Browsing USN Open Archive by Author "Berg, Christian"
Now showing items 1-5 of 5
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An approximate well-balanced upgrade of Godunov-type schemes for the isothermal Euler equations and the drift flux model with laminar friction and gravitation
Abbasi, Mohammad Hossein; Naderi Lordejani, Sajad; Berg, Christian; Iapichino, Laura; Schilders, Wil H. A.; van de Wouw, Nathan (Peer reviewed; Journal article, 2020)In this article, approximate well-balanced (WB) finite-volume schemes are developed for the isothermal Euler equations and the drift flux model (DFM), widely used for the simulation of single- and two-phase flows. The ... -
Computational Fluid Dynamics Study of the Effects of Drill Cuttings on the Open Channel Flow
Welahettige, Prasanna Kumara Welahetti; Berg, Christian; Lundberg, Joachim; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)A three-dimensional computational fluid dynamics (CFD) study was carried out for drilling fluid flow with drill cuttings in open channels. The flow is similar to the return flow when drilling, stream containing drilling ... -
Modeling for Automatic Control and Estimation of Influx and Loss During Drilling Operations
Berg, Christian (Doctoral dissertations at the University of South-Eastern Norway;61, Doctoral thesis, 2020-03-20)In the modern energy driven world, oil and gas will be important resources, at least in the foreseeable future. Wells with challenging pressure windows are more com-monly drilled, and in recent years the drop in oil prices ... -
Pressure wave propagation in Managed Pressure Drilling- model comparison with real life data
Berg, Christian; Stakvik, Jon Åge; Lie, Bernt; Vågsæther, Knut; Kaasa, Glenn-Ole (Peer reviewed; Journal article, 2019)Drilling for oil and gas is a complex process, involving pumping of fluid through kilometers of pipes. Even though the drilling fluid has a high speed of sound (˜1000 m/s), the large lengths involved make pressure wave ... -
Viscoelastic entrance flow of Hydrolized Polyacrylamide (HPAAM)
Berg, Christian (Master thesis, 2015-11-12)The use of polymers in polymer/water flooding enhanced oil recovery (EOR) is a technique used since just after World War 2, and with several full scale fields in operation. Increasing oil prices and more challenging ...