Blar i Vitenskapelige publikasjoner (TN-IER) på forfatter "Andersen, Pål Østebø"
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Interpretation of 1-D Counter-Current Spontaneous Imbibition Processes Using Microscopic Diffusion Theory and a Modified Buckley – Leverett Approach
Standnes, Dag Chun; Andersen, Pål Østebø; Papatzacos, Paul Georg; Skjæveland, Svein Magne (Peer reviewed; Journal article, 2020-04)This paper presents a new convenient and easy-to-use method to analyze and calculate measurable quantities in 1-D counter-current (COUC) spontaneous imbibition (SI) processes. Cumulative water imbibed vs time can be ... -
Mineralogy and geochemistry of reservoir and non-reservoir chalk from the Norwegian continental shelf
Kallesten, Emanuela Iedidia; Zimmermann, Udo; Madland, Merete Vadla; Bertolino, Silvana R.A.; Omdal, Edvard; Andersen, Pål Østebø (Peer reviewed; Journal article, 2021-05)A first and detailed study of the geochemistry and mineralogy characterizing the North Sea reservoir and non-reservoir chalk is provided in this work. The study is based on 185 cores from exploration and development wells ... -
Modeling Viscosity of CO2 at High Temperature and Pressure Conditions
Amar, Menad Nait; Ghriga, Mohammed Abdelfatah; Ouaer, Hocine; Ben Seghier, Mohamed el Amine; Pham, Binh Thai; Andersen, Pål Østebø (Peer reviewed; Journal article, 2020-03)The present work aims at applying Machine Learning approaches to predict CO2 viscosity at different thermodynamical conditions. Various data-driven techniques including multilayer perceptron (MLP), gene expression programming ... -
Modelling of creep compacting outcrop chalks injected with Ca-Mg-Na-Cl brines at reservoir conditions
Andersen, Pål Østebø; Berawala, Dhruvit Satishchandra (Peer reviewed; Journal article, 2019)Numerical and analytical 1D solutions are presented to interpret the link between geochemical alterations and creep compaction (compaction under constant effective stress) in chalk cores. Chemically reactive flow enhancing ... -
Prediction of Oil Recovery Factor in Stratified Reservoirs after Immiscible Water-Alternating-Gas Injection based on PSO-, GSA-, GWO-, and GA-LSSVM
Andersen, Pål Østebø; Nygård, Jan Inge; Kengessova, Aizhan (Peer reviewed; Journal article, 2022-01)In this study, we solve the challenge of predicting oil recovery factor (RF) in layered heterogeneous reservoirs after 1.5 pore volumes of water-, gas- or water-alternating-gas (WAG) injection. A dataset of ~2500 reservoir ... -
Prediction of Oil Recovery Factor in Stratified Reservoirs after Immiscible Water-Alternating-Gas Injection based on PSO-, GSA-, GWO-, and GA-LSSVM
Andersen, Pål Østebø; Nygård, Jan Inge; Kengessova, Aizhan (Peer reviewed; Journal article, 2022)In this study, we solve the challenge of predicting oil recovery factor (RF) in layered heterogeneous reservoirs after 1.5 pore volumes of water-, gas- or water-alternating-gas (WAG) injection. A dataset of ~2500 reservoir ... -
Prediction of permeability of tight sandstones from mercury injection capillary pressure tests assisted by a machine-learning approach
Abbasi, Jassem; Zhao, Jiuyu; Ahmed, Sameer; Jiao, Liang; Andersen, Pål Østebø; Cai, Jianchao (Peer reviewed; Journal article, 2022) -
Reaction kinetics determined from core flooding and steady state principles for Stevns Klint and Kansas chalk injected with MgCl2 brine at reservoir temperature
Andersen, Pål Østebø; Korsnes, Reidar Inge; Olsen, Andre Tvedt; Bukkholm, Erik (Peer reviewed; Journal article, 2022)A methodology is presented for determining reaction kinetics from core flooding: A core is flooded with reactive brine at different compositions with injection rates varied systematically. Each combination is performed ... -
Rigorous Connectionist Models to Predict Carbon Dioxide Solubility in Various Ionic Liquids
Ouaer, Hocine; Hosseini, Amir Hossein; Amar, Menad Nait; Ben Seghier, Mohamed El Amine; Ghriga, Mohammed Abdelfatah; Nabipour, Narjes; Andersen, Pål Østebø; Mosavi, Amir; Shamshirband, Shahaboddin (Journal article; Peer reviewed, 2020-01)Estimating the solubility of carbon dioxide in ionic liquids, using reliable models, is of paramount importance from both environmental and economic points of view. In this regard, the current research aims at evaluating ... -
Simulation of immiscible WAG injection in a stratified reservoir -- performance characterization using a new dimensionless number
Nygård, Jan Inge; Andersen, Pål Østebø (Peer reviewed; Journal article, 2019)Water alternating gas (WAG) is a well‐established enhanced‐oil‐recovery process where gas and water are injected in alternating fashion. Good volumetric sweep is achieved as water and gas target both the oil residing in ... -
Simulation study of wettability alteration enhanced oil recovery during co-current spontaneous imbibition
Andersen, Pål Østebø; Ahmed, Sameer (Peer reviewed; Journal article, 2020-09)Naturally fractured reservoirs are highly dependent on capillary forces to recover hydrocarbons during water injection. Water can spontaneously imbibe and expel oil if positive capillary forces exist; purely counter-current ... -
Simulation study of wettability alteration enhanced oil recovery during co-current spontaneous imbibition
Andersen, Pål Østebø; Ahmed, Sameer (Peer reviewed; Journal article, 2020)Naturally fractured reservoirs are highly dependent on capillary forces to recover hydrocarbons during water injection. Water can spontaneously imbibe and expel oil if positive capillary forces exist; purely counter-current ... -
Steady State Gas Flow from Tight Shale Matrix Subject to Water Blocking
Andersen, Pål Østebø (Peer reviewed; Journal article, 2021)This work studies 1D steady-state flow of gas from compressible shale matrix subject to water blocking toward a neighboring fracture. Water blocking is a capillary end effect causing wetting phase (e.g., water) to accumulate ...