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dc.contributor.authorWang, Lingya
dc.contributor.authorOliver, Dean
dc.date.accessioned2021-08-09T07:35:33Z
dc.date.available2021-08-09T07:35:33Z
dc.date.created2020-11-26T11:50:16Z
dc.date.issued2021
dc.identifier.issn1420-0597
dc.identifier.urihttps://hdl.handle.net/11250/2766859
dc.description.abstractEnsemble methods are remarkably powerful for quantifying geological uncertainty. However, the use of the ensemble of reservoir models for robust optimization (RO) can be computationally demanding. The straightforward computation of the expected net present value (NPV) requires many expensive simulations. To reduce the computational burden without sacrificing accuracy, we present a fast and effective approach that requires only simulation of the mean reservoir model with a bias correction factor. Information from distinct controls and model realizations can be used to estimate bias for different controls. The effectiveness of various bias-correction methods and a linear or quadratic approximation is illustrated by two applications: flow optimization in a one-dimensional model and the drilling-order problem in a synthetic field model. The results show that the approximation of the expected NPV from the mean model is significantly improved by estimating the bias correction factor, and that RO with mean model bias correction is superior to both RO performed using a Taylor series representation of uncertainty and deterministic optimization from a single realization. Use of the bias-corrected mean model to account for model uncertainty allows the application of fairly general optimization methods. In this paper, we apply a nonparametric online learning methodology (learned heuristic search) for efficiently computing an optimal or near-optimal robust drilling sequence on the REEK Field example. This methodology can be used either to optimize a complete drilling sequence or to optimize only the first few wells at a reduced cost by limiting the search depths.
dc.language.isoeng
dc.publisherSpringer
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no
dc.subjectEnsemble based methods
dc.subjectEnsemble-based methods
dc.subjectReservoarmodellering
dc.subjectReservoir modelling
dc.subjectBoring
dc.subjectDrilling
dc.titleFast robust optimization using bias correction applied to the mean model
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.doi10.1007/s10596-020-10017-y
dc.identifier.cristin1852749
dc.source.journalComputational Geosciences
dc.source.pagenumber475-501
dc.relation.projectNorges forskningsråd: RCN 280473
dc.subject.nsiVDP::Geofag: 450
dc.subject.nsiVDP::Geosciences: 450
dc.identifier.citationComputational Geosciences. 2021, 25, 475-501.
dc.source.volume25


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