Instantaneous Gas-Oil Ratio Calculator
Enter the declared reservoir engineering inputs below to solve GOR. Variable definitions, units, the default calculation, and the available source trail are included on this page.
What is available in this record
This record provides the functioning calculator, formula, declared variables and units, a reproducible default result, and the available citation metadata. A separately written engineering interpretation has not yet been published for this calculation.
Formula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns GOR = 3,600 SCF/STB. Defaults demonstrate the implementation; they are not recommended field values.
600
0.05
0.4
2
0.02
1.2
0.005
Input definitions
R_s
SCF/STBSolution Gas-Oil Ratio
k_rg
dimensionlessRelative Gas Permeability
k_ro
dimensionlessRelative Oil Permeability
mu_o
cPOil Viscosity
mu_g
cPGas Viscosity
B_o
bbl/STBOil Formation Volume Factor
B_g
bbl/SCFGas Formation Volume Factor
Output definitions
GOR
Instantaneous Gas-Oil Ratio
R_s
Solution Gas-Oil Ratio
k_rg
Relative Gas Permeability
mu_o
Oil Viscosity
B_o
Oil Formation Volume Factor
k_ro
Relative Oil Permeability
mu_g
Gas Viscosity
B_g
Gas Formation Volume Factor
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.
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 1, Page 16.
Open source reference