Production EngineeringInjection Wells
Hall Plot Pressure-Time Increment Formula
Hall Plot Pressure-Time Increment calculates hall pressure-time increment for injection wells workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (P_iwf, P_avg, Delta_t) 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, Delta_H equals 15,000 psi-day.
P_iwfpsi
2500
P_avgpsi
2000
Delta_tday
30
Inputs
P_iwf
psiAverage Sandface Injection Pressure
P_avg
psiAverage Reservoir Pressure
Delta_t
dayInjection Days in Period
Outputs
Delta_H
psi-day
Hall Pressure-Time Increment
P_iwf
psi
Average Sandface Injection Pressure
P_avg
psi
Average Reservoir Pressure
Delta_t
day
Injection Days in Period
Source and review
reviewedHarmony Enterprise Hall plot theory, Equation 7 monthly pressure-integral simplification.
Source