Production EngineeringInjection Wells
Hall Injectivity Change Ratio from Slopes Formula
Hall Injectivity Change Ratio from Slopes calculates hall injectivity coefficient ratio for injection wells workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (m_base, m_new) 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, R_C equals 0.666667 fraction.
m_basepsi-day/bbl
0.3333333333333333
m_newpsi-day/bbl
0.5
Inputs
m_base
psi-day/bblBaseline Hall Plot Slope
m_new
psi-day/bblNew Hall Plot Slope
Outputs
R_C
fraction
Hall Injectivity Coefficient Ratio
m_base
psi-day/bbl
Baseline Hall Plot Slope
m_new
psi-day/bbl
New Hall Plot Slope
Source and review
reviewedHarmony Enterprise Hall plot theory, slope as 1/C and slope changes as indicators of changed injection conditions.
Source