Reservoir EngineeringWaterflooding and EOR
Fraction of Injected Heat Remaining in Reservoir Formula
Fraction of Injected Heat Remaining in Reservoir calculates fraction of injected heat remaining in reservoir for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (Q, Q_i) 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, E_h equals 0.6 fraction.
QBTU
600000
Q_iBTU
1000000
Inputs
Q
BTUTotal heat remaining in reservoir
Q_i
BTUTotal heat injected
Outputs
E_h
fraction
Fraction of injected heat remaining in reservoir
Q
BTU
Total heat remaining in reservoir
Q_i
BTU
Total heat injected
Source and review
reviewedThermal Recovery, Prats, M. (1986)
Prats, M. 1986. Thermal Recovery. Society of Petroleum Engineers, New York, Chapter 5, Page 44.
Source