The Hydraulic Up/Down Jars use a piston (metering device) and oil to create a time delay. This time delay allows energy to be stored in stretched tubing. Once the energy is stored, the jar piston bypasses (step), creating a hammer-and-anvil effect that imparts an impact load to the end of the tool assembly. As the jar is pulled in tension, a piston moves through a restricted bore containing oil. This process enables the system to store energy and the continued upward pull moves the piston over the step, which releases the stored energy and allows the mass to rapidly accelerate to the top of its stroke. This process creates an impact force that can be twice as great as the tension that can be pulled on the tubing alone. The force supplied depends upon the force applied at the tool. The Hydraulic Up/ Down Jars can be supplied either up acting, down acting or bi-directional.

Design Features/Benefits:

  • Jar is shorter than most hydraulic jars
  • Higher impact capability, it can hit harder than any other jar of the same size
  • Maximum operating temperature 500°F
  • Large bore for drop ball
  • Jar has high tensile strength for higher impact service capability
  • Jar is hydrostatic pressure balanced
  • Jar can be run in compression or tension

Max OD (in)Min ID (in)Max Overpull (lbs)Max Overpush (lbs)Torsional Yield Strength (lbs)Total Stroke (in)ThreadPart Number
2.8751.00034,00020,0002,700122 3/8”PAC2194287922
3.1251.25045,00035,0003,100122 3/8”REG2194312922