Institutt for geovitenskap og petroleum
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Minimizing Risk by Determining A Safe Mud Weight Window for Offshore Wellbore Construction
(Journal article; Peer reviewed, 2020)Increased requirements for uncertainty analysis have caused a shift in sensitivity assessment, from a deterministic approach to a stochastic process. To ensure wellbore integrity, it’s essential to conduct breakout and ... -
Simulation of fluid flow through real microannuli geometries
(Journal article; Peer reviewed, 2020)Debonding of well cement towards casing or rock, i.e. microannuli formation, is a typical failure mode of cement barriers. Consequently, such microannuli may act as leak paths during leakages of downhole fluids such as ... -
Fluid Heterogeneity in Tight Unconventional Reservoirs
(Doctoral theses at NTNU;2020:270, Doctoral thesis, 2020)This thesis deals primarily with layer-wise fluid heterogeneity in tight unconventional reservoirs. The industry has almost exclusively assumed that the fluid system within a well-box, i.e. contributing production to a ... -
A framework for evaluating deep sea mining systems for seafloor ma ssive sul phides deposits
(Doctoral theses at NTNU;2020:280, Doctoral thesis, 2020)Loki’s Castle, a SMS site of interest located in the Norwegian jurisdiction, was used to illustrate the established framework. The established economic block model was used to support a sensitivity analysis which shows ... -
Polymer-functionalized silica nanoparticles for improving water flood sweep efficiency in Berea sandstones
(Peer reviewed; Journal article, 2020)Extraction of oil trapped after primary and secondary oil production stages still poses many challenges in the oil industry. Therefore, innovative enhanced oil recovery (EOR) technologies are required to run the production ... -
Applying hybrid support vector regression and genetic algorithm to water alternating CO2 gas EOR
(Peer reviewed; Journal article, 2020)Water alternating CO2 gas injection (WAG CO2) is one of the most promising enhanced oil recovery techniques. The optimization of this process requires performing many time‐consuming simulations. In this paper, an intelligent ... -
Supradetachment to rift basin transition recorded in continental to marine deposition; Paleogene Bandar Jissah Basin, NE Oman
(Peer reviewed; Journal article, 2020)A transition from supradetachment to rift basin signature is recorded in the ~1,500 m thick succession of continental to shallow marine conglomerates, mixed carbonate‐siliciclastic shallow marine sediments and carbonate ... -
A material balance model based on mass conservation in the producing layer and gas and water injection in non-communicating gas-cap and aquifer layers
(Peer reviewed; Journal article, 2021)In this work a material balance model has been developed, expanding the previous work of Borthne (1986), based on: the modified black-oil model, mass-conservation in the producing layer, gas and water injection in ... -
The effect of wettability and flow rate on oil displacement using polymer-coated silica nanoparticles: A microfluidic study
(Peer reviewed; Journal article, 2020)Polymer-coated silica nanoparticles (PSiNPs) have been experimentally investigated in core- and micro-scale studies for enhanced oil recovery (EOR). Wettability and flow rate have a considerable effect on oil displacement ... -
Long Wire Electromagnetic Measurements (Turam EM)
(Chapter, 2020)In Scandinavia, EM measurements have traditionally been popular in sulfide ore exploration. The EM methods using a stationary cable loop or a long wire on the ground surface were called Turam. The wire was grounded by ... -
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. ... -
Pore throat structure characteristics and its effect on flow behavior in Gaotaizi tight siltstone reservoir, Northern Songliao Basin
(Peer reviewed; Journal article, 2020)The features of pore and throat structure of an unconventional reservoir are very complex due to multiscale pore-throat size and various pore types and thus hard to characterize. In this study, thin sections, field emission ... -
Modified discrete element method (MDEM) as a numerical tool for cement sheath integrity in wells
(Peer reviewed; Journal article, 2021)Cement sheaths undergo extreme loading conditions in wells during subsurface operations. A damaged cement sheath may lead to fluid communication between different formation layers and fluid migration up to the surface, ... -
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 ... -
Offset dependence of overburden time-shifts from ultrasonic data
(Journal article; Peer reviewed, 2020)Depletion or injection into a reservoir implies stress changes and strains in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. To better understand ... -
Use of Tracer Particles for Tracking Fluid Interfaces in Primary Cementing
(Chapter, 2019)In this study, a new approach for detailed tracking of the interface between well fluid and cement by using particles is investigated. This can improve the quality of annular cementing of CO2 wells and thus the storage ... -
Offset-Dependent Overburden Time-Shifts from Ultrasonic Data
(Chapter, 2019)Depletion or injection into a reservoir implies stress and strain changes in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. We have measured ... -
Permian-Triassic Depositional Systems in the Norwegian Sea Areas
(Doctoral theses at NTNU;2020:195, Doctoral thesis, 2020)Upper Permian deposits from the eastern margin of the Helgeland Basin, offshore Norway, are known to contain two organic-carbon-rich (OCR) intervals within the Lower Turbidite Unit. These intervals were so far not proven ... -
Application of Low-Salinity Waterflooding in Carbonate Cores: A Geochemical Modeling Study
(Peer reviewed; Journal article, 2020)Waterflooding is the most widely applied improved oil recovery technique. Recently, there has been growing interest in the chemistry and ionic composition of the injected water. Low-salinity waterflooding (LSWF) is a ... -
Novel reagent system in metal sulphide flotation
(Doctoral theses at NTNU;2020:214, Doctoral thesis, 2020)
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