Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field.
In this thesis, a simplified model of the MEG loop at the Snøhvit field is established and implemented, together with an unscented Kalman filter. The model is tested with and without the Kalman filter. The model is tested with test data, while the model included the Kalman filter is tested with both...
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2013
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/260990 2023-05-15T18:20:12+02:00 Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. Mørk, Anders Jordtveit Imsland, Lars Norges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for teknisk kybernetikk 2013 http://hdl.handle.net/11250/260990 eng eng Institutt for teknisk kybernetikk 648695 ntnudaim:8868 http://hdl.handle.net/11250/260990 89 Master thesis 2013 ftntnutrondheimi 2019-09-17T06:49:49Z In this thesis, a simplified model of the MEG loop at the Snøhvit field is established and implemented, together with an unscented Kalman filter. The model is tested with and without the Kalman filter. The model is tested with test data, while the model included the Kalman filter is tested with both test data and real production data.It is found that the model is some part away from the real process. The most significant difference is the rate of rich MEG into the MEG-regenerator onshore, which in the real process has severe oscillations relative to the rate of lean MEG rate out of the MEG-regenerator. In the model the rich MEG is modeled primarily to follow the lean MEG rate, and is therefore fairly constant.For many data sets of real production data, the system is not able to predict the formation water, because the error covariance matrix in the Kalman filter becomes negative semi definite. This can be caused by the Kalman filter not being robust enough or/and inconsistent data from Snøhvit. Still, when a data set is found where the system is able to predict the formation water is found, the system does predict a formation water rate that is located in the region that is expected at the Snøhvit field. Master Thesis Snøhvit NTNU Open Archive (Norwegian University of Science and Technology) |
institution |
Open Polar |
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NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
In this thesis, a simplified model of the MEG loop at the Snøhvit field is established and implemented, together with an unscented Kalman filter. The model is tested with and without the Kalman filter. The model is tested with test data, while the model included the Kalman filter is tested with both test data and real production data.It is found that the model is some part away from the real process. The most significant difference is the rate of rich MEG into the MEG-regenerator onshore, which in the real process has severe oscillations relative to the rate of lean MEG rate out of the MEG-regenerator. In the model the rich MEG is modeled primarily to follow the lean MEG rate, and is therefore fairly constant.For many data sets of real production data, the system is not able to predict the formation water, because the error covariance matrix in the Kalman filter becomes negative semi definite. This can be caused by the Kalman filter not being robust enough or/and inconsistent data from Snøhvit. Still, when a data set is found where the system is able to predict the formation water is found, the system does predict a formation water rate that is located in the region that is expected at the Snøhvit field. |
author2 |
Imsland, Lars Norges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for teknisk kybernetikk |
format |
Master Thesis |
author |
Mørk, Anders Jordtveit |
spellingShingle |
Mørk, Anders Jordtveit Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. |
author_facet |
Mørk, Anders Jordtveit |
author_sort |
Mørk, Anders Jordtveit |
title |
Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. |
title_short |
Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. |
title_full |
Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. |
title_fullStr |
Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. |
title_full_unstemmed |
Estimation of Formation Water rate using Unscented Kalman filtering with application to the Snøhvit Gas/Condensate Field. |
title_sort |
estimation of formation water rate using unscented kalman filtering with application to the snøhvit gas/condensate field. |
publisher |
Institutt for teknisk kybernetikk |
publishDate |
2013 |
url |
http://hdl.handle.net/11250/260990 |
genre |
Snøhvit |
genre_facet |
Snøhvit |
op_source |
89 |
op_relation |
648695 ntnudaim:8868 http://hdl.handle.net/11250/260990 |
_version_ |
1766197696442400768 |