What is flow area, how is it calculated and how does it relate to productivity in a well?
The flow area of the perforations is the sum total of the area created by the shaped charges in the casing during perforating operations. This number is usually presented in terms of square inches per foot per or square centimeters per meter of carrier. The formula for calculating the flow area is F = .785 x (D)2 x SD D = diameter of entrance hole (EH) SD = shot density (SPM or SPF) For example a well is perforated at 8 SPF using a big hole shaped charge with an EH of 1.02″. Using the above calculation the flow area would be 6.53 sq. in./ft. Using Metric measurements it would be 134.15 sq. cm.
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