Mechanical jar:

If the fish can e freed by an upward blow, the mechanical jar can be very effective.

Also called a hydraulic jar.

Terms Related to Mechanical jar

• Bumper sub

  A percussion tool run on a fishing string to jar downward or upward on a stuck fish to knock it free. The bumper sub body ...

• Hold-down

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• Bumper jar

  A device made up in the drill string that, when actuated, delivers a heavy downward blow to the string. A bumper jar has a hollow ...

• Setting tool

  A tool used to set drillable or permanent tools, such as packers, retainers, plugs; can be mechanical, electric, or hydraulic.

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• Mechanical rig

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• Safety joint

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