Steady-State Five-Spot Steam-Drive Injection Rate Formula
Steady-State Five-Spot Steam-Drive Injection Rate calculates injection rate for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k, h, mu, A, r_w, P_i, P_b) 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, i equals 9,057.750955 BBL/d.
500
50
2
40
0.33
2500
1000
Inputs
k
mDPermeability
h
ftPay Zone Thickness
mu
cPViscosity
A
acreArea Per Pattern
r_w
ftWellbore Radius
P_i
psiInjection Pressure
P_b
psiBorehole Pressure
Outputs
i
Injection Rate
k
Permeability
h
Pay Zone Thickness
mu
Viscosity
A
Area Per Pattern
P_i
Injection Pressure
P_b
Borehole Pressure
Source and review
reviewedThermal Recovery Monograph Vol. 7, Pratts, M. (1986)
Pratts, M. 1986. Thermal Recovery Monograph Vol. 7. Society of Petroleum Engineers, Houston, Page 83.
Source