Energy efficiency measures for offshore oil and gas platforms

Tuong-Van Nguyen, Mari Voldsund, Peter Breuhaus, Brian Elmegaard

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Abstract

Oil and gas platforms are energy-intensive systems { each facility uses from a few to several hundredsMW of energy, depending on the petroleum properties, export specifcations and feld lifetime. Several technologies for increasing the energy effciency of these plants are investigated in this work. They include: (i) the installation of multiple pressure levels in production manifolds, (ii) the implementation of multiphaseexpanders, (iii) the promotion of energy and process integration, (iv) the limitation of gas recirculation around the compressors, (v) the exploitation of low-temperature heat from the gas cooling steps, (vi) the downsizing or replacement of the existing gas turbines, and (vii) the use of the waste heat from the powerplant. The present study builds on four actual cases located in the North and Norwegian Seas, which differ by the type of oil processed, operating conditions and strategies. The benefits and practical limitations of each measure are discussed based on thermodynamic, economic and environmental factors. Signiffcant energy savings and reductions in CO2-emissions are depicted, reaching up to 15-20 %. However, they strongly differ from one facility to another, which suggests that generic improvements can hardly be proposed, and that thorough techno-economic analyses should be conducted for each plant.
Original languageEnglish
JournalEnergy
Volume117
Issue number2
Pages (from-to)325–340
Number of pages24
ISSN0360-5442
DOIs
Publication statusPublished - 2016

Keywords

  • Energy efficiency
  • Process integration
  • Oil and gas platforms

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