Browsing Institutt for geovitenskap og petroleum by Title
Now showing items 611-630 of 2560
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Dither signal optimization for multi-agent extremum seeking control
(Chapter, 2020)In this paper we formulate and solve the problem of multi-agent extremum seeking with dither signals optimization. The solution is a distributed perturbation-based extremum-seeking controller with an additional objective ... -
Dither signals optimization in constrained multi-agent extremum seeking control
(Peer reviewed; Journal article, 2021)In this paper we consider the problem of optimization of a multi-agent system with constraints through perturbations-based extremum seeking control. We demonstrate that for such systems, effects of dither signals applied ... -
Diving-wave time-lapse delay for CO2 thin layer detection
(Peer reviewed; Journal article, 2024)We have derived an analytical approximate expression to estimate the delay in diving seismic waves due to thin layers of CO2. The expression is valid for high frequencies and can be used to estimate the delay in diving ... -
Do Various Respirator Models Fit the Workers in the Norwegian Smelting Industry?
(Journal article; Peer reviewed, 2019)Background Respirator fit testing is a method to assess if the respirator provides an adequate face seal for the worker. Methods Workers from four Norwegian smelters were invited to participate in the study, and 701 ... -
Downhole Completion of Dual-Lateral Well in Smørbukk Sør, Åsgard
(Master thesis, 2010)Multilateral technology has become a widespread well solution, providing several advantages in terms of exploiting both equipment and reservoirs to the utmost. Having multilateral wells allows marginal formations to be ... -
Downhole errors
(Master thesis, 2019)En av de viktigste utfordringene i industrien i dag er å finne tiltak som kan redusere kostnad. En måte å gjøre dette på er å gjøre boreoperasjonen mer effektiv ved å fjerne kildene til nedetid. Ved å fjerne kilden til en ... -
Downhole failures revealed through ontology engineering
(Peer reviewed; Journal article, 2020)Frequency of failures occurring during offshore oil-well drilling do not diminish over time, probably due to increased operational complexity. The volume and frequency of information generated during the drilling process ... -
Downhole Mechanical Isolation Equipment - Analysis of retrieval operations
(Master thesis, 2015)To encounter challenges when retrieving downhole mechanical isolation (DMI) equipment like plugs, junk baskets and prongs, using well intervention techniques, are not uncommon. These deviations result in additional runs, ... -
Downsizing semi-submersible rig by using an electric BOP and riserless drilling system
(Master thesis, 2021)Sammenlignet med andre sektorer er petroleumsindustrien mer konservativ for å gjøre betydelige endringer, og for å tilpasse ny teknologi. Olje- og gasselskapene foretrekker å holde seg til de tradisjonelle og velprøvde ... -
Drainage Potential Curves of Single Tapping Point for Bulk Oil–Water Separation in Pipe
(Peer reviewed; Journal article, 2022)In this study, experimental quantification of drainage potential curves for unspiked and spiked Exxsol D60 was performed and compared against simplified numerical model results. This potential relates to the flow rate of ... -
Drainage Strategy of Gamma Main Statfjord at the Oseberg Main Field
(Master thesis, 2016)One of the most important jobs of a reservoir engineer is to predict the future production and behaviour of a reservoir. In order to be able to do this job the reservoir engineer is dependent on having a sufficient reservoir ... -
Drift Flux Pipeflow Calculations Using Consistent Black-Oil PVT
(Master thesis, 2020)Abstract will be available on 2023-07-01 -
Driftsplan for kullfelt langs H1 i Gruve 7, med fokus på produktkvalitet, infrastruktur og avdrivingsplan
(Master thesis, 2010)Gruve 7 befinner seg i en situasjon hvor kjente reserver i løpet av få år vil være tømt. Fokuset har derfor blitt rettet mot ressurser i ytre deler av gruva. Området har tidligere vært uinteressant på grunn av dårligere ... -
Drillability in real-time.
(Master thesis, 2013)The formation drillability is an elusive parameter. For theoretical consideration it considered constant and given a value which is representative for the drillability for formations in the Mexican Gulf. The drillability ... -
Drilling equipment erosion
(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 Measurements
(Master thesis, 2020)Strømningsmålinger er en viktig del av boreprosessen. Hensikten med målingene er prosessoptimalisering, monitorering av operasjoner og opprettholding av sikkerhet. Denne masteroppgaven er todelt. Første del handler om ... -
Drilling fluid rheology-simulated and measured friction pressure losses from a well SS-12 in Tanzania.
(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 Fluid Volume Change due to Hydrate Formation and its Impact on Well Control
(Master thesis, 2017)Natural gas hydrates are crystal structures of water containing gas inside cavities. Hydrates can form if gas and water are present in a system with high pressure and low temperature conditions. Hydrate formation is ... -
Drilling in geomechanically stressed formations over and adjacent to salt domes.
(Master thesis, 2015)This thesis is in two parts: The first part is a literature study with the intent of identifying the general behavior of stress perturbations related to some standard, often seen, salt geometries. The second part is an ... -
Drilling in Karstified Carbonates: Early Risk Detection Technique
(Peer reviewed; Journal article, 2020)Heterogeneous nature and complex rock properties of carbonate reservoirs makes the drilling process challenging. One of these challenges is uncontrolled mud loss. Caves or a system of cavities could be a high-risk zone for ...