AIFE American Institute of Formation Evaluation

AIFE Well Bore Damage Ratings

Perhaps the most valuable determination to be made from test data is in estimating the presence and magnitude of Well Bore Damage. This is particularly true of tests resulting in low fluid recovery. In the absence of recognition of degrees of damage, this has often been read as poor production potential, resulting in the needless abandonment of commercial producers.

In the USDST file, damage ratings have been qualitatively assigned to each drill stem test based on the nature of the build-up curve compared to the recovery.

Types of damage have been categorized as follows:

CLASS I DE Definite Damage
CLASS II PO Possible Damage
b Cannot Be Determined

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