Velocity estimation in mixtures using tomography

E. Cahyono, M.E. Hochstenbach, J. Molenaar, W.H.A. Schilders, G.M. Terra

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

In oil production a lot of water is usually pumped up together with the oil. For many reasons the reduction of the water production is a very important issue. The method presented in this paper is meant to provide a necessary tool for this. Most drilling wells consist of a network of bore holes. Some of them may produce water, others oil or a mixture. At the moment the net flow of all bore holes together is brought to the surface. It is desirable to be able to detect how much water a specific bore hole contributes. If this amount surpasses a critical value one could then consider to close that bore hole. This leads to the question how the composition of the flow in a pipe can be determined in situ.
In this paper we analyze how tomography techniques, well-known from medical applications, can be applied in the case of a bore hole. These techniques allow to measure instantaneously the mass distribution over a cross section of the pipe. For velocity estimation, the idea is to detect the mass distributions at two neighbouring cross sections at successive times. Correlating the obtained time series, one might be able to estimate the local velocity profile.
The basic idea was already mentioned in literature before, but it was believed that the number of correlations to be evaluated is so huge, that the approach would fail in practice. In this paper we describe the mathematical details of the method and conclude that the number of time consuming calculations is not necessarily a limiting factor. In addition, suggestions are made to facilitate the use of tomography for velocity estimation.
Original languageEnglish
Title of host publicationProceedings of the Thirty-ninth European Study Group with Industry
EditorsBarbara W. van der Fliert, Gjerrit Meinsma
PublisherShaker Publishing
Pages1-19
ISBN (Print)90-423-0132-5
Publication statusPublished - 9 Oct 2001
Event39th European Study Group with Industry, ESGI 2000 - University of Twente, Enschede, Netherlands
Duration: 9 Oct 200013 Oct 2000
Conference number: 39

Workshop

Workshop39th European Study Group with Industry, ESGI 2000
Abbreviated titleESGI
CountryNetherlands
CityEnschede
Period9/10/0013/10/00

Fingerprint

Tomography
Water
Pipe
Medical applications
Time series
Drilling
Chemical analysis
Oils

Keywords

  • METIS-200492

Cite this

Cahyono, E., Hochstenbach, M. E., Molenaar, J., Schilders, W. H. A., & Terra, G. M. (2001). Velocity estimation in mixtures using tomography. In B. W. van der Fliert, & G. Meinsma (Eds.), Proceedings of the Thirty-ninth European Study Group with Industry (pp. 1-19). Shaker Publishing.
Cahyono, E. ; Hochstenbach, M.E. ; Molenaar, J. ; Schilders, W.H.A. ; Terra, G.M. / Velocity estimation in mixtures using tomography. Proceedings of the Thirty-ninth European Study Group with Industry. editor / Barbara W. van der Fliert ; Gjerrit Meinsma. Shaker Publishing, 2001. pp. 1-19
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Cahyono, E, Hochstenbach, ME, Molenaar, J, Schilders, WHA & Terra, GM 2001, Velocity estimation in mixtures using tomography. in BW van der Fliert & G Meinsma (eds), Proceedings of the Thirty-ninth European Study Group with Industry. Shaker Publishing, pp. 1-19, 39th European Study Group with Industry, ESGI 2000, Enschede, Netherlands, 9/10/00.

Velocity estimation in mixtures using tomography. / Cahyono, E.; Hochstenbach, M.E.; Molenaar, J.; Schilders, W.H.A.; Terra, G.M.

Proceedings of the Thirty-ninth European Study Group with Industry. ed. / Barbara W. van der Fliert; Gjerrit Meinsma. Shaker Publishing, 2001. p. 1-19.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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T1 - Velocity estimation in mixtures using tomography

AU - Cahyono, E.

AU - Hochstenbach, M.E.

AU - Molenaar, J.

AU - Schilders, W.H.A.

AU - Terra, G.M.

PY - 2001/10/9

Y1 - 2001/10/9

N2 - In oil production a lot of water is usually pumped up together with the oil. For many reasons the reduction of the water production is a very important issue. The method presented in this paper is meant to provide a necessary tool for this. Most drilling wells consist of a network of bore holes. Some of them may produce water, others oil or a mixture. At the moment the net flow of all bore holes together is brought to the surface. It is desirable to be able to detect how much water a specific bore hole contributes. If this amount surpasses a critical value one could then consider to close that bore hole. This leads to the question how the composition of the flow in a pipe can be determined in situ.In this paper we analyze how tomography techniques, well-known from medical applications, can be applied in the case of a bore hole. These techniques allow to measure instantaneously the mass distribution over a cross section of the pipe. For velocity estimation, the idea is to detect the mass distributions at two neighbouring cross sections at successive times. Correlating the obtained time series, one might be able to estimate the local velocity profile.The basic idea was already mentioned in literature before, but it was believed that the number of correlations to be evaluated is so huge, that the approach would fail in practice. In this paper we describe the mathematical details of the method and conclude that the number of time consuming calculations is not necessarily a limiting factor. In addition, suggestions are made to facilitate the use of tomography for velocity estimation.

AB - In oil production a lot of water is usually pumped up together with the oil. For many reasons the reduction of the water production is a very important issue. The method presented in this paper is meant to provide a necessary tool for this. Most drilling wells consist of a network of bore holes. Some of them may produce water, others oil or a mixture. At the moment the net flow of all bore holes together is brought to the surface. It is desirable to be able to detect how much water a specific bore hole contributes. If this amount surpasses a critical value one could then consider to close that bore hole. This leads to the question how the composition of the flow in a pipe can be determined in situ.In this paper we analyze how tomography techniques, well-known from medical applications, can be applied in the case of a bore hole. These techniques allow to measure instantaneously the mass distribution over a cross section of the pipe. For velocity estimation, the idea is to detect the mass distributions at two neighbouring cross sections at successive times. Correlating the obtained time series, one might be able to estimate the local velocity profile.The basic idea was already mentioned in literature before, but it was believed that the number of correlations to be evaluated is so huge, that the approach would fail in practice. In this paper we describe the mathematical details of the method and conclude that the number of time consuming calculations is not necessarily a limiting factor. In addition, suggestions are made to facilitate the use of tomography for velocity estimation.

KW - METIS-200492

M3 - Conference contribution

SN - 90-423-0132-5

SP - 1

EP - 19

BT - Proceedings of the Thirty-ninth European Study Group with Industry

A2 - van der Fliert, Barbara W.

A2 - Meinsma, Gjerrit

PB - Shaker Publishing

ER -

Cahyono E, Hochstenbach ME, Molenaar J, Schilders WHA, Terra GM. Velocity estimation in mixtures using tomography. In van der Fliert BW, Meinsma G, editors, Proceedings of the Thirty-ninth European Study Group with Industry. Shaker Publishing. 2001. p. 1-19