Hydraulic double acting jars

The SOKOL Drilling motors and tools Hydraulic Double Acting Jar is hydraulically controlled and works in both directions, with impact force controlled by the operator. The jar does not incorporate a mechanical section. Up jarring force is controlled by the amount of the drill string tension during the hydraulic delay, and down jarring force — by the slack of weight during the hydraulic delay.

The SOKOL Hydraulic Double Acting Jar is operated by a simple up and down motion and is unaffected by right- or left-hand torque. Standard seals are suitable for use up to 120°C. Optional high temperature seal kits are available suitable for service up to 200°C. External sealing surfaces are tungsten carbide-coated to enhance wear and corrosion resistance.

Technical specification

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)
4.75 22.0 2.25 482 000 21 500 132 000 8.0 25.0
6.50 23.1 2.75 1 220 000 51 000 275 000 8.0 25.0
6.75 22.7 2.75 1 237 000 63 300 290 000 8.0 25.0
7.00 22.7 2.75 1 237 000 67 800 290 000 8.0 25.0
8.00 23.2 2.81 1 472 000 103 200 400 000 8.0 25.0
9.50 24.1 3.00 2 550 000 200 000 550 000 8.0 25.0
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