Surface · Well Testing
Flowhead
The valve assembly installed on top of the test string at surface during a well test. Also called a surface test tree.
What it does
Carries the weight of the test string and gives access to the well: the flow wing sends the well to the test spread, the kill wing lets fluid be pumped in, and the swab valve lets wireline tools be run.
Basics
| Valves | Master, swab, flow wing and kill wing |
| Sits on | Top of the test string |
| Also called | Surface test tree |
Common failures
- Valve that no longer holds well pressure
Troubleshooting
- Symptom
- Pressure keeps rising downstream of a closed valve
- Likely cause
- Worn seat or seal
- What to check
- Close the next barrier, pressure test and repair before flowing again