Skin Damage Impact on Productivity
Spreadsheet
27 rows x 6 columns
| A | B | C | D | E | F | |
|---|---|---|---|---|---|---|
| 1 | Skin Damage Impact on Productivity | |||||
| 2 | Rock & Fluid Properties | |||||
| 3 | Permeability (k) | 50 | mD | |||
| 4 | Net Pay (h) | 30 | ft | |||
| 5 | Oil FVF (Bo) | 1.25 | bbl/STB | |||
| 6 | Oil Viscosity (μo) | 1.5 | cP | |||
| 7 | Drainage Radius (re) | 1000 | ft | |||
| 8 | Wellbore Radius (rw) | 0.354 | ft | |||
| 9 | Reservoir Pressure (Pr) | 3500 | psia | |||
| 10 | Bubble Point (Pb) | 3000 | psia | |||
| 11 | ||||||
| 12 | Skin Values | -2 | 0 | 5 | 10 | 20 |
| 13 | PI (bbl/D/psi) | 1.090355934 | 0.787319924 | 0.4645476493 | 0.3294749935 | 0.208327617 |
| 14 | AOF (bbl/D) | 2362.437856 | 1705.859835 | 1006.519907 | 713.862486 | 451.3765035 |
| 15 | ||||||
| 16 | IPR at Pwf = 2000 psia | |||||
| 17 | Rate (bbl/D) | 1473.999688 | 1064.339897 | 627.9996 | 445.4013802 | 281.6280748 |
| 18 | Rate vs S=0 (%) | 38.48956445 | 0 | -40.99633005 | -58.15233636 | -73.5396488 |
| 19 | ||||||
| 20 | IPR Curves (S=0 reference) | |||||
| 21 | Pwf (psia) | S=-2 | S=0 | S=5 | S=10 | S=20 |
| 22 | 3500 | 0 | 0 | 0 | 0 | 0 |
| 23 | 3000 | 545.1779668 | 393.659962 | 232.2738247 | 164.7374968 | 104.1638085 |
| 24 | 2500 | 1049.97238 | 758.1599268 | 447.3421808 | 317.272216 | 200.6117793 |
| 25 | 2000 | 1473.999688 | 1064.339897 | 627.9996 | 445.4013802 | 281.6280748 |
| 26 | 1000 | 2079.752984 | 1501.739855 | 886.0816275 | 628.4430432 | 397.3656398 |
| 27 | 0 | 2362.437856 | 1705.859835 | 1006.519907 | 713.862486 | 451.3765035 |
Description
Quantify how skin factor affects well productivity by computing PI and IPR curves at five skin values: stimulated (S=-2), ideal (S=0), mild damage (S=5), moderate (S=10), and severe (S=20). Shows the production rate gain from stimulation or the cost of leaving damage untreated.
Decision support: Compare rates at the same Pwf across skin values to estimate stimulation benefit in bbl/D.
Workflow
- Inputs: Rock/fluid properties (k, h, Bo, μo, re, rw), reservoir conditions (Pr, Pb)
- Step 1: Compute PI at each skin value using PSS PI equation
- Step 2: Generate IPR curve (Vogel) for each skin
- Step 3: Compare rates at a common Pwf and compute effective wellbore radius
- Output: Multi-skin IPR comparison table with rate uplift analysis
How to use this blueprint
- In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
- Search for Skin Damage Impact on Productivity
- 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.