Difference between cumulative water injection
Q_W^{\downarrow} and cumulative water production
Q_W^{\uparrow} normalized to the pore volume
V_{\rm phi}:
| {\rm NWR} = \frac { B_w \cdot ( Q_W^{\downarrow} - Q_W^{\uparrow} ) }{ V_{\rm phi} } |
See Also
Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Waterflood Diagnostics / Water Replenishment (WR)