• Acid treatment as a way to reduce shale rock mechanical strength and to create a material prone to the formation of permanent well barrier 

      Gawel, Kamila; Lozovyi, Maksym; Bhuiyan, Mohammad Hossain; Bjørge, Ruben; Fjær, Erling (Peer reviewed; Journal article, 2021)
      Utilization of natural shale formations for the creation of annular barriers in oil and gas wells is currently discussed as a mean of simplifying cumbersome plugging and abandonment procedures. Shales that are likely to ...
    • Adaptation of Laboratory tests for the assessment of wear resistance of drill-bit inserts for rotarypercussive drilling of hard rocks 

      Saai, Afaf; Bjørge, Ruben; Dahl, Filip Erik Bo; Antonov, Maksim; Kane, Pascal-Alexandre; Diop, Jean-Baptiste; Ojala, Niko (Peer reviewed; Journal article, 2020)
      The development of wear resistant materials for drill-bit inserts are of primary importance for efficient percussive drilling in hard abrasive rock. To speed up the development of enhanced wear resistance materials, the ...
    • Atomic structure of clusters and GP-zones in an Al-Mg-Si alloy 

      Marioara, Calin Daniel; Andersen, Sigmund Jarle; Hell, Christoph Martin; Frafjord, Jonas; Friis, Jesper; Bjørge, Ruben; Ringdalen, Inga Gudem; Engler, Olaf; Holmestad, Randi (Peer reviewed; Journal article, 2024)
      The structures of atomic clusters and GP-zones preceding precipitation in an Al-0.70Mg-0.85Si-0.15Fe-0.25Mn (wt. %) alloy have been investigated by annular dark field scanning transmission electron microscopy imaging and ...
    • Carbonation of silica cement at high-temperature well conditions 

      Bjørge, Ruben; Gawel, Kamila; Chavez Panduro, Elvia Anabela; Torsæter, Malin (Journal article; Peer reviewed, 2019)
    • Cement Self-Healing as a Result of CO2 Leakage 

      Kjøller, Claus; Lykourgos, Sigalas; Frykman, Peter; Bjørge, Ruben; Torsæter, Malin (Peer reviewed; Journal article, 2016)
      Avoiding CO2 leakages from storage reservoirs is crucial to ensure safe and cost-efficient Carbon Capture and Storage (CCS). This can only be done if effort is made to maintain well integrity throughout the entire life-cycle ...
    • 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 ...
    • Conductive epoxy/carbon nanofiber coatings for scale control 

      Edvardsen, Laura; Grandcolas, Mathieu; Lædre, Sigrid; Yang, Juan; Lange, Torstein; Bjørge, Ruben; Gawel, Kamila (Peer reviewed; Journal article, 2021)
      Calcium carbonate (CaCO3) is one of the most widespread scaling minerals and has been a long-standing problem within many industrial sectors. Scaling of calcium carbonate on conductive surfaces can be prevented electrochemically ...
    • Detailed investigation of the shearing mechanism of β" precipitates in Al-Mg-Si alloys 

      Christiansen, Emil; Marioara, Calin Daniel; Ringdalen, Inga Gudem; Bjørge, Ruben; Holmedal, Bjørn; Hopperstad, Odd Sture; Holmestad, Randi (Peer reviewed; Journal article, 2020)
      The mechanism behind shearing of β'' precipitates in Al-Mg-Si alloys during deformation is investigated by applying advanced transmission electron microscopy (TEM) techniques and frozen phonon multislice TEM image simulations ...
    • Effect of Sigma Phase in Wire Arc Additive Manufacturing of Superduplex Stainless Steel 

      Akselsen, Odd Magne; Bjørge, Ruben; Ånes, Håkon Wiik; Ren, Xiaobo; Nyhus, Bård (Peer reviewed; Journal article, 2021)
      In the present study, the thermal program in wire and arc additive manufacturing has been varied in terms of heat input and interpass temperature. Three walls were completed with subsequent Charpy V impact toughness and ...
    • Effects of Water Content and Temperature on Bulk Resistivity of Hybrid Cement/Carbon Nanofiber Composites 

      Gawel, Kamila; Taghipour, Ali; Bjørge, Ruben; Wenner, Sigurd; Gawel, Bartlomiej; Ghaderi, Amir; Cerasi, Pierre (Peer reviewed; Journal article, 2020)
      Cement nanocomposites with carbon nanofibers (CNFs) are electrically conductive and sensitive to mechanical loads. These features make them useful for sensing applications. The conductive and load sensing properties are ...
    • Electrical and thermal stability of Al-Cu welds: Performance benchmarking of the hybrid metal extrusion and bonding process 

      Elkjær, Aksel Sean; Sørhaug, Jørgen A; Ringen, Geir; Bjørge, Ruben; Grong, Øystein (Peer reviewed; Journal article, 2022)
      Advances in joining processes for aluminum and copper are sought after to facilitate the greater adoption of aluminum in electrical applications. Aluminum's chemical affinity to copper causes the joining and lifetime of ...
    • Fast Evaluation of Caprock Strength Sensitivity to Different CO2 Solutions Using Small Sample Techniques 

      Edvardsen, Laura; Bhuiyan, Mohammad Hossain; Cerasi, Pierre; Bjørge, Ruben (Peer reviewed; Journal article, 2021)
      The Draupne shale is a rock formation functioning as overburden for gas reservoirs in the Norwegian Sea and potentially as caprock for future CO2 storage locations as well. In this paper, the Draupne shale was exposed to ...
    • Influence of natural aging and ramping before artificial aging on the microstructure of two different 6xxx alloys 

      Hell, Christoph Martin; Søreide, Hanne-Sofie Marie Scisly; Bjørge, Ruben; Marioara, Calin Daniel; Li, Yanjun; Holmestad, Randi (Peer reviewed; Journal article, 2022)
      In this study the effect of a ramp up to artificial aging (AA) temperature in combination with natural aging (NA) was analyzed for two different industrial aluminium alloys. The alloys differ in their Mg/Si ratio as well ...
    • Local mechanical properties and precipitation inhomogeneity in large-grained Al–Mg–Si alloy 

      Hagen, Anette Brocks; Wenner, Sigurd; Bjørge, Ruben; Wan, Di; Marioara, Calin Daniel; Holmestad, Randi; Ringdalen, Inga Gudem (Peer reviewed; Journal article, 2022)
      Al–Mg–Si (6xxx series) alloys show excellent mechanical properties due to the precipitates formed during heat treatment. However, heat treatment of these alloys results in a soft precipitation free zone (PFZ) close to grain ...
    • Microstructural Evolution in a 6060 Extrudable Al-Alloy: Integrated Modeling and Experimental Validation 

      Aristeidakis, John S.; Haidemenopoulos, Gregory N.; Bjørge, Ruben; Marioara, Calin Daniel; Kamoutsi, Helen; Giarmas, Evangelos; Rafailidis, Nikolaos (Peer reviewed; Journal article, 2024)
      Desirable properties including strength, ductility and extrudability of 6060 Al-alloys are highly dependent on processing to control the development of microstructural features. In this study, the process chain of an ...
    • Microstructure and Properties of Wire Arc Additive Manufacturing of Inconel 625 

      Akselsen, Odd Magne; Bjørge, Ruben; Ånes, Håkon Wiik; Ren, Xiaobo; Nyhus, Bård (Peer reviewed; Journal article, 2022)
      In the present investigation, wire arc additive manufacturing of Inconel 625 was carried out with the cold metal transfer variant of the metal inert gas process. The heat input varied between 0.46 and 0.63 kJ/mm, which is ...
    • Monitoring of Co2 Well Plug Integrity. Electrical Response of Cement/CNF Sensor to Mechanical Load, Water Saturation and Carbonation 

      Gawel, Kamila; Wenner, Sigurd; Taghipour, Ali; Szewczyk, Dawid; Edvardsen, Laura; Brocks, Anette; Hagen, Anna Stroisz; Gawel, Bartlomiej; Bjørge, Ruben; Ghaderi, Amir; Cerasi, Pierre; Malin, Torsæter (SINTEF Proceedings;7, Chapter; Peer reviewed; Conference object, 2021)
      CO2 storage wells will eventually need to be permanently plugged and abandoned. Subsidence, fault/fracture reactivation or chemical degradation can all adversely affect well plug integrity leading to CO2 leakages. Thus, ...
    • Multislice image simulations of sheared needle‐like precipitates in an Al‐Mg‐Si alloy 

      Christiansen, Emil; Ringdalen, Inga Gudem; Bjørge, Ruben; Marioara, Calin Daniel; Holmestad, Randi (Peer reviewed; Journal article, 2020)
      The image contrast of sheared needle‐like precipitates in the Al‐Mg‐Si alloy system is investigated with respect to shear‐plane positions, the number of shear‐planes, and the active matrix slip systems through multislice ...
    • On the visibility of GP-zones in 6xxx Al alloys in atomic LAADF-STEM 

      Hell, Christoph Martin; Frafjord, Jonas; Bjørge, Ruben; Friis, Jesper; Holmestad, Randi (Peer reviewed; Journal article, 2024)
      In this work, the contrast seen in low-angle annular dark-field (LAADF) scanning transmission electron microscopy (STEM) of Guinier-Preston zones (GP-zones) in Al-Mg-Si alloys (6xxx) is discussed by STEM simulations, ...
    • Progressive Weakening of Granite by Piezoelectric Excitation of Quartz with Alternating Current 

      Rubio Ruiz, Rafael Arturo; Pournoori, Nazanin; Isakov, Matti; Saksala, Timo; Bjørge, Ruben; Rack, Alexander; Lukic, Bratislav; Cohen, Amitay; Levi-Hevroni, David; Kane, Pascal-Alexandre Saidou; Hokka, Mikko (Peer reviewed; Journal article, 2024)
      A promising solution to reduce energy usage and mitigate the wear of drilling and comminution tools during mining operations involves inducing vibrations within the piezoelectric phases dispersed in the structure of rocks ...