Oil production over the last several decades has become more dependent upon secondary and tertiary recovery techniques. There have been significant advances in the use of reservoir modeling to help design and evaluate these processes. Unfortunately, there have not been similar advances made in the tools for reservoir surveillance. Injection costs can be the major factor contributing to the profit or loss of a project, therefore creating the need to maximize injection efficiency.

Combining streamlining techniques with the micro-computer can result in an invaluable reservoir surveillance aid. A streamline program can be used to generate an allocation matrix not only for each pattern but also for each fractional pattern. The allocation matrix can then be used with other programs to distribute the production and injection to each well and fractional pattern. Monitoring the project on a fractional pattern basis enables the reservoir surveillance engineer to promptly identify potential problems and to make modifications as necessary to maximize profitability. The injection-withdrawal ratio can be evaluated for each fractional pattern, for individual wells, or for the entire project. Injection requirements can be determined more precisely for each well to maximize utilization of the injectant and minimize costly recycling.

This paper reviews how a streamline model has been integrated with an allocation program on a micro-computer to maximize reservoir surveillance.

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