Formula 1.31
Effective wellbore radius of a horizontal well - van der Vlis et al. method
Input(s)
h: Pay Zone Thickness (ft)
$\mathrm{r}_{\mathrm{w}}$: Wellbore Radius ( $\mathrm{ft}$ )
$\alpha$: Slant Angle (degrees)
Output(s)
L: Length of Slant Wellbore (ft)
$\mathrm{r}_{\mathrm{w}}$: Effective Wellbore Radius ( $\mathrm{ft}$ )
Formula(s)
$$ \begin{gathered} \mathrm{L}=\frac{\mathrm{h}}{\cos (\alpha)} \\ \mathrm{r}_{\mathrm{w}}=\frac{\mathrm{L}}{4} *\left[0.454 * \sin \left(360 *\left(\frac{\mathrm{r}_{\mathrm{w}}}{\mathrm{h}}\right)\right)\right]^{\frac{\mathrm{h}}{\mathrm{L}}} \end{gathered} $$
Reference(s)
Joshi, S. D. 1991, Horizontal Well Technology. Tulsa, Oklahoma: PennWell Publishing Company. Chapter: 3, Page: 96.