Mudcake permeability - Formation invasion

Input(s)

$\mu$: Viscosity $(\mathrm{cP})$

$h(t)$: Filtrate Height (in.)

$x_{c}(t)$: Mudcake Growth by time (in./s)

$\Delta p$: Pressure Change (psi)

$t$: Time (s)

Output(s)

$k$: Viscous Shear Stress at the outer Mudcake boundary (lb/in. ${ }^{2}$ )

Formula(s)

$$ k=\frac{\mu \cdot h(t) x_{c}(t)}{(2 t \Delta p)} $$

Reference(s)

Chin, W. C. (1995). Formation Invasion, Page: 95.