Cumulative Heat Injected for Steam Drive - Myhill and Stegemeier Formula
Cumulative Heat Injected for Steam Drive - Myhill and Stegemeier calculates heat injection rate for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (w_i, c_w, Delta_T, f_sdh, L_vdh) 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, Q_i equals 112,000,000 BTU/day.
100000
1
400
0.8
900
Inputs
w_i
lb/dayMass rate of steam injection
c_w
BTU/lb-KAverage specific heat of water
Delta_T
KTemperature differential
f_sdh
fractionSteam quality
L_vdh
BTU/lbLatent heat of steam
Outputs
Q_i
Heat injection rate
w_i
Mass rate of steam injection
c_w
Average specific heat of water
Delta_T
Temperature differential
f_sdh
Steam quality
L_vdh
Latent heat of steam
Source and review
reviewedThermal Recovery, Prats, M. (1986)
Prats, M. 1986. Thermal Recovery. Society of Petroleum Engineers, New York, Chapter 7, Page 76.
Source