The historical Production rate / Injection rate from/to the target pay maybe not accurate both due to metrological inaccuracy and thief water production/injection.

The ratio between the adjusted and historical Production rate / Injection rates called  Production/Injection Adjustments Coefficients: 

See Also

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing (WT) / Flowrate Testing / Flowrate / 

[ Production rate ][ Injection rate ]