Recovery Factor
Percentage of oil in place that can actually be produced.
Formula
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Example
N_p=10 MM, OOIP=30 MM: RF = 33%
How it works
Recovery factor tells you what fraction of the original oil in the reservoir has been, or is expected to be, extracted to the surface. It works by comparing produced or recoverable oil to the total oil originally in place, then converting that fraction into a percentage. A higher recovery factor usually reflects better reservoir drive, improved well performance, or the use of enhanced recovery methods, while a low value means much of the oil remains unrecovered in the reservoir.
When to use it
Use this when evaluating reservoir performance, comparing different fields, or estimating how much of a reservoir’s oil can realistically be produced. It is also useful in reserve studies and in judging the impact of primary, secondary, or enhanced oil recovery methods.
Worked example, step by step
Step 1: Identify the values N_p = 18 million barrels OOIP = 60 million barrels Step 2: Substitute into the formula RF = (N_p / OOIP) × 100 RF = (18 / 60) × 100 Step 3: Calculate the fraction 18 / 60 = 0.30 Step 4: Convert to a percentage RF = 0.30 × 100 = 30% Final answer: The recovery factor is 30%.
Common mistakes to avoid
- Using oil produced to date when the problem asks for recoverable oil, or vice versa
- Forgetting to multiply by 100, which leaves the answer as a decimal instead of a percentage
- Mixing units for N_p and OOIP, such as barrels and million barrels, without converting them consistently
Did You Know?
Primary recovery often leaves two-thirds of the oil underground, which is why enhanced recovery matters.
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