In SI unit system:

p_D =\frac{\sigma}{q_t} \, \Delta p

where

pressure drop

total sandface flowrate

reservoir transmissibility


In Oil Field unit system:

p_D =\frac{\sigma}{141.2 \, q_t} \, \Delta p

where

psibpd(md·ft)/cp



See Also


Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Pressure Diffusion

Well & Reservoir Surveillance ] [ Pressure diffusion @model ]