Standing Oil Formation Volume Factor Calculator
Enter the required oil, gas, pressure, and temperature inputs for the Standing correlation. The calculator returns oil formation volume factor in reservoir volume per stock-tank volume.
Calculation context and source notes
Standing oil formation volume factor estimates the reservoir-barrel volume occupied by stock-tank oil and dissolved gas at reservoir pressure and temperature.
Use it in PVT screening, volumetric oil-in-place checks, material-balance inputs, and reservoir-to-surface oil volume conversions when a Standing-style correlation is appropriate.
Solves for
B_o (RB/STB)
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Formula, variables, and sourceRelated source-backed guides
Formula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns B_o = 1.34529 RB/STB. Defaults demonstrate the implementation; they are not recommended field values.
600
0.8
0.85
180
Input definitions
R_s
SCF/STBSolution Gas-Oil Ratio
gamma_g
fractionGas Specific Gravity
gamma_o
fractionOil Specific Gravity
t
°FTemperature
Output definitions
B_o
Oil Formation Volume Factor
F_standing_fvf
Standing Formation Volume Factor Correlating Parameter
R_s
Solution Gas-Oil Ratio
t
Temperature
Engineering use, assumptions, and limits
Use it in PVT screening, volumetric oil-in-place checks, material-balance inputs, and reservoir-to-surface oil volume conversions when a Standing-style correlation is appropriate.
Assumptions
- The oil system is within the empirical range represented by the Standing correlation.
- Pressure and temperature inputs are entered in the units required by the equation.
- Gas solubility, oil gravity, gas gravity, and temperature inputs are representative of the fluid sample being screened.
Limitations
- Does not replace laboratory PVT analysis or an equation-of-state model.
- May be unreliable for unusual crude compositions, volatile oils, condensates, or fluids outside the correlation range.
Common mistakes
- Using surface oil volume where reservoir oil volume is required.
- Mixing absolute and gauge pressure conventions.
- Applying one black-oil correlation without checking whether it fits the fluid family.
Frequently asked questions
What inputs does the Standing Oil Formation Volume Factor calculator need?
The calculation uses Solution Gas-Oil Ratio (R_s), Gas Specific Gravity (gamma_g), Oil Specific Gravity (gamma_o), Temperature (t). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is oil formation volume factor in RB/STB. The formula section shows the declared relationship, variables, and a reproducible default calculation.
What should I check before using the result?
Confirm the unit basis, source applicability, and input quality. Does not replace laboratory PVT analysis or an equation-of-state model. Using surface oil volume where reservoir oil volume is required.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Guo, B., Lyons, W.C. and Ghalambor, A. 2007. Petroleum Production Engineering: A Computer-Assisted Approach, Page 2/20.
Open source reference