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Jar is used in oil&gas industry specially in exploration of hydrocarbons.It is used to free the stuck string thus liquidating down hole problems.Jarring implies delivery of a heavy impact load to release the drilling string.A Drilling Jar is lowered along with Drill-string & it remains downhole as long as the Bit-Life.Fishing Jar is used during Fishing operations.D-Jars are more robustly built to with stand the bottom hole pressures&temperatures.

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