Wireline Spring Jar Wireline Tool String

I. introduction 

The spring jar is one of the wirline basic tools used for wireline fishing operation in the

gas well. The wireline spring jar is designed to provide upward jarring during heavy

duty fishing operation. The wireline spring jar works with shift ingesting principle and

is able to guarantee the faultless operation with least maintenace, so that the wireline

spring jar can provide reliable upward jarring force.

Ⅱ.Structure characteristics

The wireline spring jar consists of fishing neck, sleeve, jar stem, pup joint, locking

piece, slip, spring, extension rod, spacer, connecting sleeve, pressing sleeve, adjusting

screw, lower sub, disc spring, etc..

When the jar is closed, the slip on the jar stem will stretch and clamp on the extension rod

under the function of spring. When lifting, the jar stem will drive the slip to pull the extension

rod and squeeze the disc spring to reserve energy. When the jar stem runs for some stroke,

the slip will be squeezed by the pup joint and disconnect with the extension rod. Then the

energy of disc spring will release immediately to finish the jarring effect.

III. General Technical Parameters 

Note: More customized parts are available upon request.