Evaluation of the life performance of oil and gas oshore platforms: Site-scale integration and exergy-based assessment

Oil and gas platforms are energy-intensive systems, which operate under changing boundary conditions over time. In this paper, the life performance of an oshore platform is analysed by comparing three representative stages of an oil eld (early-life, plateau and end-life productions). The energy requirements are assessed by a process integration study, and the system ineciencies are pinpointed by performing an exergy accounting. The heating and cooling requirements vary signicantly over time, and most ineciencies take place in processes where chemical exergy is consumed (’ 50{55%), thermal exergy is transferred (’ 15{20%), or mechanical exergy is varied (’ 10{15%). These ndings are valid for all production periods: this suggests that more attention should be paid on a proper integration of the processing and utility plants, by, for instance, recovering heat from the turbine exhausts and from the exported gas. Multi-objective optimisations are conducted for evaluating the integration of steam and organic Rankine cycles, considering thermodynamic, economic and environmental performance indicators. They indicate that the protability of

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