Hoyland Papatzacos Skjaeveland Isotropic Vertical Well Critical Rate Formula
Hoyland Papatzacos Skjaeveland Isotropic Vertical Well Critical Rate calculates critical oil rate for well performance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (rho_w, rho_o, k_o, B_o, mu_o, h, h_p, r_e) are known and the assumptions behind the cited well performance 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_oc equals 76.673282 m^3/day.
1000
850
100
1.2
2
50
20
500
Inputs
rho_w
kg/m^3Water Density
rho_o
kg/m^3Oil Density
k_o
mDEffective Oil Permeability
B_o
RB/STBOil Formation Volume Factor
mu_o
cPOil Viscosity
h
mOil Column Thickness
h_p
mPerforated Interval
r_e
mDrainage Radius Used by the Correlation
Outputs
Q_oc
Critical Oil Rate
k_o
Effective Oil Permeability
mu_o
Oil Viscosity
B_o
Oil Formation Volume Factor
Source and review
reviewedJoshi, S.D. 1991. Horizontal Well Technology, Page 257; Hoyland, Papatzacos, and Skjaeveland vertical-well critical-rate correlation.
Source