| 摘要 |
A well packer is provided which may be permanently anchored in a well casing, but which may be retrieved without damage to either the casing or the packer. The packer may have separate upper and lower mandrel sections, and the upper cone is preferably collapsible but supported in an expanded condition by a support ring on the upper mandrel section when the packer is anchored. To retrieve the packer, the upper mandrel section is lifted from the lower mandrel section to draw the support ring from under the upper cone. When the upper cone collapses about the upper mandrel section, this disengages the upper slips from the casing. Further upward travel of the upper mandrel section draws the lower mandrel section and lower cone from under the lower slips and disengages them from the casing.
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