Browsing UiS Brage by Author "Saasen, Arild"

Now showing items 41-55 of 55

    • New method for measuring viscosity of mixtures of two fluids 

      Slettebø, Jon Kristian (Bachelor thesis, 2023)
      When executing a drilling operation in a well, rheological properties are important to understand in order to have the most error- and problem-free drilling operation as possible. Drilling fluids such as mud, spacer and ...

    • Oil-based drilling fluid's cuttings bed removal properties for deviated wellbores 

      Ytrehus, Jan David; Lund, Bjørnar; Taghipour, Ali; Carazza, Luca; Gyland, Knud Richard; Saasen, Arild (Peer reviewed; Journal article, 2021)
      Results from cuttings transport tests in the laboratory using different field-applied oil-based drilling fluids with similar weight and varying viscosities are presented in this paper. The fluids are designed for highly ...

    • Optimizing formulations for reservoir drilling fluids 

      Bergsvik, Ine Skartveit (Bachelor thesis, 2022)
      When drilling a well, equivalent circulation density exceeding the fracture gradient can cause lost circulation. In a reservoir section, invasion of drilling fluids can potentially cause a permanent permeability reduction ...

    • Plug & abandonment of offshore wells: Ensuring long-term well integrity and cost-efficiency 

      Vrålstad, Torbjørn; Saasen, Arild; Fjær, Erling; Øia, Thomas; Ytrehus, Jan David; Khalifeh, Mahmoud (Peer reviewed; Journal article, 2019-10)
      There is an upcoming "P&A wave" of wells that need to be permanently plugged and abandoned, especially in mature, offshore areas such as the North Sea and Gulf of Mexico. It is important to ensure that plugged wells do not ...

    • Recent developments in hole cleaning technology in deviated well bores for geothermal and petroleum 

      Gåseland Bekkevik,Sindre (Bachelor thesis, 2022)
      This paper is looking on recent developments in hole cleaning technologies and how recent advancements can be used to aid efficient hole cleaning in deviated wells. Successful hole cleaning relies upon integrating optimum ...

    • Rheological Compatibility of a Hardening Spacer Fluid and Oil-based Drilling Fluid 

      Khalili, Pouya; Khalifeh, Mahmoud; Saasen, Arild; Naccache, Monica (Peer reviewed; Journal article, 2023-08)
      In the placement process of the cement slurry, treatment fluids such as the spacer are pumped ahead of the cementitious slurry to minimize the contamination of the slurry by drilling fluid and ensure superior bonding to ...

    • Rheological properties of rock-based geopolymer slurries with different dispersant and counterion combinations 

      Alsvik, Inger-Lise; Vrålstad, Torbjørn; Perumal, Priyadharshini; Saasen, Arild (Peer reviewed; Journal article, 2023)
      The production of Ordinary Portland Cement (OPC) is responsible for a significant part of global CO2 emissions. A potential alternative to OPC is alkali-activated materials (AAM), which do not contain OPC and are not ...

    • Rheology assessment and barite sag in a typical North Sea oil-based drilling fluid at HPHT conditions 

      Ofei, Titus Ntow; Ngouamba, Elie; Opedal, Nils van der Tuuk; Lund, Bjørnar; Saasen, Arild (Peer reviewed; Journal article, 2023)
      The occurrence of barite sag in drilling fluids has relatively often been the cause for gas kicks in oilwell drilling. The subsequent absorption of gas into drilling fluid could lower the density and reduce the viscosity ...

    • Rheology assessment and barite sag in a typical North Sea oil-based drilling fluid at HPHT conditions 

      Ofei, Titus Ntow; Ngouamba, Elie; Opedal, Nils van der Tuuk; Lund, Bjørnar; Saasen, Arild (Peer reviewed; Journal article, 2023)
      The occurrence of barite sag in drilling fluids has relatively often been the cause for gas kicks in oilwell drilling. The subsequent absorption of gas into drilling fluid could lower the density and reduce the viscosity ...

    • Use of the Quemada Model for Modelling Viscous Behaviour of Drilling Fluids. 

      Knutsen, Sandra (Masteroppgave/UIS-TN-IEP/2020;, Master thesis, 2020-07-15)
      Drilling fluids are essential for drilling operations and serve many important functions. To maintain control of the wellbore, while ensuring sufficient cutting transportation, good understanding of the rheological properties ...

    • Using ceramic discs to evaluate fluid loss and formation damage 

      Trodal, Vegard (Bachelor thesis, 2021)
      To prevent kicks and possible blowout of the well, the pressure from the drilling fluid must be kept above the pore pressure of the formation. This differential pressure forces the fluid into the porous formation, which ...

    • Viscosity Models for Drilling Fluids: Herschel-Bulkley Parameters and Their Use 

      Saasen, Arild; Ytrehus, Jan David (Peer reviewed; Journal article, 2020-10)
      An evaluation is presented of the practical usage of the Herschel-Bulkley viscosity model for drilling fluids. If data from automatic viscosity measurements exist, the parameters should be selected from relevant shear rate ...

    • Wet Drilled Cuttings Bed Rheology 

      Pedrosa, Camilo; Saasen, Arild; Lund, Bjørnar; Ytrehus, Jan David (Peer reviewed; Journal article, 2021)
      The cuttings transport efficiency of various drilling fluids has been studied in several approaches. This is an important aspect, since hole cleaning is often a bottleneck in well construction. The studies so far have ...

    • Wet-granular rheology to measure cuttings-bed strength 

      Pedrosa, Camilo; Ytrehus, Jan David; Aschl, Timothy; Lund, Bjørnar; Saasen, Arild (Peer reviewed; Journal article, 2021)
      Drilled cuttings-bed formation is a natural process during wellbore drilling operations, although it is not desired. To optimally remove the drilled cuttings out of the wellbore it is important to break the formed beds. ...

    • Zonal Isolation Material for Low-Temperature Shallow-Depth Application: Evaluation of Early Properties Development 

      Agista, Madhan Nur; Khalifeh, Mahmoud; Saasen, Arild; Yogarajah, Elakneswaran (Peer reviewed; Journal article, 2023)
      Shallow-depth cementing presents unique challenges due to its low temperature and low pore pressure characteristic. The curing process of the cementitious material is typically prolonged at low temperatures resulting in a ...