Challenger Bumper Jar

Description:

The Challenger two-way bumper jar incorporates upwards hydraulic delay without a latch mechanism and manual bumping action downwards. This jar will allow the operator to apply variable impact in both the up and down directions. The bumper is intended for use in highly deviated or high friction wells, where conditions may prevent applying sufficient force to release a mechanical latch.

Benefits & Features:

The Jar is hydraulically controlled and jars upwards, with impact force controlled by the operator, the harder you pull, the harder it will hit (See specification, max pull during delay). Impact force is controlled by a metering device that ensures consistent delay times over the full range of operating temperatures.

Standard seals are suitable for use up to 275˚F (135˚C). Optional high temperature seal kits are available, suitable for service to 450˚F (230˚C).

Operation

Jarring Up
With the jar in the closed position, apply the desired overpull in excess of the free string weight, starting the hydraulic delay sequence. At the end of the hydraulic delay, the jar will release causing an upward impact force.

If necessary, lower the drill string sufficiently to close the jar, ready to jar up again.

Bumping Down
The jar must be in raised or open position then lower the drill string, allowing an downward impact force through the jar. 20 inches [510mm] of bumping stroke is available.

If necessary, lower the drill string sufficiently to determine the bottom of the bumping stroke.

Handling
To prevent unintentional firing during handling, the jar can be fitted with a safety clamp to keep the jar in the fully extended position. The safety clamp must remain installed until the jar is ready to run into the hole.

When preparing to run into the hole, connect the jar to the drill string and apply tension before removing the safety clamp.

When coming out of the hole, install the safety clamp while the jar is still under tension and fully extended.