
Concept and Feasibility Studies
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Concept Definition provides the link between field development planning and FEED. A single, well defined option is selected to complete the conceptual phase.
Concept Definition, or pre-FEED, adds a further level of detail to the option selected at the conclusion of Concept Select to achieve more precise definition, a better cost estimate and, ultimately, a scope of work for FEED.
The scale of a Concept Definition or pre-FEED phase can vary dramatically depending on the nature of the project. Regardless of scale, the activities in Concept Definition are chosen to address the development's circumstances and can include:
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Process scheme optimisation
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Reduction in optionality using targeted studies of particular aspects of design e.g. technology selection
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Finalisation of field architecture
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Preliminary P&ID development
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Layout development
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Issue of enquiries for long lead or high cost items
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Cost estimating and economic assessment
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Project schedule enhancement
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Preparation of survey scopes of work, tendering and management of the work
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Engagement with other work groups and third parties to reduce uncertainties e.g. drilling, reservoir engineering, tie-ins to other facilities, regulatory authorities, buyers of products.
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Development of risk mitigation plans
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Project execution plan and contracting strategy finalisation
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Basis of design update
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Commencement of the ESIA process
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FEED Scope of Work

As a result, the development enters FEED with a well-defined option in which:
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Major design decisions have been made;
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Risks and uncertainties are understood and mitigated where appropriate;
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The execution approach, cost estimate, budgets and schedules are clear and complete.