Dimensionless Air Injection Rate for In-Situ Combustion Formula
Dimensionless Air Injection Rate for In-Situ Combustion calculates dimensionless air injection rate for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (i_a, L, h, u_min) are known and the assumptions behind the cited waterflooding and eor relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, i_D equals 0.2 dimensionless.
10000
500
50
2
Inputs
i_a
ft^3/dayAir injection rate
L
ftInjector-producer pattern length
h
ftFormation thickness
u_min
ft/dayMinimum linear air-front velocity
Outputs
i_D
Dimensionless air injection rate
i_a
Air injection rate
L
Injector-producer pattern length
h
Formation thickness
u_min
Minimum linear air-front velocity
Source and review
reviewedThermal Recovery, Prats, M. (1986)
Prats, M. 1986. Thermal Recovery. Society of Petroleum Engineers, New York, Chapter 8, Page 100.
Source