Downhole · Completion
Perforations
Tunnels shot through the casing and cement into the reservoir rock so oil and gas can flow into the well.
What it does
Shaped charges in a gun are run on wireline, tubing or coiled tubing and fired at the target depth. Acid may follow to clean debris out of the tunnels. The cement bond is checked before perforating.
Basics
| Charges | Shaped charges in a perforating gun |
| Conveyed by | Wireline, tubing or coiled tubing |
| Checked before | Cement bond log |
Common failures
- Tunnels plugged with debris, low inflow
Troubleshooting
- Symptom
- Lower rate than expected after perforating
- Likely cause
- Debris or damage in the tunnels
- What to check
- Review the job, consider acid cleanup