SHORT STROKE ADJUSTABLE SPRING JAR - PHASE 1

Posted on 06 July 2015

The LiMAR Hydraulic & Adjustable Spring Jars are undergoing a transformation to further enhance performance in high debris environments and to reduce the overall jar lengths.


When a jar is fired there is an ingress of fluid and debris (if present) through the vent/exhaust ports. The inverted jar rod was designed to allow debris, due to gravity, to fall away from the latching mechanism. This debris can foul the latching mechanism and affect the jar’s operation. The performance of our jars to date has been exceptional, however, through continual improvement and evolution of the LiMAR range, we are always looking to offer our customers the best possible technical solutions.

For the first phase of testing, we looked at the two main dynamic components in an impacting toolstring – the Accelerator and the Power Jar.

Our initial tests were to determine if jar impacts were affected by shortening the jar stroke length. Several stroke lengths were tested and three optimised Accelerator settings were identified across the jar setting spectrum. Early testing soon identified a 50% reduction in jar stroke length, compared to that of a standard jar stroke length, with exceptional impact results achieved.

Compared to the existing Hydraulic and Adjustable Spring Jar, the new alternative configurations showed no decrease in impact. In fact, the data shows an increase in impact performance with the new harmonised Short Stroke Jar and Accelerator combination.

Phase 2 of our testing, which will include the debris tolerance test, will be commencing soon and we will provide information on this in due course.

For more information please contact sales

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