Underbalanced perforating has become accepted as one of the best methods for creating open, undamaged perforations.1 2  However, the magnitude of the underbalanced pressure which can safely be used to complete the well is a major uncertainty, especially in unconsolidated or poorly consolidated sands. This paper describes an integrated well data analysis procedure to estimate the safe underbalance perforating pressure and the well response to a short ‘cleanup’ flow period. The design procedure utilizes open-hole logs, fluid data, and reservoir data to determine the formation mechanical properties and to build a reservoir fluid flow model. The design results can then be compared to the actual well performance. This is evaluated using transient pressure analysis of the data acquired in conjunction with the underbalance perforating. A field example is used to illustrate the design and evaluation of a tubing-conveyed perforating well completion.

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