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Summary An equation for calculating the pseudosteady-state flow—i.e., the productivity—of a horizontal well is presented that is easy to use and identical in form to the well-known productivity equation for a vertical well. The equation was extracted from a very complex general solution. Application of the equation requires the determination of two parameters: (1) a geometric factor that accounts for the effect of permeability anisotropy, well location, and the relative dimensions of the drainage volume and (2) the skin caused by restricted entry, which accounts for the effect of well length. The paper gives simple equations for calculating these two parameters. The equation is used to study the effects on well productivity of well length, location, and degree of penetration; vertical and horizontal permeabilities; and the horizontal dimensions of the drainage volume. It is concluded that, though each of these variables has a significant effect, the well length and degree of penetration have the strongest.
Babu et al. (Wed,) studied this question.
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