Jars and Safety Joints

Hydraulic Jars

The hydraulic jar tool (JAR) is used if a packer or guns become stuck. The JAR can be used to provide an upward shock to help pull the tools loose. The tool comprises two parts: a housing connected to the free tools and a spline mandrel attached to the stuck tools. The housing can move up and down the mandrel.

Safety Joints

The safety joint (SJB) allows quick release of the test string if the string below the packer becomes stuck. The tool has a coarse thread to carry the string load and allow easy disengagement and re-engagement. The SJB is typically positioned on top of the packer and made up to the same torque as the other tools in the string.

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