The hydraulic jar(Bigjohn Jar) is a safety tool.
The hydraulic jar is included as part of tool string to help remove stuck tools.
The jar helps free a stuck tool or tool string by resisting a pull on the workstring, when the workstring is stretched by the pull, tension in the jar is released and an upward impact is delivered to the stuck tool.
The pulling strength of 5" Hydraulic Jar is 222.2kN.
Features and Benefits
• 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.
