Drilling Jar
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The ZSJ type drilling jar and ZSJ type drilling down jar can be used mutually or operated separately. The up jarring section uses a hydraulic mechanism that can adjust the faring force to elevate the load but will not exceed the maximum for the rated tool load. The down jarring section uses a mechanical friction mechanism to produce a jarring force that must be pre-adjusted prior to being placed in the downhole. Both are effective at keeping your drilling equipment from remaining in a stuck position.
Specifications| Parameters/ type | | | | | | ||
| | | | | | | ||
| OD(mm) | 203 | 197 | 178 | 160 | 146 | 121 | |
| ID(mm) | 71.4 | 71.4 | 70 | 57 | 57 | 51 | |
| Pull down overall length(mm) | up | 5515 | 5515 | 5424 | 5360 | 5730 | 5300 |
| down | 5250 | 5250 | 5215 | 5215 | 5000 | 4760 | |
| pull down stroke(mm) | up | 368 | 368 | 344 | 344 | 332 | 305 |
| down | 178 | 178 | 178 | 178 | 180 | 178 | |
| Thread conn. | 6 5/8REG | 6 5/8REG | NC50 | NC46 | 4 1/2FH | NC38 | |
| Max. tensile load(kN) | 2500 | 2500 | 2300 | 2200 | 2000 | 1400 | |
| Max. working torque(kN.m) | 20 | 18 | 15 | 15 | 15 | 13 | |
| Rated release force for up jar(kN) | 400-600 | 400-600 | 350-550 | 300-450 | 200-350 | 150-250 | |
| Max. up jarring released force (kN) | 750 | 750 | 550 | 550 | 450 | 270 | |
| Max. down jarring released force(kN) | 600 | 600 | 550 | 500 | 400 | 250 | |
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