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dc.contributor.advisorRoll, Kristin Helen
dc.contributor.advisorThorstensen, Egil
dc.contributor.advisorStraume, Martin K.
dc.contributor.authorEgge, Silje Rosnes
dc.description.abstractThe number of wells to be abandoned on the Norwegian Continental Shelf will increase in the forthcoming years. As a consequence, significant expenditures will be required paid by the individual companies, the state and the society. Despite many technological advances in the oil and gas industry the recent years, traditional P&A of platform wells is still particularly performed by using expensive drilling rigs. In an industry characterized by time-consuming, costly, and complex operations, it is especially interesting to investigate the technological potential of P&A and possible cost-savings this may entail. This thesis therefore considers rigless P&A of platform wells, where the use of well intervention equipment is presented as an alternative approach to traditional rig-based P&A. Three different case studies of P&A are explored and presented: a rig-based approach, a rigless approach, as well as a combination of rig-based and rigless approach. Well intervention equipment such as wireline and a hydraulic jacking unit are involved in the emerging, rigless method. In order to suggest the most appropriate and cost-efficient abandonment approach, three models are built and used in a Monte Carlo simulation to forecast cost and duration of the different P&A operations. By using well intervention equipment, risk and uncertainties related to unpredictability in the rig marked is removed, which simplifies the time and cost forecasting. To achieve accurate estimation of cost and duration, data is collected with awareness. Historical data, particularly from Aker BP, as well as expert opinions and knowledge, are thus used as simulation input to produce realistic forecasts. The simulation output of the different models is compared, discussed and evaluated using the percentile output values. Findings from the case studies identifies that rigless P&A is much more time-consuming than rig-based P&A. However, partly reducing and completely removing the rig scope leads to significant cost-savings. Since the chosen simulation models consider P&A of a single well, this opens an opportunity for further research within time and cost simulation for multiple wells on platforms.
dc.titleA Cost-Efficient Approach to Rigless P&A of Platform Wells
dc.typeMaster thesis

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  • Studentoppgaver (TN-ISØP) [1407]
    Master- og bacheloroppgaver i Byutvikling og urban design / Offshore technology : risk management / Risikostyring / Teknologi/Sivilingeniør : industriell økonomi / Teknologi/Sivilingeniør : risikostyring / Teknologi/Sivilingeniør : samfunnssikkerhet

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