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RA Marker Sub
Description
The Radioactive Marker Sub is a short joint of pipe designed to hold a radioactive “pip-tag”
for accurately placing downhole tools and tubing conveyed perforating guns (TCP) on depth.
After running in-hole using the driller’s depth, a gamma ray correlation device is run through
tubing to detect the actual depth of the pip-tag. The final setting depth of the tools or TCP
guns can be adjusted based on the actual depth reading versus the desired depth.
Features
Highly visible to logging tools that detect gamma rays- Radioactive marker securely held inside sub with set screws
- Full opening
- Guaranteed recovery of radioactive source
Applications
- TCP depth correlation
- TCP under-balancing
- Depth correlation of down hole tools and TCP guns
- TCP shoot and pull
