AJ Type Safety Joint
Use this table to set up and order the AJ Type Safety Joint at a glance. It lists torque directions (RH/LH), placement, release steps, and the OD/ID & thread specs to match your casing/tubing.
| Specification | Value |
|---|---|
| Service Scope | Drilling, fishing, repair, and testing operations |
| Protective Role | Provides a planned disconnect to protect the drill stem |
| Torque Direction | Transfers right-hand and left-hand torque downhole |
| Release Function | Enables quick disconnect to recover the upper string above a stuck point |
| Release Method | Apply programmed rotation and/or over-pull to activate release |
| Placement | Run above the BHA or above the fishing assembly |
| Operating Steps | Make up → run → (if needed) apply rotation/over-pull → release → pull upper string |
| Typical Scenarios | Stuck tool recovery, pack-off, test/fishing runs requiring fast release |
| Advantages | Cuts rig time in emergencies, reduces twist-off risk, maintains control |
| Connections | Box × pin per order (thread type/size as specified) |
| Planning Notes | Record release direction, over-pull values, and make-up torque in the job program |
| Compatibility | Match OD/ID limits and thread to the casing/tubing program |
| Reuse | Re-dress and re-make at surface per shop procedures |
| Limitations | Not a substitute for jars/bumper subs; use within a proper string design |
