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Challenger Bumper Jar

Home  ›  Products  ›  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.

 

Imperial

Nominal OD (inch)
Length (ft)
Thru Bore (inch)
Tensile Yield (lbs)
Torsional Yield (ft lbs)
Pump Open Area (in2)
Max Pull During Delay (lbs)
Free Up Stoke (inches)
Bumping Stroke (inches)
Total Stroke (inches)
4.75 16.1 2.25 351,900 15,000 11.8 85,000 5.9 19 29
6.25 17.1 2.25 803,400 41,000 19.6 160,000 6.4 20 30
6.50 17.1 2.25 803,400 46,000 19.6 160,000 5.9 20 30
6.75 17.1 2.75 860,500 41,000 23.8 190,000 5.9 20 30
8.00 17.8 2.88 883,300 78,000 30.7 240,000 5.9 20 30.5
9.00 17.8 2.88 916,900 128,000 33.2 240,000 5.8 20 30

Metric

Nominal OD (mm)
Length (m)
Thru Bore (mm)
Tensile Yield (daN)
Torsional Yield (N-m)
Pump Open Area (mm2)
Max Pull During Delay (daN)
Free Up Stoke (mm)
Bumping Stroke (mm)
Total Stroke (mm)
121 4.9 57.2 156 530 20 340 7 613 37 810 150 483 737
159 5.2 57.2 357 350 55 590 12 664 71 170 463 508 762
165 5.2 57.2 357 350 62 370 12 664 71 170 150 508 762
171 5.2 69.9 382 750 55 590 15 323 84 510 150 508 762
203 5.4 73.0 392 890 105 750 19 806 106 750 150 508 775
229 5.4 73.0 407 840 173 540 21 406 106 750 147 508 762

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