Reservoir EngineeringFluid Flow in Porous Media
Drainage Radius from Area Formula
Drainage Radius from Area calculates drainage radius for fluid flow in porous media workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (A) are known and the assumptions behind the cited fluid flow in porous media 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, r_e equals 744.73025 ft.
Aacre
40
Inputs
A
acreDrainage Area
Outputs
r_e
ft
Drainage Radius
A
acre
Drainage Area
Source and review
reviewedAAPG Wiki. Fluid flow fundamentals, radius of drainage expression.
Source