• Carbonation of silica cement at high-temperature well conditions 

      Bjørge, Ruben; Gawel, Kamila; Chavez Panduro, Elvia Anabela; Torsæter, Malin (Journal article; Peer reviewed, 2019)
      Cements for well environments with temperatures above 110 °C are typically designed with silica additions. This is the case for many of the wells in the North Sea, which is a region promising for large-scale geological ...
    • Characterization and structure of precipitates in 6xxx Aluminium Alloys 

      Holmestad, Randi; Bjørge, Ruben; Ehlers, Flemming J H; Torsæter, Malin; Marioara, Calin Daniel; Andersen, Sigmund Jarle (Journal article; Peer reviewed, 2012)
      Solute atom nanoscale precipitates are responsible for the favourable mechanical properties of heat treatable aluminium alloys such as Al-Mg-Si (6xxx). The shape, structure and strengthening properties of age-hardening ...
    • Closing of Micro-cavities in Well Cement upon Exposure to CO2 Brine 

      Chavez Panduro, Elvia Anabela; Torsæter, Malin; Gawel, Kamila; Bjørge, Ruben; Gibaud, Alain; Yang, Yi; Sørensen, Henning; Frykman, Peter; Kjøller, Claus; Breiby, Dag Werner (Journal article; Peer reviewed, 2017)
      Long-lasting cement plugging of wells is crucial for successful CO2 storage in underground reservoirs. It requires a profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions ...
    • Computed X-ray Tomography Study of Carbonate Precipitation in Large Portland Cement Pores 

      Chavez Panduro, Elvia Anabela; Torsæter, Malin; Gawel, Kamila; Bjørge, Ruben; Gibaud, Alain; Bonnin, Anne; Schlepütz, Christian M.; Breiby, Dag Werner (Journal article; Peer reviewed, 2019)
      Cement degradation caused by CO2 exposure is an increasingly important environmental challenge that must be understood, for example, if former oil reservoirs are to be used for CO2 storage. When exposed to CO2-saturated ...
    • Development of a Norwegian open-source plug-and-abandonment database with applications 

      Myrseth, Velaug; Valdes, Gerardo Alfredo Perez; Bakker, Steffen J.; Midthun, Kjetil Trovik; Torsæter, Malin (Journal article; Peer reviewed, 2017)
      An estimated 3,000 oil wells need to be plugged and abandoned on the Norwegian Continental Shelf (NCS), with approximately 150 new wells being drilled each year. The petroleum industry estimates the total plugging costs ...
    • Electrochemical enhancement and inhibition of calcium carbonate deposition 

      Edvardsen, Laura; Gawel, Kamila; Torsæter, Malin; Gawel, Bartlomiej; Wenner, Sigurd (Peer reviewed; Journal article, 2020)
      Calcium carbonate is by far the most widespread scaling material. Its deposition in pipes and flowlines has been a long-standing problem for many industries. Hence, a lot of research is devoted to scale inhibition. One of ...
    • Electrokinetics Application in Concrete and Well Construction 

      Jafariesfad, Narjes; Geiker, Mette Rica; Sangesland, Sigbjørn; Gawel, Kamila; Torsæter, Malin (Chapter, 2020)
      Electrically induced or coupled transport processes including electrophoresis, electroosmosis and electromigration in solutions and porous media under an external electric field have been extensively studied and employed ...
    • Experimental Study of Cement-Formation Bonding 

      Mushtaq, Waqas (Master thesis, 2013)
      This experimental work is the continuation of the literature study of cement-formation bonding, done in the autumn semester. Cement-formation bonding has not been given special attention so far, in resolving the well ...
    • In-situ µ-CT of well cement exposed to CO2-saturated water at high pressure and temperature 

      Børve, Ingrid (Master thesis, 2018)
      Large-scale implementation of carbon dioxide (CO2) sequestration in depleted oil and gas reservoirs may potentially mitigate global climate change. However, successful CO2 storage is contingent on a limited leakage through ...
    • Influence of Thermal Cycling on Cement Sheath Integrity 

      Albawi, Ali (Master thesis, 2013)
      The number of well integrity issues increase in the petroleum industry as wells are exposed to severe downhole conditions and have longer lifetimes. Techniques for enhanced oil recovery, like steam injection and field ...
    • Innovation Accounting - An Empirical Study of Performance Measurement in Industrial Research and Development in the Norwegian Oil and Gas Sector 

      Torsæter, Andreas (Master thesis, 2019)
      The technology risk aversion among decision makers in the oil and gas industry leads to over-cautious technology decisions. To enable an acceleration of technology development and adoption on the Norwegian Continental ...
    • Large Scale Tertiary CO2 EOR in Mature Water Flooded Norwegian Oil Fields 

      Lindeberg, Erik Gøsta Brun; Grimstad, Alv-Arne; Bergmo, Per Eirik Strand; Wessel-Berg, Dag; Torsæter, Malin; Holt, Torleif (Journal article; Peer reviewed, 2017)
      A technical-economical model for a large-scale infrastructure combining CO2 EOR and aquifer storage has been used to construct a scenario including 23 Norwegian Continental Shelf oil fields that have been identified as ...
    • Leakage of CO2 along Annular Well Cement 

      Jafarzade, Gutlug (Master thesis, 2014)
      Carbon Capture and Storage (CCS) projects are aimed to store CO2 underground and to prohibit/restrict any leakage to the well, formation and to the surface. Standards applied to control a well and to keep its integrity are ...
    • Quantitative studies of clustering and precipitation in Al-Mg-Si(-Cu) alloys 

      Torsæter, Malin (Doktoravhandlinger ved NTNU, 1503-8181; 2012:212, Doctoral thesis, 2011)
      In the present work, the clustering and precipitation reactions in age hardenable Al-Mg- Si(-Cu) (6xxx) alloys have been studied by atom probe tomography (APT), transmission electron microscopy (TEM) related methods and ...
    • Real Time 3D Observations of Portland Cement Carbonation at CO2 Storage Conditions 

      Chavez Panduro, Elvia Anabela; Cordonnier, Benoit; Gawel, Kamila; Børve, Ingrid; Iyer, Jaisree; Carroll, Susan; Michels, Leander; Rogowska, Melania; McBeck, Jessica Ann; Sørensen, Henning; Walsh, Stuart; Renard, Francois; Gibaud, Alain; Torsæter, Malin; Breiby, Dag Werner (Peer reviewed; Journal article, 2020)
      Depleted oil reservoirs are considered a viable solution to the global challenge of CO2 storage. A key concern is whether the wells can be suitably sealed with cement to hinder the escape of CO2. Under reservoir conditions, ...
    • Reversal of the negative natural aging effect in Al-Mg-Si alloys 

      Martinsen, Fredrik A; Ehlers, Flemming J H; Torsæter, Malin; Holmestad, Randi (Journal article, 2012)
      The effect of solute clustering on subsequent precipitation has been investigated for three different Al–Mg–Si alloys with similar Mg/Si ratios but different Mg + Si contents. Hardness measurements were carried out (i) ...
    • Salt clogging during supercritical CO2 injection into a downscaled borehole model 

      Berntsen, Andreas Nicolas; Todorovic, Jelena; Raphaug, Martin Hagen; Torsæter, Malin; Chavez Panduro, Elvia Anabela; Gawel, Kamila (Journal article; Peer reviewed, 2019)
      Injection of CO2 into saline storage aquifers is often accompanied by drying of the formation water and salt precipitation. Subsequent salt clogging of a well bore and the near wellbore rock matrix may lead to injectivity ...
    • Synchrotron Study of Cement Hydration: Towards Computed Tomography Analysis of Interfacial Transition Zone 

      Lavrov, Alexandre; Chavez Panduro, Elvia Anabela; Torsæter, Malin (Journal article; Peer reviewed, 2017)
      The quality of bonding between cement and steel in wells is controlled by the interfacial transition zone (ITZ). Micro-computed X-ray tomography (μ-CT) imaging with synchrotron radiation was used in the current paper to ...
    • Use of Tracer Particles for Tracking Fluid Interfaces in Primary Cementing 

      Taheri, Amir; Ytrehus, Jan David; Taghipour, Ali; Lund, Bjørnar; Lavrov, Alexandre; Torsæter, Malin (Chapter, 2019)
      In this study, a new approach for detailed tracking of the interface between well fluid and cement by using particles is investigated. This can improve the quality of annular cementing of CO2 wells and thus the storage ...