KXJ Fishing Bumper Sub
6 month ago
KXJ type bumper jar (hereinafter called as bumper jar )is a mechanical downhole tool. It can make jar repeatedly the stuck drill string to free from stuck point. When stuck drill string can not be released by lifting and jarring, the bumper jar can be rotated to make releasable fishing tool to release fish. When used with mechanical internal cutter, it can provide an expected feeding force to the internal cutter so as to cutting steadily. When used with reversing unit, it can compensate the rising stroke for threads afterreversing.
Energy conversion in jarring operation
Jarring downward is made by means of energy conversion. Raising drill string shall make bumper jar to be pull down at a certain height to produce potential energy. Go on raising drill string, the drill string has a strain energy due to spring strain. When drill stem is lowered suddenly, the energy stored in drill string force the drill string to move downward in acceleration.When bumper jar reach a closed position, the above two energies at this instant change into large downward jarring force.
Main factors having influence on jarring force
The bigger hanging weight on top drill string of bumper jar makes a bigger jarring force; The longer the spring extension of drill string is when raising drill string, the bigger the jarring force is; The longer the stroke of the bumper jar is, the bigger the jarring force of jar is.
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