Fetkovich’s Approximation

Vogel’s correlation, normalizing qo by qo,max, is frequently not in close accordance with field data. Fetkovich (1973) suggested a normalization with Image, and in a flow equation of the form

Image

the relationship becomes

Image

Equation (3-63) requires the determination of two unknowns, the absolute open flow potential, qo,max, and the exponent n. Both of them are characteristic of a specific well and therefore a test at two stabilized flow rates can allow the calculation of the corresponding pwf and therefore can lead to the determination of qo,max and n.

Equations (3-55) and (3-62) are both empirical fits and thus should be used accordingly.


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