Browsing NTNU Open by Author "Sjøblom, Johan"
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A critical update of experimental techniques of bulk and interfacial components for fluid characterization with relevance to well fluid processing and transport
Simon, Sebastien Charles; Ruwoldt, Jost; Sjøblom, Johan (Journal article; Peer reviewed, 2020)The present article reviews techniques to address central flow assurance and separation issues. It is our purpose to update the need for extended information in order to draw adequate conclusions about the reason for ... -
A DPD study of asphaltene aggregation: The role of inhibitor and asphaltene structure in diffusion-limited aggregation
Skartlien, Roar; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2017)The kinetic effects of DBSA (dodecyl benzene sulfonic acid) and a linear amphihile on asphaltene aggregation was investigated, using dissipative particle dynamics molecular simulations. The simulation results indicated ... -
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 ... -
An ITC and NMR study of interaction and complexation of asphaltene model compounds in apolar solvent I: Self-association pattern
Simon, Sebastien Charles; Wei, Duo; Barriet, Mathilde Isabelle; Sjøblom, Johan (Journal article; Peer reviewed, 2016)The self-association pattern of asphaltene model compounds with different functional groups in xylene and mixtures of xylene and heptane have been studied by isothermal titration calorimetry (ITC) to shed new light on the ... -
An ITC study of interaction and complexation of asphaltene model compounds in apolar solvent II: Interactions with asphaltene inhibitors
Wei, Duo; Simon, Sebastien Charles; Barriet, Mathilde Isabelle; Sjøblom, Johan (Journal article; Peer reviewed, 2016)The interaction and complexation of asphaltene model compounds containing functional groups with other crude oil compounds in a mixture of xylene and heptane have been studied to shed new light on the association and ... -
Asphaltene fractionation based on adsorption onto calcium carbonate: Part 1. Characterization of sub-fractions and QCM-D measurements
Subramanian, Sreedhar; Simon, Sebastien Charles; Gao, Bicheng; Sjøblom, Johan (Journal article; Peer reviewed, 2016)A new fractionation procedure was developed based on adsorption of asphaltenes onto calcium carbonate. The fractions obtained were characterized by elemental analysis, Fourier Transform Infrared Spectroscopy (FTIR) and ... -
Asphaltene fractionation based on adsorption onto calcium carbonate: Part 3. Effect of asphaltenes on wax crystallization
Ruwoldt, Jost; Subramanian, Sreedhar; Simon, Sebastien Charles; Oschmann, Hans-Jörg; Sjøblom, Johan (Journal article; Peer reviewed, 2018)Asphaltenes fractionation procedures were developed and tested in two preceding articles (doi: https://doi.org/10.1016/j.colsurfa.2016.02.011, doi: https://doi.org/10.1016/j.colsurfa.2016.11.035), and asphaltene fractions ... -
Asphaltene Precipitation Models: A Review
Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2016)Asphaltenes are the heaviest and the most polar fractions of crude oil and are defined as a solubility class (typically soluble in toluene but insoluble in n-alkanes like n-heptane). Precipitation and deposition of asphaltenes ... -
Asphaltenes subfractions characterization and calculation of their solubility parameter using ESI(-) FT-ICR MS: Part II
Pinto, Fernanda E.; Fonseca, Victor R.; Souza, Lindamara M.; Terra, Luciana A.; Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan; Pereira, Thieres M.; Lacerda, Valdemar Jr.; Romão, Wanderson (Peer reviewed; Journal article, 2022)Negative ion-mode electrospray (ESI(-)) technique coupled to Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) provides ionization of polar constituents with ultra-high resolution and mass accuracy. ... -
Asphaltenes subfractions extracted from Brazilian vacuum residue: Chemical characterization and stabilization of model water-in-oil (W/O) emulsions
Zorzenao, Priscila C.S.; Mariath, Rubia M.; Pinto, Fernanda E.; Tose, Lilian V.; Romão, Wanderson; Santos, Alexandre F.; Scheer, Agnes P.; Simon, Sebastien Charles; Sjøblom, Johan; Yamamoto, Carlos I. (Journal article, 2018)Asphaltenes were obtained from a Brazilian vacuum residue (VR) by precipitation with different ratios of n-heptane/VR to give three asphaltene subfractions. The behavior of these different subfractions in relation to the ... -
Assessing the Interfacial Activity of Insoluble Asphaltene Layers: Interfacial Rheology versus Interfacial Tension
Alicke, Alexandra; Simon, Sebastien Charles; Sjøblom, Johan; Vermant, Jan (Peer reviewed; Journal article, 2020)Asphaltenes have been suggested to play an important role in the remarkable stability of some water-in-crude oil emulsions, although the precise mechanisms by which they act are not yet fully understood. Being one of the ... -
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% ... -
Coalescence Behavior of Stable Pendent Drop Pairs Held at Different Electric Potentials
Mhatre, Sameer; Hjartnes, Tomas; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2020)In this work, we studied the electrocoalescence behavior of stable pendent drop pairs and compared the results with clean drops, where the interface is void of surface-active compounds. The drop phase was brine and the ... -
Comparing C5Pe and Asphaltenes under Temperature and Pressure Reservoir Conditions Using an Acoustic Wave Sensor
Cassiède, Marc; Carrier, Hervé; Daridon, Jean-Luc; Simon, Sebastien Charles; Sjøblom, Johan (Peer reviewed; Journal article, 2021)A quartz crystal resonator (QCR) was employed to assess the ability of the C5Pe model asphaltene compound to form nanoaggregates in toluene and bigger flocs that adsorb on the QCR surfaces at a higher concentration of ... -
Demulsification of Crude Oil Emulsions Tracked by Pulsed Field Gradient (PFG) Nuclear Magnetic Resonance (NMR). Part I: Chemical Demulsification
Hjartnes, Tomas; Sørland, Geir H.; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2019)Emulsified water droplets must be extracted from crude oil for economical and transport purposes, which is achievable by chemical demulsification. Four different chemicals were tested on water-in-crude oil emulsions using ... -
Demulsification of crude oil emulsions tracked by pulsed field gradient NMR. Part II: Influence of chemical demulsifiers in external AC electric field
Hjartnes, Tomas; Mhatre, Sameer; Gao, Bicheng; Sørland, Geir; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2020)Crude oil emulsions can reach stability levels that pose severe challenges for the processing industry. Certain conventional methods are used to deal with these challenges, such as chemical demulsification. In this article, ... -
Demulsifier assisted film thinning and coalescence in crude oil emulsions under DC electric fields
Mhatre, Sameer; Simon, Sebastien Charles; Sjøblom, Johan; Xu, Zhenghe (Journal article, 2018)Electrocoalescence has been considered a most efficient method of crude oil dewatering; however, just electric fields are not enough when dealing with heavy crude oils. In this workwe studied effect of asphaltene flocculation ...