Fracture Conductivity During Bilinear Flow Formula
Fracture Conductivity During Bilinear Flow calculates fracture conductivity for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (Q, B, mu, m_bf, h, phi, c_t, k) are known and the assumptions behind the cited pressure transient analysis 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, F_C equals 148,520.340625 mD*ft.
500
1.2
1.5
100
50
0.12
0.00001
0.1
Inputs
Q
STB/dayFlow rate
B
bbl/STBFormation volume factor
mu
cPFluid viscosity
m_bf
psi/cycleBilinear-flow buildup-test slope
h
ftFormation thickness
phi
fractionPorosity
c_t
1/psiTotal compressibility
k
mDReservoir permeability
Outputs
F_C
Fracture conductivity
Q
Flow rate
B
Formation volume factor
m_bf
Bilinear-flow buildup-test slope
h
Formation thickness
k
Reservoir permeability
Source and review
reviewedAhmed, T. and McKinney, P. D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 1, Page 95.
Source