Wireline Spring Jar

The DTI Spring Jar is a wireline jar designed for dependable, controlled upward jarring when required during wireline operations.

The DTI Spring Jar uses a reliable 'shifting key' latch principle, which ensures dependable operation with the minimum of maintenance. The latch key ties the upper mandrel to the lower spring mandrel, which is anchored within the jar by a pre-loaded spring.

When the DTI Spring Jar is pulled against a fixed object, the upper mandrel pulls against the pre-loaded spring a fixed distance, at which point the latch keys will release. When this happens, the upper mandrel will move rapidly upwards and strike an impact at the upper body part of the jar.

The release load is dependent upon the spring load setting which can be pre-configured prior to the operation. This load is adjustable over a given range (See load Setting Specifications).