A commercial reservoir simulator capable of simulating operational changes in a steam flood was used to investigate the effect of steam slug size, water injection temperature, water injection rate and pattern lifting capacity in converting from steam to water injection. Inverted seven-spot and five-spot patterns were used for heavy oils and light oils reservoirs, respectively. The optimum steam slug size which is dependent on the injection, production and reservoir parameters was determined for both the heavy and light oil reservoir cases based on economic studies for realizing the maximum revenue on a project.

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