An integrated production system model is an important tool for optimizing gas field planning and mitigating risks. It combines reservoir performance, well inflow and outflow, the surface gathering system and the production host into a single model in which operating envelopes and constraints are captured. Using the tool, representative system production forecasts can be generated to test alternative development decisions against a range of reservoir outcomes, allowing optimum solutions to be identified.

This paper describes the integrated production system modeling approach taken during feasibility studies for areally extensive offshore gas field. Examples of the development decisions tested using the model were the type and size of production host, the type and phasing of wells and the flow assurance strategy.

Key learnings were the need to be systematic about data inputs across disciplines, quality assurance of forecast results and understanding the level of refinement of the model and what development decisions it can reliably be used for. Many gas field development decisions are inter-related and the integrated system model serves as a useful tool for alignment and consistency across the project team.

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