Downhole · PCP
Production Tubing
The pipe that carries the produced fluid to surface. The stator is screwed onto its bottom.
What it does
Conveys oil, water and sand up the well and holds the stator in place.
Basics
| Connection | Threaded joints with collars |
| Inside it | The rod string |
| Risk | Back-off from reactive torque |
Common failures
- Holes from rod wear
- Back-off (tubing unscrews downhole)
- Thread leaks and corrosion
Troubleshooting
- Symptom
- Flow drops while pump torque looks normal
- Likely cause
- Tubing leak recirculating fluid
- What to check
- Pressure test the tubing
- Symptom
- Tubing found unscrewed when pulled
- Likely cause
- No torque anchor or anchor slipped
- What to check
- Anchor set procedure, thread make-up torque