a cage trim valve. These ... -
An Experimental Investigation of Enhanced Oil Recovery Mechanisms in Nanofluid Injection Process
(Doctoral thesis at NTNU;2016:37, Doctoral thesis, 2016)Nanotechnology is recently proposed to increase oil recovery in some literature. Nanoparticles, as part of nanotechnology, are chosen as novel enhanced oil recovery (EOR) agent. Compared with other chemical EOR agents, ... -
Analysis of Engineering Geological Uncertainties Related to Tunnelling in Himalayan Rock Mass Conditions
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:41, Doctoral thesis, 2006)The need for tunnelling in Nepal, as in the Himalayan region in general, is enormous, particularly for hydropower development. Due to active tectonic movement and dynamic monsoon, the rock mass in the Himalaya is relatively ... -
Analysis of modelled satellite magnetic data to explore lithospheric magnetization
(Doctoral theses at NTNU;2017:304, Doctoral thesis, 2017)The increasing availability of magnetic satellite measurements in addition to aeromagnetic data, requires new tools and concepts for interpretation and modelling. Realistic forward modelling requires a precise definition ... -
Analysis of Rock Support Performance for Tunnelling in Weakness Zones Containing Swelling Clay
(Doctoral Theses at NTNU, 1503-8181; 2012:12, Doctoral thesis, 2012)Weakness zones or faults containing swelling clay represent a challenging situation in hard rock tunnelling. When excavating in such zones, failures have occurred occasionally even though particular precautions have been ... -
Analysis of Stick-Slip Effects During Oil-Well Drilling
(Doctoral theses at NTNU;2017:127, Doctoral thesis, 2017)The drilling operation is a costly portion of the upstream petroleum industry. It is worth making efforts to reduce unwanted non-productive time (NPT), which is often induced by downhole problems during drilling. In this ... -
Anchorage performance of fully-encapsulated rock bolts under pull-and-shear loading
(Doctoral thesis at NTNU;2015:48, Doctoral thesis, 2015)This thesis aims to study the anchorage performance of rock bolts under pull-andshear loading conditions. Laboratory tests, an analytical solution and a numerical simulation are included. The research results can be ... -
Applicability of Reinforced Ribs om Sprayed Concrete in Sections of Poor Quality and Swelling Rock Mass
(Doctoral theses at NTNU;2018:314, Doctoral thesis, 2018)When excavating tunnels, reinforcement and support is required depending on the quality of the rock mass. In good quality rock mass, simple reinforcement such as sprayed concrete and rock bolts is usually adequate as ... -
Applicability of Unlined/Shotcrete Lined Pressure Tunnels for Hydropower Projects in the Himalaya
(Doctoral theses at NTNU;2018:357, Doctoral thesis, 2018)Nowadays, unlined or shotcrete lined pressure tunnels and shafts are used in hydropower projects worldwide. The prime requirements for these tunnels and shafts are that they should be economically attractive and should be ... -
Architecture, Morphometry and Development of Subaqueous Sediment Conduits
(Doctoral theses at NTNU;2021:75, Doctoral thesis, 2021)Canyons, channels, and gullies are incised features on the surface of the earth that act as subaqueous conduits for transferring sediment from source areas to basins. For several decades, these subaqueous sediment conduits ... -
Assessment of High Pressure Pre-Excavation Rock Mass Grouting in Norwegian Tunneling
(Doctoral theses at NTNU;2019:262, Doctoral thesis, 2019)Due to growth of the population in cities and limited space there is an increasing trend to move transportation systems, such as roads and railroads underground. Furthermore, Norway is a rugged country with deep fjords, ... -
Assessment of Undiscovered Mineral Resource Potential at the Northern Mid-Atlantic Ridge (MAR) and on the Norwegian Mainland: Method development and applications
(Doctoral theses at NTNU;2019:137, Doctoral thesis, 2019)Marine mineral resources, such as seafloor massive sulfides (SMS), may address future needs in raw materials for nations aiming to sustain industrial and economic development. Past exploration of these seabed resources, ... -
Assessment on the Decisive Parameters for Open Pit Slopes – A contribution based on a mine in hard rock environment
(Doctoral theses at NTNU;2018:35, Doctoral thesis, 2018)Rock slope stability has been one of the major operational and safety challenges in the open pit mines throughout the world. Steeper slope angles provide a higher revenue and less waste material. Gentle slope angles are ...