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dc.contributor.advisorGodhavn, John-Mortennb_NO
dc.contributor.authorSigurjonsson, Kjartan Örnnb_NO
dc.date.accessioned2014-12-19T12:16:07Z
dc.date.available2014-12-19T12:16:07Z
dc.date.created2012-11-08nb_NO
dc.date.issued2012nb_NO
dc.identifier565864nb_NO
dc.identifierntnudaim:7786nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/239714
dc.description.abstractThe system studied in this thesis is called the Low Rise Return system and uses a partly filled marine drilling riser with a variable mud level which is used control the bottom holes pressure.Initially main components of the Low Riser Return System are listed and explained. Then the performance characteristics of the system are explored. Level movements in riser during level increase and decrease at constant mud pump rates are explained along with the effect of mud pump rate on maximum level increase and decrease rates.A simple simulator is then presented that calculates the bottom hole pressure when pump rates are changed. The simulator includes a function that enables it to simulate lost circulation scenarios.The simulator is used to simulate some preferred scenarios. First a pressure increase and decrease at constant mud pump rates are simulated. Then it is shown how a faster pressure decrease can be achieved by temporarily lowering the mud pump rate. Next simulations are shown where changes in mud level are used to compensate for changes in equivalent circulation density as mud pump rates are changed. Finally simulations are run that demonstrate how mud level can be reduced to cure lost circulation scenarios. Results and lessons learned are then discussed.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for petroleumsteknologi og anvendt geofysikknb_NO
dc.subjectntnudaim:7786no_NO
dc.subjectMSG1 Petroleum Engineeringno_NO
dc.subjectDrilling Engineeringno_NO
dc.titleDual gradient drilling simulationsnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber60nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for petroleumsteknologi og anvendt geofysikknb_NO


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