Calculators
Predictive IPR
Forecast well productivity and inflow performance
The Predictive IPR calculator forecasts well productivity changes when operating conditions change, such as lowering the pump or increasing drawdown.
Inputs
IPR (Current Conditions)
| Field | Description |
|---|---|
| Pump TVD (ftKB) | True vertical depth of pump |
| Bottom Perf TVD (ftKB) | TVD of bottom perforation |
| Water Spec. Gravity | Water specific gravity |
| Oil API Gravity | Oil gravity in API degrees |
| Fluid Above Pump Static (ft) | Static fluid level above pump |
| Shut-in Csg. Pressure Static (psi) | Shut-in casing pressure |
| Fluid Above Pump Producing (ft) | Producing fluid level |
| Csg. Pressure Producing (psi) | Producing casing pressure |
| Daily Oil (bbl/day) | Current oil production rate |
| Daily Water (bbl/day) | Current water production rate |
| Daily Gas (mscf/day) | Current gas production rate |
Target (New Conditions)
| Field | Description |
|---|---|
| Fluid Above Pump Producing (ft) | Target fluid level |
| Csg. Pressure Producing (psi) | Target casing pressure |
| Pump TVD (ftKB) | Target pump depth |
Reservoir
| Field | Description |
|---|---|
| Cumulative Probability for Analysis | P10/P50/P90 or calculated |
| Initial Res. Pressure (psi) | Initial reservoir pressure |
Outputs
Daily Production Changes
- Daily Oil Increase (bbl/day)
- Daily Water Increase (bbl/day)
- Daily Gas Increase (mscf/day)
Total Daily Production
- Daily Oil, Water, Gas, and Liquid totals at target conditions
Reservoir State & Pressure
- Dimensionless Oil Recovery
- Calculated and estimated reservoir pressures (P10/P50/P90)
- Well Flowing Pressure (Pwf)
IPR Calculation Results
Table showing Pwf vs. Oil Rate, Water Rate, and Gross Rate relationships.
Use Cases
- Evaluate production increase from lowering pump
- Assess impact of increasing drawdown
- Predict rates at different operating conditions
- Estimate reservoir pressure from production data