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To run and retrieve subsurface tools.
JUSs are made up of nine components:
2. Core Spring
4. Dog Spring
7. S Core
8. Shear Pin Sub
9. Shear Pin Cover
Used when there is a need to jar down to shear off of a subsurface tool and/or fish when a jar up tool is not desired.
The core may be easily changed in the field to allow for a deeper or shallower reach depending on application. The JUS pulling tool is able to be turned into a JDC by simply changing
the fishneck and adding a core cap.
Ensure the proper core is installed so as the tool can properly be sheared, the improper core may result in the inability to release the subsurface tool and/or fish.
Care should be taken to inspect the dogs, skirt, and fishneck for damage such as metal . fatigue, cracking , or deformity of the metal.