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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drilling Bits and Downhole Tools 817<br />

A B C D<br />

Figure 4-171. Recommended placement of the Shock Eze. (Courtesy Hughes<br />

Christensen.)<br />

3. J-slots system. The slots will roll out with enough overpull or string weight.<br />

Sets of springs apply lateral pressure holding mandrel in place.<br />

4. Firing racks system. A lateral pressure is applied by adjusting racks. Angle<br />

on firing racks give it a 2:l release factor when overpull or string weight<br />

is applied.

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