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Lubricated Fishing Bumper Sub

Lubricated fishing bumper sub is one of the jars which produce jarring force by meansof the energy caused by heavy weight objects when moving down, its inner chamber isfull of hydraulic oil so as to ensure a longer service life. The tool is suitable for deephole and middle deep hole operation. With some advantages: Can produce strong oneway down jarring force, maximum jarring force, continuous down jarring force. Mediumjarringforce; continuous upjar, low-gradejarringforce; canreleasefishingtool; canactasconstantpressuredrilltool,simply structure,easy operation, all these make itwidely usedjarring tool.

Downward is made by means of conversion.Raisingdrill stem shall make bumper jarto bepulleddown at a certain height to produce potential energy. Go on raising drillstem, the drill stem has a strain energy due to spring strain. When drill stem is lowered

suddenly, the energy stored in drill stem the force the drill stem to move downward inacceleration. When bumper sub reaches a closed position, the above energies at thisinstant change into a large downward jarring force.

Many factors influence on jarring force, but key factors as follows:

1、The bigger hanging weight on top drill stem of bumper jar makes a bigger jarring force.

2、The longer the spring extension of drill stem is when raising drill stem, the bigger the jarring force is.

3、The longer the stroke of the bumper jar is, the bigger the jarring force of jar is.

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