Safety Joint

Safety Joint


The Safety Joint provides a means for releasing from a set of tools that are stuck in the hole. The Safety Joint is released with left hand rotation with about 20% of the torque required to break other tool joints in the string. The Safety Joint requires 5 ½ to 6 turns of left hand rotation to release.


Pulling on the drill string at surface will allow for tubing stretch and mandrel movement upward as hydraulic fluid is restricted against the resistance valve and the lower jar body and lower portion of the string remain fixed. Once the travel in the hydraulic chamber is used up, the jar body will fire rapidly upwards to free the stuck zone below. The HJ is easily reset by putting weight on the drill string and filling up the hydraulic chamber for repeat jarring.


Freeing stuck section of the drill string in cased hole or open hole testing operations.

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