Meyer Gardner Pirson Vertical Gas-Coning Critical Rate Formula
Meyer Gardner Pirson Vertical Gas-Coning Critical Rate calculates critical oil rate without gas coning for well performance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (rho_o, rho_g, r_e, r_w, h, h_p, mu_o, B_o, k_o) 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_o equals 9.566847 STB/day.
0.85
0.1
1000
0.328
50
20
2
1.2
100
Inputs
rho_o
g/ccOil Density
rho_g
g/ccGas Density
r_e
ftDrainage Radius
r_w
ftWellbore Radius
h
ftOil Column Thickness
h_p
ftPerforated Interval Thickness
mu_o
cPOil Viscosity
B_o
RB/STBOil Formation Volume Factor
k_o
mDEffective Oil Permeability
Outputs
q_o
Critical Oil Rate without Gas Coning
k_o
Effective Oil Permeability
h_p
Perforated Interval Thickness
mu_o
Oil Viscosity
Source and review
reviewedJoshi, S.D. 1991. Horizontal Well Technology, Chapter 8, Page 255.
Source