Preparation before gaing down the wel: 1.The drilling jar shoukl pass the bench test before gaing into the wdl. 2.The drilng jar is in the realy fring positian before gaing down the wdl. 3. The dilng toal configu ation shallplace the jar in the tension pat above theequilbriunpoint of the dilstring series and bear a tension of at keast fve tons. 4. In arder to inaease the flexibtty of the driling tool and redlue the bending stressof the tool, the lowe part of the jar must be cornected with a bucking jcint
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