Field A situated, offshore Borneo, Malaysia, with 30 years of production, was identified as candidate for Enhanced Oil Recovery (EOR). Immiscible water alternating gas (iWAG) was identified as a suitable EOR process from screening studies. Implementation of Enhanced Oil Recovery schemes for brown field re-development requires an understanding of recovery mechanisms from pore-scale to the field scale, and commonly requires the use of reservoir models which can represent the reservoir at these different scales. A fit-for-purpose integrated reservoir modeling (IRM) approach to analyse the risks and benefits of IWAG process will be presented in this paper. Results of the study would help in understanding the IWAG process and in the implementation of the EOR scheme in the other fields in the region, which have similar geological setup and depositional environments.


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