Browsing Institutt for geovitenskap og petroleum by Title
Now showing items 41-60 of 2540
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A Comparison of Analytical and Experimental Procedures to Verify a Lumped Drill String Element Model
(Master thesis, 2016)A study of axial vibrations in a vertical drill string is conducted using a spring-mass-damper model with n coupled elements. The main motivation behind this is to describe the axial vibrations using a simple mathematical ... -
A comparison of the deep structure of the Mid-Norwegian margin and the South China Sea, based on seismic interpretation
(Master thesis, 2020)Rifted basins are now an important type of basin that produces petroleum, especially in Atlantic margin. The study of rifting process is important for the petroleum prospecting. In this study, we focus on the Mid-Norwegian ... -
A comprehensive investigation on the performance of durian rind as a lost circulation material in water based drilling mud
(Journal article; Peer reviewed, 2018)Oil and gas operators worldwide are expecting service companies to deliver integrated techniques to minimize, if not prevent, drilling problems. Drilling fluids perform vital functions to ensure the success of drilling ... -
A discussion of continental lithospheric stretching models and comparison with interpreted 2D seismic data of the Viking Graben of the northern North Sea
(Master thesis, 2019)Riftmarginer markerer overgangen fra et kontinent til hav, og inneholder en oversikt over dets rifthistorie i arkitekturen. Ikke all rifter vil imidlertid utvikles til stadiet for skorpeseparering, men stanse før de når ... -
A dynamic analysis of in-situ stress state at the Upper Tamakoshi Hydroelectric Project area
(Journal article; Peer reviewed, 2018)The in-situ stress condition in the rock mass is influenced by both tectonic and geological environment such as faulting and shearing in the rock mass. This influence is of considerable magnitude in the Himalayan region ... -
A dynamic stress state analysis at the pressure tunnel of Upper Tamakoshi HPP, Nepal
(Chapter, 2018)In theory, in-situ stress state of an area of concern is mainly governed by gravity-induced stress, tectonic ac-tivity and topographic condition of that area. The tectonic and geological environment such as faulting and ... -
A FEASABILITY STUDY OF EXTENDED REACH WELL, VARG 15/12-A-11 A
(Master thesis, 2011)This report is an analysis of an extended reach drilling (ERD) well planned to be drilled from Varg A to the Rev East reservoir in the North Sea. It is a continuation on the torque and drag (T&D) analysis “Torque and Drag ... -
A flexural isostasy model for the Pleistocene evolution of the Barents Sea bathymetry
(Journal article; Peer reviewed, 2017)The topographic relief of the Barents Sea was subjected to major changes during the past 1.5 million years mostly due to sediment redistribution driven by glacial activity. This paper addresses the problem of Pleistocene ... -
A Geochemical and Petrological Analysis of the Klemetsaunet Rhyodacite, Central Norwegian Caledonides; Unraveling the Rock's Origin, Mineral Alteration, and Deformation Patterns.
(Master thesis, 2023)Klemetsaunet ryodacitten er en av tre felsiske intrusjoner som ble dannet i oseansk skorpe for om lag 481 ± 5 millioner år siden. Studieområdet ligger i de nordlige delene av Bymarka-ofiolitten i Trondheim, Norge, og er ... -
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 low frequency deghosting method: Analysis and numerical tests
(Journal article; Peer reviewed, 2017)The low-frequency component of seismic data can be beneficial for several reasons: improved signal penetration into the earth, enhanced resolution, and better constrained inversion results. We have developed a detailed ... -
A Lumped Multi-element Model for Analysing the Effects of the Top Drive Mass and the Drill Line Elasticity
(Master thesis, 2021)Heisespillet i boreta ̊rnet har enda ikke blitt inkludert i de eksisterende multi-element mod- ellene for aksielle vibrasjoner av borestrengen. Eksperimentelle resultater tyder derimot pa ̊ at heisespillet kan ha en effekt ... -
A Machine Learning Approach for Net Pay Estimation from Borehole Image Logs
(Master thesis, 2020)In the realm of hydrocarbon exploration, net pay estimation is essential for the economic calculation and valuation of the field. By definition, net pay is the reservoir interval with economically producible hydrocarbons ... -
A mineralogical-, mineral chemical- and spatial characterization of the Lomli iron deposit
(Master thesis, 2019)Lomliforekomsten er en Neoproterozoisk magnetitt-apatitt-mineralisering som befinner seg i Storforshei, der Rana Gruber for tiden driver gruvedrift på jernoksider. Som en del av Rana Grubers ønske om å utvide malmdatabasen ... -
A neural network approach for spatial variation assessment – A nepheline syenite case study
(Journal article; Peer reviewed, 2020)The present geometallurgical study shows the application of a machine-learning methodology to the prediction of material properties from the Nabbaren nepheline syenite deposit in Norway. The approach used in this study ... -
A new approach to dynamic barite sag analysis on typical Field oil-based drilling fluid
(Chapter, 2019)Laboratory and field experiences record that sagging of weighting agents such as barite in drilling fluids is often worse in dynamic conditions, e.g. pumping, tripping or drill pipe rotation, than in static conditions. ... -
A new laboratory apparatus for the measurement of seismic dispersion under deviatoric stress conditions
(Journal article; Peer reviewed, 2016)A better understanding of seismic dispersion and attenuation of acoustic waves in rocks is important for quantitative interpretation of seismic data, as well as for relating seismic data, sonic-log data, and ultrasonic ... -
A novel model-based scheme for kick and loss mitigation during drilling
(Journal article; Peer reviewed, 2013)A model-based in-/out-flux detection scheme for managed pressure drilling is presented. We apply a globally exponentially stable adaptive observer which estimates the unknown states and parameters of the hydraulic system ... -
A Novel Tool for Cement Evaluation
(Master thesis, 2017)The annular casing cement is an important part of the well barrier throughout the life cycle of a well. With the increasing number of plug and abandonment (P&A) operations, increased attention is now given to annular cement ... -
A Numerical and Analytical Investigation of the Relation Between Transport Properties and Grain Size Distribution
(Master thesis, 2018)There have been many and varied attempts describing the relation between transport and rock properties for porous materials, including the work of Kozeny (1927), Carman (1938), and Berg (1970). Common features of these ...