Fetkovich IPR Curve
Spreadsheet
26 rows x 4 columns
| A | B | C | D | |
|---|---|---|---|---|
| 1 | Fetkovich IPR Curve | |||
| 2 | Inputs | |||
| 3 | Reservoir Pressure | 3000 | psia | |
| 4 | Performance Coefficient (C) | 0.0015 | STB/(d·psi^2n) | |
| 5 | Flow Exponent (n) | 0.85 | dimensionless | |
| 6 | ||||
| 7 | Maximum Flow Rate | |||
| 8 | AOF (Qmax at Pwf=0) | 1222.355109 | STB/d | |
| 9 | ||||
| 10 | IPR Curve Construction | |||
| 11 | Pwf (psia) | q (STB/d) | Pwf/Pres | q/qmax |
| 12 | 3000 | 0 | 1 | 0 |
| 13 | 2700 | 297.94627 | 0.9 | 0.2437477193 |
| 14 | 2400 | 512.9257684 | 0.8 | 0.4196209142 |
| 15 | 2100 | 689.6552423 | 0.7 | 0.5642020368 |
| 16 | 1800 | 836.4700007 | 0.6 | 0.684310144 |
| 17 | 1500 | 957.1928943 | 0.5 | 0.7830726825 |
| 18 | 1200 | 1053.985862 | 0.4 | 0.8622583191 |
| 19 | 900 | 1128.190856 | 0.3 | 0.9229648961 |
| 20 | 600 | 1180.668401 | 0.2 | 0.9658964015 |
| 21 | 300 | 1211.957268 | 0.1 | 0.9914936004 |
| 22 | 0 | 1222.355109 | 0 | 1 |
| 23 | ||||
| 24 | Summary | |||
| 25 | Operating Point (Pwf=1500) | 957.1928943 | STB/d | |
| 26 | Drawdown at Operating | 1500 | psi |
Description
Construct an IPR curve using the Fetkovich backpressure equation. This empirical method works for both single-phase and two-phase flow by fitting well test data to Qo = C(Pr² - Pwf²)ⁿ.
Key Considerations:
- Flow exponent n ranges from 0.5 (turbulent) to 1.0 (laminar)
- Typical values are 0.7-0.9 for solution gas drive reservoirs
- C and n are determined from multi-rate well test data
- AOF (Absolute Open Flow) is the theoretical maximum rate at Pwf = 0
How to use this blueprint
- In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
- Search for Fetkovich IPR Curve
- Click on the blueprint to preview the spreadsheet template
- Click Insert to place it into your worksheet. Modify the input values to match your data.