Pseudo-skin factor due to partial penetration (Papatzacos correlation)

Input(s)

$h_{p}$: Perforation interval $(\mathrm{ft})$

$\mathrm{h}$ : Total pay thickness $(\mathrm{ft})$

$h_{1}$ : Distance from top of reservoir to top of open interval (ft) $k_{v}$: Horizontal permeability $(\mathrm{mD})$

$k_{h}$ : Vertical permeability $(\mathrm{mD})$

$r_{w}$: Wellbore dia $(\mathrm{ft})$

Output(s)

b: Penetration ratio (dimensionless)

A: Constant for calc (dimensionless)

B: Constant for calc (dimensionless)

$h_{d}$ : Dimensionless payzone thickness (dimensionless)

$s_{p}$ : Skin due to partial penetration (dimensionless)

Formula(s)

Reference(s)

Horizontal Well Technology, Joshi, Page: 498.