| 摘要 |
An improved well packer having upper and lower slips and expanders for permanent anchoring, is further provided with separate upper and lower mandrel sections. After the packer is permanently anchored in a well casing or tubing, the packer may be retrieved by pulling the upper mandrel section to disconnect a segmented nut assembly which couples the upper expander to the lower mandrel section, and which also keeps the upper expander wedged between the upper slips and the upper mandrel section. When the nut is released, the compression loading on the packing is relieved to enable its relaxation, and the setting pressure on the upper and lower slips is also achieved. Further upward travel of the upper mandrel section carries the upper slip out of engagement with the well casing, and thereafter draws the lower cone upward and out from between the lower slip and the lower mandrel section.
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