Amott-Harvey Wettability Index Formula
Amott-Harvey Wettability Index calculates amott-harvey wettability index for rock properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (I_w, I_o) 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, I_AH equals 0.45 dimensionless.
0.65
0.20
Inputs
I_w
dimensionlessWater Spontaneous Imbibition Ratio
I_o
dimensionlessOil Spontaneous Imbibition Ratio
Outputs
I_AH
Amott-Harvey Wettability Index
I_w
Water Spontaneous Imbibition Ratio
I_o
Oil Spontaneous Imbibition Ratio
Source and review
reviewedWettability Profile of a Thick Carbonate Reservoir by the New Rise in Core Wettability Characterization Method, Ghedan, S. G., Canbaz, C. H., Boyd, D. A., Mani, G. M., Haggag, M. K. (2010)
Ghedan, S. G., Canbaz, C. H., Boyd, D. A., Mani, G. M., and Haggag, M. K. 2010. Wettability Profile of a Thick Carbonate Reservoir by the New Rise in Core Wettability Characterization Method. ADIPEC. SPE, Page 3.