Comparative study of the sources of exergy destruction on four North Sea oil and gas platforms

Mari Voldsund, Tuong-Van Nguyen, Brian Elmegaard, Ivar Ståle Ertesvåg, Audun Røsjorde, Knut Jøssang, Signe Kjelstrup

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Abstract

In this paper, the oil and gas processing systems on four North Sea offshore platforms are reported and discussed. Sources of exergy destruction are identified and the findings for the different platforms are compared. Different platforms have different working conditions, such as reservoir temperatures and pressures, gas- and water-to-oil ratios in the feed, crude oil properties, product specifications and recovery strategies. These differences imply that some platforms naturally need less power for oil and gas processing than others. Reservoir properties and composition also vary over the lifetime of an oil field, and to maintain the efficiency of an offshore platform is therefore challenging. In practice, variations in the process feed result in the use of control strategies such as anti-surge recycling, which cause additional power consumption and exergy destruction. For all four platforms, more than 27% of the total exergy destruction takes place in the gas treatment section while at least 16% occurs in the production manifold systems. The exact potential for energy savings and for enhancing system performances differ across offshore platforms. However, the results indicate that the largest potential for improvement lie (i) in gas compression systems where large amounts of gas are often compressed and might be recycled to prevent surge, and (ii) in production manifolds where well-streams are depressurised and mixed before being sent to the separation system.
Original languageEnglish
Title of host publicationProceedings of ECOS 2013 - The 26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, 2013
Number of pages19
PublisherChinese Society of Engineering Thermophysics
Publication date2013
Publication statusPublished - 2013
Event26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Guilin, China
Duration: 16 Jul 201319 Jul 2013
Conference number: 26

Conference

Conference26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Number26
CountryChina
CityGuilin
Period16/07/201319/07/2013

Keywords

  • Exergy destruction
  • oil and gas processing
  • energy-intensive techniques
  • thermodynamic efficiency

Cite this

Voldsund, M., Nguyen, T-V., Elmegaard, B., Ertesvåg, I. S., Røsjorde, A., Jøssang, K., & Kjelstrup, S. (2013). Comparative study of the sources of exergy destruction on four North Sea oil and gas platforms. In Proceedings of ECOS 2013 - The 26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, 2013 Chinese Society of Engineering Thermophysics.