Reservoir EngineeringWaterflooding and EOR
In-Situ Combustion Water Production - Nelson and McNeil Formula
In-Situ Combustion Water Production - Nelson and McNeil calculates cumulative water production for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (V_r, phi, S_iw, S_fw) 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, W_p equals 58,185 bbl.
V_racre-ft
100
phifraction
0.25
S_iwfraction
0.55
S_fwfraction
0.25
Inputs
V_r
acre-ftVolume of Reservoir Burned
phi
fractionPorosity
S_iw
fractionInitial Water Saturation
S_fw
fractionWater Saturation After Burning
Outputs
W_p
bbl
Cumulative Water Production
V_r
acre-ft
Volume of Reservoir Burned
phi
fraction
Porosity
S_iw
fraction
Initial Water Saturation
S_fw
fraction
Water Saturation After Burning
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