Ratio of the variation of the field-average formation pressure in producers to the total field cumulative water injection Q_{WI} for the same period of time \delta t:
| (1) | {\rm RIR}(\delta t) = \frac{ \left<p_e(t+\delta t) \right>_{\rm PROD} - \left<p_e(t)\right>_{\rm PROD}}{Q^{\downarrow}_{WI}(t+\delta t) - Q^{\downarrow}_{WI}(t) } |
It normally makes sense for the matured reservoirs with pressure depletion and indicates how efficiently waterflood supports the recovery of formation pressure in producers.
It represents one of the key Waterflood Diagnostics.
See Also
Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Waterflood Diagnostics