Blar i NTNU Open på forfatter "Sjöblom, Johan"
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A study of the formation mechanism of calcium naphtenate deposits by using the axisymmetric drop shape analysis technique
Tofte, Sondre Waage (Master thesis, 2018)New batches of ARN were extracted with a yield of 15-17 % and with a purity of 92-93 %. The axisymmetric drop shape analysis (ADSA) technique was used on different samples of ARN, xylene and asphaltenes to study the ... -
Amino-Functionalized Magnetic Nanoparticles for Extraction of Naphthenic Acids
Strand, Mikael (Master thesis, 2016)The present work is a part of a 2-year Post Doc project carried out by a Vista program funded by Statoil and conducted in close collaboration with The Norwegian Academy of Science and Letters. The goal of the main project ... -
Asphaltene fractionation based on adsorption onto calcium carbonate: Part 2. Self-association and aggregation properties
Subramanian, Sreedhar; Sørland, Geir Humborstad; Simon, Sebastien Charles Roger; Xu, Zhenghe; Sjöblom, Johan (Journal article; Peer reviewed, 2017)The self-association and aggregation properties of asphaltene sub-fractions obtained by adsorption onto CaCO3 (doi:http://dx.doi.org/10.1016/j.colsurfa.2016.02.011) were investigated using a combination of near infrared ... -
Cloud Point Depressants
Ali, Hassan (Master thesis, 2012)Wax formation and deposition in subsea crude oil piepline is most important problem in cold environments faced by petroleum industry. Significant research is been going on at industrial as well as academic levels to develop ... -
Destabilization of crude oil emulsions by combining chemicals and electric fields
Jakobsen, Angela (Master thesis, 2015)In today s oil industry the increasing scarcity of the conventional oil is inevitable and pushes the oil companies towards the exploitation of unconventional oils such as oil- sands, heavy oil and extra heavy oil. During ... -
Destabilization of Emulsions in Porous Media
Moen, Ann Kathrin (Master thesis, 2016)Oil and water can form emulsions with different stability conditions while flowing through the porous systems in an oil reservoir. The stability of different oil-in-water (o/w), water-in-oil (w/o), and oil-in-water-in-oil ... -
Determination of Mass of Tetrameric Acid at the Air/Water Interface by Combining Langmuir-Schaefer with QCM Measurements
Aleksandersen, Hanne Rekdalsbakken (Master thesis, 2013)Tetra-acid (also known as Arn) is a molecule present in petroleum crude oil at low concentration, typically the ppm level, which can precipitate in presence of calcium to form deposits. These deposits have an impact on oil ... -
Flow Improvers for Heavy Crude Oil Transport in Pipe
Fagerdal, Stine (Master thesis, 2014)The transportation of heavy oil is challenging as the oil has high viscosity and heavy components like asphaltenes. By finding an effective flow improver the transporting could be less demanding and more cost effective. ... -
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 ... -
Interfacial dilation rheology properties of films formed at the oil/water interface by reaction between acid and calcium ion
Blanco Manotas, Estefania (Master thesis, 2017)Interaction between ARN and Asphaltenes and consequences for the solubility of ARN in oil -
Isolation and Characterization of Oil-Soluble Calcium Naphthenates in North Sea Heavy Crude Oil
Christiansen, Ida (Master thesis, 2014)Naphthenic acids are a diverse group of saturated mono- and polycyclic carboxylic acids that may account for as much as 10-12 weight % of crude oil. During production at several newer oil fields, there have been discoveries ... -
Isolation, Characterization and Prediction of Calcium Naphthenates in High Acid Crude Oils
Bertheussen, Are (Master thesis, 2015)Calcium naphthenates in crude oil causes operational problems in refineries and lowers the market price for oil production companies. This Master s thesis aims to study the naphthenic acids who form calcium naphthenates ... -
Magnetic Nanoparticles for Extraction of Naphthenic Acids from Model Oil
Ronander, Mia Elise (Master thesis, 2015)The Master s thesis aims for synthesis of magnetic nanoparticles (MNP), silica-coated magnetic nanoparticles, and their application for extraction of naphthenic acids (NA) from model oil. The present work is a part of a ... -
Mitigation and remediation of asphaltene precipitation, deposition and plug formation: Importance of asphaltene subfractions
Subramanian, Sreedhar (Doctoral theses at NTNU;2017:110, Doctoral thesis, 2017)Asphaltenes represent the heaviest and most polar constituent of petroleum. They consist of a wide range of molecules differing in molecular weight and functional groups. Under reservoir conditions, the asphaltenes generally ... -
Polyethyleneimine-coated magnetic iron oxide nanoparticles for improvement of flow assurance
Fyllingsnes, Regina Lopez (Master thesis, 2017)This thesis aims to gain further insight into how the naphthenic acids (NA), which cause different problems with respect to flow assurance, can be removed from the water phase. The main objective has been to test how ... -
Study of Aggregation of Tetrameric Acid and its Interaction with Crude Oil Asphaltenes by Isothermal Titration Calorimetry
Orlandi, Ezequiel (Master thesis, 2013)Tetrameric acids, also called Arn, are a family of molecules present in crude oils and responsible for formation of deposits by reaction with calcium ions. These deposits are detrimental to oil production and therefore the ... -
Study of Desorption of Asphaltene from Solid Surface by Use of Solvents and Chemicals
Tapio, Lene Katrin (Master thesis, 2015)A study of adsorption and desorption of asphaltene on a stainless steel surface was preformed. A quartz crystal microbalance (QCM) was used for the the study. Different solvents were tested for their ability to desorb ... -
Study of the mechanism of demulsification of petroleum crude oil emulsions by demulsifiers
Subramanian, Sreedhar (Master thesis, 2013)The formation of stable emulsions during the production of crude oil is an expensive problem faced by the oil industry. Stable emulsions can be encountered during recovery, treatment or transportation of crude oil. Asphaltenes ... -
Synergy between chemical demulsification and electrocoalescence: From bench to large scale
Hjartnes, Tomas Noreide (Doctoral theses at NTNU;2020:64, Doctoral thesis, 2020)Production of crude oil from reservoirs always contain additional fluids, namely formation water and gas that occur naturally below the surface or seabed. Especially problematic is the water that becomes dispersed within ... -
The Influence of Salts with Different Cation Valency on Oil-in-Water Emulsion Stability
Nisja, Trine (Master thesis, 2015)The effect of different emulsion preparation parameters on the stability of oil-in-water (o/w) emulsions has been studied by varying the preparation parameters and then observing the emulsion visually. Change in the turbidity ...