Critical Rate for Horizontal Wells in Edge-Water Drive Reservoirs Formula
Critical Rate for Horizontal Wells in Edge-Water Drive Reservoirs calculates critical oil rate for well performance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (e1, e2, e3, e4, Delta_rho, h, L, x_e, k_h, k_v, mu_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 8.015066 STB/day.
0.023
0.0013
0.022
0.0013
0.2
50
1000
500
10
5
1
Inputs
e1
dimensionlessEmpirical Constant for c₁
e2
dimensionlessEmpirical Constant for c₂
e3
dimensionlessEmpirical Constant for c₃
e4
dimensionlessEmpirical Constant for c₄
Delta_rho
g/ccDensity Difference Between Water and Oil
h
ftPay Zone Thickness
L
ftLength of Horizontal Well
x_e
ftDistance to Constant Pressure Boundary
k_h
mDHorizontal Permeability
k_v
mDVertical Permeability
mu_o
cPOil Viscosity
Outputs
c_1
Dimensionless Constant c₁
c_2
Dimensionless Constant c₂
c_3
Dimensionless Constant c₃
c_4
Dimensionless Constant c₄
q_c
Critical Rate Component
q_o
Critical Oil Rate
z_c
Critical Coning Height
Source and review
reviewedAhmed, T., McKinney, P.D. Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.
Source