Effective wellbore radius of a horizontal well - Method 1 - Isotropic reservoirs

Input(s)

L: Horizontal Well Length (ft)

$\mathrm{h}$: Pay Zone Thickness $(\mathrm{ft})$

$\mathrm{r}_{\mathrm{w}}$: Wellbore Radius ( $\mathrm{ft}$ )

$\mathrm{k}_{\mathrm{h}}$: Horizontal Permeability $(\mathrm{mD})$

$\mathrm{k}_{\mathrm{v}}$: Vertical Permeability $(\mathrm{mD})$

A: Drainage Area (acre)

Output(s)

$\mathrm{r}_{\mathrm{eh}}$: Effective Drainage Radius (ft)

a: Horizontal wellbore variable from Joshi (dimensionless)

$\mathrm{r}_{\mathrm{wd}}$: Effective Wellbore Radius (ft)

Formula(s)

Reference(s)

Horizontal Well Technology, Joshi, Page: 90.