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