Blar i NTNU Open på forfatter "Willersrud, Anders"
-
A Framework for Fault Diagnosis in Managed Pressure Drilling Applied to Flow-Loop Data
Willersrud, Anders; Imsland, Lars Struen; Pavlov, Alexey; Kaasa, Glenn-Ole (Journal article; Peer reviewed, 2013)Data from a medium-scale horizontal flow loop test facility is used to test fault diagnosis in managed pressure drilling. The faults are downhole incidents such as formation influx, fluid loss, drillstring washout, pack-off, ... -
Condition Monitoring of Hydroelectric Power Plants
Åsnes, Asgeir Øen (Master thesis, 2018)Much research can be found on condition monitoring for many industries. There are, however, very little research on the use of condition monitoring in hydroelectric power plants. A literature search investigates this field, ... -
Drillstring Washout Diagnosis using Friction Estimation and Statistical Change Detection
Willersrud, Anders; Blanke, Mogens; Imsland, Lars Struen; Pavlov, Alexey K. (Journal article; Peer reviewed, 2015)In oil and gas drilling, corrosion or tensile stress can give small holes in the drillstring, which can cause leakage and prevent sufficient flow of drilling fluid. If such \emph{washout} remains undetected and develops, ... -
Early pack-off diagnosis in drilling using an adaptive observer and statistical change detection
Willersrud, Anders; Imsland, Lars Struen; Blanke, Mogens (Journal article, 2015)Pack-off is a partially or complete blocking of the circulation flow in oil and gas drilling, which can lead to costly delays. Early detection and localization of a pack-off is crucial in order to take necessary actions ... -
Fault diagnosis of downhole drilling incidents using adaptive observers and statistical change detection
Willersrud, Anders; Blanke, Mogens; Imsland, Lars Struen; Pavlov, Alexey (Journal article; Peer reviewed, 2015)Downhole abnormal incidents during oil and gas drilling cause costly delays, and may also potentially lead to dangerous scenarios. Different incidents will cause changes to different parts of the physics of the process. ... -
Incident detection and isolation in drilling using analytical redundancy relations
Willersrud, Anders; Blanke, Mogens; Imsland, Lars Struen (Journal article; Peer reviewed, 2015-08)Early diagnosis of incidents that could delay or endanger a drilling operation for oil or gas is essential to limit field development costs. Warnings about downhole incidents should come early enough to allow intervention ... -
Model-Based Diagnosis of Drilling Incidents
Willersrud, Anders (Doctoral thesis at NTNU;2015:147, Doctoral thesis, 2015)Oil and gas drilling is an advanced process with very little instrumentation, where drilling uid is transported through rotating drillstrings of up to several kilometers, possibly at extreme depths with high pressure and ... -
Short-Term Production Optimization in an Offshore Oil and Gas Processing Plant Using Nonlinear Model Predictive Control
Willersrud, Anders (Master thesis, 2010)The main objective in this thesis is to study how nonlinear model predictive control (NMPC) can be used directly for short-term production optimization. Here the objective to maximize the production is directly included ... -
Short-term production optimization of offshore oil and gas production using nonlinear model predictive control
Willersrud, Anders; Imsland, Lars Struen; Hauger, Svein Olav; Kittilsen, Pål (Journal article, 2013)The topic of this paper is the application of nonlinear model predictive control (NMPC) for optimizing control of an offshore oil and gas production facility. Of particular interest is the use of NMPC for direct short-term ...