Ultimate Double Acting Hydraulic Drilling Jar
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Double Acting Hydraulic Drilling Jar
The Park City Double Acting Hydraulic Drilling Jar (HJDA) is a bi-directional drilling jar incorporating hydraulic delay without a latch mechanism. This jar will allow the operator to apply variable impact in both the up and down directions. The HJDA is intended for use in highly deviated or high friction wells, where conditions may prevent applying sufficient force to release a mechanical latch.
Features & Benefits
- The HJDA is hydraulically controlled and jars in both directions, with impact force controlled by the operator.
- Impact force is controlled by a metering device that ensures consistent delay times over the full range of operating temperatures.
- The HJDA operates via a simple up and down motion and is unaffected by right- or left-hand torque.
- Standard seals are suitable for use up to 250°F (120°C). Optional high temperature seal kits are available suitable for service to 400°F (200°C). External sealing surfaces are tungsten carbide-coated to enhance wear and corrosion resistance.
Operation
Jarring Up
- With the jar in the neutral 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 to the neutral position, ready to jar up again.
Jarring Down
- With the jar in the neutral position, lower the drill string to apply the desired down force, starting the hydraulic delay sequence. At the end of the hydraulic delay, the jar will release causing a downward impact force.
- If necessary, raise the drill string sufficiently to open the jar to the neutral position, ready to jar down again.
Handling
- To prevent unintentional tripping during handling, the HJDA is 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.
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Ultimate Double Acting Hydraulic Drilling Jar
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Technical Specifications
Imperial
| Nominal OD (inch) | Length (ft) | Thru Bore (inch) | Tensile Yield (lbs) | Torsional Limit (ft lbs) | Max Pull During Delay (lbs) | Free Stroke Up/Down (inch) | Total Stroke (inch) |
| 3.38 | 14.3 | 1.50 | 234 900 | 9 000 | 50 000 | 7.0 | 21.0 |
| 4.25 | 16.9 | 2.00 | 300 800 | 16 300 | 70 000 | 8.0 | 25.0 |
| 4.75 | 17.4 | 2.25 | 370 600 | 21 500 | 85 000 | 8.0 | 25.0 |
| 6.25 | 17.9 | 2.25 | 938 900 | 50 700 | 160 000 | 8.0 | 25.0 |
| 6.50 | 18.1 | 2.75 | 1 220 000 | 51 000 | 175 000 | 8.0 | 25.0 |
| 6.75 | 17.9 | 2.75 | 1 220 000 | 51 500 | 190 000 | 8.0 | 25.0 |
| 8.00 | 18.2 | 2.81 | 1 293 900 | 103 200 | 240 000 | 8.0 | 25.0 |
| 9.50 | 19.0 | 3.00 | 2 106 900 | 189 300 | 300 000 | 8.0 | 25.0 |
Metric
| Nominal OD (mm) | Length (m) | Thru Bore (mm) | Tensile Yield (daN) | Torsional Limit (Nm) | Max Pull During Delay (daN) | Free Stroke Up/Down (mm) | Total Stroke (mm) |
| 86 | 4.3 | 38 | 104 500 | 12 200 | 22 200 | 180 | 530 |
| 108 | 5.2 | 51 | 133 800 | 22 100 | 31 100 | 200 | 640 |
| 121 | 5.3 | 57 | 164 800 | 29 100 | 37 800 | 200 | 640 |
| 159 | 5.4 | 57 | 417 600 | 68 700 | 71 200 | 200 | 640 |
| 165 | 5.5 | 70 | 542 700 | 69 100 | 77 800 | 200 | 640 |
| 171 | 5.5 | 70 | 542 700 | 69 800 | 84 500 | 200 | 640 |
| 203 | 5.5 | 71 | 575 500 | 139 900 | 106 800 | 200 | 640 |
| 241 | 5.8 | 76 | 937 100 | 256 700 | 133 400 | 200 | 640 |
Specifications are based on as new condition and are subject to change without notice.
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