• A Case Study of How MPD Techniques Can Be Used to Adapt to Uncertain Pore and Fracture Pressure Gradients 

      Wenaas, Anders (Master thesis, 2014)
      This thesis aims to identify the potential and limitations of using Managed Pressure Drilling (MPD) in deepwater fields where narrow and unpredictable mud weight windows are encountered. A significant effort has been done ...
    • A Comparative Analysis of Rheological Characteristics of Polymer Solutions Exposed to Temperature and Stress Over Time 

      Arnesen, Jostein Dale (Master thesis, 2017)
      A series of experiments with thixotropic fluids composed of polymers and salt, with various temperatures and in circulation was carried out to examine how it influenced the current polymers decompositioning. The results ...
    • A novel model-based scheme for kick and loss mitigation during drilling 

      Hauge, Espen; Aamo, Ole Morten; Godhavn, John-Morten; Nygaard, Olav Gerhard Haukenes (Journal article; Peer reviewed, 2013)
      A model-based in-/out-flux detection scheme for managed pressure drilling is presented. We apply a globally exponentially stable adaptive observer which estimates the unknown states and parameters of the hydraulic system ...
    • A Study in Limiting Factors for Extended Reach Drilling of Highly Deviated Wells in Deep Waters 

      Bakke, Øyvind Opsal (Master thesis, 2012)
      Drilling in deep water is requiring more advanced technology as fields at greater depths are being discovered. Managed Pressure Drilling and Dual Gradient Drilling are both offering different techniques for navigating ...
    • Analysis of the Influence of Wellbore Deposits on Wireline Well Intervention Operations 

      Wold, Magnus Wingan (Master thesis, 2015)
      Well intervention activities are crucial for maintaining well performance and integrity throughout the whole lifecycle of oil producers and injectors. Typical operations involve perforation, logging, setting and pulling ...
    • Automatic Well Control Simulations 

      Erikson, Lars (Master thesis, 2012)
      Every year kick incidents occur, maybe best remembered by the Macondo blowout in April 2010 resulting in devastating oil spills throughout the Gulf of Mexico. Well control is one of the most important factors in any drilling ...
    • Benefits of using Wired Drill Pipe in coring operations; analysis of data from the North Sea 

      Taraldsen, Turi (Master thesis, 2017)
      Mud Pulse Telemetry (MPT) is the standard way of communicating with downhole tools on the Norwegian Continental Shelf today. Wired Drill Pipe (WDP) is a high-speed telemetry alternative to traditional telemetry systems. ...
    • Bruk av MPC for MPD 

      Møgster, Johannes (Master thesis, 2013)
      Nedihols trykkregulering er den avgjerande faktoren når det kjem til tryggleik under søk og utvinning av hydrokarbonar. Viss trykket blir for høgt eller for lågt, kan det resultere i at miljøfarleg borevæske blir sølt eller ...
    • Bullheading- Praksis og modelering 

      Nøkling, Kjetil (Master thesis, 2014)
      I denne oppgaven vil bullheading bli vurdert og modellert. Oppgaven vil vise utvalgte bruksområder for metoden og hvilke problemer og utfordringer som ligger i bruken av disse og sette fokus på momentene som genereres under ...
    • Circulating out minor influxes through open riser during dual gradient drilling with a partly evacuated riser 

      Austein, Jon (Master thesis, 2012)
      Today, with conventional drilling technology, the cost of drilling deep and ultra-deepwater wells is very high, thus many reservoirs are classified as non-economical. Some reservoirs may also be impossible to reach with ...
    • Control with discrete output: Step choke control 

      Dehli, Martin Lamo (Master thesis, 2013)
      The need and requirement for obtaining good and reliable models of the oil and gas reservoirs are increasingly important. A trustworthy and high-quality model will facilitate the optimisation of the productivity, which ...
    • Disturbance Rejection by Feedback Control in Offshore Drilling: Experimental Results 

      Albert, Anders; Aamo, Ole Morten; Godhavn, John-Morten; Pavlov, Alexey (Journal article; Peer reviewed, 2014)
      As oil exploration and development costs rise, the oil industry increases its efforts to improve oil recovery (IOR) from existing fields. IOR is achieved mainly by drilling more wells, but drilling in partially depleted ...
    • Drilling equipment erosion 

      Mjelde, Per Hammersland (Master thesis, 2018)
      Erosion is a major problem in the oil and gas industry. The primary focus within the industry has been within oil and gas production as erosion is a limiting factor for production rates, and therefore heavily economically ...
    • Drilling fluid rheology-simulated and measured friction pressure losses from a well SS-12 in Tanzania. 

      Rukonu, Daniel Charles (Master thesis, 2017)
      A study of Drilling fluid rheology-Simulated and friction pressures losses was carried in Well SS-12, Tanzania.Three rheological models were used,Such as Bingham plastic ,power law and Herschel-Bulklely model.The rheological ...
    • Drilling in Salt Formations and Rate of Penetration Modelling 

      Håpnes, Mats (Master thesis, 2014)
      As the industrialization of the world is growing, both energy consumption anddemand are steadily increasing. Hydrocarbons have been an important energyprovider for several decades, but the production from mature oil and ...
    • Drilling mud property estimator 

      Ljones, Tone (Master thesis, 2013)
      In 1969 the first petroleum discovery was made on the Norwegian continental shelf. This founding marks the beginning of what has become the most important contribution to the Norwegian economy. Advanced research within the ...
    • Drilling of Deep-set Carbonates Using Pressurized Mud Cap Drilling 

      Helgeland, Leif Rune (Master thesis, 2014)
      A majority of the easy fields have already been developed, while demand for oil and gas continues to increase rapidly. Reservoirs in deep-set carbonates contains a large amount of the worlds remaining hydrocarbons and ...
    • Dual gradient drilling simulations 

      Sigurjonsson, Kjartan Örn (Master thesis, 2012)
      The system studied in this thesis is called the Low Rise Return system and uses a partly filled marine drilling riser with a variable mud level which is used control the bottom holes pressure.Initially main components of ...
    • Dynamic Simulation of Gas Expansion in Marine Risers 

      Velmurugan, Naveen (Master thesis, 2016)
      The main objective of the work is to study the dynamic behavior of gas expansion in marine risers. In case of well control situations in deep and ultra deep waters, gas influx shows no warnings if not little, making it ...
    • Ensemble Kalman Filtering for State and Parameter Estimation on a Reservoir Model 

      Jensen, John Petter (Master thesis, 2007)
      In reservoir management it is important with reservoir models that have good predictive abilities. Since the models initially are based on measurements with high uncertainties it is important to utilize new available data. ...