Hydraulic Jar

Hydraulic Jar


The Hydraulic Jars allow jarring of the test string to aid in the freeing of down-hole tools. The Jar provides a temporary resistance that allows the drill pipe to be stretched. When the resistance is release, the drill pipe contracts to deliver the impact and freeing force.


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 Hydraulic Jar 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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