Vis enkel innførsel

dc.contributor.authorGjerde, Tony
dc.contributor.authorEidsvik, Jo
dc.contributor.authorNyrnes, Erik
dc.contributor.authorBruun, Bjørn
dc.date.accessioned2019-10-08T10:43:16Z
dc.date.available2019-10-08T10:43:16Z
dc.date.created2012-01-11T10:20:04Z
dc.date.issued2011
dc.identifier.citationJournal of Geodetic Science. 2011, 1 (2), 158-169.nb_NO
dc.identifier.issn2081-9919
dc.identifier.urihttp://hdl.handle.net/11250/2620854
dc.description.abstractWe present a new model for the estimation of positional uncertainty of petroleum wells. The model uses a heavy tailed normal inverse Gaussian distribution for the errors in Earth's magnetic field reference values. These references are required for calculating the position of a well using magnetic directional surveying. The results show that the normal inverse Gaussian distribution gives a more realistic fit to the Earth's magnetic field reference values than the normal distribution, which is the current state of art. Errors in surveying sensors and reference errors are propagated along the well path to obtain the positioning uncertainty. The positional uncertainty is important for the probability of collisions between wells and for drilling accurate relief wells when an eventual collision has resulted in a blow-out situation. We compare results of the normal model used in the petroleum industry with our proposed model. The comparison is made for anti-collision calculations between drilled wells and a planned well. The results indicate a higher risk of collisions for certain well geometries when using the normal distribution, while a collision is avoided in the normal inverse Gaussian situation. We find clear differences between an approximate normal test and a Monte Carlo test.nb_NO
dc.language.isoengnb_NO
dc.publisherDe Gryuternb_NO
dc.titlePositioning and position error of petroleum wellsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber158-169nb_NO
dc.source.volume1nb_NO
dc.source.journalJournal of Geodetic Sciencenb_NO
dc.source.issue2nb_NO
dc.identifier.doi10.2478/v10156-010-0019-y
dc.identifier.cristin881899
dc.description.localcodeThis content is open access.nb_NO
cristin.unitcode194,63,15,0
cristin.unitnameInstitutt for matematiske fag
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel