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All ISI wireline jars employ patented or patent-pending technology
which utilizes stored kinetic energy to maximize impact ratios. When
line tension surpasses a preset load limit, indicating a stuck condition,
the tool activates and releases stored energy to deliver the initial
impact. Usually, this impact -- intensified by the multiplying effect
of the jar's Weight Forward™ design, and assisted by the elasticity
of the wireline cable -- frees the tool string. If not, the operator
simply decreases line tension to relatch the tool instantly under
its own weight. An Impact Selector impact tool can be repeatedly reset
in seconds for an unlimited number of activation cycles until the
stuck string works free.
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