Gas Well Tubing Performance
Spreadsheet
25 rows x 4 columns
| A | B | C | D | |
|---|---|---|---|---|
| 1 | Gas Well Tubing Performance | |||
| 2 | Gas & Well Properties | |||
| 3 | Gas Specific Gravity | 0.65 | dimensionless | |
| 4 | Wellhead Pressure (Pwh) | 500 | psia | |
| 5 | Temperature | 180 | degF | |
| 6 | Gas Viscosity | 0.015 | cP | |
| 7 | Z-factor | 0.9 | dimensionless | |
| 8 | TVD | 10000 | ft | |
| 9 | Pipe Roughness | 0.0006 | dimensionless | |
| 10 | ||||
| 11 | Tubing Sizes | 1.995 | 2.441 | 2.992 |
| 12 | (inches ID) | Small | Medium | Large |
| 13 | ||||
| 14 | Tubing Curves | |||
| 15 | Qg (mmscf/D) | Pwf 1.995" | Pwf 2.441" | Pwf 2.992" |
| 16 | 0.5 | 632.1602218 | 623.2193876 | 619.8574242 |
| 17 | 1 | 670.8842496 | 637.9320525 | 625.2973689 |
| 18 | 2 | 804.9540318 | 692.4159833 | 646.0188338 |
| 19 | 3 | 987.4079766 | 773.9690862 | 678.7593066 |
| 20 | 5 | 1420.005443 | 989.6842161 | 773.6447797 |
| 21 | 7 | 1890.596456 | 1244.29337 | 896.8917336 |
| 22 | 10 | 2622.914683 | 1659.695159 | 1113.950067 |
| 23 | ||||
| 24 | Reynolds Number Check | |||
| 25 | Re at 5 mmscf/D | 2181871.345 | 1783217.261 | 1454823.975 |
Description
Calculate tubing performance for a gas well using single-phase gas flow correlation. Compare bottomhole pressures at different gas rates and tubing sizes to identify the optimal tubing diameter. Smaller tubing increases friction but maintains velocity above liquid loading threshold.
Liquid loading: If gas velocity drops below the Turner critical rate, liquids accumulate in the wellbore, killing the well. Larger tubing = lower velocity = higher loading risk.
Workflow
- Inputs: Gas properties (SG, Z, μg), wellhead conditions (Pwh, T), tubing geometry (ID, TVD)
- Step 1: Compute bottomhole pressure at several gas rates for base tubing size
- Step 2: Repeat for alternative tubing sizes
- Step 3: Compare pressure drops — identify optimal size balancing friction vs loading
- Output: Tubing performance curves at three diameters
How to use this blueprint
- In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
- Search for Gas Well Tubing Performance
- 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.