A multi layered heterogeneous oil reservoir was selected for this study. The integrated reservoir characterization model and the pertinent transformed reservoir simulation history matched model were quality assured and quality checked.

The development scheme was identified and selected where the pattern and completion of the wells were defined to fit the heterogeneity of the reservoir characterization model. Lateral and maximum block contact holes were investigated.

The development processes studied were mainly hydrogen sulphide, carbon dioxide, nitrogen and rich hydrocarbon gas. The Water Alternating Gas/ Simultaneous Water Alternating Gas (WAG / SWAG) processes were also assured. In addition to the main gas and WAG/SWAG processes, many miscible and immiscible EOR processes were also investigated though the results are not presented but may be referred to.

Field development options based on the development and processes schemes as well as reservoir management and long-term business plans including phases of implementation were identified and assured. The development option that maximizes the ultimate recovery factor was evaluated and selected.

The main objective of this work was to define the development process that could give a maximum ultimate recovery factor of more than 70 %. This could increase the total technical reserves by 30 % over the reserves based on classical water flooding reserves. It may be said that the life of the field could be extended to be almost doubled. The best technically development process that gives a maximum ultimate recovery factor of more than 70 % was the H2S-WAG development process. The enriched-WAG development scheme can be designed to give an equivalent ultimate recovery factor by enriching the gas.

The N2-WAG development process gives a relatively poor recovery factor. This is the lowest of all the Non-hydrocarbon Gas Injection (NHGI-WAG) development processes investigated.

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