Hepguler, Barua, and Bard1  recently described the integration of a commercial reservoir simulator and a commercial production network simulator using the Parallel Virtual Machine interface2 . This paper outlines a somewhat different procedure, based on the same interface, that has been used to couple the same commercial black oil reservoir simulator ECLIPSE3  to a different surface model, namely the gas deliverability forecasting model FORGAS4 . For a given case, this new procedure yielded a significant reduction in computation time (a factor of about 30), when compared to the Hepguler et al model, without any loss in accuracy or function. A distinct advantage of this new coupled system is that it is available commercially, unlike the previously described integrated models which were proprietary developments, not available to other companies.

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