In-Situ Combustion Oil Production - Nelson and McNeil Formula
In-Situ Combustion Oil Production - Nelson and McNeil calculates cumulative oil production for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (V_r, S_i, S_f, V_p, phi) 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, N_p equals 107,836.2 bbl.
100
0.65
0.25
160
0.25
Inputs
V_r
acre-ftVolume of Reservoir Burned
S_i
fractionInitial Oil Saturation
S_f
fractionOil Saturation After Combustion
V_p
acre-ftPattern Volume
phi
fractionPorosity
Outputs
N_p
Cumulative Oil Production
phi
Porosity
V_p
Pattern Volume
V_r
Volume of Reservoir Burned
S_i
Initial Oil Saturation
S_f
Oil Saturation After Combustion
Source and review
reviewedEnhanced Oil Recovery, Green, D.W., Willhite, G.P.
Green, D.W. and Willhite, G.P. Enhanced Oil Recovery, Page 395.
Source