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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) ]

Non-drainable Oil]

[ Profitable Oil Recovery ][ Non-profitable Oil Recovery]

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