Oil Volume at Breakthrough - Craig, Geffen, and Morse Formula
Oil Volume at Breakthrough - Craig, Geffen, and Morse calculates oil volume at breakthrough for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (PV, E_as_bt, S_wbt_av, S_wi) are known and the assumptions behind the cited waterflooding and eor 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, O_bt equals 180,000 bbl.
1000000
0.6
0.55
0.25
Inputs
PV
bblPore Volume
E_as_bt
fractionAreal Sweep Efficiency at Breakthrough
S_wbt_av
fractionAverage Water Saturation at Breakthrough
S_wi
fractionInitial Water Saturation
Outputs
O_bt
Oil Volume at Breakthrough
PV
Pore Volume
E_as_bt
Areal Sweep Efficiency at Breakthrough
S_wbt_av
Average Water Saturation at Breakthrough
S_wi
Initial Water Saturation
Source and review
reviewedEnhanced Recovery, Ehrlich, R. (2016)
Ehrlich, R. 2016. Enhanced Recovery, PTE 531 Oil Recovery, University of Southern California Lecture Notes.
Source