Equivalent Steam Volume Injected - Myhill and Stegemeier Formula
Equivalent Steam Volume Injected - Myhill and Stegemeier calculates equivalent steam volume injected for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (C_w, T_sb, T_a, f_sb, L_vb, T_i, T_o, f_vdh, 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, W_s_eq equals 0.000003 bbl.
1
550
80
0.8
900
500
100
0.7
850
Inputs
C_w
BTU/lbm-FSpecific Heat Capacity of Water or Steam
T_sb
degFSteam Temperature at Boiler Outlet
T_a
degFAmbient Temperature
f_sb
fractionSteam Quality at Boiler Outlet
L_vb
BTU/lbmLatent Heat of Vaporization at Boiler Outlet
T_i
degFDownhole Steam Injection Temperature
T_o
degFInitial Reservoir or Reference Temperature
f_vdh
fractionDownhole Steam Quality
L_vdh
BTU/lbmDownhole Latent Heat of Vaporization
Outputs
W_s_eq
Equivalent Steam Volume Injected
C_w
Specific Heat Capacity of Water or Steam
f_sb
Steam Quality at Boiler Outlet
L_vb
Latent Heat of Vaporization at Boiler Outlet
f_vdh
Downhole Steam Quality
L_vdh
Downhole Latent Heat of Vaporization
Source and review
reviewedThermal Recovery, Prats, M. (1986)
Prats, M. 1986. Thermal Recovery. Society of Petroleum Engineers, Chapter 7, Page 78.
Source