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Closed-Loop Field Development and Management (CLFDM) was originally conceived as a combination of model-based optimization and data assimilation. The purpose of this approach is to use new information over the reservoir life-cycle to reduce uncertainties, assist decision making and improve production strategy performance.

In UNISIM group, the closed-loop development and management methodology is divided into 12 steps and can be applied in fields at any stage of development. The 12 steps include:

- Reservoir characterization under uncertainties: data gathering and uncertainty survey for model construction and calibration. Several simulation models are generated, representing the uncertainties of the reservoir. In this step, the model fidelity (simulation grid size) is analyzed in order to balance the quality of the results and the computational time.

- Long term model-based decisions: optimization of production strategy under uncertainties. Thus, there is the generation of dynamic data, such as: pressure, productions, seismic data, etc.

- Data assimilation: according to the assimilated data, the best models are selected for use in the stage of production strategy optimization. Models can be changed according to the assimilated data.

Flowchart of closed-loop reservoir development and management methodology.
Flowchart of closed-loop reservoir development and management methodology.