Workover · Intervention
Fishing Tools
Tools run to recover junk, debris or a lost piece of equipment, the fish, from the well.
What it does
An overshot grips the outside of the fish and a spear the inside; jars deliver impact loads to free it; an impression block shows the shape of its top; a junk basket picks up debris from the bottom.
Basics
| Outside catch | Overshot |
| Inside catch | Spear |
| Impact | Jars |
| Diagnostic | Impression block |
| Debris | Junk basket |
Common failures
- Fish not caught because its top is unknown
Troubleshooting
- Symptom
- Tool reaches the fish but does not latch
- Likely cause
- Unknown shape or size of the fish top
- What to check
- Run an impression block, then choose the overshot or spear