Blar i NTNU Open på forfatter "Skalle, Pål"

Viser treff 41-60 av 75

    • INVESTIGATION OF STATIONARY CUTTINGS BED HEIGHT IN WASHOUT 

      Jacob, Aniefiok Edet (Master thesis, 2013)
      Knowledge of the amount of cuttings that have accumulated in a drilled wellbore is part of the information necessary for the effective control of bottom-hole pressure, preventing stuck pipe and minimizing circulation time ...

    • Lithology detetection in real time 

      Garcia-Delgado, Jorge (Master thesis, 2013)
      The works published until today about lithological interpretation in drilling, use the ROP, rate of penetration, as the base for the diagnosis. These analyses are poorly detailed and often limited to distinction between ...

    • Methods of Pore Pressure Detection from Real-time Drilling Data 

      Stunes, Sindre (Master thesis, 2012)
      The knowledge of formation pore pressure, and how it changes throughout the length of a well, is crucial in terms of maintaining control of the wellbore. Failure to recognize deviations from the expected pressures can lead ...

    • Model for evaluating drilling efficiency based on the concept of Mechanical Specific Energy 

      Tveit, Øyvind Sæther; Berg, Paal Vegar (Master thesis, 2016)
      Systems to increase efficiency during drilling is desirable in order to have more costeffective well operations. This master s thesis studies the possibility to present new information real-time regarding the actual drilling ...

    • Model of Hook Load During Tripping Operation 

      Kristensen, Edvin (Master thesis, 2013)
      Drilling after oil and gas becomes more challenging for every drilled well; deeper, longer, harder, higher temperature, higher pressure and more complex conditions. The equipment requirements and well integrity regulations ...

    • Modeling of gel deformation 

      Basarab, Nataliya (Master thesis, 2013)
      Drilling fluids can build a gel structure under periods with ceased circulation. Pumping or drill string rotation can be used to break the gel. In some cases the measures might fail, e.g. gel breaking pressure might exceed ...

    • Modellering av YPL Fluid Strømning i Eksentrisk Annulus med Borestrengsrotasjon 

      Næsgaard, Henrik Sehested (Master thesis, 2012)
      Denne oppgaven omhandler teoretisk modellering av trykktap grunnet rotasjon i eksentriske borehull med Herschel-Bulkley strømning. En eksisterende modell for trykktap for konsentriske borehull ble videreført til å inkorporere ...

    • Modelling of Surface Hook Load Signals when Tripping Out of Hole 

      Ekseth, Astrid Fosså (Master thesis, 2013)
      World demand for oil and natural gas are increasing, at the same time as most easyaccessible oil are being drained. Therefore, more complex and longer extendedreachwells (ERD) are required by the petroleum industry. The ...

    • Modelling of the Transient Pressure Build-up in Long Wellbores 

      Sissener, Olaf Hedberg (Master thesis, 2015)
      Drilling of long oil wells becomes increasingly more common in the oil and gas industry, as cost rises and complexity of undrilled reservoirs increases. This introduces a challenge that grow in severity with the length of ...

    • Nano-Enabled Cement System for Well Cementing 

      Jafariesfad, Narjes (Doctoral theses at NTNU;2017:213, Doctoral thesis, 2017)
      The main goal of primary cementing is to provide zonal isolation in oil and gas wells. In general, the failure of the cement sheath to maintain long-term zonal isolation is due to: Low tensile properties ...

    • Nanorubber-modified cement system for oil and gas well cementing application 

      Jafariesfad, Narjes; Khalifeh, Mahmoud; Skalle, Pål; Geiker, Mette Rica (Journal article, 2017)
      Flexible cement systems with low shrinkage are more capable than the conventional cement systems to withstand the tensile stresses generated by fluctuation of temperature and pressure in oil and gas wells. In this work ...

    • Nanosized Magnesium Oxide With Engineered Expansive Property for Enhanced Cement-System Performance 

      Jafariesfad, Narjes; Geiker, Mette Rica; Skalle, Pål (Journal article, 2017)
      The bulk shrinkage of cement sheaths in oil wells can result in loss of long-term zonal isolation. Expansive additives are used to mitigate bulk shrinkage. To compensate effectively for bulk shrinkage during the late plastic ...

    • Observed and Estimated Effects of Cuttings on Equivalent Circulating Density 

      Berg, Maria Helene Skram (Master thesis, 2014)
      More extended reach wells, highly deviated and ultra deep are being drilled to meet the world s continuously increasing energy demand. Hole cleaning remains one of the greatest challenges throughout drilling operations, ...

    • Parameter Detection in real time Drilling Data - Create a Matlab agent to forecast changes in formation hardness 

      Donne, Clement Pierre Jean (Master thesis, 2017)
      Nowadays, being cost efficient is a major issue of the oil and gas sector. Reducing Non Productive Time (NPT) is one of the solutions to tackle this challenge. As a result, the industry is always looking for more solutions ...

    • Prediction of Failures While Drilling 

      Årstad, Andreas Øveraasen; Rosland, Daniel Vilhelm (Master thesis, 2016)
      Complex drilling operations, high production expenses and a low oil price influence the modern petroleum industry. Reducing the non-productive-time (NPT) during an operation can reduce the production expenses. Drilling, ...

    • Problem solving in uncertain domains by a Bayesian supported knowledge-intensive case-based reasoning method 

      Nikpour, Hoda (Doctoral theses at NTNU;2021:349, Doctoral thesis, 2021)

    • Quantifying Formation Hardness and Pore Pressure using the Bourgoyne-Young Drilling Model 

      Osheim, Bertil (Master thesis, 2019)
      Formasjonshardheten og poretrykket er to viktige faktorer som må grundig undersøkes under planleggingsfasen og under boreoperasjonene av en brønn. Begge er korrelert til bore-effektiviteten og har potensial til å påføre ...

    • Reveal the Cause of Downhole Restrictions by Means of Knowledge Engineering 

      Agasøster, Marit Innvær (Master thesis, 2013)
      Stuck pipe is an example of an unwanted problem that causes high NPT and seemsto occur again and again. As 50 % of all stuck pipe incidents occur during tripping,increased knowledge about how to recognize progressing ...

    • Revealing Causes of Restrictions by Signatures in Real-Time Hook Load Signals 

      Bjerke, Hanne (Master thesis, 2013)
      Downhole restrictions are causing non-productive time, which represents large economic losses. Knowing the cause of the restriction in order to implement the correct remedies are crucial for preventing extensive cleaning ...

    • Revealing of pack offs in RTDD 

      Karim, Ari Hamid (Master thesis, 2013)
      Pack off is a major problem in the drilling industry today, and it will continue to be so until a solution to this problem is found. Being able to find pack offs and in addition to having an understanding of the mechanisms ...