Production EngineeringInjection Wells
Hall Plot Slope from Two Surveillance Points Formula
Hall Plot Slope from Two Surveillance Points calculates hall plot slope for injection wells workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (H_1, H_2, W_i1, W_i2) are known and the assumptions behind the cited injection wells 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, m_H equals 0.333333 psi-day/bbl.
H_1psi-day
90000
H_2psi-day
105000
W_i1bbl
100000
W_i2bbl
145000
Inputs
H_1
psi-dayFirst Cumulative Hall Integral
H_2
psi-daySecond Cumulative Hall Integral
W_i1
bblFirst Cumulative Water Injected
W_i2
bblSecond Cumulative Water Injected
Outputs
m_H
psi-day/bbl
Hall Plot Slope
H_2
psi-day
Second Cumulative Hall Integral
H_1
psi-day
First Cumulative Hall Integral
W_i2
bbl
Second Cumulative Water Injected
W_i1
bbl
First Cumulative Water Injected
Source and review
reviewedHarmony Enterprise Hall plot theory, Hall plot slope as an indicator of average well injectivity.
Source