Reservoir EngineeringWaterflooding and EOR
Effective Apparent Transmissivity Formula
Effective Apparent Transmissivity calculates effective apparent transmissivity for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k_ai, h_a, mu_ai) 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, T_ai equals 180,000 mD*ft/cP.
k_aimD
120
h_aft
60
mu_aicP
0.04
Inputs
k_ai
mDEffective permeability to steam
h_a
ftNet thickness of steam zone
mu_ai
cPApparent viscosity of steam
Outputs
T_ai
mD*ft/cP
Effective apparent transmissivity
k_ai
mD
Effective permeability to steam
h_a
ft
Net thickness of steam zone
mu_ai
cP
Apparent viscosity of steam
Source and review
reviewedThermal Recovery, Prats, M. (1986)
Prats, M. 1986. Thermal Recovery. Society of Petroleum Engineers, New York, Chapter 12, Page 167.
Source