The engineering and construction phase does not contain any decisions, but carries out the decisions made in the conceptual study phase. Any pre-drilling of production wells decided in the conceptual study phase is done during this phase.
It is assumed that the time spent on engineering and construction is independent of the selected concept (cf. Wallace et al (1985a)), and any differences between various concepts are therefore limited to the construction and operating cost, the installed capacity and the flexibility to increase the capacity. Construction cost for the production unit (the semi-submersible) is related to the installed capacity and the possibility to expand the capacity at subsequent stages. The cost is positively related with both. That is, the higher the installed capacity is, the higher is the construction cost, and the more
capacity flexibility the platform offers, the more costly is the concept.
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