Description
In today’s Drilling applications longer reach Horizontal sections are becoming more popular. With that in mind it has also become more difficult to determine just how much pull the drilling jars are being subjected to. We are seeing more Drilling jars with damages due to being over pulled and no longer able to fire.
Challenger Downhole Tools has worked to help alleviate this situation by creating High Output Drilling Jar. The HO-HMJ (High Output-Hydraulic / Mechanical Drilling Jar) is capable of withstanding up to 50% greater pull during delay; this will help eliminate the damage to jars being over pulled and rendering them useless.
The HO-HMJ has 50% greater pulling power during delay than any other Drilling Jar of comparable size. This ability to pull harder during delay also will increase the impact of the jar once it does fire providing a significantly greater hitting force.
With longer reach horizontals being drilled and greater amounts of hole drag being created, the Challenger HO HMJ, (High Output-Hydraulic / Mechanical Drilling Jar) has been designed to function in these environments. The HO-HMJ is very effective in Horizontal applications providing Weight or Pull can be applied to the Drilling Jars.
Features & Benefits
- The Jar is normally operated in the latched position to reduce unexpected jarring while drilling, and eliminate movement between jar components to increase service life.
- The Jar operates with a simple up and down motion and is not affected by torque.
- Standard seals in the tool are effective to 250°F (120°C). The jar can be dressed with seals effective to 400°F (200°C) for hot hole environments. External sealing surfaces are tungsten carbide-coated to enhance wear and corrosion resistance.
- The Jar can be run in tension or in compression within the preset latch settings.
Operation
Jarring Up
- Jarring up is achieved by applying sufficient over pull to overcome the latch setting, which initiates the hydraulic time delay. During the time delay, the over pull at surface can be adjusted to vary the impact force.
- After impact, apply a down force sufficient to close jar and re-engage latch, then repeat the jarring cycle as required.
Jarring Down
- Jarring down is achieved by applying sufficient downward force to overcome the latch setting and pump open force. At that point, the Jar will release and jar downward.
- After impact, pick up the work string to re-engage the mechanical latch then repeat the jarring cycle as required.
Imperial
Nominal OD (inch) |
Length (ft) |
Thru Bore (inch) |
Approx. Weight (lbs) |
Pump Open Area (in2) |
Torsional Limit (ft lbs) |
Nominal Up Latch Setting (lbs) |
Nominal Down Latch Setting (lbs) |
Max Pull During Delay (lbs) |
Tensile Yeild (lbs) |
| 4.75 | 19.6 | 2.25 | 765 | 11.8 | 20,000 | 55,000 | 30,000 | 132,000 | 391,000 |
| 5.25 | 19.6 | 2.25 | 890 | 11.8 | 31,500 | 55,000 | 30,000 | 132,000 | 391,000 |
| 6.25 | 20.5 | 2.25 | 1,570 | 19.6 | 48,500 | 90,000 | 40,000 | 250,000 | 777,000 |
| 6.50 | 20.5 | 2.25 | 1,630 | 19.6 | 52,400 | 90,000 | 40,000 | 250,000 | 777,000 |
| 6.62 | 20.6 | 2.75 | 1,600 | 21.7 | 53,800 | 90,000 | 40,000 | 250,000 | 722,500 |
| 6.75 | 20.5 | 2.75 | 1,760 | 23.8 | 48,800 | 95,000 | 42,000 | 270,000 | 907,500 |
| 8.00 | 20.7 | 2.81 | 2,600 | 30.7 | 98,000 | 100,000 | 45,000 | 400,000 | 949,000 |
Metric
Nominal OD (inch) |
Length (m) |
Thru Bore |
Approx. Weight (kgs) |
Pump Open Area (mm2) |
Torsional Limit (N•m) |
Nominal Up Latch Setting (daN) |
Nominal Down Latch Setting (daN) |
Max Pull During Delay (daN) |
Tensile Yeild (daN) |
| 121 | 6.0 | 57.2 | 350 | 7 606 | 27 120 | 24 460 | 13 340 | 58 710 | 173 900 |
| 133 | 6.0 | 57.2 | 400 | 7,606 | 42,710 | 24,460 | 13,340 | 58,710 | 173,900 |
| 159 | 6.2 | 57.2 | 710 | 12,664 | 65,760 | 40,030 | 17,790 | 111,200 | 345,600 |
| 165 | 6.2 | 57.2 | 740 | 12,664 | 71,040 | 40,030 | 17,790 | 111,200 | 345,600 |
| 168 | 6.3 | 69.9 | 730 | 13,968 | 72,940 | 40,030 | 17,790 | 111,200 | 321,400 |
| 171 | 6.2 | 69.9 | 800 | 15,323 | 66,160 | 42,260 | 18,680 | 120,100 | 403,700 |
| 203 | 6.3 | 71.4 | 1,180 | 19,806 | 132,870 | 44,480 | 20,020 | 177,920 | 422,100 |