In recent years, there have been significant developments in the optimization of hydraulic fracture treatment of wells with one pay zone, but studies concerning treatment in wells with multiple zonesare virtually nonexistent. Because a significant portion, it not a majority, of hydraulic fracture treatments are done in wells with multiple pay zones, discussions are presented to show (1) the use of limited technology leads to uneconomical depletion of the formation and (2) a model for effectively designing fracture treatment for multiple pay zones.

Three field examples are presented to illustrate the various uses of the model in optimizing hydraulic fracturing treatment of wells with multiple zones.

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