Hydraulic Fishing Jar

The Wenzel Downhole Tools Hydraulic Jar (HJ) is a single acting jar designed primarily for fishing applications, jarring in the upward direction.   Hydraulically operated, with impact force controlled by the operator, the HJ is ideally suited for fishing, coring, milling or other downhole applications.

  • The HJ is hydraulically controlled and jars in the up direction, 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.
  • A long splined mandrel ensures the jar is not affected by torsional forces.  These splines are sealed and lubricated to minimize friction and provide long wear life.
  • While this jar is designed to be rugged enough for drilling applications, it is intended for fishing, coring, and milling applications.
  • A free stroke of 4″ to 6″ (depending on tool size) provides an impact force to the stuck point several times higher than the overpull force applied to the jar.
  • 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, and 450°F (230°C) for extreme
    temperature environments. External sealing surfaces are tungsten carbide-coated to enhance
    wear and corrosion resistance.

Jarring Up

  • The Hydraulic Fishing/Drilling Jar should be run in the hole in the open position.
  • Tool is activated by applying upward pull from the closed position.
  • The amount of upward impact force can be changed by varying the amount of overpull applied at surface.  See the specification table for the maximum pull during delay.
  • When upward overpull has been applied, the jar will fire after a timed delay. The delay is reduced as upward force is increased.
  • After the jar strikes an upward blow, re-setting is quickly accomplished by lowering the drill string until the jar is in the closed position.

Imperial

HJ Type Nominal OD
(inch)		 Length
(ft)		 Thru Bore
(inch)		 Tensile Yield
(lbs)		 Torsional Limit
(ft-lbs)		 Max Pull During Delay
(lbs)		 Free Stroke
(inch)		 Total Stroke
(inch)
Standard 3.12 9.5 1.00 198 000 6 660 41 000 7.0 11.0
Standard 3.38 9.0 1.50 235 000 7 400 50 000 4.0 8.5
Standard 3.75 9.2 1.25 196 000 10 100 60 000 4.0 8.0
Standard 4.25 9.5 2.00 301 000 13 800 70 000 4.0 8.5
Standard
Ultimate		 4.75 11.2
13.3		 2.25 352 000 16 100 75 000
131 250		 6.5 11.0
Standard 5.00 10.2 2.25 352 000 23 300 85 000 6.5 11.0
Standard 6.25 9.7 2.25 868 000 35 000 130 000 6.5 11.0
Standard
Ultimate		 6.50 11.5
13.7		 2.25 868 000 44 000 150 000
262 500		 6.5 11.0
Standard 8.00 10.6 3.00 900 000 86 900 240 000 6.5 11.0
Standard 9.00 11.3 3.00 1 288 000 128 800 270 000 6.0 10.5

Specifications are based on as new condition and are subject to change without notice.

Metric

HJ Type Nominal OD
(mm)		 Length
(m)		 Thru Bore
(mm)		 Tensile Yield
(daN)		 Torsional Limit
(Nm)		 Max Pull During Delay
(daN)		 Free Stroke
(mm)		 Total Stroke
(mm)
Standard 79 2.9 25 88 100 8 900 18 200 180 280
Standard 86 2.7 38 104 500 10 000 22 200 100 220
Standard 95 2.8 32 87 200 13 700 26 700 100 200
Standard 108 2.9 51 133 900 18 700 31 100 100 220
Standard
Ultimate		 121 3.4
4.1		 57 156 600 21 800 33 400
58 400		 170 280
Standard 127 3.1 57 156 600 31 600 37 800 170 280
Standard 159 2.9 57 386 100 47 500 57 800 170 280
Standard
Ultimate		 165 3.5
4.2		 57 386 100 59 700 66 700
116 800		 170 280
Standard 203 3.2 76 400 300 117 800 106 800 170 280
Standard 229 3.4 76 572 900 174 600 120 100 150 270

Specifications are based on as new condition and are subject to change without notice.

Learn more

For tool specifications and further details, contact us via our form below.