| 摘要 |
A well tool is provided which is adaptable to be moved longitudinally within a well conduit. The tool contains normally retracted slip elements which are manipulated into engagement with the conduit by expander elements. An elastomeric packing element, of known construction, is expandable exteriorly around the well tool and is adapted to selectively seal with the well conduit. Booster means are provided for transmitting the compressive force defined by differential pressure acting across the packing element when the slips are in expanded position against the conduit and the packing element is sealed with the well conduit, such that the packing element is maintained in sealing relationship with the well conduit.
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