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How It Works
The oil recovery factor (ORF) is simply recoverable oil divided by total oil in place. It tells engineers what fraction of a reservoir's petroleum can actually be brought to the surface. Typical values range from 5-15% for primary depletion up to 60%+ when enhanced oil recovery (EOR) methods such as steam injection or CO₂ flooding are used.
Example Problem
A reservoir contains an estimated 500 million barrels of oil in place (EIPO). Engineering studies predict 175 million barrels can be recovered (ERO) using water-flood. What is the recovery factor?
- ORF = ERO / EIPO = 175 / 500 = 0.35 (35%)
A 35% recovery factor is typical for secondary water-flood operations. Adding a CO₂ miscible flood could push recovery above 50%.
Frequently Asked Questions
What is a good oil recovery factor?
Primary recovery typically yields 5-15%. Water or gas injection (secondary recovery) raises it to 15-40%. Enhanced methods such as thermal, chemical, or miscible flooding can push recovery to 60% or higher in favorable reservoirs.
How is oil in place estimated?
Geologists combine seismic surveys, well logs, and core samples to estimate reservoir volume, porosity, and oil saturation. The volumetric method multiplies rock volume by porosity, net-to-gross ratio, and oil saturation, then adjusts for formation volume factor.
What is enhanced oil recovery (EOR)?
EOR refers to techniques that go beyond water or gas injection to mobilize trapped oil. Common methods include steam injection (thermal), polymer or surfactant flooding (chemical), and CO₂ miscible flooding. EOR can add 10-30 percentage points to a reservoir's recovery factor.
What units are used for oil volume?
The petroleum industry reports oil in barrels (1 barrel = 42 US gallons or about 0.159 m³). This calculator supports barrels, cubic meters, liters, gallons, and other volume units with automatic conversion.
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