DESCRIPTION:
The Hydraulic Jars allow jarring of the test string to aid in the freeing of downhole tools. The jar provides a temporary resistance that allows the drill pipe to be stretched. When the resistance is released, the drill pipe contracts to deliver the impact and freeing force.
APPLICATIONS:
- Freeing stuck section of the drill string in cased hole or open hole testing operations.
OPERATION:
Pulling on the drill string at surface will allow for tubing stretch and mandrelmovement upward as hydraulic fluid is restricted against the resistance valve and the lower jar body and lower portion of the string remain fixed.Once the travel in the hydraulic chamber is used up, the jar body will fire rapidly upwards to free the stuck zone below. The HJ is easily reset by putting weight on the drill string and filling up the hydraulic chamber for repeat jarring.
| STANDARD | SLIMHOLE | |
|---|---|---|
| O.D. | 5" | 3.125" |
| I.D. | 2.25" | 1.125" |
| Mandrel Torque | 2500 Ft lb | 2000 Ft lb |
| Body Joint Torque | 7000 Ft lb | 3500 Ft lb |
| High Pull | 50,000 lbs | 38,000 lbs |
| Time to Fire | 30-60 seconds | 30-60 seconds |
| Low Pull | 10,000 lbs | 10,000 lbs |
| Time to Fire | 2 to 5 minutes | 2 to 5 minutes |
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