Part of current Oil Reserves (OR) which is currently moving towards producing wells:
OR = Drainable Oil + Non-drainable oil
The Non-drainable Oil is a result of deviation from the current Field Development Plan (FDP) or mistakes in FDP itself, for example, the overestimation of OR.
The Drainable Oil is often split into profitable oil recovery and non-profitable oil recovery.
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Oil In Place (OIP)/ Oil Reserves (OR)
[ Hydrocarbon Reserves ] [ Gas reserves ]
[ Estimated Ultimate Oil Recovery (EUOR) ]
[ Profitable Oil Recovery ][ Non-profitable Oil Recovery]