Formation Fluid Compressibility - Acidizing Formula
Formation Fluid Compressibility - Acidizing calculates formation fluid compressibility for hydraulic fracturing workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (S_o, S_w, S_g, K_o, K_w, K_g) are known and the assumptions behind the cited hydraulic fracturing 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, K_fl equals 0.000017 psi^-1.
0.7
0.2
0.1
0.000012
0.000003
0.00008
Inputs
S_o
fractionOil Saturation Fraction
S_w
fractionWater Saturation Fraction
S_g
fractionGas Saturation Fraction
K_o
psi^-1Oil Isothermal Compressibility
K_w
psi^-1Water Isothermal Compressibility
K_g
psi^-1Gas Isothermal Compressibility
Outputs
K_fl
Formation Fluid Compressibility
K_o
Oil Isothermal Compressibility
K_w
Water Isothermal Compressibility
K_g
Gas Isothermal Compressibility
Source and review
reviewedWilliams, B.B., Gidley, J.L. and Schechter, R.S. 1979. Acidizing Fundamentals. Henry L. Doherty Memorial Fund of AIME, Society of Petroleum Engineers of AIME, Page 56.
Source