The inverted decline curve, or IDC, is the plot of the inverse of a well's producing rate (l/q) against the log of its producing time. IF the well's producing pressure history is known, this curve can be used to determine reservoir permeability, the skin effect, and the area being drained by the well. For a hydraulically fractured well, the length of an infinite conductivity fracture which is equivalent to the actual finite conductivity fracture can also be determined.
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