Ratio of the variation of the field-average formation pressure in producers to the total field cumulative water injection Q_{WI} for the same time period T:
| (1) | {\rm PIR} = \frac{<p_e(t=T)>-<p_e(t=0)>}{Q_{WI}(t=T)} |
It measures how efficiently waterflood supports the pressure in producers and represents one of the key Waterflood Diagnostics.
See Also
Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Waterflood Diagnostics