• Can Heating Induce Borehole Closure? 

      Xie, Xiyang; Bauer, Andreas; Stenebråten, Jørn; Bakheim, Sigurd; Lavrov, Alexandre; Fjær, Erling; Kristiansen, Tron Golder (Peer reviewed; Journal article, 2020)
      The current study shows that heating a cased borehole in low-permeability shale rock can induce plastic deformation, leading to the closure of the casing annulus and decreasing annulus connectivity. The thermally induced ...
    • Challenging Infrastructure Project Assisted by Monitoring and Numerical Modelling as the Follo Line Tunnels were Excavated Below Existing Tunnels 

      Trinh, Quoc Nghia; Holmøy, Kristin Hilde; Wiig, Hanne (Peer reviewed; Journal article, 2021)
      Just south of Oslo Central Station, the new high-speed Follo Line railway tunnels pass beneath the existing Ekeberg road tunnels. This paper presents the construction methods, numerical model, and monitoring program used ...
    • 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 ...
    • From Static to Dynamic Stiffness of Shales: Frequency and Stress Dependence 

      Lozovyi, Serhii; Bauer, Andreas (Peer reviewed; Journal article, 2019)
      The relation between static and dynamic stiffness in shales is important for many engineering applications. Dynamic stiffness, calculated from wave velocities, is often related to static stiffness through simple empirical ...
    • Influence of Weight-on-Bit on Percussive Drilling Performance 

      Song, Xianfeng; Aamo, Ole Morten; Kane, Pascal-Alexandre; Detournay, Emmanuel (Peer reviewed; Journal article, 2020)
      A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. ...
    • Thermo‑Poromechanical Properties of Pierre II Shale 

      Agofack, Nicolaine; Cerasi, Pierre; Sønstebø, Eyvind Frode; Stenebråten, Jørn (Peer reviewed; Journal article, 2022)
      During the injection of carbon dioxide (CO2) for CO2 capture and storage (CCS) operations, the near-well (including casing, cement, and rock around it) can undergo several thermal loadings. These loadings can significantly ...
    • Two New Methods for Defining Shut‑In Pressure in Hydraulic Fracturing Tests 

      Trinh, Quoc Nghia; Hagen, Simon Alexander; Strømsvik, Helene; Larsen, Trond Erik; Grøv, Eivind (Peer reviewed; Journal article, 2023)
      Hydraulic fracturing is one of the most common methods to determine in situ rock stress. The interpretation of the shut-in pressure to determine the minor principal stress is an important element of this method, and many ...
    • Validity of the NTNU Prediction Model for D&B Tunnelling 

      Jakobsen, Pål Drevland; Grøv, Eivind; Bruland, Amund; Gjengedal, Sondre (Peer reviewed; Journal article, 2023)
      The Norwegian University of Science and Technology (NTNU) has since the early 1970s published prediction models for estimated production rates, time consumption, and costs for rock works. Since the early development of the ...