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The Hydraulic Jar i is included as part of a toolstring to help remove stuck tools. It is a straight-pull operated jar with a closed hydraulic system and a unique balance piston used to equalize oil pressure with tubing pressure.
The hydraulic jar is designed for easy control of the jarring action by the operator. The time delay impact control is allowed for by use of Flow Restrictors between the upper and lower oil chambers. Fluid flow is restricted only in the upward pull direction so the jar is easily reset for subsequent jars.
• Design of the hydraulic system ensures long life with little maintenance.
• Rig time is reduced.
• Jar can be re-cocked rapidly.
• Jar time delay is adjustable.
• Amount of pull to trip the jar can be varied within the limits of the time-delay system
Mud, Crude Oil,
Natural gas with
H2S and acid