Pump · ESP
Seal Section
The section between the pump and the motor, also called the protector. It isolates the motor oil from the well fluid.
What it does
Keeps well fluid out of the motor, equalizes motor pressure with the well, gives the motor oil room to expand with heat, and carries the pump thrust on its thrust bearing.
Basics
| Chambers | Labyrinth, bag, or combinations in series |
| Contains | Thrust bearing and mechanical seals |
| Practice | API RP 11S7 |
Common failures
- Well fluid entering the motor oil
- Thrust bearing failure
- Bag rupture
Troubleshooting
- Symptom
- Insulation resistance dropping over weeks
- Likely cause
- Fluid migrating through the seal into the motor
- What to check
- Trend insulation readings, plan pulling before a burn