Browsing Institutt for kjemisk prosessteknologi by Author "Paso, Kristofer Gunnar"

Now showing items 1-20 of 24

    • Absorption of CO2 in lyotropic liquid crystals 

      Rodriguez Fabia, Sandra; Øyen, Marita; Winter-Hjelm, Nicolai; Norrman, Jens; Lund, Reidar; Sørland, Geir; Knuutila, Hanna; Sjøblom, Johan; Paso, Kristofer Gunnar (Peer reviewed; Journal article, 2020)
      Vapor–liquid equilibria data of three poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)/water liquid crystals (LCs) with CO2 has been obtained up to 6 bar. The investigated LCs consist of 60% (EO)3(PO)50(EO)3 ...

    • Bingham’s model in the oil and gas industry 

      Frigaard, Ian A; Paso, Kristofer Gunnar; de Souza Mendes, Paulo R (Journal article; Peer reviewed, 2017)
      Yield stress fluid flows occur in a great many operations and unit processes within the oil and gas industry. This paper reviews this usage within reservoir flows of heavy oil, drilling fluids and operations, wellbore ...

    • Capture of Carbon Dioxide in Lamellar Phase Liquid Crystals 

      Øyen, Marita (Master thesis, 2018)
      One of the most important environmental concerns the earth faces today is the release of greenhouse gases and other gases that accumulate in the atmosphere. Among these gases, carbon dioxide is one of the most abundant ...

    • Carbon Capture and Utilization from Limestone Calcination 

      Hove, Oda Austad (Master thesis, 2023)
      Dette masterprosjektet studerer bruken av CO2-utslipp fra sementproduksjon og fornybar hydrogen til å produsere metanol. Studien er basert på en Aspen Hysys V11-simulering. Ulike teknologier og termodynamiske modeller ble ...

    • Chemical Additives as Flow Improvers for Waxy Crude Oil and Model Oil: A Critical Review Analyzing Structure–Efficacy Relationships 

      Ansari, Farah; Shinde, Sachin Balasaheb; Paso, Kristofer Gunnar; Sjøblom, Johan; Kumar, Lalit (Journal article; Peer reviewed, 2022)
      Waxy crude oil has become a crucial unconventional oil alternative owing to the depleting conventional oil resources. However, ascertaining flow assurance in a waxy crude oil pipeline at low temperatures is challenging due ...

    • Chemical Modification of Paraffin Wax-Oil Gels 

      Kurniawan, Muh (Doctoral theses at NTNU;2019:222, Doctoral thesis, 2019)
      Paraffin wax crystallized in petroleum production line is well known in causing flow assurance challenges. Wax crystallization behavior is influenced by its interaction with other components co-exist in petroleum fluids. ...

    • CO2 in Lyotropic Liquid Crystals: Monoethanolamine-Facilitated Uptake and Swelling 

      Rodriguez Fabia, Sandra; Norrman, Jens; Sjøblom, Johan; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2018)
      Ternary systems consisting of amphiphilic block copolymers/water/monoethanolamine (MEA) have been studied as potential solvents for carbon capture and storage (CCS). The phase behavior of two poly(ethylene oxide)-poly(propylene ...

    • CO2 in Lyotropic Liquid Crystals: Phase Equilibria Behavior and Rheology 

      Rodriguez Fabia, Sandra; Norrman, Jens; Knuutila, Hanna K; Sjøblom, Johan; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2019)
      The CO2 absorption of liquid crystalline phases of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronic L92, (EO)8(PO)47(EO)8), monoethanolamine (MEA), and water, with a composition of 60% L92/10% ...

    • Cuttings-Bed Erosion in Horizontal Wells: Biopolymers Impact and its Rheological Dependence 

      Mirzaei, Mohsen; Paso, Kristofer Gunnar; Saasen, Arild (Journal article, 2023)
      Efficient wellbore cleaning in highly deviated and horizontal wells is a challenge, as there are large areas where the cuttings tend to be deposited. Insufficient wellbore cleaning could cause major operational problems ...

    • Droplet Crystallization in Water-in-Crude Oil Emulsions: Influence of Salinity and Droplet Size 

      Kolotova, D.; Brichka, K.; Rodionova, Galina; Simon, Sebastien Charles; Derkach, S.; Paso, Kristofer Gunnar; Sjøblom, Johan (Journal article; Peer reviewed, 2017)
      Ice crystallization in confined spherical geometries is investigated experimentally at ambient pressure conditions. Water-in-crude (w/o) oil emulsions are formed by homogenization of an acidic North Sea crude oil with water ...

    • High-Temperature Core Flood Investigation of Nanocellulose as a Green Additive for Enhanced Oil Recovery 

      Aadland, Reidun Cecilie Grønfur; Jakobsen, Trygve Dagsloth; Heggset, Ellinor Bævre; Long-Sanouiller, Haili; Simon, Sebastien Charles; Paso, Kristofer Gunnar; Syverud, Kristin; Torsæter, Ole (Journal article; Peer reviewed, 2019)
      Recent studies have discovered a substantial viscosity increase of aqueous cellulose nanocrystal (CNC) dispersions upon heat aging at temperatures above 90 °C. This distinct change in material properties at very low ...

    • Influence of Measuring Geometry on Rheomalaxis of Macrocrystalline Wax–Oil Gels: Alteration of Breakage Mechanism from Adhesive to Cohesive 

      Rodriguez Fabia, Sandra; Fyllingsnes, Regina Lopez; Winter-Hjelm, Nicolai; Norrman, Jens; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2019)
      Rheological measurement of wax–oil gel breakage is highly susceptible to the phenomenon of adhesive breakage, hindering instrument-scale replication of cohesive breakage processes. Adhesive breakage measurements are ...

    • Influence of Microcrystalline Wax on the Properties of Model Wax-Oil Gels 

      Kurniawan, Muh; Subramanian, Sreedhar; Norrman, Jens; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2018)
      The influence of microcrystalline wax addition upon the rheological properties of model wax-oil gels is investigated. Addition of less than 1 wt % microcrystalline wax to a model oil consisting of 5 wt % macrocrystalline ...

    • Influence of Wax Inhibitor Molecular Weight on Solution Crystallization and Rheology of Monodisperse Waxes 

      Kurniawan, Muh; Ruwoldt, Jost; Norrman, Jens; Paso, Kristofer Gunnar (Peer reviewed; Journal article, 2021)
      Molecular weight fractionation via stepwise precipitation or chain scission is performed on four pour point depressant polymers to study the pour point reduction mechanism. An homologous series of model oils is prepared ...

    • Inhibitor-Wax Interactions and Wax Crystallization: New Experimental Approaches and Techniques 

      Ruwoldt, Jost (Doctoral theses at NTNU;2018:410, Doctoral thesis, 2018)
      Issues related to wax crystallization are one of the major challenges faced during crude oil production. Wax inhibitors and pour point depressants (PPD) are in common use for wax prevention, as they can delay gelling and ...

    • Interactions between Surfactants and Cellulose Nanofibrils for Enhanced Oil Recovery 

      Jakobsen, Trygve Dagsloth; Simon, Sebastien Charles; Heggset, Ellinor Bævre; Syverud, Kristin; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2018)
      Chemical enhanced oil recovery (EOR) represents a series of potential solutions for extracting more oil from resources with already known locations and magnitudes. Unfortunately, many of the chemical additives in use today ...

    • Investigation of a new application for cellulose nanocrystals: a study of the enhanced oil recovery potential by use of a green additive 

      Molnes, Silje; Mamonov, Aleksandr; Paso, Kristofer Gunnar; Strand, Skule; Syverud, Kristin (Journal article; Peer reviewed, 2018)
      Cellulose nanocrystals (CNC) were investigated for use in a potential new application, enhanced oil recovery. Core flooding experiments were performed on outcrop sandstone cores using CNC particles dispersed in low salinity ...

    • Lyotropic Liquid Crystals: CO2 Capture and Phase Behavior 

      Fabià, Sandra Rodriguez (Doctoral theses at NTNU;2019:122, Doctoral thesis, 2019)
      The rising greenhouse gas emissions, in particular CO2, have contributed to an increase of the global temperature. In order to combat the severe effects of climate change, actions are being taken to favor a switch to low ...

    • Pour point depressant efficacy as a function of paraffin chain-length 

      Kurniawan, Muh; Norrman, Jens; Paso, Kristofer Gunnar (Peer reviewed; Journal article, 2022)
      Pour point depressant (PPD) activity mechanisms include solubilization, morphology alteration, and steric/entropic repulsion. A wealth of complex intermolecular interactions governs PPD efficacies in real crude compositions. ...

    • Process Integration of Green Hydrogen: Decarbonization of Chemical Industries 

      Ostadi, Mohammad; Paso, Kristofer Gunnar; Rodriguez Fabia, Sandra; Øi, Lars Erik; Manenti, Flavio; Hillestad, Magne (Journal article; Peer reviewed, 2020)
      Integrated water electrolysis is a core principle of new process configurations for decarbonized heavy industries. Water electrolysis generates H2 and O2 and involves an exchange of thermal energy. In this manuscript, we ...