Reservoir Wettability Characterization Rise-in-Core Method Formula
Reservoir Wettability Characterization Rise-in-Core Method calculates cosine of liquid-liquid-rock contact angle for rock properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (mu_1, mu_2, rho_1, rho_2, m, t, C, gamma_L2L1) are known and the assumptions behind the cited rock properties 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, cos_theta_12 equals 0.177083 dimensionless.
2
1
0.8
1
5
10
1
30
Inputs
mu_1
cPOil Phase Viscosity
mu_2
cPWater Phase Viscosity
rho_1
g/cm^3Oil Phase Density
rho_2
g/cm^3Water Phase Density
m
gMass of Fluid Penetrated into Porous Rock
t
minElapsed Rise-in-Core Time
C
dimensionlessCharacteristic Constant of Porous Rock
gamma_L2L1
dyn/cmInterfacial Tension between Water and Oil Phases
Outputs
cos_theta_12
Cosine of Liquid-Liquid-Rock Contact Angle
theta_12
Liquid-Liquid-Rock Contact Angle
mu_1
Oil Phase Viscosity
mu_2
Water Phase Viscosity
gamma_L2L1
Interfacial Tension between Water and Oil Phases
C
Characteristic Constant of Porous Rock
t
Elapsed Rise-in-Core Time
Source and review
reviewedU.S. Patent No. 8,768,628, Ghedan, S., Canbaz, C. H. (2014)
Ghedan, S. and Canbaz, C. H. 2014. U.S. Patent No. 8,768,628. Washington, DC: U.S. Patent and Trademark Office, Page 5.