Blar i UiS Brage på forfatter "Madland, Merete Vadla"
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An Analytical TOOLBOX for the Characterization of Chalks and Other Fine-Grained Rock Types within Enhanced Oil Recovery Research and Its Application—A Guideline
Zimmermann, Udo; Minde, Mona Wetrhus; Madland, Merete Vadla; Bredal, Tine Vigdel (Peer reviewed; Journal article, 2022-06)Analyses of fine-grained rocks like shales, cherts, and specifically chalk are challenging with regards to spatial resolution. We propose a “toolbox” to understand mineralogical alteration in chalk, especially those induced ... -
Effect of Initial Wettability on Rock Mechanics and Oil Recovery: Comparative Study on Outcrop Chalks
Sachdeva, Jaspreet Singh; Nermoen, Anders; Korsnes, Reidar Inge; Madland, Merete Vadla (Peer reviewed; Journal article, 2020)Brines containing surface-active divalent ions such as Ca2+, Mg2+ and SO42− impact the stiffness, strength and time-dependent deformation of water wet Mons outcrop chalk. This study documents how stiffness and strength of ... -
Evaluation of the compositional changes during flooding of reactive fluids using scanning electron microscopy, nano-secondary ion mass spectrometry, x-ray diffraction, and whole-rock geochemistry
Zimmermann, Udo; Madland, Merete Vadla; Nermoen, Anders; Hildebrand-Habel, Tania; Bertolino, Silvana A.R.; Hiort, Aksel; Korsnes, Reidar; Audinot, Jean-Nicolas; Grysan, Patrick (Journal article; Peer reviewed, 2015-05)Outcrop chalk of late Campanian age (Gulpen Formation) from Liège (Belgium) was flooded with MgCl2 in a triaxial cell for 516 days under reservoir conditions to understand how the non-equilibrium nature of the fluids altered ... -
Evolution of wetting index over time in mixed wet Kansas chalk using triaxial cells
Muriel, Herman (Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06)Magnesium chloride effects have been widely studied in short and long-term core flooding experiments through outcrop chalk cores. Three main changes are induced by this reactive brine: ion exchange, dissolution of calcite ... -
High-Resolution Topographic and Chemical Surface Imaging of Chalk for Oil Recovery Improvement Applications
Bredal, Tine Vigdel; Zimmermann, Udo; Madland, Merete Vadla; Minde, Mona Wetrhus; Ost, Alexander D.; Wirtz, Tom; Audinot, Jean-Nicolas; Korsnes, Reidar Inge (Peer reviewed; Journal article, 2022-03)Chalk is a very fine-grained carbonate and can accommodate high porosity which is a key characteristic for high-quality hydrocarbon reservoirs. A standard procedure within Improved Oil Recovery (IOR) is seawater-injection ... -
Incorporating electrostatic effects into the effective stress relation — Insights from chalk experiments
Nermoen, Anders; Korsnes, Reidar Inge; Storm, Eirik V.; Stødle, Trond; Madland, Merete Vadla; Fabricius, Ida Lykke (Journal article; Peer reviewed, 2018-01)Which forces are responsible for holding highly porous chalks together? We use the effective stress to quantify the electrostatic effects around particle contacts originating from the adsorption of ions onto charged mineral ... -
A laboratory scale approach to wettability restoration in chalk core samples
Sachdeva, Jaspreet Singh; Sripal, Edison A.; Nermoen, Anders; Korsnes, Reidar Inge; Madland, Merete Vadla; James, Lesley A. (Peer reviewed; Journal article, 2019)Wettability in chalk has been studied comprehensively to understand fluid flow mechanisms impacting coreflooding experiments. Wettability becomes paramount in understanding the parameters influencing chalk-fluid interactions. ... -
Mechanical and physical behavior of high-porosity chalks exposed to chemical perturbation
Megawati, Megawati; Madland, Merete Vadla; Hiort, Aksel (Journal article; Peer reviewed, 2015-09)Extensive study on the effect of dissolution–precipitation on mechanical behavior of various high-porosity outcrop chalks (Liége, Aalborg, Kansas, Stevns Klint, and Mons) flooded with simplified aqueous chemistry at 130 ... -
Mineral replacement in long-term flooded porous carbonate rocks
Minde, Mona Wetrhus; Zimmermann, Udo; Madland, Merete Vadla; Korsnes, Reidar Inge; Schultz, Bernhard; Gilbricht, Sabine (Peer reviewed; Journal article, 2019-09)This study reports mineralogical and physical property changes linked to geo-chemical alterations processes during three ultra-long-term tri-axial tests on outcrop-chalk from Liège (Belgium). The test core plugs were flooded ... -
Mineral Replacements in Flooding Experiments Linked to Enhanced Oil Recovery in Chalk
Minde, Mona Wetrhus (PhD thesis UiS;, Doctoral thesis, 2018-11)Seawater injection into chalk-reservoirs on the Norwegian Continental Shelf has increased the oil recovery and reduced seabed subsidence. In the researchfield of Improved Oil Recovery (IOR) the effects of injection of ... -
Mineralogical alterations in calcite powder flooded with MgCl2 to study Enhanced Oil Recovery (EOR) mechanisms at pore scale
Minde, Mona Wetrhus; Madland, Merete Vadla; Zimmermann, Udo; Egeland, Nina; Korsnes, Reidar Inge; Nakamura, Eizo; Kobayashi, Katsura; Ota, Tsutomu (Peer reviewed; Journal article, 2019)Seawater injection into chalk-reservoirs on the Norwegian Continental Shelf has increased the oil recovery and reduced seabed subsidence, but not eliminated it. Therefore, understanding rock–fluid interactions is paramount ... -
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 ... -
Permeability evolution in chalk linked to stress and thermochemical aspects of North Sea reservoir conditions
Kallesten, Emanuela I. (PhD thesis UiS;564, Doctoral thesis, 2020-12)The project was initiated by The National IOR Centre of Norway within the University of Stavanger and it aligns with the overall goal of the centre to improve oil recovery on the Norwegian Continental Shelf. It contributes ... -
Permeability evolution of chalk under different stress states
Ma, Shijia (Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06-15)This thesis reports the results obtained from triaxial tests on Kansas outcrop chalk flooded with inert NaCl brine. Permeability measurements are conducted at 50ºC under different stress states simulated by five test ... -
Permeability evolution of shear failing chalk cores under thermochemical influence
Kallesten, Emanuela Iedidia; Andersen, Pål Østebø; Madland, Merete Vadla; Korsnes, Reidar Inge; Omdal, Edvard; Zimmermann, Udo (Peer reviewed; Journal article, 2020-04)Development of petroleum reservoirs, including primary depletion of the pore pressure and repressurization during water injection naturally, leads to changes in effective stresses of the formations. These changes impose ... -
Reactive Flow Simulation
Raaholt, Magnus Kongestøl (Masteroppgave/UIS-TN-IER/2019;, Master thesis, 2019-06-15)Sea water-injection in carbonate formations leads to reactive processes that are linked to affecting oil recovery via wettability alteration and chemical compaction. The concentrations of divalent ions, such as Ca2+, Mg2+, ... -
Validation study of water weakening research from outcrop chalks performed on Eldfisk reservoir cores
Kallesten, Emanuela Iedidia; Cherif, Yosra; Madland, Merete Vadla; Korsnes, Reidar Inge; Omdal, Edvard; Andersen, Pål Østebø; Zimmermann, Udo (Peer reviewed; Journal article, 2020-11)Seawater injection for Enhanced Oil Recovery (EOR) purposes can increase the hydrocarbon recovery factor in carbonate reservoirs but are also responsible for weakening their mechanical strength. This study investigates the ... -
Validation study of water weakening research from outcrop chalks performed on Eldfisk reservoir cores
Kallesten, Emanuela Iedidia; Cherif, Yosra; Madland, Merete Vadla; Korsnes, Reidar Inge; Omdal, Edvard; Andersen, Pål Østebø; Zimmermann, Udo (Peer reviewed; Journal article, 2020-03)Seawater injection for Enhanced Oil Recovery (EOR) purposes can increase the hydrocarbon recovery factor in carbonate reservoirs but are also responsible for weakening their mechanical strength. This study investigates the ... -
Water Weakening of Artificially Fractured Chalk, Fracture Modification and Mineral Precipitation during Water Injection—An Experimental Study
Bredal, Tine Vigdel; Korsnes, Reidar Inge; Zimmermann, Udo; Minde, Mona Wetrhus; Madland, Merete Vadla (Peer reviewed; Journal article, 2022-05)This experiment was designed to study the water-weakening effect of artificially fractured chalk caused by the injection of different compositions of brines under reservoir conditions replicating giant hydrocarbon reservoirs ... -
Water weakening of chalk: A mechanistic study
Madland, Merete Vadla (PhD thesis UiS;11, Doctoral thesis, 2005)Since the detection of the Ekofisk subsidence some 20 years ago, there has been a considerable research activity concerning chalk behaviour in general, and mechanical properties particularly. Due to the importance of water ...