Coiled tubing · Intervention
Injector Head
The machine on top of the well that grips the coiled tubing with chains and pushes it in or pulls it out. A gooseneck on top guides the pipe from the reel.
What it does
Uses a hydraulic drive on gripper chains to run the string against well pressure and to carry its weight on the way out. Its base attaches to the pressure control stack.
Basics
| Grip | Opposed chain assemblies |
| Drive | Hydraulic |
| Guide | Gooseneck from reel to chains |
| Reads | Weight and depth at surface |
Common failures
- Chains slip on the pipe under high load
Troubleshooting
- Symptom
- Depth counter runs but weight does not change
- Likely cause
- Chains slipping
- What to check
- Increase traction pressure within limits, check gripper blocks for wear