Browsing UiS Brage by Author "Andersen, Pål Østebø"
Now showing items 1-20 of 64
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Analytical modeling and correction of steady state relative permeability experiments with capillary end effects – An improved intercept method, scaling and general capillary numbers
Andersen, Pål Østebø (Peer reviewed; Journal article, 2021)Steady state relative permeability experiments are performed by co-injection of two fluids through core plug samples. Effective relative permeabilities can be calculated from the stabilized pressure drop using Darcy’s law ... -
Analytical modeling of steady state relative permeability experiments with end effects – An improved intercept method, scaling and general capillary numbers
Andersen, Pål Østebø (Peer reviewed; Journal article, 2021)Steady state relative permeability experiments are performed by co-injection of two fluids through core plug samples. Effective relative permeabilities can be calculated from the stabilized pressure drop using Darcy’s law ... -
Analytical solutions for forced and spontaneous imbibition accounting for viscous coupling
Andersen, Pål Østebø; Kjos Nesvik, Eirik; Standnes, Dag Chun (Journal article; Peer reviewed, 2019-11-22)Fluid-fluid momentum transfer can cause higher flow resistance when fluids flow in opposite directions as compared to the same direction. Conventional modelling of flow in porous media using simple, saturation dependent relative ... -
Analytical solutions for forced and spontaneous imbibition accounting for viscous coupling
Nesvik, Eirik Kjos (Masteroppgave/UIS-TN-IER/2019;, Master thesis, 2019-06)Theoretical and experimental work has shown that fluid mobilities can depend on flow configuration, and are typically lower when fluids flow in opposite directions as compared to when they flow in the same direction. Such ... -
Automatic evaluation of wavelength spectra from quartz by means of machine learning
Kvandal, Ove (Master thesis, 2022)I have for this thesis worked on automating the steps in evaluating wavelength spectra from quartz. To do this I have applied different machine learning algorithms suitable to the automation requirement at each step, and ... -
Causal Inference of Interwell Connectivity
Worum, Joachim Alexander (Master thesis, 2021)Interwell connectivity is a measure of the degree to which information is translated between wells in a reservoir. The translated information may include changes in pressure, fluid flow, or other physical properties. This ... -
Characteristic forced and spontaneous imbibition behavior in strongly water-wet sandstones based on experiments and simulation
Andersen, Pål Østebø; Salomonsen, Liva; Sleveland, Dagfinn Søndenaa (Peer reviewed; Journal article, 2022-05)Forced and spontaneous imbibition of water is performed to displace oil from strongly water-wet Gray Berea (~130 mD) and Bentheimer (~1900 mD) sandstone core plugs. Two nonpolar oils (n-heptane and Marcol-82) were used as ... -
Characterization and capillary pressure curve estimation of clayey-silt sediment in gas hydrate reservoirs of the South China Sea
Xia, Yuxuan; Xu, Sai; Lu, Cheng; Andersen, Pål Østebø; Cai, Jianchao (Peer reviewed; Journal article, 2023)The capillary pressure curve is a crucial basis for studying the pore structure and multiphase flow characteristics in oil and gas reservoirs. Due to the loose and unconsolidated nature of the clayey-silt sediment of natural ... -
CO2 Injection in Shales for CCUS
Shahab, Armin (Masteroppgave/UIS-TN-IEP/2020;, Master thesis, 2020-08-15)Shale gas production has had great impact on energy supply and fuel prices. Due to low permeability and reservoir complexity the recovery factors are still very low. A promising alternative to pressure depletion is injection ... -
Comparison of intercept methods for correction of steady state relative permeability experiments for capillary end effects
Andersen, Pål Østebø (Peer reviewed; Journal article, 2022)Steady-state relative permeability experiments are performed by coinjection of two fluids through core plug samples. The relative permeabilities can be calculated using Darcy’s law from the stabilized pressure drop and ... -
Core Flooding for Analysis of Capillary End Effect and Multiphase Flow Properties
Nainggolan, Citra Kirana Lestari (Masteroppgave/UIS-TN-IEP/2018;, Master thesis, 2018-07)The non-uniform saturations along the core is called capillary end effect. The capillary end effect is caused by the condition that the capillary pressure is zero outside the core. The presence of capillary end effect is ... -
Early and Late Time Analytical Solutions for Co-current Spontaneous Imbibition and Generalized Scaling
Andersen, Pål Østebø (Peer reviewed; Journal article, 2020)We propose an explicit analytical solution for 1D cocurrent (COC) spontaneous imbibition (SI) in which a core is exposed to water (inlet) and oil (outlet). The system is described using an advection-capillary diffusion ... -
Early- and Late-Time Prediction of Counter-Current Spontaneous Imbibition, Scaling Analysis and Estimation of the Capillary Diffusion Coefficient
Andersen, Pål Østebø (Peer reviewed; Journal article, 2023-03)Solutions are investigated for 1D linear counter-current spontaneous imbibition (COUSI). It is shown theoretically that all COUSI scaled solutions depend only on a normalized coefficient Λn (Sn) with mean 1 and no other ... -
Effect of Wettability on Waterflooding and Relative Permeability at Slightly Water-Wet Conditions
Wathne, Agnes Kahlbom (Masteroppgave/UIS-TN-IER/2019;, Master thesis, 2019-06-14)The wettability of a porous system is of high importance when waterflood behavior and relative permeability are investigated, because both will be strongly affected. Adsorption of polar organic components (POC) are responsible ... -
Effect of Wettability on Waterflooding and Relative Rermeability at Medium Water-Wet Conditions.
Harestad, Amalie (Masteroppgave/UIS-TN-IER/2019;, Master thesis, 2019-06-15)This project contributes with experimental measurement that could increase our understanding on how relative permeability is affected by wettability during an oil recovery process. Wettability has significant attention ... -
Estimation of Adsorption Capacity of CO2, CH4, and their Binary Mixtures in Quidam Shale using LSSVM: Application in CO2 Enhanced Shale Gas Recovery and CO2 Storage
Bemani, Amin; Baghban, Alireza; Mohammadi, Amir; Andersen, Pål Østebø (Journal article; Peer reviewed, 2020-02)Carbon dioxide enhanced shale gas recovery depends strongly on adsorption properties of carbon dioxide and methane. In this work, Least Squares Support Vector Machine (LSSVM) optimized by Particle Swarm Optimization, has ... -
Experimental Analysis of Oil Recovery in Core Samples
Salomonsen, Liva (Bachelor thesis, 2021)An experimental analysis of oil recovery in core samples during spontaneous and forced imbibition have been performed. Grey Berea sandstone cores with a permeability around 120 mD have been used in the experiments. The ... -
Hydrogen diffusion into caprock: A semi-analytical solution and a hydrogen loss criterion
Ghaedi, Mojtaba; Andersen, Pål Østebø; Gholami, Raoof (Peer reviewed; Journal article, 2023)Depleted gas reservoirs can provide a gigaton capacity and the necessary infrastructure for large scale hydrogen storage. Therefore, underground storage of hydrogen in these geological formations is considered a valuable ... -
An Improved Approach in Estimating Gas Permeability for Tight Reservoir Rocks.
Boboye, Temidayo Olayinka (Masteroppgave/UIS-TN-IEP/2020;, Master thesis, 2020-12-15)The impact of the permeability on ultra-tight porous media influences flow behaviour inside the media. The unconventional reservoir gas permeability significantly impacts rock property estimation crucial to unconventional ... -
The Influence of Adsorption Layer Thickness and Pore Geometry on Gas Production from Tight Compressible Shales
Abolghasemi, Erfan; Andersen, Pål Østebø (Peer reviewed; Journal article, 2021-12)In tight shales, gas is stored in both free and adsorbed form. A one-dimensional model is derived for shale gas production by pressure depletion where the adsorbed layer thickness is of similar magnitude as the pore radius ...