Browsing NTNU Open by Author "Holt, Rune Martin"
Now showing items 1-20 of 52
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2D Vertical Effective Stress Modeling of the Tor Area
Berg, Sabrina (Master thesis, 2012)The oil industry has been exploring and drilling for hydrocarbons for decades, and on the Norwegian Continental Shelf (NCS), most of the previously discovered big fields are in their ending phase. The remaining reserves ... -
A new laboratory apparatus for the measurement of seismic dispersion under deviatoric stress conditions
Szewczyk, Dawid; Bauer, Andreas; Holt, Rune Martin (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 Study of the Ultrasonic Measurements for Logging Behind a Steel Pipe: Expanding the proessing to improve the differentiation between heavy fluids and light solids
Sirevaag, Tore Lie (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 ... -
An analysis of tensile strength, fracture initiation and propagation in anisotropic rock (gas shale) using Brazilian tests equipped with high speed video and acoustic emission
Simpson, Nathaniel Denis John (Master thesis, 2013)This study attempts to further our knowledge of fracture behaviour by establishing an experimental system that links tensile strength, fracture initiation and propagation of an anisotropic rock (Mancos Shale) using an ... -
Anisotropic poroelasticity – Does it apply to shale?
Holt, Rune Martin; Bakk, Audun; Bauer, Andreas (Journal article; Peer reviewed, 2018)Shale plays an important role as cap rock above oil and gas reservoirs and above e.g. CO2 storage sites, as well as being source and reservoir rock in development of so-called unconventional reserves. Shale anisotropy needs ... -
Anisotropy in a very fine grained sand: A comparison between sand and kaolinite
Rørheim, Stian (Master thesis, 2015)Rock mechanics and geophysics are intertwined due to elastic waves being mechanical disturbances propagating through a material, whereas determination of the elastic properties is the alpha and omega in the field of rock ... -
Borehole Stability: Comparing the Deviation Sensibility of Different Failure Criteria
Åstrand, Gustaf Johan (Master thesis, 2015)During drilling the down-hole pressure has to be sufficient enough to prevent collapse of the wellbore, while at the same time it cannot exceed the fracture limit. Borehole failure can lead to a stuck pipe situation which ... -
Bounds of elastic parameters characterizing transversely isotropic media: Application to shales
Holt, Rune Martin (Journal article; Peer reviewed, 2016)Several rocks, and in particular shales, are often described as transversely isotropic (TI) materials. Geophysical data coverage does not always permit reliable determination of all five elastic parameters, neither in ... -
CO2 Sequestration: The effect of carbonate dissolution on reservoir rock integrity.
Eide, Kristian Engen (Master thesis, 2012)Since the environmental focus only becomes stronger and stronger in today’s society, industries like the oil and gas sector face some difficult challenges. Being the primary industry for CO2 production in the world requires ... -
Comparing mechanical and ultrasonic behaviour of a brittle and a ductile shale: Relevance to prediction of borehole stability and verification of shale barriers
Holt, Rune Martin; Larsen, Idar; Fjær, Erling; Stenebråten, Jørn (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, ... -
Contribution of Rock Physics Laboratory Tests and Modelling to Improving Uplift Estimates
Torset, Sondre; Duffaut, Kenneth; Holt, Rune Martin (Chapter, 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 ... -
Contribution of Rock Physics Laboratory Tests and Modelling to Improving Uplift Estimates
Torset, Sondre; Duffaut, Kenneth; Holt, Rune Martin (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 ... -
Drilling in geomechanically stressed formations over and adjacent to salt domes.
Vedøy, Rune (Master thesis, 2015)This thesis is in two parts: The first part is a literature study with the intent of identifying the general behavior of stress perturbations related to some standard, often seen, salt geometries. The second part is an ... -
Experimental Studies of Stress Dependence,Static vs Dynamic behaviour and Mechanical Anisotropies of Shale
Holt, Rune Martin; Bakk, Audun; Bauer, Andreas; Fjær, Erling; Stenebråten, Jørn (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 ... -
Experimental Study of Direct Tensile Strength in Sedimentary Rocks
Jensen, Stina Stokmo (Master thesis, 2016)Tensile strength is an important parameter in rock mechanics and is amongst other things used as a criterion for initiation and propagation of fractures in hydraulic fracture modeling. The tensile strengths are determined ... -
Experimental Study of Fracture Toughness in Sedimentary Rocks
Brevik, Niklas Øystad (Master thesis, 2016)This master thesis details the determination of mode I (tensile) fracture toughness, KIC, using the International Society of Rock Mechanics (ISRM) Chevron Bend (CB) method on three sedimentary rock types. Fracture toughness ... -
Experimental Study of Stress Dependent P-and S-wave Velocities in Both Dry and Saturated Sand
Qadar, Kaleem (Master thesis, 2014)Vp/Vs ratio is known as lithological and fluid prediction method as well as key part of AVO analysis. This diploma thesis is based on the based on the theoretical and mainly experimental studies to evaluate the behavior ... -
Formation of a shale barrier using numerical and analytical methods
Skomedal, Øyvind (Master thesis, 2016)The petroleum industry is looking for less expensive solutions regarding Plug & Abandonment. Earlier studies have shown incidents that shale formation around a well sometimes deforms and establishes sufficient seal around ... -
Fracture Assessment of Quasi-brittle Rock Simulated by Modified Discrete Element Method
Gheibi, Sohrab; Holt, Rune Martin (Journal article; Peer reviewed, 2020)New developments of an in-house hybrid code, named Modified Discrete Element Method (MDEM) are presented in the paper. The new developments are on the treatment of pre-existing and propagating fractures in quasi-brittle ... -
Frequency-dependent wave velocities in sediments and sedimentary rocks: Laboratory measurements and evidences
Bauer, Andreas; Bhuiyan, Mohammad Hossain; Fjær, Erling; Holt, Rune Martin; Lozovyi, Serhii; Pohl, Mathias; Szewczyk, Dawid (Journal article; Peer reviewed, 2016)The pioneering work of Mike Batzle and his colleagues has provided a fundamental understanding of mechanisms behind dispersion and attenuation of elastic waves in fluid-saturated rocks. It also has made way for a realization ...