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<xsd:documentation>The ratio of flow rate to pressure drop. Used for oil wells,
PI is the barrels of oil produced per day per psi decline in bottomhole flowing pressure.</xsd:documentation>
<xsd:documentation>The term that accounts for additional pressure drops in the immediate
vicinity of a well in well performance calculations, such as transient pressure test analysis.
Positive skin effects indicate damaged conditions. Negative skin effects indicate stimulated conditions.</xsd:documentation>